Molecules that bind prostate specific membrane antigen (PSMA) Field of the Invention The invention relates to prostate specific membrane antigen (PSMA) binding molecules, and the use of such binding molecules in the treatment of disease.

Introduction Prostate cancer is the most commonly diagnosed non-skin-related malignancy in males in developed countries. It is estimated that one in six males will be diagnosed with prostate cancer.

Current treatments for prostate cancer include surgery, radiation, and adjuvant hormonal therapy. Although these therapies are relatively effective in the early stages of disease, the majority of patients initially diagnosed with localized prostate cancer ultimately relapse.

Whilst chemotherapy is one of the most widely used approaches in combating advanced prostate cancer, its therapeutic efficacy is usually insufficient due to lack of specificity and associated toxicity. Lack of targeted delivery to prostate cancer cells is one of the primary obstacles in achieving feasible therapeutic effect. Consequently, there remains a critical need for strategies to increase the selectivity of anti-prostate cancer agents (Barve et al., J

Control Release. 2014 August 10; 0: 1 18-132).

The diagnosis of prostate cancer has greatly improved following the use of serum-based markers such as the prostate specific antigen (PSA). In addition, prostate tumour-associated antigens offer targets for tumour imaging, diagnosis, and targeted therapies. The prostate specific membrane antigen (PSMA), a prostate tumour associated marker, is such a target.

PSMA is a 750-residue type II transmembrane glycoprotein highly restricted to prostate secretory epithelial cell membranes. It is highly expressed in prostate cancer cells and in nonprostatic solid tumor neovasculature and expressed at lower levels in other tissues, including healthy prostate, kidney, liver, small intestine, and brain. PSMA expression increases with prostate disease progression and metastasis and its expression level has thus been correlated with tumour aggressiveness. Various immunohistological studies have demonstrated increased PSMA levels in virtually all cases of prostatic carcinoma compared to those levels in benign prostate epithelial cells. Intense PSMA staining is found in all stages of the disease, including prostatic intraepithelial neoplasia, late stage androgen-independent prostate cancer and secondary prostate tumours localized to lymph nodes, bone, soft tissue, and lungs. PSMA is thus widely used as a biomarker for prostate cancer cells.

PSMA has a 3-part structure: a 19-amino-acid internal portion, a 24-amino-acid transmembrane portion, and a 707-amino-acid external portion. It forms a noncovalent homodimer that possesses glutamate carboxypeptidase activity based on its ability to process the neuropeptide N-acetylaspartylglutamate and glutamate-conjugated folate derivatives. PSMA is rapidly and efficiently internalized by an endocytic pathway and rapidly recycles back to the membrane.

Antibody-based therapeutics have emerged as important components of therapies for an increasing number of human malignancies in such fields as oncology, inflammatory and infectious diseases. In most cases, the basis of the therapeutic function is the high degree of specificity and affinity the antibody-based drug has for its target antigen. Arming monoclonal antibodies (mAbs) with drugs, toxins, or radionuclides is yet another strategy by which mAbs may induce a therapeutic effect. By combining the targeting specificity of an antibody with the tumour killing power of toxic effector molecules, immunoconjugates permit sensitive discrimination between target and normal tissue thereby resulting in fewer side effects than most conventional chemotherapeutic drugs.

Due to their size and other physical properties, however, mAbs have to be administered either intravenously (iv) or subcutaneously (sc) and therefore have a high systemic exposure. Thus, their route of delivery can often be suboptimal, resulting either in antibody binding to target antigen at non-disease locations (potentially compromising the healthy function of normal, non-disease tissue) or resulting in suboptimal PK/PD characteristics. Either outcome may result in a loss of efficacy and/or a compromised safety profile by virtue of the suboptimal route of administration.

The first PSMA-specific mAb reported, murine mAb 7E1 1 , was subsequently developed and commercialized as a diagnostic agent for tumour imaging (ProstaScint, Cytogen, Princeton, N.J.). However, this antibody recognizes an intracellular epitope of PSMA exposed upon cell death which limits its usefulness as an imaging agent for the detection of PSMA. More recently, mAbs such as J591 that recognize the extracellular portion of PSMA have been identified.

The aim of the present invention is to address the need of alternative antibody-based treatments for use in the treatment of prostate cancer. Summary of the invention

The invention relates to binding molecules that bind human PSMA. In particular, the invention relates to multivalent/multiparatopic binding molecules that bind human PSMA comprising two or more single human heavy chain variable (V _H ) domain antibodies. In particular, the binding is to human PSMA in its native form. In preferred embodiments, the single V _H domain is generated from a heavy chain only antibody produced in a transgenic rodent expressing human V gene loci and immunised with a PSMA antigen. Single domain antibodies used in the binding molecules of the invention bind a target in monovalent form. Single domain antibodies are smaller than conventional monoclonal antibody formats and the inventors have shown that such molecules facilitate high levels of specific tumor targeting, fast penetration and high accumulation in the tumor compared to a monoclonal antibody benchmark. As shown herein, the binding molecules have improved properties compared to monovalent single domain antibodies, in particular they demonstrate improved cell internalisation. They also show different properties compared to a monoclonal benchmark antibody. The inventors have also shown that the single domain antibodies bind human PSMA with high affinity, are very stable and expressed to high level. Furthermore, single V _H domain antibodies of the invention are less immunogenic than murine antibodies and no humanization is required. These properties make the compounds of the invention particularly useful in different formats, for example in multivalent/multiparatopic formats and conjugated to a toxin or half-life extending moiety. The compounds are thus useful in treating disease, in particular cancer. In one aspect, the invention provides an immunoconjugate comprising more than one single V _H domain antibody described herein. Aspects of the invention are further summarised below.

In one aspect, the invention thus relates to a binding molecule comprising a first single human heavy chain variable immunoglobulin (V _H ) domain antibody capable of binding human PSMA and a second single V _H domain antibody capable of binding human PSMA.

In one embodiment, said first V _H domain and said second V _H domain bind to the same epitope on human PSMA.

In one embodiment, said first single V _H domain antibody binds to a first epitope on PSMA and said second single V _H domain antibody binds to a second epitope on PSMA wherein said first and said second epitope are not identical.

The invention also relates to a binding molecule according to a preceding claim wherein said first or second single V _H domain antibody comprises a CDR3 sequence comprising SEQ ID NO. 3 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto. The invention also relates to a binding molecule wherein said first or second single V _H domain antibody comprises a CDR3 sequence comprising SEQ ID NO. 83 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 183 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 279 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 295 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 303 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 331 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 363 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 367 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first and/or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 371 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first and/or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 375 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 379 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 383 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto. The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 387 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule wherein said first or second V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 391 or a sequence with at least 70%, at least 80%, at least 90% or at least 95% homology thereto.

The invention also relates to a binding molecule according to claim 3 in which a) the first single V _H domain antibody is selected from a single V _H domain antibody of family 2, 3, 4, 7, 9, 10, 11 or 14 and in which b) the second single _H domain antibody is selected from family 1 , 5, 6, 12 or 13.

The invention also relates to a binding molecule in which a) the first single V _H domain antibody is selected from a single V _H domain antibody of family 2, in which b) the second single V _H domain antibody is selected from a single V _H domain antibody of family 1. Said first single V _H domain antibody is located either C or N terminally so that either direction is within the scope of the invention.

The invention also relates to a binding molecule in which a) the first V _H domain can compete with a Humabody® comprising SEQ ID NO: 4 for binding to PSMA and/or can cross-block the binding of a Humabody® comprising SEQ ID NO: 4 to PSMA and in which b) the second V _H domain can compete with a Humabody® comprising SEQ ID NO: 76 for binding to PSMA and/or can cross-block the binding of a Humabody® comprising SEQ ID NO:76 to PSMA.

In another aspect, the invention relates to a pharmaceutical composition comprising a binding molecule described herein and a pharmaceutical carrier.

In another aspect, the invention relates to a method for treating prostate cancer or a prostatic disorder comprising administering a therapeutical ly-effective amount of a binding molecule or a pharmaceutical composition described herein.

In another aspect, the invention relates to a binding molecule or a pharmaceutical composition described herein for use as medicament.

In another aspect, the invention relates to a binding molecule or a pharmaceutical composition described herein for use in the treatment of prostate cancer or a prostatic disorder.

In another aspect, the invention relates to the use of a binding molecule or a pharmaceutical composition described herein in the manufacture of a medicament for the treatment of prostate cancer or a prostatic disorder.

In another aspect, the invention relates to an in vivo or in vitro method for reducing human PSMA activity comprising contacting human PSMA with a binding molecule described herein. In another aspect, the invention relates to a method for determining the presence of PSMA in a test sample by an immunoassay comprising contacting said sample with a binding molecule described herein and at least one detectable label.

In another aspect, the invention relates to a nucleic acid construct comprising a nucleic acid according described herein.

In another aspect, the invention relates to a host cell comprising a nucleic acid or a construct described herein.

In another aspect, the invention relates to a method for producing a binding molecule described herein comprising expressing a nucleic acid encoding said binding molecule in a host cell and isolating the binding molecule from the host cell culture.

In another aspect, the invention relates to a kit comprising a binding molecule or a pharmaceutical composition described herein.

In another aspect, the invention relates to a biparatopic, bivalent or multispecific binding molecule comprising one or more single domain antibody described herein.

Drawings

Figure 1. Family 1 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 1. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 2. Family 2 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 2. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 3. Family 3 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 3. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 4. Family 4 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 4. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 5. Family 5 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 5. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 6. Family 6 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 6. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 7. Family 7 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 7. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold. Figure 8. Family 8 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 8. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 9. Family 9 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 9. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 10. Family 10 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 10. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 11. Family 1 1 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 1 1. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 12. Family 12 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 12. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 13. Family 13 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 13. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 14. Family 14 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 14. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 15. Family 15 sequences. This Figure shows the full length V _H sequence for single domain antibodies in family 15. Framework (FR) and complementarity determining regions (CDR) are labelled. CDR1 , CDR2 and CDR3 are highlighted in bold.

Figure 16. Binding of purified anti-PSMA V _H in FMAT Mirrorball Assay. 16a ·1.1 , -3.1 , A2.10, T2.1 , 16b · 2.1 , ▲ 2.13, T2.17 02.15, o2.12 Δ2.22 16c single domain antibodies tested as shown by symbols from top to bottom · 1.8, ^■ 1.10, A 1.11 , T 1.12, 1.13, o1.14, 1.16, Δ 1.17, 1.18 d) biparatopic binding molecules tested as shown by symbols from top to bottom: L=(G4S) ₆ 1.1-L-2.1 ; 1.16-L-2.1 ; 1.11-L-2.1 , 1.18-L-2.1 , 1.17-2.1 , 1.1-2.17, 1.16-L- 2.17, 1.1 1-L-2.17, 1.18-L-2.17, 1.17-L-2.17; e) 1.1-L-2.15, 1.16-L-2.15, 1.1 1-L-2.15, 1.18-L- 2.15, 1.17-L-2.15, 1.1-L-2.22, 1.16-L-2.22, 1.1 1-L-2.22, 1.1 1-L-2.22, 1.18-L-2.22, 1.17-L- L2.22

Figure 17. pHrodo® Green internalisation of purified anti-PSMA single domain antibodies. Single domain antibodies used (symbols in legend from top to bottom): 2.20, 12.1 , 3.1 , 3.2, 4.1 , 5.1 , 9.1 , 14.1 , 10.1 , 7.1.

Figure 18. Killing of cynoPSMA and human PSMA CHO with anti-PSMA single domain antibodies A. 2.1 B. 1.1. Figure 19. Killing of LNCap with anti-PSMA single domain antibodies. Single domain antibodies used (symbols in legend from top to bottom): 1.1 , 2.1 , 7.1 , 3.1 , 12.1 , 4.1.

Figure 20. Localisation studies using V _H 2.1-HIS. V _H staining is localized mainly on the cell membrane (indicated by the large arrow), but some internalization can also be observed (thin arrow) at both 4°C and 37°C in the form of a single central cluster localizing with both LAMP- 1 (b) and EEA-1 (a).

Figure 21. Localisation studies using bivalent V _H construct 2.1-6GS-2.1-HIS. At 4°C, V _H staining is localized mainly on the cell membrane (large arrows). After 2hrs at 37°C the membrane staining appears more punctuated (large arrow), and internalization is shown by the presence of small V _H clusters inside the cell localizing with both LAMP-1 (a) and EEA-1 (b) (thin arrows).

Figure 22. Localisation studies using V _H 1.1-HIS. V _H staining is localized mainly on the cell membrane (indicated by the large arrow), but some internalization is present (thin arrow) at both 4 °C and 37°C in the form of a single central cluster localizing with both LAMP-1 (b) and EEA-1 (a).

Figure 23. Localisation studies using biparatopic V _H construct 2.1-6GS-1.1-HIS. At 4 °C, V _H staining is localized mainly on the cell membrane (large arrows). After 2hrs at 37°C the membrane staining has almost disappeared (large arrow), and V _H is internalized as shown by the punctuated staining inside the cell localizing with both LAMP-1 (b) and EEA-1 (a) (thin arrows).

Figure 24. Localisation studies using benchmark anti-PSMA IgG. At 4°C, V _H staining is localized mainly on the cell membrane (large arrows). After 2hrs at 37°C, the membrane staining is thinner (large arrow), and most of the V _H is internalized as shown by the presence of clusters inside the cell localizing with both LAMP-1 (b) and EEA-1 (a) (thin arrows).

Figure 25. Localisation studies using CHO cells expressing human PSMA using 1.1-6GS- 2.1-HIS (top panel) and 2.1-6GS-1.1-HIS (bottom panel).

Figure 26. shows in vitro cytotoxicity of monomeric MMAE-conjugated V _H (A and B), bivalent V _H (C and D) and biparatopic VH (E and F) on human cells stably expressing human PSMA protein and matched parental cells (PSMA negative) at a 48 hour incubation time point.

Figure 27. shows in vitro cytotoxicity of MMAE-conjugated V _H on human cells stably expressing human PSMA protein at a 72 hour incubation time point.

Figure 28. shows the HiPEG™ val-cit-PAB-MMAE reagent (MW = 2805 g/mol) used to prepare Humabody™ drug conjugates (HDCs).

Figure 29. shows the Maleimidocaproyl-valine-citrulline-p-aminobenzoyloxycarbonyl - monomethyl auristatin E (mc-val-cit-PAB-MMAE) conjugation reagent (MW = 1317 g/mol) used to produce the Pro_006 control antibody drug conjugates (ADC). Figure 30. A & B show IC ₅₀ values in the PSMA-DU 145 cytotoxicity assay (72h) for: Control ADC mAb-MMAE (■), 2.1 6G4S-1.1-MMAE biparatopic (A), 2.1 6GS-1.1-MMAE-HLE half- life extended biparatopic(T), HEL4-MMAE Monovalent (·) and HEL4-HLE-MMAE Monovalent half-life extended (I), for (A) DU145 cells expressing PSMA and (B) DU145 parental cells that have not been modified to express PSMA.

Detailed description

The present invention will now be further described. In the following passages, different aspects of the invention are defined in more detail. Each aspect so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.

Generally, nomenclatures used in connection with, and techniques of, cell and tissue culture, pathology, oncology, molecular biology, immunology, microbiology, genetics and protein and nucleic acid chemistry and hybridization described herein are those well-known and commonly used in the art. The methods and techniques of the present disclosure are generally performed according to conventional methods well-known in the art and as described in various general and more specific references that are cited and discussed throughout the present specification unless otherwise indicated. See, e.g., Sambrook et al., Molecular Cloning: A Laboratory Manual (2d ed., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y. (1989)). Enzymatic reactions and purification techniques are performed according to manufacturer's specifications, as commonly accomplished in the art or as described herein. The nomenclatures used in connection with, and the laboratory procedures and techniques of, analytical chemistry, synthetic organic chemistry, and medicinal and pharmaceutical chemistry described herein are those well-known and commonly used in the art. Standard techniques are used for chemical syntheses, chemical analyses, pharmaceutical preparation, formulation, and delivery, and treatment of patients. The invention provides isolated formatted binding molecules that bind to human PSMA, in particular those comprising at least two single V _H domain antibodies that bind human PSMA, pharmaceutical compositions comprising such binding molecules, as well as isolated nucleic acid constructs, recombinant expression vectors and isolated host cells for making such binding proteins and fragments. Also provided are methods of using the binding proteins disclosed herein to detect human PSMA, to inhibit human PSMA either in vitro or in vivo, and methods of treating disease. One aspect of the invention provides isolated human anti- human PSMA binding molecules, specifically those comprising, or consisting of, more than one single V _H domain antibody that binds to human PSMA with high affinity and a slow off rate.

The PSMA binding molecules of the invention bind to wild type human PSMA (accession NO. Q04609). The sequence for the monomer is shown below (SEQ ID No. 529).

1 MWNLLHETDS AVATARRPRW LCAGALVLAG GFFLLGFLFG WFIKSSNEAT NITPKHNMKA

61 FLDELKAENI KKFLYNFTQI PHLAGTEQNF QLAKQIQSQW KEFGLDSVEL AHYDVLLSYP

121 NKTHPNYISI INEDGNEIFN TSLFEPPPPG YENVSDIVPP FSAFSPQGMP EGDLVYVNYA

181 RTEDFFKLER DMKINCSGKI VIARYGKVFR GNKVKNAQLA GAKGVILYSD PADYFAPGVK

241 SYPDGWNLPG GGVQRGNILN LNGAGDPLTP GYPANEYAYR RGIAEAVGLP SIPVHPIGY

301 DAQKLLEKMG GSAPPDSSWR GSLKVPYNVG PGFTGNFSTQ KVKMHIHSTN EVTRIYNVIG

361 TLRGAVEPDR YVILGGHRDS WVFGGIDPQS GAAVVHEIVR SFGTLKKEGW RPRRTILFAS

421 WDAEEFGLLG STEWAEENSR LLQERGVAYI NADSSIEGNY TLRVDCTPLM YSLVHNLTKE

481 LKSPDEGFEG KSLYESWTKK SPSPEFSGMP RISKLGSGND FEVFFQRLGI ASGRARYTKN

541 WETNKFSGYP LYHSVYETYE LVEKFYDPMF KYHLTVAQVR GGMVFELANS IVLPFDCRDY

601 AVVLRKYADK IYSISMKHPQ EMKTYSVSFD SLFSAVKNFT EIASKFSERL QDFDKSNPIV

661 LRMMNDQLMF LERAFIDPLG LPDRPFYRHV IYAPSSHNKY AGESFPGIYD ALFDIESKVD

721 PSKAWGEVKR QIYVAAFTVQ AAAETLSEVA

In one embodiment, the PSMA binding molecules of the invention bind to wild type human PSMA and/or cyno PSMA. The terms "PSMA binding molecule", "PSMA binding protein" "anti-PSMA single domain antibody" or "anti-PSMA antibody" as used herein all refer to a molecule capable of binding to the human PSMA antigen. The term "PSMA binding molecule" includes a PSMA binding protein. The binding reaction may be shown by standard methods (qualitative assays) including, for example, a binding assay, competition assay or a bioassay for determining the inhibition of PSMA binding to its receptor or any kind of binding assays, with reference to a negative control test in which an antibody of unrelated specificity. Suitable assays are shown in the examples.

An antibody or binding molecule of the invention, including a single domain antibody and multivalent or multispecific binding agent described herein, "which binds" or is "capable of binding" an antigen of interest, e.g. PSMA, is one that binds the PSMA antigen with sufficient affinity such that it is useful in therapy in targeting a cell or tissue expressing the antigen.

Binding molecules of the invention bind specifically to human PSMA. In other words, binding to the PSMA antigen is measurably different from a non-specific interaction. Preferably, the single domain antibodies used in the binding molecules of the invention bind to human PSMA and also bind to cyno PSMA. The term "specific binding" or "specifically binds to" or is "specific for" a particular polypeptide or an epitope on a particular polypeptide target as used herein can be exhibited, for example, by a molecule having a KD for the target of at least about 10 ^"4 M, alternatively at least about 10 ^"5 M, alternatively at least about 10 ^"6 M, alternatively at least about 10 ^"7 M, alternatively at least about 10 ^"8 M, alternatively at least about 10 ^"9 M, alternatively at least about 10 ^"10 M, alternatively at least about 10 ^"11 M, alternatively at least about 10 ^"12 M, or greater. In one embodiment, the term "specific binding" refers to binding where a molecule binds to a particular polypeptide or epitope on a particular polypeptide without substantially binding to any other polypeptide or polypeptide epitope.

In one aspect, the invention relates to a binding molecule comprising a first single V _H domain antibody capable of binding human PSMA and a second moiety capable of binding human PSMA. The single V _H domain antibody and the second moiety are preferably covalently linked, for example via a peptide linker. The second moiety may be an antibody, a heavy chain only antibody (HCAb), a fragment thereof or an antibody mimetic.

In one aspect, the invention relates to a binding molecule comprising a first single V _H domain antibody capable of binding human PSMA and a second single V _H domain antibody capable of binding human PSMA. The single V _H domain antibodies are preferably covalently linked, for example via a peptide linker.

In one aspect, the invention relates to a binding molecule comprising a HCAb comprising a V _H domain as described herein capable of binding human PSMA and a second HCAb capable of binding human PSMA. The HCAbs are preferably covalently linked, for example via a peptide linker.

In one embodiment, the heavy chain only antibody comprises human variable regions. In one embodiment, the HCAb lacks the C _H 1 domain. In one embodiment, the HCAb comprises murine C regions. In one embodiment, the binding molecule comprises at least one single V _H domain antibody.

In one aspect, the invention relates to multivalent/multiparatopic isolated binding molecules capable of binding to human PSMA comprising a heavy chain variable immunoglobulin domain (V _H ) comprising a CDR3 sequence as shown in any of Figures 1 to 15 with reference to Tables 1 to 15 or a sequence with at least 60%, 70%, 80%, 90%, 95% or more sequence identity thereto. In one embodiment, the binding molecule comprises a set of CDR1 , 2 and 3 sequences selected from the sets of CDR1 , 2 and 3 sequences as shown for the any of the clones of any of Figures 1 to 15 with reference to Tables 1 to 15. In one embodiment, the binding molecule comprises a V _H domain with a set of CDR1 , 2 and 3 sequences selected from the sets of CDR1 , 2 and 3 sequences as shown for the any of the clones of any of Figures 1 to 15 with reference to Tables 1 to 15. The binding molecules of the invention comprise more than one single V _H domain antibody.

The terms "single domain antibody, variable single domain or immunoglobulin single variable domain (ISV)" are all well known in the art and describe the single variable fragment of an antibody that binds to a target antigen. These terms are used interchangeably herein. As explained below, preferred embodiments of the various aspects of the invention relate to single heavy chain variable domain antibodies/immunoglobulin heavy chain single variable domains which bind a PSMA antigen in the absence of light chain. Fragments of the single domain antibody, variable single domain or immunoglobulin single variable domain that bind to human PSMA are also within the scope of the invention. Single heavy chain variable domain antibodies (V _H ) do not comprise an immunoglobulin light chain. Human heavy chain single variable (V _H ) domain antibodies are particularly preferred. Human heavy chain single variable V _H are commonly abbreviated as V _H domains. Single V _H domain antibodies are also termed Humabody® herein. Humabody® is a registered trademark of Crescendo Biologies Ltd.

Thus, in some preferred embodiments, the isolated binding agents/molecules of the invention comprise at least two single V _H domain antibodies wherein said domain is preferably a human heavy chain variable domain. Thus, in one aspect, the binding agents of the invention comprise at least two human immunoglobulin single variable heavy chain domain; they are devoid of V _L domains.

Each single V _H domain antibody comprises three CDRs and four FRs, arranged from amino- terminus to carboxy-terminus in the following order: FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4. Thus, in one embodiment of the invention, the domain is a human variable heavy chain (V _H ) domain with the following formula FR1-CDR1-FR2-CDR2-FR3-CDR3-FR4.

The term "isolated" single domain antibody refers to a single domain antibody that is substantially free of other single domain antibodies, antibodies or antibody fragments having different antigenic specificities. Moreover, an isolated single domain antibody may be substantially free of other cellular material and/or chemicals.

In one embodiment, said first or second single V _H domain antibody comprises a CDR3 sequence as shown in any of Figures 1 to 15 with reference to Tables 1 to 15 or a sequence with at least 60%, 70%, 80%, 90%, 95% or more sequence identity thereto. In one embodiment, said first or second single V _H domain comprises a set of CDR1 , 2 and 3 sequences selected from the sets of CDR1 , 2 and 3 sequences as shown for the any of the clones of any of Figures 1 to 15 with reference to Tables 1 to 15. In one embodiment, the first or second single V _H domain antibody comprises a set of CDR1 , 2 and 3 sequences selected from the sets of CDR1 , 2 and 3 sequences as shown for the any of the clones of any of Figures 1 to 15 and Tables 1 to 15. In one embodiment, the binding molecule is a heavy- chain-only antibody (HCAb).

In one embodiment, the first or second single V _H domain antibody comprises a CDR3 sequence as shown in any of Figures 1 to 15 and Tables 1 to 15 or a sequence with at least 60%, 70%, 80%, 90%, 95% or more sequence identity thereto.

In one embodiment, the first or second single V _H domain antibody comprises a set of CDRsl , 2 and 3 sequences selected from the sets of CDR1 , 2 and 3 sequences as shown for any of the sdAbs of any of Figures 1 to 15 and 1 to 15. In another embodiment, the first or second single V _H domain antibody is selected from any of the following single V _H domain antibodies

I .1 to 1.20, 2.1 to 2.25, 3.1 to 3.24, 4.1 to 4.4, 5.1-5.2, 6.1 to 6.7, 7.1 to 7.8, 8.1 , 9.1 , 10.1 ,

I I .1 , 12.1 , 13.1 , 14.1 or 15.1.

In one embodiment, said sequence homology or identity is at least 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%.

"Homology" generally refers to the percentage of amino acid residues in the candidate sequence that are identical with the residues of the polypeptide with which it is compared, after aligning the sequences and in some embodiments after introducing gaps, if necessary, to achieve the maximum percent homology, and not considering any conservative substitutions as part of the sequence identity. Thus, the percent homology between two amino acid sequences is equivalent to the percent identity between the two sequences. Neither N- or C-terminal extensions, tags or insertions shall be construed as reducing identity or homology. Methods and computer programs for the alignment are well known.

The term "antibody", broadly refers to any immunoglobulin (Ig) molecule, or antigen binding portion thereof, comprised of four polypeptide chains, two heavy (H) chains and two light (L) chains, or any functional fragment, mutant, variant, or derivation thereof, which retains the essential epitope binding features of an Ig molecule. Such mutant, variant, or derivative antibody formats are known in the art. In a full-length antibody, each heavy chain is comprised of a heavy chain variable region (abbreviated herein as HCVR or V _H ) and a heavy chain constant region. The heavy chain constant region is comprised of three domains, C _H 1 , C _H 2 and C _H 3. Each light chain is comprised of a light chain variable region (abbreviated herein as LCVR or V _L ) and a light chain constant region. The light chain constant region is comprised of one domain, CL. The V _H and V _L regions can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDR), interspersed with regions that are more conserved, termed framework regions (FR). Each V _H and V _L is composed of three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1 , CDR1 , FR2, CDR2, FR3, CDR3, FR4. Immunoglobulin molecules can be of any type (e.g., IgG, IgE, IgM , IgD, IgA and IgY), class (e.g., IgG 1 , lgG2, IgG 3, lgG4, IgAI and lgA2) or subclass.

An antibody fragment is a portion of an antibody, for example as F(ab') ₂ , Fab, Fv, sFv and the like. Functional fragments of a full length antibody retain the target specificity of a full length antibody. Recombinant functional antibody fragments, such as Fab (Fragment, antibody), scFv (single chain variable chain fragments) and single domain antibodies (dAbs) have therefore been used to develop therapeutics as an alternative to therapeutics based on mAbs. scFv fragments (~25kDa) consist of the two variable domains, V _H and V _L . Naturally, V _H and V|_ domain are non-covalently associated via hydrophobic interaction and tend to dissociate. However, stable fragments can be engineered by linking the domains with a hydrophilic flexible linker to create a single chain Fv (scFv). The smallest antigen binding fragment is the single variable fragment, namely the V _H or V _L domain. Binding to a light chain/heavy chain partner respectively is not required for target binding. Such fragments are used in single domain antibodies. A single domain antibody (-12 to 15 kDa) therefore has either the V _H or V _L domain.

Thus, in some preferred embodiments of the invention, the binding molecule does not comprise a light chain. In some embodiments, the binding molecule does not comprise heavy chain domains C _H 2 and C _H 3. In some embodiments, the binding molecule does not comprise a hinge region and heavy chain domains C _H 2 and C _H 3. In some embodiments, the binding molecule does not comprise heavy chain domains C _H 1 , C _H 2, and C _H 3. In some embodiments the binding molecule does not comprise heavy chain domain C _H 1 , a hinge region heavy chain domain C _H 2 and heavy chain domain C _H 3. In some embodiments the binding molecule does not comprise a light chain, a heavy chain domain C _H 1 , a hinge region heavy chain domain C _H 2 and heavy chain domain C _H 3. Each V _H domain comprises three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1 , CDR1 , FR2, CDR2, FR3, CDR3, FR4. Modifications to the V _H framework may be made to improve binding properties. For example, the V _H domain may comprise C or N-terminal extensions. In one embodiment, the V _H domain comprises C-terminal extensions of from 1 to 10, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 additional amino acids. In one embodiment, the V _H domain comprises C-terminal extensions of from 1 to 12 amino acid residues, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 additional amino acids of the C _H 1 domain. In one embodiment, said extension comprises at least 1 alanine residue, for example a single alanine residue, a pair of alanine residues or a triplet of alanine residues. Such extended V _H domains are within the scope of the invention. Also within the scope of the invention are binding molecules that comprise V _H domains that comprise additional C or N-terminal residues, for example linker residues and / or His tags, e.g., hexa-His (HHHHHH, SEQ ID No. 530) or myc tags. Additional residues of the vector may also be present, for example in addition to tags. Binding molecules used may have the additional residues LEGGGSEQKLISEEDLNHHHHHHGS (SEQ ID No. 531).

According to the various aspects and embodiments of the invention, the variable domain of the single domain antibodies is preferably a human variable domain (V _H ). As used herein, a human V _H domain includes a fully human or substantially fully human V _H domain. As used herein, the term human V _H domain also includes V _H domains that are isolated from heavy chain only antibodies made by transgenic mice expressing fully human immunoglobulin heavy chain loci, in particular in response to an immunisation with an antigen of interest, for example as described in WO2016/062990 and in the examples. In one embodiment, a human V _H domain can also include a V _H domain that is derived from or based on a human V _H domain amino acid or nucleic acid sequence encoding such V _H domain. Thus, the term includes variable heavy chain regions derived from or encoded by human germline immunoglobulin sequences. A substantially human V _H domain or V _H domain that is derived from or based on a human V _H domain may include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced in vitro, e.g. by random or site-specific mutagenesis, or introduced by somatic mutation in vivo). The term "human V _H domain" therefore also includes a substantially human V _H domain wherein one or more amino acid residue has been modified. For example, a substantially human V _H domain the V _H domain may include up to 10, for example 1 , 2, 3, 4 or 5 amino acid modifications compared to a fully human sequence. However, the term "human V _H domain" or "substantially human V _H domain", as used herein, is not intended to include antibodies in which CDR sequences derived from the germline of another mammalian species, such as a mouse, have been grafted onto human framework sequences. Preferably, the term "human V _H domain", as used herein, is also not intended to include camelized V _H domains, that is human V _H domains that have been specifically modified, for example in vitro by conventional mutagenesis methods to select predetermined positions in the V _H domains sequence and introduce one or more point mutation at the predetermined position to change one or more predetermined residue to a specific residue that can be found in a camelid V _H H domain.

As used herein, the term V _H or "variable domain" refers to immunoglobulin variable domains defined by Kabat et al., Sequences of Immunological Interest, 5 ^th ed., U.S. Dept. Health & Human Services, Washington, D.C. (1991). The numbering and positioning of CDR amino acid residues within the variable domains is in accordance with the well-known Kabat numbering convention.

More particularly, the invention provides a single V _H domain antibody or a binding molecule single V _H domain antibody wherein said single V _H domain antibody binds to human PSMA with an affinity, a Kon-rate, a Koff rate, KD and/or KA, EC50 and IC50 values as further described herein, in particular in the examples. Assays suitable for measuring these values are also shown in the examples. A binding molecule of the invention comprises or consists of an amino acid sequence and preferred sequences and/or parts thereof, such as CDRs, as defined herein.

The term "CDR" refers to the complementarity-determining region within antibody variable sequences. There are three CDRs in each of the variable regions of the heavy chain and the light chain, which are designated CDR1 , CDR2 and CDR3, for each of the variable regions. The term "CDR set" refers to a group of three CDRs that occur in a single variable region capable of binding the antigen. The exact boundaries of these CDRs have been defined differently according to different systems. The system described by Kabat is used herein. The terms "Kabat numbering", "Kabat definitions" and "Kabat labeling" are used interchangeably herein. These terms, which are recognized in the art, refer to a system of numbering amino acid residues which are more variable (i.e., hypervariable) than other amino acid residues in the heavy and light chain variable regions of an antibody, or an antigen binding portion thereof (Kabat et al., (1971) Ann. NY Acad. Sci. 190:382-391 and Kabat, et al., (1991) Sequences of Proteins of Immunological Interest, Fifth Edition, U.S. Department of Health and Human Services, NIH Publication No. 91-3242). The binding molecule may be multivalent, for example bivalent, or multiparatopic, for example biparatopic. Thus, the binding molecule may have the following formula: V _H (A)- V _H (B). Each V _H comprises CDR and FR regions. Thus, the binding molecule may have the following formula: FR1 (A)-CDR1 (A)-FR2(A)-CDR2(A)-FR3(A)-CDR3(A)-FR4(A)- FR1 (B)- CDR1 (B)-FR2(B)-CDR2(BA)-FR3(B)-CDR3(B)-FR4(B). The order of the immunoglobulin single variable domains A (first single V _H domain antibody) and B (second single V _H domain antibody) is not particularly limited, so that, within a polypeptide of the invention, immunoglobulin single variable domain A may be located N-terminally and immunoglobulin single variable domain B may be located C-terminally, or vice versa. The V _H domains may be connected via a linker.

In one embodiment, the binding molecule is biparatopic. In a biparatopic binding molecule, the two binding moieties bind to different epitopes on a target molecule. Preferred biparatopic binding molecules comprise two different single V _H domain antibodies that bind to the target protein PSMA, but on different sites. These sites may be overlapping. Complete or partial blocking can be assessed in epitope binning studies.

The term "epitope" or "antigenic determinant" refers to a site on the surface of an antigen (e.g., PSMA) to which an immunoglobulin, antibody or antibody fragment, including a VH single domain antibody specifically binds. Generally, an antigen has several or many different epitopes and reacts with many different antibodies. The term specifically includes linear epitopes and conformational epitopes. Epitopes within protein antigens can be formed both from contiguous amino acids (usually a linear epitope) or non-contiguous amino acids juxtaposed by tertiary folding of the protein (usually a conformational epitope). Epitopes formed from contiguous amino acids are typically, but not always, retained on exposure to denaturing solvents, whereas epitopes formed by tertiary folding are typically lost on treatment with denaturing solvents. An epitope typically includes at least 3, 4, 5, 6, 7, 8, 9, 10, 1 1 , 12, 13, 14 or 15 amino acids in a unique spatial conformation. Methods for determining what epitopes are bound by a given antibody or antibody fragment (i.e., epitope mapping) are well known in the art and include, for example, immunoblotting and immunoprecipitation assays, wherein overlapping or contiguous peptides from are tested for reactivity with a given antibody or antibody fragment. An antibody binds "essentially the same epitope" as a reference antibody, when the two antibodies recognize identical or sterically overlapping epitopes. The most widely used and rapid methods for determining whether two epitopes bind to identical or sterically overlapping epitopes are competition assays, which can be configured in different formats, using either labelled antigen or labelled antibody. In one embodiment, the binding molecule is bivalent. Bivalent binding molecules comprise two Humabody® V _H that bind to the same target protein (PSMA) at the same sites. In one embodiment, such molecules may comprise the same Humabody® V _H . In another embodiment, such molecules may comprise two Humabody® V _H that are part of the same Humabody® V _H family. In another embodiment, such molecules may comprise two Humabody® V _H that are not part of the same Humabody® V _H but bind to the same site. Biparatopic and bivalent binding molecules of the present invention can be constructed using methods known in the art. As described in more detail in the experimental part, single V _H domain antibodies that can be used in the multiparatopic or multivalent binding molecules of the invention were isolated and grouped into 15 families based on sequence homology in the CDR3 sequence. Through a process of optimization, a panel of variant single V _H domain antibodies with a CDR sequence derived from a parent CDR sequence were also generated to improve affinities to PSMA and/or improve potencies compared to the parent molecule. Each single V _H domain antibody has a set of CDR sequences (CDR1 , 2 and 3) as shown in Figures 1 to 15. Epitope binning studies were conducted to assess epitope binding as demonstrated in example 1 1. For example, it was demonstrated that the single V _H domain antibodies in family 1 bind to a different epitope than those in family 2. Combinations of a family 1 single V _H domain antibody and a family 2 single V _H domain antibody are thus one embodiment of the biparatopic binding molecule of the invention. Family 1 single V _H domain antibody can be located at the C or N terminus. In a preferred embodiment, it is located at the N terminus.

In some embodiments, the first or second single V _H domain antibody is a variant V _H single domain antibodies of a parent molecules, in particular of a parent V _H single domain antibody selected from sdAb 1.1 , 2.1 , 3.1 , 4.1 , 5.1 , 6.1 , 7.1 , 8.1 , 9.1 , 10.1 , 1 1.1 , 12.1 , 13.1 , 14.1 or 15.1 having one or more amino acid substitutions, deletions, insertions or other modifications, and which retains a biological function of the single domain antibody. Thus, a variant V _H single domain antibody can be sequence engineered. Modifications may include one or more substitution, deletion or insertion of one or more codons encoding the single domain antibody or polypeptide that results in a change in the amino acid sequence as compared with the native sequence V _H single domain antibody or polypeptide. Amino acid substitutions can be the result of replacing one amino acid with another amino acid having similar structural and/or chemical properties, such as the replacement of a leucine with a serine, i.e., conservative amino acid replacements. Insertions or deletions may optionally be in the range of about 1 to 5 amino acids. The variation allowed may be determined by systematically making insertions, deletions or substitutions of amino acids in the sequence and testing the resulting variants for activity exhibited by the full-length or mature native sequence. A variant of a V _H single domain antibody described herein has at least 75%, 76%, 77%, 78%, 79%, 8 0%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% sequence homology to the non-variant molecule, preferably at least 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% sequence homology.

In one embodiment, the modification is a conservative sequence modification. As used herein, the term "conservative sequence modifications" is intended to refer to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody containing the amino acid sequence. Such conservative modifications include amino acid substitutions, additions and deletions. Modifications can be introduced into binding molecule of the invention by standard techniques known in the art, such as site-directed mutagenesis and PCR-mediated mutagenesis. Conservative amino acid substitutions are ones in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine, tryptophan), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Thus, one or more amino acid residues within the CDR regions of a single domain antibody can be replaced with other amino acid residues from the same side chain family and the altered antibody can be tested for retained function (i.e., the functions set forth in (c) through (I) above) using the functional assays described herein.

In some embodiments, the V _H single domain antibody that is a variant of a single domain antibody selected from those shown in Tables 1 to 15 that comprises one or more sequence modification and has improvements in one or more of a property such as binding affinity, specificity, thermostability, expression level, effector function, glycosylation, reduced immunogenicity, or solubility as compared to the unmodified single domain antibody.

A skilled person will know that there are different ways to identify, obtain and optimise the antigen binding molecules as described herein, including in vitro and in vivo expression libraries. This is further described in the examples. Optimisation techniques known in the art, such as display (e.g., ribosome and/or phage display) and / or mutagenesis (e.g., error-prone mutagenesis) can be used. The invention therefore also comprises sequence optimised variants of the single domain antibodies described herein.

In one embodiment, modifications can be made to decrease the immunogenicity of the single domain antibody. For example, one approach is to revert one or more framework residues to the corresponding human germline sequence. More specifically, a single domain antibody that has undergone somatic mutation may contain framework residues that differ from the germline sequence from which the single domain antibody is derived. Such residues can be identified by comparing the single domain antibody framework sequences to the germline sequences from which the single domain antibody is derived. To return one or more of the amino acid residues in the framework region sequences to their germline configuration, the somatic mutations can be "backmutated" to the germline sequence by, for example, site- directed mutagenesis or PCR-mediated mutagenesis.

Another type of framework modification involves mutating one or more residues within the framework region, or even within one or more CDR regions, to remove T cell epitopes to thereby reduce the potential immunogenicity of the antibody. In still another embodiment, the glycosylation of an antibody is modified. For example, an aglycoslated antibody can be made (i.e., the antibody lacks glycosylation). Glycosylation can be altered to, for example, increase the affinity of the antibody for antigen. Such carbohydrate modifications can be accomplished by, for example, altering one or more sites of glycosylation within the antibody sequence. For example, one or more amino acid substitutions can be made that result in elimination of one or more variable region framework glycosylation sites to thereby eliminate glycosylation at that site. Such aglycosylation may increase the affinity of the antibody for antigen. In one aspect, the binding molecule comprises a single V _H domain antibody comprising a family 1 or a family-1 like sequence. In one embodiment, two V _H domains comprising a family 1 or a family-1 like sequence may be combined for a bivalent binding molecule. In another embodiment, a first V _H domain comprising a family 1 or a family-1 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from family 1 , 5, 6, 12 or 13 or family 1 , 5, 6, 12 or 13-like sequence. In one embodiment, the first V _H domain comprises SEQ ID No:4 and the second V _H domain comprises SEQ ID NO:4. In one embodiment, a first V _H domain comprising a family 1 or a family-1 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or 14 or a family 2, 3, 4, 7, 9, 10, 1 1 or 14-like sequence. In one embodiment, the first V _H domain comprises SEQ ID No:4 and the second V _H domain comprises SEQ ID NO:84. A single V _H domain antibody of family 1 may include the sequence of the parent (1.1 ; SEQ ID NO. 4) or a part thereof, for example a CDR3 sequence, and sequences that are derived from the parent 1.1 through a process of optimization, for example sequences as shown as shown in Figure 1. CDR sequences and full length V _H sequences in family 1 are numbered according to Table 1 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

1.1 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 4

NO. 1 NO. 2 3 EVQLLESGGGLVQPGGSLRLSCAASGFS SYAMS SIGENDGT DGVH FSSYAMSWVRQAPGKGLEWVSSIGEND

TDYADSV GTTDYADSVKGRFTISRDNSKSMLYLQM

KG N S LR V E DTA VYYC V KD G V H WG QGT LVTV SS

1.2 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 8

NO. 5 NO. 6 7 EVQLVESGGGLVQPGGSLRLSCAASGFT SYAMS SIGDNNNS DGVH FSSYAM SWVRQA PG KG LEWVSSI G D N N

TEYADSV NSTEYADSVKGRFTISRDNSKSTLYLQMN

KG S LS A E DTA VYYC V KD G V H WGQGT LVTVS

S

1.3 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 12

NO. 9 NO. 10 1 1 EVQLVESGGGLVQPGGSLRLSCAASGFS SYAMS IGDNNNST DGVH FSSYAM SWVRQA PG KG LEWVSSI G D N N DYADSVK NSTDYADSVKGRFTISRDNSKSTLYLQMN G SLRAEDTAVYYCVKDGVHWGQGTLVTVS

S

1.4 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 16

NO. 13 NO. 14 15 EVQLVESGGGLVQPGGSLRLSCAASGFT SYAMS IGDGTTYY DGVH FSSYAMSWVRQAPGKGLEWVSSIGDGT ADSVKG TYYADSVKGRFTISRDNSKSTLYLQMNSL RAEDTAVYYCAKDGVHWGQGTLVTVSS

1.5 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 20

NO. 17 NO. 18 19 EVQLVESGGGLVQPGGSLRLSCAASGFT TYAMS SIGENDRT DGVH FSTYAMSWVRQAPGKGLEWVSSIGEND TYYVDSV RTTYYVDSVKGRFTISRDNSKSTLYLQMN KG SLRAEDTAVYYCAKDGVHWGQGTLVTVS

S

1.6 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 24

NO. 21 NO. 22 23 QVQLVESGGGLVQPGGSLRLSCAASGFT SYAMS SIGDNNRT DGVH FSSYAM SWVRQA PG KG LEWVSSI G D N N TYYADSV RTTYYADSVKGRFTISRDNSKSTLYLQMN KG SLRAEDTAVYYCAKDGVHWGQGTLVTVS

S

1.7 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 28

NO. 25 NO. 26 27 EVQLVESGGGLVQPGGSLRLSCAASGFT SYAMS SIGDGTTY DGVH FSSYAMSWVRQAPGKGLEWVSSIGDGT YADSVKG TYYADSVKGRFTISRDNSKSTLYLQMNSL RAEDTAVYYCAKDGVHWGQGTLVTVSS SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 32

NO. 29 NO. 30 31 EVQLLESGGGLVQPGGSLRLSCAASGFS SYAMS SIGENDGT DGVH FSSYAMSWVRQAPGKGLEWVSSIGEND TDYADSV GTTDYADSVKGRFTISRDNSKNTLYLQM KG NSLRVEDTAVYYCVKDGVHWGQGTLVTV

SS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 36

NO. 33 NO. 34 35 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENDGT DGVH FSSYALSWVRQAPGKGLEWVSSIGENDG TDYADSV TTDYADSVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 40

NO. 37 NO. 38 39 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNAT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNA TDYADFV TTDYADFVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 44

NO. 41 NO. 42 43 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNDT DGVH FSSYALSWVRQAPGKGLEWVSSIGENND TDYADNV TTDYADNVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 48

NO. 45 NO. 46 47 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNAT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNA TDYADAV TTDYADAVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 52

NO. 49 NO. 50 51 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNHT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNH TDYAADV TTDYAADVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 56

NO. 53 NO. 54 55 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNAT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNA TDYADVV TTDYADVVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 60

NO. 57 NO. 58 59 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNHT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNH TDYAAFVK TTDYAAFVKGRFTISRDNSKNTLYLQMNS G LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 64

NO. 61 NO. 62 63 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNHT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNH TDYADTV TTDYADTVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 68

NO. 65 NO. 66 67 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNDT DGVH FSSYALSWVRQAPGKGLEWVSSIGENND TDYADAV TTDYADAVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 72

NO. 69 NO. 70 71 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNAT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNA TDYAASV TTDYAASVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

1.19 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 76

NO. 73 NO. 74 75 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNDT DGVH FSSYALSWVRQAPGKGLEWVSSIGENND TDYAAYV TTDYAAYVKGRFTISRDNSKNTLYLQMNS KG LRVEDTAVYYCVKDGVHWGQGTLVTVSS

1.20 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 80

NO. 77 NO. 78 79 EVQLLESGGGLVQPGGSLRLSCAASGFS SYALS SIGENNHT DGVH FSSYALSWVRQAPGKGLEWVSSIGENNH TDYAATVK TTDYAATVKGRFTISRDNSKNTLYLQMNS G LRVEDTAVYYCVKDGVHWGQGTLVTVSS

Table 1. This shows SEQ ID NOs. of family 1 CDR sequences and of family 1 full length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 1. Family 1 -like sequences are variants that have certain percentage sequence identity with family 1 sequences as set out herein.

In one aspect, the V _H domain comprises a CDR3 sequence comprising SEQ ID NO. 3 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 3.

In one embodiment, the V _H domain comprises a CDR3 sequence comprising or consisting of an amino acid sequence selected from SEQ ID NO. 3, 7, 1 1 , 15, 19, 23, 27, 31 , 35, 39, 43, 47, 51 , 55, 59, 63, 67, 71 , 75 or 79. In one embodiment, the V _H domain comprises hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises the amino acid sequence SEQ ID NO. 1 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprising the amino acid sequence SEQ ID NO. 2 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprising the amino acid sequence SEQ ID NO. 3 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. For example, the CDR may be a CDR selected from those shown in Figure 1.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 1 or a sequence with at least at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 2 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 3 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the CDR sequences of the V _H domain are as shown for single V _H domain antibodies 1.1 to 1.20 as in Figure 1 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 1 , 5, 9, 13, 17, 21 , 25, 29, 33, 37, 41 , 45, 49, 53, 57, 61 , 65, 69, 73 or 77, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 70, 74 or 78 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 3, 7, 11 , 15, 19, 23, 27, 31 , 35, 39, 43, 47, 51 , 55, 59, 63, 67, 71 , 75 or 79. IN one embodiment, CDR is SEQ ID NO. 33.

In one aspect, the single V _H domain antibody has combinations of CDR1 , CDR2 and CDR3 as shown for clones 1.1 to 1.20 in Figure 1. Thus, in one embodiment, the single V _H domain antibody comprises CDR1 , 2 and 3 sequences wherein CDR1 is SEQ ID NO. 1 , CDR2 is SEQ ID NO. 2 and CDR3 is SEQ ID NO. 3. In another embodiment, CDR1 is SEQ ID NO. 5, CDR2 is SEQ ID NO. 6 and CDR3 is SEQ ID NO. 7. In another embodiment, CDR1 is SEQ ID NO. 9, CDR2 is SEQ ID NO. 10 and CDR3 is SEQ ID NO. 1 1. In another embodiment, CDR1 is SEQ ID NO. 13, CDR2 is SEQ ID NO. 14 and CDR3 is SEQ ID NO. 15. In another embodiment, CDR1 is SEQ ID NO. 17, CDR2 is SEQ ID NO. 18 and CDR3 is SEQ ID NO. 19. In another embodiment, CDR1 is SEQ I D NO. 21 , CDR2 is SEQ ID NO. 22 and CDR3 is SEQ ID NO. 23. In another embodiment, CDR1 is SEQ ID NO. 25, CDR2 is SEQ ID NO. 26 and CDR3 is SEQ ID NO. 27. In another embodiment, CDR1 is SEQ ID NO. 29, CDR2 is SEQ ID NO. 30 and CDR3 is SEQ ID NO. 31. In another embodiment, CDR1 is SEQ ID NO. 33, CDR2 is SEQ ID NO. 34 and CDR3 is SEQ ID NO. 35. In another embodiment, CDR1 is SEQ ID NO. 37, CDR2 is SEQ ID NO. 38 and CDR3 is SEQ ID NO. 39. In another embodiment, CDR1 is SEQ ID NO. 41 , CDR2 is SEQ ID NO. 42 and CDR3 is SEQ ID NO. 43. In another embodiment, CDR1 is SEQ ID NO. 45, CDR2 is SEQ ID NO. 46 and CDR3 is SEQ ID NO. 47. In another embodiment, CDR1 is SEQ ID NO. 49, CDR2 is SEQ ID NO. 50 and CDR3 is SEQ ID NO. 51. In another embodiment, CDR1 is SEQ ID NO. 53, CDR2 is SEQ ID NO. 54 and CDR3 is SEQ ID NO. 55. In another embodiment, CDR1 is SEQ ID NO. 57, CDR2 is SEQ ID NO. 58 and CDR3 is SEQ ID NO. 59. In another embodiment, CDR1 is SEQ ID NO. 61 , CDR2 is SEQ ID NO. 62 and CDR3 is SEQ ID NO. 63. In another embodiment, CDR1 is SEQ ID NO. 65, CDR2 is SEQ ID NO. 66 and CDR3 is SEQ ID NO. 67. In another embodiment, CDR1 is SEQ ID NO. 69, CDR2 is SEQ ID NO. 70 and CDR3 is SEQ ID NO. 71. In another embodiment, CDR1 is SEQ ID NO. 73, CDR2 is SEQ ID NO. 74 and CDR3 is SEQ ID NO. 75. In another embodiment, CDR1 is SEQ ID NO. 77, CDR2 is SEQ ID NO. 78 and CDR3 is SEQ ID NO. 79.

In one embodiment, the single V _H domain antibody has a V _H domain that comprises or consists of SEQ ID NO. 4 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. CDR sequences of such sequences are shown in Figure 1. For example, the V _H domain comprises or consists of SEQ ID NO. 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72 76 or 80. In another embodiment, the V _H domain is selected from one of the sequences above, for example SEQ ID NO. 4, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 4 or a sequence which comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions in the framework regions as compared to SEQ ID NO. 4. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 32.

Thus, in one embodiment, the invention relates to a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said V _H domain comprises or consists of SEQ ID NO. 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76 or 80 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the single V _H domain antibody comprises a V _H domain as shown in SEQ ID NO. 4 or a variant thereof wherein in said variant, residue 33 is T, 36 is L, residue 57 is D, residue 59 is N, R, A, D, H, residue 63 D, Y, residue 65 is V, residue 66 is A, and/or residue 67 is F, N, A, D, V, T, S, Y.

In one embodiment, the V _H domain is as shown in SEQ ID NO. 4 or a variant thereof wherein said variant includes the following changes compared to SEQ ID NO. 4 - S77→N and M78→T (as shown for 1.8)

- M34→L, D55→N, G56→H, D62→A, S63→T and optionally S77→N and M78→T (as shown for 1.20)

- M34→L, D55→N, G56→A, S63→F and optionally S77→N and M78→T (as shown for 1.10)

- M34→L, D55→N, G56→D, S63→F and optionally S77→N and M78→T (as shown for 1.11)

- M34→L, D55→N, G56→A, S63→A and optionally S77→N and M78→T (as shown for 1.12)

- M34→L, D55→N, G56→H, D62→A, S63→D and optionally S77→N and M78→T (as shown for 1.13)

- M34→L, D55→N, G56→A, S63→V and optionally S77→N and M78→T (as shown for 1.14)

- M34→L, D55→N, G56→H, D62→A, S63→F and optionally S77→N and M78→T (as shown for 1.15)

- M34→L, D55→N, G56→H, S63→T and optionally S77→N and M78→T (as shown for 1.16)

- M34→L, D55→N, G56→H, S63→T and optionally S77→N and M78→T (as shown for 1.17)

- M34→L, D55→N, G56→D, D62→A, S63→S and optionally S77→N and M78→T (as shown for 1.18)

- M34→L, D55→N, G56→A, D62→A, S63→Y and optionally S77→N and M78→T (as shown for 1.19). In one embodiment, additional changes may be included. In another embodiment, the variants listed above do not include additional changes.

The single V _H domain antibody in family 1 has KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples. The term "KD" as used in this application refers to the "equilibrium dissociation constant" and refers to the value obtained in a titration measurement at equilibrium, or by dividing the dissociation rate constant (Koff) by the association rate constant (Kon). "KA" as used in this application refers to the affinity constant. The association rate constant, the dissociation rate constant and the equilibrium dissociation constant are used to represent the binding affinity of an antibody to an antigen. Methods for determining association and dissociation rate constants are well known in the art. Using fluorescence-based techniques offers high sensitivity and the ability to examine samples in physiological buffers at equilibrium. Other experimental approaches and instruments such as a BIAcore® (biomolecular interaction analysis) assay and assays described in the examples can be used to test the binding molecules of the invention.

In one aspect, the binding molecule of the invention comprises one or more human V _H domain comprising a family 2 or family-2 like sequence. Thus, in one embodiment, the binding molecule comprises or consists of at least two single V _H domain antibody capable of binding PSMA, preferably human PSMA, of family 2. In another embodiment, one V _H domain comprising a family 2 or a family-2 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence.

In one embodiment, one V _H domain comprising a family 2 or a family-2 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence.

The family 2 single V _H domain antibody may include sequences that are derived from the parent (2.1 ; SEQ ID NO. 84) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 2.1 through a process of optimization, for example as shown in Figure 2. CDR sequences and full length sequences of clones in family 2 are numbered according to Table 2 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

2.1 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 84

NO. 81 NO. 82 83 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH YISYD DPAWGLRL GYGMHWVRQAPGKGLEWVAYISYDGSNKY

GSNKY GESSSYDF YADSVKGRFTISRDNSKNTLYLQMNSLRAE

YADSV Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

KG QGTMVTVSS

2.2 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 88

NO. 85 NO. 86 87 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH YISYD DPAWGLRL GYGMHWVRQAPGKGLEWVAYISYDGSNKY

GSNKY GESSSYDF YADSVKGRFTISRDNSKNTLYLQMNSLRAE

YADSV Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

KG QGTMVTVSS

2.3 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 92 NO. 89 NO. 90 91 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH HISYD DPAWGLRL GYGMHWVRQAPGKGLEWVAHISYDGSNRY

GSNRY GELSSYDF YAESVKGRFTISRENSKNTLSLQMNSLRAED

YAESV Dl TAVYYCAKDPAWGLRLGELSSYDFDIWGQG

KG TMVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 96

NO. 93 NO. 94 95 QVTLKESGGGWQPGRSLKLSCAASGFSFS

GYGMH VISYD DPAWGLRL GYGMHWVRQAPGKGLEWVAVISYDGSNRY

GSNRY GELSSYDF YADSVKGRFTISRDNSKNTLSLQMNSLRAE

YADSV El DTA VYYC A R D PA WG LRLGELSSYDFEI WG Q

KG GTMVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 100

NO. 97 NO. 98 99 QVQLVESGGGVVQPGRSLRLSCAASGFSF

GYGMH VISYD DPAWGLRL SGYGMHWVRQAPGKGLEWVAVISYDGSNR

GSNRY GELSSYDF YYADSVKGRFTISRDNSKNTLSLQMNSLRA

YADSV El EDTAVYYCAKDPAWG LRLGELSSYDFEI WG

KG QGTMVTVSS

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 104

NO. 101 NO. 103 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH 102 DPAWGLRL GYGMHWVRQAPGKGLEWVAVISYDGSNKY

VISYD GELSSYKF YADSVKGRFTISRDNSKNTLYLQMNSLRAE

GSNKY El DTAVYYCAKDPAWGLRLGELSSYKFEIWGQ

YADSV GTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 108

NO. 105 NO. 107 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH 106 DPAWGLRL GYGMHWVRQAPGKGLEWVALISYDGSNKY

LISYD GEQSSYAF YADSVKGRFTISRDNSKNTLYLQMNSLRAE

GSNKY Dl DTAVYYCAKDPAWGLRLGEQSSYAFDIWG

YADSV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 112

NO. 109 NO. 11 1 QVQLVESGGGVVQPGRSLRLSCAASGFSF

GYGMH 110 DPAWGLRL SGYGMHWVRQAPGKGLEWVSVISYDGSNK

VISYD GEQSSYAF YYADSVKGRFTISRDNSKNTLYLQMNSLRTE

GSNKY E DTAVYYCAKDPAWGLRLGEQSSYAFEIWG

YADSV QGTMVTVSS KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 116

NO. 113 NO. 115 EVQLLESGGGVVQPGRSLRLSCAASGFSFS

GYGMH 114 DPAWGLRL GYGMHWVRQAPGKGLEWVAVISYDGSNKY

VISYD GEQSSYAF YADSVKGRFTISRDNSKNTLYLQMNSLRVE

GSNKY El DTAVYYCAKDPAWGLRLGEQSSYAFEIRGQ

YADSV GTTVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 120

NO. 117 NO. 119 EVQLVESGGGVVQPGRSLRLSCAASGFTFS

GYGMH 118 DPAWGLRL GYGMHWVRQAPGKGLEWVAYISYDGSNRY

YISYD GESSSYDF YADSVKGRFTISRDNSKKTLSLQMNSLRAE

GSNRY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADSV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 124

NO. 121 NO. 123 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGLH 122 DPAWGLRL GYGLH WVRQAPGKGLEWVAYISYDESNKY

YISYD GESSSYDF YAPSVKGRFTISRDNSKNTLYLQMNSLRAE

ESNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YAPSV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 128

NO. 125 NO. 127 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGMH 126 DPAWGLRL GYGMHWVRQAPGKGLEWVAYISYDKSNKY

YISYD GESSSYDF YADKVKGRFTISRDNSKNTLYLQMNSLRAE

KSNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADKV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 132

NO. 129 NO. 131 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGLH 130 DPAWGLRL GYGLH WVRQAPGKGLEWVAYISYDASNKY

YISYD GESSSYDF YADNVKGRFTISRDNSKNTLYLQMNSLRAE

ASNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADNV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 136 NO. 133 NO. 135 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGVH 134 DPAWGLRL GYGVH WVRQAPGKGLEWVAYISYDASNKY

YISYD GESSSYDF YADNVKGRFTISRDNSKNTLYLQMNSLRAE

ASNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADNV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 140

NO. 137 NO. 139 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGLH 138 DPAWGLRL GYGLH WVRQAPGKGLEWVAYISYDKSNKY

YISYD GESSSYDF YADKVKGRFTISRDNSKNTLYLQMNSLRAE

KSNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADKV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 144

NO. 141 NO. 143 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGAH 142 DPAWGLRL GYGAH WVRQAPGKGLEWVAYISYDKSNKY

YISYD GESSSYDF YADKVKGRFTISRDNSKNTLYLQMNSLRAE

KSNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADKV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 148

NO. 145 NO. 147 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGMH 146 DPAWGLRL GYGMHWVRQAPGKGLEWVAYISYDASNKY

YISYD GESSSYDF YADNVKGRFTISRDNSKNTLYLQMNSLRAE

ASNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADNV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 152

NO. 149 NO. 151 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGQH 150 DPAWGLRL GYGQHWVRQAPGKGLEWVAYISYDASNKY

YISYD GESSSYDF YADNVKGRFTISRDNSKNTLYLQMNSLRAE

ASNKY D DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADNV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 156

NO. 153 NO. 155 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGFH 154 DPAWGLRL GYGFHWVRQAPGKGLEWVAYISYDASNKY YISYD GESSSYDF YADNVKGRFTISRDNSKNTLYLQMNSLRAE

ASNKY Dl DTAVYYCAKDPAWGLRLGESSSYDFDIWG

YADNV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 160

NO. 157 NO. 159 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH 158 DPAWGLRL GYGMHWVRQAPGKGLEWVAIISYDGSNRY

IISYDG GESSSYDF YADSVKGRFTISRDNSKNTLSLQMNSLRAE

SNRYY El DTAVYYCAKDPAWGLRLGESSSYDFEIWGQ

ADSVK GTMVTVSS G

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 164

NO. 161 NO. 163 QVQLVESGGGWQPGRSLKLSCAASGFSFS

GYGMH 162 DPAWGLRL GYGMHWVRQAPGKGLEWVAVISYDGSNRY

VISYD GKLSSYDF YADSVKGRFTISRDNSKNTLSLQMNSLRAE

GSNRY El DTA VYYC A KD PA WG LRLGKLSSYDFEI WG Q

YADSV GTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 168

NO. 165 NO. 167 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGTH 166 DAAWGLRL GYGTH WVRQAPG KG LEWVAYISYDGSNKY

YISYD GESSSYDF YAAPVKGRFTISRDNSKNTLYLQMNSLRAE

GSNKY Dl DTAVYYCAKDAAWGLRLGESSSYDFDIWG

YAAPV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 172

NO. 169 NO. 171 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGTH 170 DRAWGLRL GYGTHWVRQAPGKGLEWVAYISYDESNKY

YISYD GESSSYDF YASSVKGRFTISRDNSKNTLYLQMNSLRAE

ESNKY Dl DTAVYYCA KD RA WG LR LG ESSSYD F D I WG

YASSV QGTMVTVSS

KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 176

NO. 173 NO. 175 EVQLVESGGGVVQPGRSLRLSCAASGFSFS

GYGMH 174 DTAWGLRL GYGMHWVRQAPGKGLEWVAYISYDESNKY

YISYD GESSSYDF YARLVKGRFTISRDNSKNTLYLQMNSLRAED

ESNKY Dl TAVYYCAKDTAWGLRLGESSSYDFDIWGQ YARLV GTMVTVSS

KG

2.25 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 180

NO. 177 NO. 179 EVQLVESGGGWQPGRSLRLSCAASGFSFS

GYGLH 178 DVAWGLRL GYGLH WVRQAPGKGLEWVAYISYDLSNKY

YISYDL GESSSYDF YARGVKGRFTISRDNSKNTLYLQMNSLRAE

SNKYY Dl DTAVYYCAKDVAWGLRLGESSSYDFDIWG

ARGVK QGTMVTVSS G

Table 2. This shows SEQ ID NOs of family 2 CDR sequences and of family 2 full length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 2. Family 2-like sequences are variants that have certain percentage sequence identity with Family 2 sequences as set out herein.

In one aspect, the V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 83 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 83. In one embodiment, the V _H domain comprises a CDR3 selected from SEQ ID NO. 83, 87, 91 , 95, 99, 103, 107, 11 1 , 115, 1 19, 123, 127, 131 , 135, 139, 143, 147, 151 , 155, 159, 163, 167, 171 , 175 or 179.

In one embodiment, the V _H domain comprises at least one antigen binding site comprising CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 75 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 2 family 2-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 81 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 82 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 83 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 81 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 82 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 83 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for sdAbs 2.1 to 2.25 as in Figure 2 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 81 , 85, 89, 93, 97, 101 , 105, 109, 113, 1 17, 121 , 125, 129, 133, 137, 141 , 145, 149, 153, 157, 161 , 165, 169, 173 or 177, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 82, 86, 90, 94, 98, 102, 106, 110, 114, 118, 122, 126, 130, 134, 138, 142, 146, 150, 154, 158, 162, 166, 170, 174 or 178 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. SEQ ID NO. 783, 87, 91 , 95, 99, 103, 107, 11 1 , 115, 119, 123, 127, 131 , 135, 139, 143, 147, 151 , 155, 159, 163, 167, 171 , 175 or 179. In one aspect, the single V _H domain antibody has combinations of CDR1 , CDR2 and CDR3 as shown for 2.1 to 2.25 in Figure 2. In another embodiment, CDR1 is SEQ ID NO. 81 , CDR2 is SEQ ID NO. 82 and CDR3 is SEQ ID NO. 83. In another embodiment, CDR1 is SEQ ID NO. 85, CDR2 is SEQ ID NO. 86 and CDR3 is SEQ ID NO. 87. In another embodiment, CDR1 is SEQ ID NO. 89, CDR2 is SEQ ID NO. 90 and CDR3 is SEQ ID NO. 91. In another embodiment, CDR1 is SEQ ID NO. 93, CDR2 is SEQ ID NO. 94 and CDR3 is SEQ ID NO. 95. In another embodiment, CDR1 is SEQ ID NO. 97, CDR2 is SEQ ID NO. 98 and CDR3 is SEQ ID NO. 99. In another embodiment, CDR1 is SEQ ID NO. 101 , CDR2 is SEQ ID NO. 102 and CDR3 is SEQ ID NO. 103. In another embodiment, CDR1 is SEQ ID NO. 104, CDR2 is SEQ ID NO. 105 and CDR3 is SEQ ID NO. 106. In another embodiment, CDR1 is SEQ ID NO. 108, CDR2 is SEQ ID NO. 109 and CDR3 is SEQ ID NO. 1 10. In another embodiment, CDR1 is SEQ ID NO. 1 12, CDR2 is SEQ ID NO. 113 and CDR3 is SEQ ID NO. 1 15. In another embodiment, CDR1 is SEQ ID NO. 1 17, CDR2 is SEQ ID NO. 1 18 and CDR3 is SEQ ID NO. 119. In another embodiment, CDR1 is SEQ ID NO. 121 , CDR2 is SEQ ID NO. 122 and CDR3 is SEQ ID NO. 123. In another embodiment, CDR1 is SEQ ID NO. 125, CDR2 is SEQ ID NO. 127 and CDR3 is SEQ ID NO. 127. In another embodiment, CDR1 is SEQ ID NO. 129, CDR2 is SEQ ID NO. 130 and CDR3 is SEQ ID NO. 131. In another embodiment, CDR1 is SEQ ID NO. 133, CDR2 is SEQ ID NO. 134 and CDR3 is SEQ ID NO. 135. In another embodiment, CDR1 is SEQ ID NO. 137, CDR2 is SEQ ID NO. 138 and CDR3 is SEQ ID NO. 139. In another embodiment, CDR1 is SEQ ID NO. 140, CDR2 is SEQ ID NO. 141 and CDR3 is SEQ ID NO. 142. In another embodiment, CDR1 is SEQ ID NO. 144, CDR2 is SEQ ID NO. 145 and CDR3 is SEQ ID NO. 146. In another embodiment, CDR1 is SEQ ID NO. 148, CDR2 is SEQ ID NO. 149 and CDR3 is SEQ ID NO. 150. In another embodiment, CDR1 is SEQ ID NO. 152, CDR2 is SEQ ID NO. 153 and CDR3 is SEQ ID NO. 154. In another embodiment, CDR1 is SEQ ID NO. 157, CDR2 is SEQ ID NO. 158 and CDR3 is SEQ ID NO. 159. In another embodiment, CDR1 is SEQ ID NO. 161 , CDR2 is SEQ ID NO. 162 and CDR3 is SEQ ID NO. 163. In another embodiment, CDR1 is SEQ ID NO. 165, CDR2 is SEQ ID NO. 166 and CDR3 is SEQ ID NO. 167. In another embodiment CDR1 is SEQ ID NO. 169, CDR2 is SEQ ID NO. 170 and CDR3 is SEQ ID NO. 171. In another embodiment, CDR1 is SEQ ID NO. 173, CDR2 is SEQ ID NO. 174 and CDR3 is SEQ ID NO. 175. In another embodiment, CDR1 is SEQ ID NO. 177, CDR2 is SEQ ID NO. 178 and CDR3 is SEQ ID NO. 179.

In one embodiment, the single V _H domain antibody comprises or consists of SEQ ID NO. 84 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95% 96%, 97%, 98% or 99% homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 2. For example, the single V _H domain antibody comprises or consists of SEQ ID NO. 84, 88, 92, 96, 100, 104, 108, 1 12, 1 16, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 172, 176 or 180. In another embodiment, the V _H domain is selected from one of the sequences above, for example SEQ ID NO. 84, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

In one embodiment, the single V _H domain antibody comprises SEQ ID NO. 84 or a variant thereof wherein the variant has the following amino acid substitutions compared to SEQ ID NO. 76: residue 34 is L, V, M, Q, T, F, residue 50 is H, V, L, I, residue 55 is E, K, A, L, residue 58 is R, residue 62 is E, P, R, S, A, residue 63 is E, residue 64 is N, K, P, L, G, S, residue 79 is K, residue is L, Q, residue 84 is K, A, residue is D. In one embodiment, the single V _H domain antibody comprises or consists of a V _H as shown in SEQ ID NO. 4 or a variant thereof wherein said variant includes the following changes compared to SEQ ID NO. 84:

1) M34→L34, G55→A55 and S63→N63 (as shown for 2.13),

2) G55→A55, G55→A55 and S63→N63 (as shown for 2.17),

3) M34→L34, G55→K55 and S63→K63 (as shown for 2.15),

4) G55→K55, and S63→K63 (as shown for 2.15) or

5) M34→L34, G55→E55 and D62→S62 (as shown for 2.11). In one embodiment, additional changes may be included. In another embodiment, the variants listed above do not include additional changes. In one embodiment, the variant does not include a combination of the following changes: G55→A55, S63→N63, D99→N99 together with P100→T100; G34→L34, G55→K55 together with S63→K63; G55→T55, S63→R63, D99→G99 together with P100→R100.

The family 2 or family 2-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the binding molecule capable of binding human PSMA comprises a human V _H domain comprising a family 3 or family-3 like sequence.

In one embodiment, two V _H domains comprising a family 3 or a family-3 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 3 or a family-3 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence.

In one embodiment, one V _H domain comprising a family 3 or a family-3 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence. A family 3 or family 3-like single V _H domain antibody includes the parent sequence and sequences of that are derived from the parent (3.1 ; SEQ ID NO. 184) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 3.1 through a process of optimization, for example as shown in Figure 3. CDR sequences and full-length sequences of clones in family 3 are numbered according to Table 3 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

3.1 SEQ ID SEQ ID SEQ ID NO. 184

NO. 181 NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI SYGMH 182 SEQ ID NO. SYGMHWVRQAPGKGLEWVAFMTYDGSNR

FMTYD 183 YYADSVKGRFTISRDNSKNTLYLQMNSLRD GSNRY DRIVGGRV EDTALYYCARDRIVGGRVPDAFDIWGQGTM YADSV PDAFDI VTVSS KG

3.2 SEQ ID SEQ ID

NO. 185 NO. SEQ ID NO. 188

SYGMN 186 SEQ ID NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FISYD 187 SYGMNWVRQAPGKGLDWVAFISYDGSNKY

GSNKY DRIVGARV YADSVKGRFTISKDNSKNTLYLQMNSLRAE

YADSV PDAFDI DTAVYYCAKDRIVGARVPDAFDIWGQGTMV

KG TVSS

3.3 SEQ ID SEQ ID

NO. 189 NO. SEQ ID NO. 192

SYGMN 190 SEQ ID NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FISYD 191 SYGMNWVRQAPGKGLEWVAFISYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRAE

YADSV PDAFDI DTAVYYCAKDRIVGARVPDAFDIWGQGTMV

KG TVSS

3.4 SEQ ID SEQ ID

NO. 193 NO. SEQ ID NO. 196

SYGMN 194 SEQ ID NO. EVQLVESGGGAVQPGRSLRLSCAASGFPLI

FITYD 195 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

3.5 SEQ ID SEQ ID

NO. 197 NO. SEQ ID NO. 200

SYGMN 198 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 199 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

3.6 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 204

NO. 201 NO. 203 EVQLLESGGGVVQPGRSLRLSCAASGFPLI SYGMN 202 DRIVGARV SYGMNWVRQAPGKGLDWVAFITYDGSNRY

FITYD PDAYDI YADSVKGRFTISRDNSKNTLYLQMNSLRPE GSNRY DTAVYYCAKDRIVGARVPDAYDIWGQGTMV YADSV TVSS KG

SEQ ID SEQ ID NO. 205 NO. SEQ ID NO. SEQ ID NO. 208

SYGMN 206 207 QVQLVESGGGLVQPGGSLRLSCAASGFPLI

FITYD DRIVGARV SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY PDAYDI YADSVKGRFTISRDNSKNTLHLQMDSLRPE

YADSV DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 209 NO. SEQ ID NO. 212

SYGMN 210 EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD SEQ ID NO. SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY 21 1 YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV DRIVGARV DTAVYYCAKDRIVGARVPDAYDIWGQGTLV

KG PDAYDI TVSS

SEQ ID SEQ ID NO. 213 NO. SEQ ID NO. 216

SYGMN 214 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FISYD 215 SYGMNWVRQAPGKGLEWVAFISYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 217 NO. SEQ ID NO. 220

SYGMN 218 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 219 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLHLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 221 NO. SEQ ID NO. 224

SYGMN 222 SEQ ID NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 223 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLHLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 225 NO. SEQ ID NO. 228

SYGMN 226 SEQ ID NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 227 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS SEQ ID SEQ ID

NO. 229 NO. SEQ ID NO. 232

SYGMN 230 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 231 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 233 NO. SEQ ID NO. 236

SYGMN 234 SEQ ID NO. EVQLVESGGGVVRPGGSLRLSCAASGFPLI

FITYD 235 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLHLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 237 NO. SEQ ID NO. 240

SYGMN 238 SEQ ID NO. EVQLVESGGGLVQPGGSLRLSCAASGFPLI

FITYD 239 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLHLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 241 NO. SEQ ID NO. 244

SYGMN 242 SEQ ID NO. EVQLLESGGGVVQPGRSLRLSCAASGFPLI

FITYD 243 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLHLQMNSLRPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 245 NO. SEQ ID NO. 248

SYGMN 246 SEQ ID NO. EVQLLESGGGVVQPGRSLRLSCAASGFPLI

FITYD 247 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLKPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID NO. 249 NO. SEQ ID NO. 252

SYGMN 250 SEQ ID NO. EVQLVESGGGVVQPGRSLRLSCAASGFPLI

FITYD 251 SYGMNWVRQAPGKGLDWVAFITYDGSNRY

GSNRY DRIVGARV YADSVKGRFTISRDNSKNTLYLQMNSLKPE

YADSV PDAYDI DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

KG TVSS

SEQ ID SEQ ID SEQ ID NO. 256

NO. 253 NO. SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI SYGMH 254 255 SYGMHWVRQAPGKGLEWVAFMTYDGSNR

FMTYD DRIVGGRV YYADAVKGRFTISRDNSKNTLYLQMNSLRA GSNRY PDAFDI EDTAVYYCARDRIVGGRVPDAFDIWGQGTM YADAV VTVSS KG

SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 260

NO. 257 NO. 259 QVQLVESGGGVVQPGRSLRLSCAASGFPLI SYGMH 258 DRIVGGRV SYGMHWVRQAPGKGLEWVAFQTYDGSNR

FQTYD PDAFDI YYADAVKGRFTISRDNSKNTLYLQMNSLRA

GSNRY EDTAVYYCARDRIVGGRVPDAFDIWGQGTM

YADAV VTVSS

KG

3.21 SEQ ID SEQ ID

NO. 261 NO. SEQ ID NO. 264

SYGMH 262 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FQTYD 263 SYGMHWVRQAPGKGLEWVAFQTYDGSNR GSNRY DRIVGGRV YYADSVKGRFTISRDNSKNTLYLQMNSLRA YADSV PDAFDI EDTAVYYCARDRIVGGRVPDAFDIWGQGTM KG VTVSS

3.22 SEQ ID SEQ ID

NO. 265 NO. SEQ ID NO. 268

SYGMH 266 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FQTYD 267 SYGMHWVRQAPGKGLEWVAFQTYDASNR

ASNRY DRIVGGRV YYADSVKGRFTISRDNSKNTLYLQMNSLRA

YADSV PDAFDI EDTAVYYCARDRIVGGRVPDAFDIWGQGTM

KG VTVSS

3.23 SEQ ID SEQ ID

NO. 269 NO. SEQ ID NO. 272

SYGMH 270 SEQ ID NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI

FQTYD 271 SYGMHWVRQAPGKGLEWVAFQTYDASNR

ASNRY DRIVGGRV YYADAVKGRFTISRDNSKNTLYLQMNSLRA

YADAV PDAFDI EDTAVYYCARDRIVGGRVPDAFDIWGQGTM

KG VTVSS

3.24 SEQ ID SEQ ID SEQ ID NO. 276

NO. 273 NO. QVQLVESGGGVVQPGRSLRLSCAASGFPLI SYGMN 274 SEQ ID NO. SYGMNWVRQAPGKGLEWVAFITYDGSNRY

FITYD 275 YADSVKGRFTISRDNSKNTLYLQMNSLRAE

GSNRY DRIVGARV DTAVYYCAKDRIVGARVPDAYDIWGQGTMV

YADSV PDAYDI TVSS

KG

Table 3. This shows SEQ ID NOs of family 3 CDR sequences and of family 3 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 3. Family 3-like sequences are variants that have certain percentage sequence identity with Family 3 sequences as set out herein.

In one aspect, the invention relates to a family 3 or family 3-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 183 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 183.

In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 183 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 183. In one embodiment, homology is at least 90%.

In one embodiment, the single V _H domain antibody comprises the amino acid sequence SEQ ID NO. 183 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 3 or family 3-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 181 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 182 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 183 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 181 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 182 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 183 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the CDR sequences of the V _H domain are as shown for sdAbs 3.1 to 3.24 as in Figure 3 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 181 , 185, 189, 193, 197, 201 , 205, 209, 213, 217, 221 , 225, 229, 233, 237, 241 , 245, 249, 253, 257, 261 , 265, 269 or 273, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 182, 186, 190, 194, 198, 202, 206, 210, 214, 218, 222, 226, 230, 234, 238, 242, 246, 250, 254, 258, 262, 266, 270 or 274 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 183, 187, 191 , 195, 199, 203, 207, 211 , 215, 219, 223, 227, 231 , 235, 239, 243 or 247, 251 , 255, 259, 263, 267, 271 or 275. In one aspect, the invention relates to a single V _H domain antibody which has combinations of CDR1 , CDR2 and CDR3 as shown for 3.1 to 3.24 in Figure 3. In one embodiment, CDR1 is SEQ ID NO. 181 , CDR2 is SEQ ID NO. 182 and CDR3 is SEQ ID NO. 183. In one embodiment, CDR1 is SEQ ID NO. 185, CDR2 is SEQ ID NO. 186 and CDR3 is SEQ ID NO. 187. In one embodiment, CDR1 is SEQ ID NO. 189, CDR2 is SEQ ID NO. 190 and CDR3 is SEQ ID NO. 191. In one embodiment, CDR1 is SEQ ID NO. 193, CDR2 is SEQ ID NO. 194 and CDR3 is SEQ ID NO. 195. In one embodiment, CDR1 is SEQ ID NO. 197, CDR2 is SEQ ID NO. 198 and CDR3 is SEQ ID NO. 199. In one embodiment, CDR1 is SEQ ID NO. 201 , CDR2 is SEQ ID NO. 202 and CDR3 is SEQ ID NO. 203. In one embodiment, CDR1 is SEQ ID NO. 205, CDR2 is SEQ ID NO. 206 and CDR3 is SEQ ID NO. 207. In one embodiment, CDR1 is SEQ ID NO. 209, CDR2 is SEQ ID NO. 210 and CDR3 is SEQ ID NO. 21 1. In one embodiment, CDR1 is SEQ ID NO. 213, CDR2 is SEQ ID NO. 214 and CDR3 is SEQ ID NO. 215. In one embodiment, CDR1 is SEQ ID NO. 217, CDR2 is SEQ ID NO. 218 and CDR3 is SEQ ID NO. 219. In one embodiment, CDR1 is SEQ ID NO. 221 , CDR2 is SEQ ID NO. 222 and CDR3 is SEQ ID NO. 223. In one embodiment, CDR1 is SEQ ID NO. 225, CDR2 is SEQ ID NO. 226 and CDR3 is SEQ ID NO. 227. In one embodiment, CDR1 is SEQ ID NO. 229, CDR2 is SEQ ID NO. 230 and CDR3 is SEQ ID NO. 231. In one embodiment, CDR1 is SEQ ID NO. 233, CDR2 is SEQ ID NO. 234 and CDR3 is SEQ ID NO. 235. In one embodiment, CDR1 is SEQ ID NO. 237, CDR2 is SEQ ID NO. 238 and CDR3 is SEQ ID NO. 239. In one embodiment, CDR1 is SEQ ID NO. 241 , CDR2 is SEQ ID NO. 242 and CDR3 is SEQ ID NO. 243. In one embodiment, CDR1 is SEQ ID NO. 245, CDR2 is SEQ ID NO. 246 and CDR3 is SEQ ID NO. 247. In one embodiment, CDR1 is SEQ ID NO. 249, CDR2 is SEQ ID NO. 250 and CDR3 is SEQ ID NO. 251. In one embodiment, CDR1 is SEQ ID NO. 253, CDR2 is SEQ ID NO. 254 and CDR3 is SEQ ID NO. 255. In one embodiment, CDR1 is SEQ ID NO. 257, CDR2 is SEQ ID NO. 258 and CDR3 is SEQ ID NO. 259. In one embodiment, CDR1 is SEQ ID NO. 261 , CDR2 is SEQ ID NO. 262 and CDR3 is SEQ ID NO. 263. In one embodiment, CDR1 is SEQ ID NO. 265, CDR2 is SEQ ID NO. 266 and CDR3 is SEQ ID NO. 267. In one embodiment, CDR1 is SEQ ID NO. 269, CDR2 is SEQ ID NO. 270 and CDR3 is SEQ ID NO. 271. In one embodiment, CDR1 is SEQ ID NO. 273, CDR2 is SEQ ID NO. 274 and CDR3 is SEQ ID NO. 275.

In one embodiment, the single V _H domain antibody comprises or consists of SEQ ID NO. 180 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 3. For example, the V _H domain comprises or consists of SEQ ID NO. 184, 188, 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252, 256, 260, 264, 268, 272 or 276. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 184, 188, 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252, 256, 260, 264, 268, 272 or 276, or a sequence with at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. CDR sequences of such sequences are listed below.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 3 or family 3-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the binding molecule capable of binding human PSMA comprises a human V _H domain comprising a family 4 or family 4-like sequence.

In one embodiment, two V _H domains comprising a family 4 or a family-4 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 4 or a family-4 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence. In one embodiment, one V _H domain comprising a family 4 or a family-4 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence.

Family 4 single V _H domain antibodies include the parent sequence and sequences of that are derived from the parent (4.1 , SEQ ID NO. 279) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 4.1 through a process of optimization, for example as shown in Figure 4. CDR sequences and full length sequences in family 4 are numbered according to Table 4 as shown below.

Table 4. This shows SEQ ID NOs of family 4 CDR sequences and of family 4 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 4. Family 4-like sequences are variants that have certain percentage sequence identity with Family 4 sequences as set out herein.

In one aspect, the invention relates to a family 4 or family 4-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 279 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 279.

In one embodiment, the V _H domain comprises a CDR3 selected from SEQ ID NOs. 279, 282, 287 or 291. In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 279 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 4 or family 4-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 277 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 278 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 279 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 277 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 278 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 279 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the CDR sequences of the V _H domain are as shown for clones 4.1 to 4.4 as in Figure 4 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 277, 281 , 285 or 289; CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 278, 282, 286 or 290 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 279, 283, 287 or 291.

In one aspect, the single V _H domain antibody has combinations of CDR1 , CDR2 and CDR3 as shown for 4.1 to 4.4 in Figure 4. Thus, in one embodiment, CDR1 is SEQ ID NO. 277, CDR2 is SEQ ID NO. 278 and CDR3 is SEQ ID NO. 279. Thus, CDR1 is SEQ ID NO. 281 , CDR2 is SEQ ID NO. 282 and CDR3 is SEQ ID NO. 283. In one embodiment, CDR1 is SEQ ID NO. 285, CDR2 is SEQ ID NO. 286 and CDR3 is SEQ ID NO. 287. In one embodiment, CDR1 is SEQ ID NO. 289, CDR2 is SEQ ID NO. 290 and CDR3 is SEQ ID NO. 291.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 280 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 4. For example, the V _H domain comprises or consists of SEQ ID NO. 280, 284, 288 or 290.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 280, 284, 288 or 290, or a sequence with at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. CDR sequences of such sequences are listed below.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 4 or family 4-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 5 or family-5 like sequence. In one embodiment, the binding molecule comprises or consists of a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA, preferably human PSMA, wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises a family 5 or family-5 sequence. In one embodiment, two V _H domains comprising a family 5 or a family-5 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 5 or a family-5 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from family 1 , 5, 6, 12 or 13 or family 1 , 5, 6, 12 or 13-like sequence.

In one embodiment, one V _H domain comprising a family 5 or a family-5 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or 14 or a family 2, 3, 4, 7, 9, 10, 1 1 or 14-like sequence. A single V _H domain antibody of family 5 includes sequences that are derived from the parent (5.1 ; SEQ ID NO. 292) or a part thereof, for example a CDR3 sequence, and to V _H sequences or parts thereof that are derived from the parent 5.1 through a process of optimization, for example as shown in Figure 5. CDR sequences and full length sequences in family 5 are numbered according to Table 5 as shown below.

Table 5. This shows SEQ ID NOs of family 5 CDR sequences and of family 5 length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 5. Family 5-like sequences are variants that have certain percentage sequence identity with Family 5-like sequences as set out herein.

In one aspect, the invention relates to a family 5 or family 5-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 295 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 295. In one embodiment, the V _H domain comprises a CDR3 selected from SEQ ID NO. 295 and 299.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence of SEQ ID NO. 295 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 5 or family-5 sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 293 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 294 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 295 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 293 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 294 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 295 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the CDR sequences of the V _H domain are as shown for clones 5.1 and 5.2 as in Figure 5 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 293 or 297, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 294 or 2984 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 295 or 299. In one aspect, the invention relates to a V _H domain which has combinations of CDR1 , CDR2 and CDR3 as shown for 5.1 to 5.2 in Figure 5. Thus, in one embodiment, CDR1 is SEQ ID NO. 293, CDR2 is SEQ ID NO. 294 and CDR3 is SEQ ID NO. 295. In one embodiment, CDR1 is SEQ ID NO. 297, CDR2 is SEQ ID NO. 298 and CDR3 is SEQ ID NO. 299.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 296 or 300 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 5. For example, the V _H domain comprises or consists of SEQ ID NO. 296 or 300.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 5 or family-5 binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 6 or family 6-like sequence.

In one aspect, the binding molecule capable of binding human PSMA comprises a human V _H domain comprising a family 6 or family 6-like sequence. In one embodiment, two V _H domains comprising a family 6 or a family-6 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 6 or a family-6 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from family 1 , 5, 6, 12 or 13 or family 1 , 5, 6, 12 or 13-like sequence.

In one embodiment, one V _H domain comprising a family 6 or a family-6 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or 14 or a family 2, 3, 4, 7, 9, 10, 1 1 or 14-like sequence. A family 6 single V _H domain antibody includes the parent (6.1 ; SEQ ID NO. 304) or a part thereof, for example a CDR3 sequence, and to V _H sequences or parts thereof that are derived from the parent 6.1 through a process of optimization, for example as shown in Figure 3. CDR sequences and full length sequences in family 6 are numbered according to Table 6 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

6.1 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 304

NO. 301 NO. 302 303 QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

NSGYY FIYYNG DGDDYGDY NSGYYWSWVRQHPGKDLEWIGFIYYNGSI

WS SIHYNP HYNPSLKSRVIISVDTSKNQFSLKMNSVTAA

SLKS DTAVYYCARDGDDYGDYLRGQGTLVTVSS

6.2 SEQ ID SEQ ID SEQ ID NO.

NO. 305 NO. 306 307 SEQ ID NO. 308

NSGYY FIYYNG DGDDYGDY QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

WS SIHYNP NSGYYWSWIRQHPGKGLEWIGFIYYNGSIH

SLKS YNPSLKSRVIISVDTSKNQFSLKMSSVTAAD

TAVYYCARDGDDYGDYLRGQGTLVTVSS

6.3 SEQ ID SEQ ID SEQ ID NO.

NO. 309 NO. 310 31 1 SEQ ID NO. 312

NSGYY FIYYNG DGDDYGDY QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

WS SIHYNP NSGYYWSWVRQHPGKGLEWIGFIYYNGSI

SLKS HYNPSLKSRVIISVDTSKNQFSLKLNSVTAA

DTAVYYCARDGDDYGDYLRGQGTLVTVSS

6.4 SEQ ID SEQ ID

NO. 313 NO. 314 SEQ ID NO. SEQ ID NO. 316

NSGYY FIYYNG 315 QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

WS SIHYNP DGDDYGDY NSGYYWSWIRQHPGKGLEWIGFIYYNGSIH

SLKS YNPSLKSRVIISVDTSKNQFSLKLSSVTAAD

TAVYYCARDGDDYGDYLRGQGTLVTVSS

6.5 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 320 NO. 317 NO. 318 319 QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

NSGYY FIYYNG DGDDYGDY NSGYYWSWVRQHPGKGLEWIGFIYYNGSI

WS SIHYNP HYNPSLKSRVTISVDTSKNQFSLKMSSVTA

SLKS ADTAVYYCARDGDDYGDYLRGQGTLVTVS

S

6.6 SEQ ID SEQ ID NO.

SEQ ID NO. 322 323 SEQ ID NO. 324

NO. 321 FIYYNG DGDDYGDY QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

NSGYY SIHYNP NSGYYWSWVRQHPGKGLEWIGFIYYNGSI

WS SLKS HYNPSLKSRVTISVDTSKNQFSLKLNSVTAA

DTAVYYCARDGDDYGDYLRGQGTLVTVSS

6.7 SEQ ID SEQ ID SEQ ID NO. SEQ ID NO. 328

NO. 325 NO. 326 327 QVQLQESGPGLVKPSQTLSLTCTVSGGSIS

NSGYY FIYYNG DGDDYGDY NSGYYWSWVRQHPGKGLEWIGFIYYNGSI

WS SIHYNP H Y N PS L KS R VT ISVDTSKNQFSL KLSS VTA A

SLKS DTAVYYCARDGDDYGDYLRGQGTLVTVSS

Table 6. This shows SEQ ID NOs of family 6 CDR sequences and of family 6 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 6. Family 6-like sequences are variants that have certain percentage sequence identity with Family 6 sequences as set out herein.

In one aspect, the invention relates to a family 6 or family 6-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 303 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 303.

In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 selected from SEQ ID NO. 303, 307, 311 , 315, 319, 323 or 327.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 303 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 6 or family 6-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 301 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 302 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 303 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 301 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO.302 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 303 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for clones 6.1 to 6.7 as in Figure 6 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 301 , 305, 309, 313, 317, 321 , 325, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 302, 306, 310, 314, 318, 322, 326 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 303, 307, 31 1 , 315, 319, 323, 327.

In one aspect, single V _H domain antibody which has combinations of CDR1 , CDR2 and CDR3 as shown for 6.1 to 6.7 in Figure 6. Thus, in one embodiment, CDR1 is SEQ ID NO. 301 , CDR2 is SEQ ID NO. 302 and CDR3 is SEQ ID NO. 303. Thus, in one embodiment, CDR1 is SEQ ID NO. 305, CDR2 is SEQ ID NO. 306 and CDR3 is SEQ ID NO. 307. In one embodiment, CDR1 is SEQ ID NO. 309, CDR2 is SEQ ID NO. 310 and CDR3 is SEQ ID NO. 31 1. In one embodiment, CDR1 is SEQ ID NO. 313, CDR2 is SEQ ID NO. 314 and CDR3 is SEQ ID NO. 315. In one embodiment, CDR1 is SEQ ID NO. 317, CDR2 is SEQ ID NO. 318 and CDR3 is SEQ ID NO. 319. In one embodiment, CDR1 is SEQ ID NO. 321 , CDR2 is SEQ ID NO. 322 and CDR3 is SEQ ID NO. 323. In one embodiment, CDR1 is SEQ ID NO. 325, CDR2 is SEQ ID NO. 326 and CDR3 is SEQ ID NO. 327. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 304 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 6. For example, the V _H domain comprises or consists of SEQ ID NO. 304, 308, 312, 316, 320, 324 or 328.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 304, 308, 312, 316, 320, 324 or 328 or a sequence with at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 6 or family 6-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 7 or family 7-like sequence.

In one aspect, the binding molecule capable of binding human PSMA comprises a human V _H domain comprising a family 7 or family 7-like sequence. In one embodiment, two V _H domains comprising a family 7 or a family-7 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 7 or a family-7 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 1 1 -like sequence.

In one embodiment, one V _H domain comprising a family 7 or a family-7 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence. A family 7 or family 7-like sequence includes the parent sequence and sequences of clones that are derived from the parent (7.1) or a part thereof, for example a CDR3 sequence, and to V _H sequences or parts thereof that are derived from the parent 7.1 through a process of optimization, for example as shown in Figure 7. CDR sequences and full length sequences in family 7 are numbered according to Table 7 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

7.1 SEQ ID NO. 329 SEQ ID NO. SEQ ID NO.

SYWMY 330 331

NINHDGSEKYYV DSLIVGERGY DSVKG SEQ ID NO. 332

EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHDGSEKYY

VDSVKGRFTISRDNAK

NSLYLQMNSLRAEDTA

VYYCARDSLIVGERGY

WGQGTLVTVSS

7.2 SEQ ID NO. 333 SEQ ID NO. 334 SEQ ID NO. SEQ ID NO.

SYWMY NINHDGSEKYYV 335 336

DSVKG DNLIVGERGY EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHDGSEKYY

VDSVKGRFTISRDNAK

NSLYLQMNSLRAEDTA

VYYCARDNLIVGERGY

WGQGTLVTVSS

7.3 SEQ ID NO. 337 SEQ ID NO. 338 SEQ ID NO. SEQ ID NO.

SYWMY NINHGGSEKYYV 339 340

DSVKG DSLIVGERGY EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHGGSEKYY

VDSVKGRFTISRDNAK

NSLYLQMNSLRAEDTA

VYYCARDSLIVGERGY

WGQGTLVTVSS

7.4 SEQ ID NO. 341 SEQ ID NO. 342 SEQ ID NO. SEQ ID NO.

SYWMY NINHQGSEKYYV 343 344

DSVKG DSLIVGERGY EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHQGSEKYY

VDSVKGRFTISRDNAK NSLYLQMNSLRAEDTA

VYYCARDSLIVGERGY WGQGTLVTVSS

7.5 SEQ ID NO. 345 SEQ ID NO. 346 SEQ ID NO. SEQ ID NO.

SYWMY NINHPGSEKYYV 347 348

DSVKG DSLIVGERGY EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVAN I N H PGSEKYYV

DSVKGRFTISRDNAKN

SLYLQMNSLRAEDTAV

YYCARDSLIVGERGY

WGQGTLVTVSS

7.6 SEQ ID NO. 349 SEQ ID NO. 350 SEQ ID NO. SEQ ID NO. 352

SYWMY NINHEGSEKYYV 351 EVQLVESGGGLVQPG

DSVKG DSLIVGERGY GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVAN I N H EGSEKYYV

DSVKGRFTISRDNAKN

SLYLQMNSLRAEDTAV

YYCARDSLIVGERGY

WGQGTLVTVSS

7.7 SEQ ID NO. 353 SEQ ID NO. 354 SEQ ID NO. SEQ ID NO. 356

SYWMY NINHIGSEKYYVD 355 EVQLVESGGGLVQPG

SVKG DSLIVGERGY GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHIGSEKYYV

DSVKGRFTISRDNAKN

SLYLQMNSLRAEDTAV

YYCARDSLIVGERGY

WGQGTLVTVSS

7.8 SEQ ID NO. 357 SEQ ID NO. 358 SEQ ID NO. SEQ ID NO.

SYWMY NINHDGSEKYYV 359 360

DSVKG DTLIVGERGY EVQLVESGGGLVQPG

GSLRLSCAASGFTFSS

YWMYWVRQAPGKGL

EWVANINHDGSEKYY

VDSVKGRFTISRDNAK

NSLYLQMNSLRAEDTA

VYYCARDTLIVGERGY

WGQGTLVTVSS

Table 7. This shows SEQ ID NOs of family 7 CDR sequences and of family 7 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 7. Family 7-like sequences are variants that have certain percentage sequence identity with Family 7 sequences as set out herein. In one aspect, the invention relates to a family 7 or family 7-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 331 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 331.

In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 selected from SEQ ID NO. 331 , 335, 339, 343, 347, 351 , 355 or 359.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 331 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 7 or family 7-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 329 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 330 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 331 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 329 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 330 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 331 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In one embodiment, the CDR sequences of the V _H domain are as shown for clones 7.1 to 7.8 as in Figure 7 or combinations thereof. In one embodiment, CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 329, 333, 337, 341 , 345, 349, 353 or 357, CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 330, 334, 338, 342, 346, 350, 354 or 358 and CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 331 , 335, 339, 343, 347, 351 , 355 or 359.

In one aspect, the single V _H domain antibody has combinations of CDR1 , CDR2 and CDR3 as shown for 7.1 to 7.8 in Figure 7. Thus, in one embodiment, CDR1 is SEQ ID NO. 329, CDR2 is SEQ ID NO. 330 and CDR3 is SEQ ID NO. 331. Thus, in one embodiment, CDR1 is SEQ ID NO. 333, CDR2 is SEQ ID NO. 334 and CDR3 is SEQ ID NO. 335. In one embodiment, CDR1 is SEQ ID NO. 337, CDR2 is SEQ ID NO. 338 and CDR3 is SEQ ID NO. 339. In one embodiment, n CDR1 is SEQ ID NO. 341 , CDR2 is SEQ ID NO. 342 and CDR3 is SEQ ID NO. 343. In one embodiment, CDR1 is SEQ ID NO. 345, CDR2 is SEQ ID NO. 346 and CDR3 is SEQ ID NO. 347. In one embodiment, CDR1 is SEQ ID NO. 349, CDR2 is SEQ ID NO. 350 and CDR3 is SEQ ID N0.351. In one embodiment, CDR1 is SEQ ID NO. 353, CDR2 is SEQ ID NO. 354 and CDR3 is SEQ ID NO. 355. In one embodiment, CDR1 is SEQ ID NO. 357, CDR2 is SEQ ID NO. 358 and CDR3 is SEQ ID NO. 359.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 332 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, homology is at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99%. CDR sequences of such sequences are shown in Figure 2. For example, the V _H domain comprises or consists of SEQ ID NO. 332, 336, 340, 344, 348, 352, 356 or 360.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 332, 336, 340, 344, 348, 352, 356, 360 or a sequence with at least 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences. The family 7 or family 7-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 8 or family 8-like sequence.

A family 8 or family 8-like sequence includes the parent sequence and sequences of clones that are derived from the parent (8.1 , SEQ ID NO. 36) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 8.1 through a process of optimization, CDR sequences and full length sequences of 8.1 in are numbered according to Table 8 as shown below.

Table 8. This shows SEQ ID NOs of family 8 CDR sequences and of family 8 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 8. Family 8-like sequences are variants that have certain percentage sequence identity with Family 8 sequences as set out herein.

In one aspect, the invention relates to a family 8 or family 8-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 363 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 363.

. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 363.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 363 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 8 or family 8-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 361 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 362 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 363 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 361 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 362 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 363 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for sdAb 8.1 as in Figure 8. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 364 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 8 or family 8-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples. In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 9 or family 9-like sequence. In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 9 or family 9-like sequence. In one embodiment, two V _H domains comprising a family 9 or a family-9 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 9 or a family-9 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence.

In one embodiment, one V _H domain comprising a family 9 or a family-9 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence. A family 9 or family 9 sequence includes the parent sequence and sequences that are derived from the parent (9.1 ; SEQ ID NO. 368) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 9.1 through a process of optimization, CDR sequences and full-length sequences of 9.1 in are numbered according to Table 9 as shown below.

Table 9. This shows SEQ ID NOs of family 9 CDR sequences and of family 9 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 9. Family 9-like sequences are variants that have certain percentage sequence identity with Family 9 sequences as set out herein. In one aspect, the invention relates to a family 9 or family 9-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 367 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 367.

In one embodiment, the binding molecule comprises at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said human V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 367 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 367. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 367.

In one embodiment, the single V _H domain antibody comprises a CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 363 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 9 or family 9-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 365 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 366 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 367 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 365 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 366 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 367 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for clone 9.1 as in Figure 9.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 368 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences. The family 9 or family 9-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 10 or family 10-like sequence.

In one embodiment, two V _H domains comprising a family 10 or a family-10 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 10 or a family-10 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence.

In one embodiment, one V _H domain comprising a family 10 or a family-10 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence. A family 10 or family 10 sequence includes the parent sequence and sequences that are derived from the parent (10.1) or a part thereof, for example a CDR3 sequence, and V _H sequences of or parts thereof that are derived from the parent 10.1 through a process of optimization, CDR sequences and full length sequences of 10.1 in are numbered according to Table 10 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence 10.1 SEQ ID NO.

SEQ ID NO. 369 SEQ ID NO. 370 371

SYGMY FMSYDGSNKY GDYDFWSGY SEQ ID NO. 372

YVDSVKG PDYD QVQLVESGGGLVQPGG

SLRLSCAASGFTFSSYG

MHWVRQAPGKGLEWV

AFMSYDGSNKYYVDSV

KGRFTISRDNSKNTLYL

Q M N S L R A E DTAVYYC A

KGDYDFWSGYPDYDM

DVWGQGTTVTVSS

Table 10. This shows SEQ ID NOs of family 10 CDR sequences and of family 10 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 10. Family 10-like sequences are variants that have certain percentage sequence identity with Family 10 sequences as set out herein.

In one aspect, the invention relates to a family 10 or family 10-like binding molecule comprising a human V _H domain comprising a CDR3 sequence comprising SEQ ID NO. 371 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 371.

In one embodiment, the family 10 or family 10-like binding molecule comprises at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said human V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 371 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 371. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 371. In one embodiment, said V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 369 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 370 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 371 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 369 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 370 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 371 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for done 10.1 as in Figure 10.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 372 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences. The family 10 or family 10-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a V _H domain comprising a family 1 1 or family 1 1 -like sequence. In one embodiment, two V _H domains comprising a family 1 1 or a family-11 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 1 1 or a family-1 1 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence. In one embodiment, one V _H domain comprising a family 11 or a family-1 1 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence.

A family 1 1 or family 11 sequence includes the parent sequence and sequences that are derived from the parent (1 1.1 , SEQ ID NO. 376) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 1 1.1 through a process of optimization, CDR sequences and full-length sequences of 1 1.1 in are numbered according to Table 1 1 as shown below.

Table 11. This shows SEQ ID NOs of family 1 1 CDR sequences and of family 1 1 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 1 1. Family 1 1 -like sequences are variants that have certain percentage sequence identity with Family 11 sequences as set out herein.

In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 375 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 375. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 375. In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 375 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 1 1 or family 1 1 -like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 373 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 374 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 375 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 373 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 374 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 375 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for sdAb 11.1 as in Figure 11.

In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 376 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 11 or family 1 1 -like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples.

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 12 or family 12-like sequence. In one embodiment, two V _H domains comprising a family 12 or a family-12 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 12 or a family-12 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from family 1 , 5, 6, 12 or 13 or family 1 , 5, 6, 12 or 13-like sequence.

In one embodiment, one V _H domain comprising a family 12 or a family-12 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or 14 or a family 2, 3, 4, 7, 9, 10, 1 1 or 14-like sequence.

A family 12 or family 12-like sequence includes the parent sequence and sequences that are derived from the parent (12.1 , SEQ ID NO. 380) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 12.1 through a process of optimization, CDR sequences and full-length sequences of 12.1 in are numbered according to Table 12 as shown below.

Name CDR1 CDR2 CDR3 V _H Full length sequence

12.1 SEQ ID NO. SEQ ID NO. 378 SEQ ID NO. SEQ ID NO. 380

377 VISYDGNSKYYAD 379 QVQLVESGGGVVQPG

NFGMH TV KG GLWPPMDV RSLRLSCAASGFTFSN

FGMHWARQAPGKGLE

WVAVISYDGNSKYYAD

TVKGRFTISRDNSKNT

LYLEMNSLRADDTAVY

YCAKGLWPPM DVRGQ

GTTVTVSS

Table 12. This shows SEQ ID NOs of family 12 CDR sequences and of family 12 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 12. Family 12-like sequences are variants that have certain percentage sequence identity with Family 12 sequences as set out herein.

In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 379 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 379. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 379.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 379 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 12 or family 12-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 377 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 378 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 379 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 377 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 378 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 379 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for clone 12.1 as in Figure 12. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 380 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 12 or family 12-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 13 or family 13-like sequence. In one embodiment, two V _H domains comprising a family 13 or a family-13 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 13 or a family-13 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from family 1 , 5, 6, 12 or 13 or family 1 , 5, 6, 12 or 13-like sequence.

In one embodiment, one V _H domain comprising a family 13 or a family-13 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or 14 or a family 2, 3, 4, 7, 9, 10, 1 1 or 14-like sequence.

A family 13 or family-like 13 sequence includes the parent sequence and sequences that are derived from the parent (13.1 , SEQ ID NO. 384) or a part thereof, for example a CDR3 sequence, and V _H sequences of clones or parts thereof that are derived from the parent 13.1 through a process of optimization, CDR sequences and full-length sequences of 13.1 in are numbered according to Table 13 as shown below.

Table 13. This shows SEQ ID NOs of family 13 CDR sequences and of family 13 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 13. Family 13-like are variants sequences that have certain percentage sequence identity with Family 13 sequences as set out herein. In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 383 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 383. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 383.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 383 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 13 or family 13-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 381 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 382 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 383 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 381 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 382 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 383 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for done 13.1 as in Figure 13. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 384 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto.

In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 13 or family 13-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 14 or family 14-like sequence. In one embodiment, two V _H domains comprising a family 14 or a family-14 like sequence may be combined for a bivalent binding molecule. In another embodiment, one V _H domain comprising a family 14 or a family-14 like sequence may be combined with a second V _H domain as described herein that binds to the same a epitope, part, domain, subunit or confirmation of PSMA for a bivalent binding molecule. The second V _H domain may be selected from a family 2, 3, 4, 7, 9, 10, 1 1 or a family 2, 3, 4, 7, 9, 10, 11 -like sequence.

In one embodiment, one V _H domain comprising a family 14 or a family-14 like sequence may be combined with a second V _H domain as described herein that binds to a different epitope, part, domain, subunit or confirmation of PSMA for a biparatopic binding molecule. The second V _H domain may be selected from a family 1 , 5, 6, 12 or 13 or a family 1 , 5, 6, 12 or 13-like sequence.

A family 14 or family 14 sequence includes the parent sequence and sequences of clones that are derived from the parent (14.1) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 14.1 through a process of optimization, CDR sequences and full-length sequences of 14.1 in are numbered according to Table 14 as shown below.

Table 14. This shows SEQ ID NOs of family 14 CDR sequences and of family 14 full-length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 14. Family 14-like sequences are variants that have certain percentage sequence identity with Family 14 sequences as set out herein. In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 387 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 387. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 387.

In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 385 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 14 or family 14-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 385 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 386 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 387 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto.

In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 385 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 386 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 387 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for clone 14.1 as in Figure 14. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 388 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 14 or family 14-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples

In one aspect, the invention relates to a binding molecule capable of binding human PSMA comprising a human V _H domain comprising a family 15 or family 15-like sequence. In one embodiment, the binding molecule comprises at least two one single V _H domain antibodies capable of binding PSMA, preferably human PSMA, of family 15 or family 15 sequence. Family 15 single V _H domain antibodies include the parent sequence and sequences that are derived from the parent (15.1) or a part thereof, for example a CDR3 sequence, and V _H sequences or parts thereof that are derived from the parent 15.1 through a process of optimization, CDR sequences and full-length sequences of 15.1 in are numbered according to Table 15 as shown below.

Table 15. This shows SEQ ID NOs of family 15 CDR sequences and of family 15 full length V _H sequences that are within the scope of the invention. Corresponding sequences are shown in Figure 15. Family 15-like sequences are variants that have certain percentage sequence identity with Family 15 sequences as set out herein.

In one embodiment, the V _H domain comprises at least one antigen binding site comprising a CDR3 sequence comprising SEQ ID NO. 391 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology to SEQ ID NO. 391. In one embodiment, homology is at least 90%. In one embodiment, the V _H domain comprises a CDR3 of SEQ ID NO. 391. In one embodiment, the single V _H domain antibody comprises at least one antigen binding site comprising hypervariable region CDR3 said CDR3 having the amino acid sequence SEQ ID NO. 391 or a sequence having at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, the family 15 or family 15-like sequence comprises a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody capable of binding PSMA wherein said domain is a human V _H domain and wherein said PSMA binding molecule comprises at least one antigen binding site comprising hypervariable regions CDR1 , CDR2 and CDR3, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 389 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 390 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto, and said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 391 or a sequence with at least 70%, at least 80%, at least 90%, or at least 95% homology thereto. In one embodiment, said CDR1 comprises or consists of the amino acid sequence SEQ ID NO. 389 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR2 comprises or consists of the amino acid sequence SEQ ID NO. 390 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, said CDR3 comprises or consists of the amino acid sequence SEQ ID NO. 391 or a sequence with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In one embodiment, the CDR sequences of the V _H domain are as shown for done 15.1 as in Figure 15. In one embodiment, the V _H domain comprises or consists of SEQ ID NO. 392 or a sequence with at least 40%, 50%, 60%, 70%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% homology thereto. In another embodiment, the V _H domain is selected from one of the sequences above, but comprises one or more amino acid substitutions, for example 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10 amino acid substitutions. In one embodiment, the one or more amino acid substitution is in one or more of the framework areas. In another embodiment, the one or more amino acid substitution is in one or more of the CDRs. In one embodiment, the amino acid substitutions are in the framework and CDR sequences.

The family 15 or family 15-like binding molecules have KD, Koff, KA, Kd, EC ₅₀ and IC ₅₀ values as further described herein and as shown in the examples In one aspect, the single V _H domain antibody comprises a CDR3 sequence selected from a family 1 or family 1-like, family 2 or family 2-like, family 3 or family 3-like, family 4 or family 4-like, family 5 or family 5-like, family 6 or family 6-like, family 7 or family 7-like, family 8 or family 8-like, family 9 or family 9-like, family 10 or family 10-like, family 1 1 or family 11-like, family 12 or family 12-like, family 13 or family 13-like, family 14 or family 14-like or a family 15 or family 15-like CDR3 sequence combined with a CDR1 and CDR2 sequence from another family listed herein.

For example, the single V _H domain antibody comprises a family 1 or family 1-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 2 to 15.

In another aspect, the single V _H domain antibody comprises a family 2 or family 2-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 , 3 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 3 or family 3-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 , 2, 4 to 15. Various combinations are possible as would be appreciated by a skilled person. In another aspect, the single V _H domain antibody comprises a family 4 or family 4-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in Table 1 any of Tables 1 to 3, 5 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 5 or family 5-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 4, 6 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 6 or family 6-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 5, 7 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 7 or family 7-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 6, 8 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 8 or family 8-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 7, 9 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 9 or family 9-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 8, 10 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 10 family 10-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 4, 1 1 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 11 or family 1 1 -like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 10, 12 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 12 or family 12-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 1 1 , 13 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 13 or family 13-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 12, 14 to 15. Various combinations are possible as would be appreciated by a skilled person.

In another aspect, the single V _H domain antibody comprises a family 15 or family 15-like CDR3 sequence combined with a CDR1 and a CDR2 sequence from one or two other families as shown in any of Tables 1 to 14. Various combinations are possible as would be appreciated by a skilled person.

The invention also relates to a binding molecule comprising a first V _H domain selected from one of the V _H domains described above and listed in any of Tables 1 to 15 linked to a second V _H domain selected from a described above and listed in any of Tables 1 to 15 wherein said first V _H domain competes for binding to PSMA with the second V _H domain in a competitive assay. The invention also relates to a binding molecule comprising a first V _H domain selected from one of the V _H domains described above and listed in any of Tables 1 to 15 linked to a second V _H domain selected from a described above and listed in any of Tables 1 to 15 wherein said first V _H domain does not compete for binding to PSMA with the second V _H domain in a competitive assay.

In preferred embodiment, the binding molecule is biparatopic or multiparatopic and comprises a first single V _H domain antibody selected from single domain antibodies 1.1 to 1.20 as shown in Table 1 , and a second single V _H domain antibody selected from 2.1 to 2.25 as shown in Table 2. For example, the first single V _H domain antibody is selected from single domain antibodies 1.1 , 1.8-1.20 as shown in Table 1 , and a second single V _H domain antibody is selected from 2.1 , 2.2, 2.11-2.19, 2.22-2.25 as shown in Table 2. In another embodiment, the binding molecule comprises a first single domain antibody selected from single domain antibodies 2.1 to 2.25 as shown in Table 2 and a second V _H single domain antibody selected from 1.1 to 1.20 as shown in Table 1. For example, the first single V _H domain antibody is selected from single domain antibodies 2.1 , 2.2, 2.1 1-2.19, 2.22-2.25 as shown in Table 2, and the second single V _H domain antibody is selected from 1.1 , 1.8-1.20 as shown in Table 1. Single domain antibodies are linked with a (G ₄ S)n linker, preferably a (G ₄ S)n. In further preferred embodiments, the binding molecules is selected from a binding molecule that comprises the following components: single V _H domain antibody- linker- single V _H domain antibody as follows:

1.1-6GS-2.1 , 1.8-6GS-2.1 , 1.1-6GS-2.17, 1.1-6GS-2.15, 1.1-6GS-2.22, 1.16-6GS-2.1 , 1.16- 6GS-2.17, 1.16-6GS-2.15, 1.16-6GS-2.22, 1.11-6GS-2.1 , 1.1 1-6GS-2.17, 1.1 1-6GS-2.15, 1.1 1-6GS-2.22, 1.18-6GS-2.1 , 1.18-6GS-2.17, 1.18-6GS-2.15, 1.18-6GS-2.22, 1.17-6GS- 2.1 , 1.17-6GS-2.17, 1.17-6GS-2.15 or 1.17-6GS-2.22.

In another embodiment, single V _H domain antibodies as described above can be replaced with

binding molecules, e.g. antibodies, antibody fragments or antibody mimetics, that bind to the same epitope on human PSMA as a single domain antibodies (i.e., antibodies that have the ability to cross-compete for binding to PSMA with any of the single domain antibodies described herein). The single domain antibodies described herein can thus be used as a reference antibody. In preferred embodiments, the reference antibody for cross-competition studies is single domain antibody 1.1 , 2.1 , 3.1 , 4.1 , 5.1 , 6.1 , 7.1 , 8.1 , 9.1 , 10.1 , 1 1.1 , 12.1 , 13.1 , 14.1 or 15.1. Such cross-competing antibodies can be identified based on their ability to cross-compete with any of single domain antibodies described herein in standard PSMA binding assays. For example, BIAcore® analysis, ELISA assays or flow cytometry may be used to demonstrate cross-competition with the single domain antibodies of the current invention. In one embodiment, the invention provides a binding agent capable of binding human PSMA wherein any one of the single domain antibodies described above displaces the binding agent in a competitive assay. A binding molecule described herein may be provided as a fusion protein with one or more additional protein moiety.

The second moiety may comprise a V _H domain that is also specific for human PSMA thus providing a bivalent binding molecule. In one embodiment, the binding molecule is biparatopic. Biparatopic binding molecules comprise antigen-binding moieties that bind to different epitopes. Biparatopic binding molecules of the present invention can be constructed using methods known art. Suitable linkers to connect the moieties of the binding molecule include peptide linker, for example linkers that include GS residues such as (Gly ₄ Ser) _n , where n=from 1 to 10, e.g., 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10. As used herein, GS designates Gly ₄ Ser. (Gly ₄ Ser) _n is also expressed as nGS herein.

In another embodiment, the binding molecule may comprise a further moiety that is specific for a different antigen to provide a bispecific binding molecule. As used herein, the term "bispecific binding molecule" thus refers to a polypeptide that comprises a binding molecule as described herein which has a binding site that has binding specificity for PSMA, and a second polypeptide domain which has a binding site that has binding specificity for a second target, i.e., the bispecific binding molecule has specificity for two targets. The first target and the second target are not the same, i.e. are different targets, e.g., proteins; both may be present on a cell surface. Accordingly, a bispecific binding molecule as described herein can selectively and specifically bind to a cell that expresses (or displays on its cell surface) the first target and the second target. In another embodiment, the binding molecule comprises more than two antigen-binding moieties.

In another embodiment, more than two moieties are joined together providing a multispecific binding molecule. A multispecific polypeptide agent as described herein can in addition to binding PSMA bind one or more additional targets, i.e. , a multispecific polypeptide can bind at least two, at least three, at least four, at least five, at least six, or more targets, wherein the multispecific polypeptide agent has at least two, at least, at least three, at least four, at least five, at least six, or more target binding sites respectively.

As used herein, the term "target" refers to a biological molecule (e.g., antigen, peptide, polypeptide, protein, lipid, carbohydrate) to which a polypeptide domain which has a binding site can selectively bind. The target can be, for example, an intracellular target (such as an intracellular protein target) or a cell-surface target (such as a membrane protein, e.g., a receptor protein). Preferably, a target is a cell-surface target, such as a cell-surface protein. Preferably, the first cell-surface target and second cell-surface target are both present on a cell. In one embodiment, the target is an immunooncology target.

Multispecific antibodies of the present invention can be constructed using methods known art.

If desired, bispecific or multispecific binding molecules can be linked to an antibody Fc region or fragment thereof, comprising one or both of C _H 2 and C _H 3 domains, and optionally a hinge region. For example, vectors encoding bispecific or multispecific binding molecules linked as a single nucleotide sequence to an Fc region or fragment thereof can be used to prepare such polypeptides. In one embodiment, the further moiety may serve to prolong the half-life of the binding molecule. The second moiety may comprise a protein, for example and antibody, or part thereof that binds a serum albumin, e.g., human serum albumin (HSA) or mouse serum albumin (MSA). The further moiety may comprise a V _H domain that binds serum albumin, e.g., human serum albumin (HSA) or mouse serum albumin (MSA).

The further moiety may comprise a serum albumin, e.g. a human serum albumin (HSA) or a variant thereof such as HSA C34S. Further provided is binding molecule as described herein comprising a V _H domain and an Fc domain, e.g., wherein the V _H domain is fused to an Fc domain. Further provided is a binding molecule that comprises a second variable domain that specifically binds a second antigen, where the second antigen is an antigen other than human PSMA. The second antigen may be a cluster of differentiation (CD) molecule or a Major Histocompatibility Complex (MHC) Class II molecule.

In one embodiment, the binding molecule of the invention is labelled with a detectable or functional label. A label can be any molecule that produces or can be induced to produce a signal, including but not limited to fluorescers, radiolabels, enzymes, chemiluminescers, a nuclear magnetic resonance active label or photosensitizers. Thus, the binding may be detected and/or measured by detecting fluorescence or luminescence, radioactivity, enzyme activity or light absorbance.

In still other embodiments, the binding molecule of the invention is coupled to at least one therapeutic moiety, such as a drug, an enzyme or a toxin. In one embodiment, the therapeutic moiety is a toxin, for example a cytotoxic radionuclide, chemical toxin or protein toxin. For example, the PSMA binding molecule of the invention, can be coupled to a radioactive isotope such as an α-, β-, or γ-emitter, or a β- and γ-emitter.

The toxin may be selected from calicheamicin, esperamicin, methotrexate, doxorubicin, melphalan, chlorambucil, ARA-C, vindesine, mitomycin C, cis-platinum, etoposide, bleomycin, 5-fluorouracil, estramustine, vincristine, etoposide, doxorubicin, paclitaxel, docetaxel, dolastatin 10, auristatin E and auristatin PHE. In other embodiments, the therapeutic moiety is an immunostimulatory or immunomodulating agent.

In one aspect, the invention provides an immunoconjugate comprising more than one single V _H domain antibody described herein. Toxin-conjugated forms of the PSMA binding molecules of the present invention preferably mediate specific cell killing of PSMA-expressing cells at picomolar concentrations.

In another aspect, the PSMA binding molecules of the invention are modified to increase half-life, for example by a chemical modification, especially by PEGylation, or by incorporation in a liposome or using a serum albumin protein.

In one embodiment, the binding molecule of the invention is covalently modified. The term "covalently modified/covalent modification" includes modifications of a binding molecule according to the present invention, e.g., of a specified sequence herein; with an organic proteinaceous or non-proteinaceous derivatizing agent, fusions to heterologous polypeptide sequences, and post-translational modifications. Covalent modified polypeptides, e.g., of a specified sequence, still have the functional properties described herein, for example the ability to bind the human PSMA or, Covalent modifications are generally introduced by reacting targeted amino acid residues with an organic derivatizing agent that is capable of reacting with selected side chains or terminal residues, or by harnessing mechanisms of post-translational modifications that function in selected recombinant host cells. Certain post- translational modifications are the result of the action of recombinant host cells on the expressed polypeptide. Glutaminyl and asparaginyl residues are frequently post- translationally deamidated to the corresponding glutamyl and aspartyl residues. Alternatively, these residues are deaminated under mildly acidic conditions. Other post-translational modifications include hydroxylation of proline and lysine, phosphorylation of hydroxyl groups of seryl, tyrosine or threonyl residues, methylation of the [alpha]-amino groups of lysine, arginine, and histidine side chains. Covalent modifications, e.g., include fusion proteins comprising a PSMA binding molecule according to the present invention, e.g., of a specified sequence and their amino acid sequence variants, such as immunoadhesins, and N-terminal fusions to heterologous signal sequences.

The binding molecules of the invention have certain functional properties as further described below. These and other pharmacological activities of the binding molecules of the invention may be demonstrated in standard test methods for example as described in the art.

The binding molecules of the invention can be internalised into a cell along with the prostate- specific membrane antigen. Binding molecules of the invention bind specifically to epitopes on the extracellular domain of human PSMA. In one embodiment, binding molecules of the invention specifically bind PSMA in its dimeric form. Binding molecules of the invention can be conjugated to a toxic moiety and used to ablate or kill PSMA-expressing prostatic or cancerous cells. Binding molecules of the invention can bind live cells, such as a tumor cell or a prostate cell, such as human PSMA expressing CHO cells, LNCaP cells as shown in the examples and accompanying Tables. In a further aspect, the present invention provides single domain antibodies that bind to PSMA with an EC50 value of between 100 nM and 100 pM, such as at an average EC50 value of 100nM or less, even more preferably at an average EC50 value of 90 nM or less, such as less than 80, 70, 60, 50, 40, 30, 20, 10, 5 nM or even less, such as less than 4, 3, 2, or 1 nM or even less, such as less than 500, 400, 300, 200, 100 pM, or even less, such as less than 4 pM, preferably as measured in a FMAT binding assay. In particular, EC50 values are shown in Table 19. In one embodiment, binding molecules of the invention are capable of binding specifically to human PSMA and to cynomolgus monkey PSMA.

Potency is normally expressed as an IC ₅₀ value, in nM unless otherwise stated. In functional assays, IC ₅₀ is the concentration of a binding member that reduces a biological response by 50% of its maximum. IC ₅₀ may be calculated by plotting % of maximal biological response as a function of the log of the binding member concentration, and using a software program to fit a sigmoidal function to the data to generate IC ₅₀ values. Methods for measuring IC ₅₀ are well known in the art. For example, to determine the IC ₅₀ , a HIS ZAP Cell Killing assay may be employed to determine IC ₅₀ . EC ₅₀ designates the half maximal effective concentration.

In another aspect, the invention relates to a binding molecule comprising or consisting of at least one immunoglobulin single domain antibody directed against PSMA, preferably human PSMA, wherein said domain is a human V _H domain and has an IC ₅₀ of about 0.2 to about 1000 nM or more, for example 0.2 to 900, 0.2 to 800, 0.2 to 700, 0.2 to 600, 0.2 to 500, 0.2 to 400, 0.2 to 300, 0.2 to 200, 0.2 to 100, 0.2 to 50, 0.2 to 40, 0.2 to 30, 0.2 to 20, 0.2 to 10, 0.2 to 9, 0.2 to 8, 0.2 to 7, 0.2 to 6, 0.2 to 5, 0.2 to 4, 0.2 to 3, 0.2 to 2 or 0.2 to 1 when tested as described in the examples.

Additionally, binding kinetics and affinity (expressed as the equilibrium dissociation constant, KD) of PSMA binding molecules of the invention for binding PSMA may be determined, e.g., using surface plasmon resonance such as BIAcore® or Octet, or KD may be estimated from pA2 analysis. In particular, the molecules of the invention are very potent (i.e., EC50 values as measured, e.g., in the experimental part in the pM range). In a further aspect, the present invention provides a single domain antibody as described herein, wherein said sdAb binds to said PSMA with an average KD value of between 100 nM and 10 pM, such as at an average KD value of 90 nM or less, even more preferably at an average KD value of 80 nM or less, such as less than 70, 60, 50, 40, 30, 20, 10, 5 nM or even less, such as less than 4, 3, 2, or 1 nM, such as less than 500, 400, 300, 200, 100, 90, 80, 70, 60, 50, 40, 30, 20 pM, or even less such, as less than 10 pM. Preferably, the KD is determined as shown in the examples.

In one embodiment, a binding molecule according to the invention has a binding affinity to PSMA with an affinity constant of at least about 10 ⁷ M ^"1 , preferably about 10 ⁹ M ^"1 , and more preferably, about 10 ¹⁰ M ^"1 to 10 ¹¹ M ^"1 or higher. In one embodiment, a binding molecule according to the invention has a Kon of 1.00E+04 to 1.00E+6 (1/Ms). In one embodiment, a binding molecule according to the invention has Koff of 1.00E-03 to 1.00E-05 (1/s).

Binding molecules of the invention have shown excellent stability, including heat and serum stability (see examples). Furthermore, binding molecules of the invention show rapid tumor targeting as shown in the examples. Furthermore, binding molecules of the invention also show high specificity for human PSMA and low uptake in non-target tissues (see examples).

In one embodiment, binding molecules of the invention show fast blood clearance. In one embodiment, binding molecules of the invention show low renal retention. In one embodiment, binding molecules can inhibit, e.g., competitively inhibit, the binding of another antibody e.g., J591 , to human PSMA.

In one embodiment, a binding molecule of the invention may have one or more property select from the following non-limiting list:

a) high-affinity binding to human and/or cynomolgus prostate-specific membrane antigen in its native form occurring on the surface of tumor cells,

b) internalization by a tumor cell,

c) low uptake in non-target tissues,

d) rapid tumor targeting,

e) binding strongly to LNCaP cells, but not or only minimally to cells which lack expression of prostate-specific membrane antigen and/or

f) binding to a unique epitope on PSMA.

The present invention further provides an isolated nucleic acid encoding a binding molecule of the present invention. Nucleic acid may include DNA and/or RNA. In one aspect, the present invention provides a nucleic acid that codes for a CDR or set of CDRs or a V _H domain as defined above. The nucleic acid of the single domain antibodies described herein are set out below. These can be combined using linkers described herein to generate a nucleic acid construct for expression. Sequences comprising or consisting of SEQ ID NOs. 393 to 410 as shown below which encode V _H domains of family 1 comprising or consisting of SEQ ID NO. 4 to 80.

SEQ ID NO. 393 (encodes V _H domain 1.1)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCATGAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATGATGGTACCACA GACTACGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAGTAT GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 394 (encodes V _H domain 1.2)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCAGTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGATAATAATAATAGCACA GAGTACGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAGCA CGCTGTATCTGCAAATGAACAGCCTGAGCGCCGAGGACACGGCCGTATATTACTGTGT GAAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACTGTCTCTTCA SEQ ID NO. 395 (encodes V _H domain 1.3)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTTAGCAGTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGACTGGAGTGGGTCTCAAGTATTGGTGATAATAATAATAGCACA GACTACGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAGTA CGCTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATATTACTGTGT GAAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACTGTCTCCTCA SEQ ID NO. 396 (encodes V _H domain 1.4)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCAGTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGATGGAACCACATACTAC GCAGACTCCGTGAAGGGCCGTTTCACCATCTCCAGAGACAATTCCAAGAGCACGCTGT ATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATATTACTGTGCGAAAGAT GGTGTCCACTGGGGCCAGGGAACCCTGGTCACTGTCTCCTCA SEQ ID NO. 397 (encodes V _H domain 1.5)

GAAGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCACTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAAAATGATCGAACCACA TACTACGTAGACTCCGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAGCAC GCTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATATTACTGTGCG AAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACTGTCTCTTCA SEQ ID NO. 398 (encodes V _H domain 1.6)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCAGTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGATAATAATAGAACCACA TACTACGCAGACTCCGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAGCA CGCTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATATTACTGTGC GAAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 399 (encodes V _H domain 1.7)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGCAGTTATGCCATGAGCTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGATGGAACCACATACTAC GCAGACTCCGTGAAGGGCCGGTTCACCATCTCCAGAGACAATTCCAAGAGCACGCTGT ATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCCGTATATTACTGTGCGAAAGAT GGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 400 (encodes V _H domain 1.8)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCATGAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATGATGGTACCACA GACTACGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 401 (encodes V _H domain 1.9)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGATACCACA GACTACGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 402 (encodes V _H domain 1.10)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGCTACCACA GACTACGCAGACTTCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA

AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA

SEQ ID NO. 403 (encodes V _H domain 1.1 1)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGCTACCACA GACTACGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATA CGCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTG AAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCASEQ ID NO. 404 (encodes V _H domain 1.12)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGCTACCACA GACTACGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATA CGCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTG AAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 405 (encodes V _H domain 1.13)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACCATACCACA GACTACGCAGCCGACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATA CGCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTG AAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 406 (encodes V _H domain 1.14)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGCTACCACA GACTACGCAGACGTCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 407 (encodes V _H domain 1.15)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACCATACCACA GACTACGCAGCCTTCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 408 (encodes V _H domain 1.16)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACCATACCACA GACTACGCAGACACCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 409 (encodes V _H domain 1.17)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGATACCACA GACTACGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATA CGCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTG AAAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 410 (encodes V _H domain 1.18)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGCTACCACA GACTACGCAGCCTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 41 1 (encodes V _H domain 1.19)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACGATACCACA GACTACGCAGCCTACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA SEQ ID NO. 412 (encodes V _H domain 1.20)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGTTTTAGCAGCTATGCCCTCAGTTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTCTCAAGTATTGGTGAGAATAACCATACCACA GACTACGCAGCCACCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGTCGAGGACACGGCCGTCTATTACTGTGTGA AAGATGGTGTCCACTGGGGCCAGGGAACCCTGGTCACCGTCTCCTCA

SEQ ID NOs. 413 to 437 as shown below encode V _H domains of family 2 comprising or consisting of SEQ ID NO. 84 to 180. SEQ ID NO. 413 (encodes V _H domain 2.1)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGGAAGTAATAAAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 414 (encodes V _H domain 2.2)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGGAAGTAATAAAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 415 (encodes V _H domain 2.3)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAGCTTCAGTGGCTATGGCATGCACTGGGTCCGCC AGGCTCCAGGCAAGGGGCTGGAGTGGGTGGCACATATATCATATGATGGAAGTAATAG ATACTATGCAGAATCCGTGAAGGGCCGATTCACCATCTCCAGAGAGAATTCCAAGAACA CGCTGTCTCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGC GAAAGATCCGGCCTGGGGATTACGTTTGGGGGAGTTATCGTCCTATGATTTTGACATTT GGGGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 416 (encodes V _H domain 2.4)

CAGGTCACCTTGAAGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAAA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTCTCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCG AGAGATCCGGCCTGGGGATTACGTTTGGGGGAGTTATCGTCCTATGATTTTGAAATCTG GGGCCAAGGGACAATGGTCACCGTCTCCTCA SEQ ID NO. 417 (encodes V _H domain 2.5)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC ACTGTCTCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAGTTATCGTCCTATGATTTTGAAATTTGG GGCCAAGGGACAATGGTCACCGTCTCTTCA SEQ ID NO. 418 (encodes V _H domain 2.6)

GAAGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAAA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTATATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAACTATCGTCCTATAAATTTGAAATCTGG GGCCAAGGGACAATGGTCACCGTCTCTTCA SEQ ID NO. 419 (encodes V _H domain 2.7)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCACTTATATCATATGATGGAAGTAATAAAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGCAATCGTCCTATGCTTTTGATATCTGGG GCCAAGGGACAATGGTCACCGTCTCCTCA SEQ ID NO. 420 (encodes V _H domain 2.8)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGTCAGTTATATCATATGATGGAAGTAATAAAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAACTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGCAATCGTCCTATGCTTTTGAAATCTGGG GCCAAGGTACAATGGTCACCGTCTCCTCA SEQ ID NO. 421 (encodes V _H domain 2.9)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAAA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGTTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAGCAATCGTCCTATGCTTTTGAAATCCGG GGCCAGGGGACAACGGTCACCGTCTCTTCA

SEQ ID NO. 422 (encodes V _H domain 2.10) GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATATATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAAGAC GCTGTCTCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCG AAAGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCATATGATTTTGATATCTG GGGCCAAGGGACAATGGTCACCGTCTCCTCA SEQ ID NO. 423 (encodes V _H domain 2.11)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCCTCCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGACGAGAGTAATAAAT ACTATGCACCCAGCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACCGTCTCCTCA SEQ ID NO. 424 (encodes V _H domain 2.12)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATAAGAGTAATAAAT ACTATGCAGACAAGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 425 (encodes V _H domain 2.13)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCCTCCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGCGAGTAATAAAT ACTATGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 426 (encodes V _H domain 2.14)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCGTGCACTGGGTCCGCC AGGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGCGAGTAATAAA TACTATGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGG

GGCCAAGGGACAATGGTCACTGTCTCTTCA

SEQ ID NO. 427 (encodes V _H domain 2.15)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCCTCCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATAAGAGTAATAAAT ACTATGCAGACAAGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA

SEQ ID NO. 428 (encodes V _H domain 2.16)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA

CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCGCGCACTGGGTCCGC C

AGGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATAAGAGTAATA AA TACTATGCAGACAAGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGG GGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 429 (encodes V _H domain 2.17)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGCGAGTAATAAAT ACTATGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 430 (encodes V _H domain 2.18)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCCAGCACTGGGTCCGCC AGGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGCGAGTAATAAA TACTATGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGG GGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 431 (encodes V _H domain 2.19)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCTTCCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGATGCGAGTAATAAAT ACTATGCAGACAACGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA

SEQ ID NO. 432 (encodes V _H domain 2.20)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA

CTCTCCTGTGCAGCCTCTGGATTCAGCTTCAGTGGCTATGGCATGCACTGGGTCCGC C

AGGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAATTATATCATATGATGGAAGTAATA G ATACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACA CGCTGTCTCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGC GAAAGATCCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGAAATTT GGGGCCAAGGGACAATGGTCACCGTCTCCTCA SEQ ID NO. 433 (encodes V _H domain 2.21)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAAA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTCTCTACAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGATCCGGCCTGGGGATTACGTTTGGGGAAATTATCGTCCTATGATTTTGAAATCTGG GGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 434 (encodes V _H domain 2.22)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCACGCACTGGGTCCGCC AGGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGACGGGAGTAATAA ATACTATGCAGCCCCGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACA CGCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGC GAAAGACGCGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCT GGGGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 435 (encodes V _H domain 2.23)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCACGCACTGGGTCCGCC AGGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGACGAGAGTAATAAA TACTATGCATCCAGCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGACCGGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGG GGCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 436 (encodes V _H domain 2.24)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGACGAGAGTAATAAAT ACTATGCAAGGCTGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGACACGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGGG GCCAAGGGACAATGGTCACTGTCTCTTCA SEQ ID NO. 437 (encodes V _H domain 2.25)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCTCCTTCAGTGGCTATGGCCTCCACTGGGTCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCATATATATCATATGACCTGAGTAATAAAT ACTATGCAAGGGGGGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGACGTGGCCTGGGGATTACGTTTGGGGGAGTCATCGTCCTATGATTTTGATATCTGG GGCCAAGGGACAATGGTCACTGTCTCCTCA

In one aspect, the invention also relates to nucleic acid sequences comprising or consisting of SEQ ID NOs. 438 to 461 as shown below which encode V _H domains of family 3 comprising or consisting of SEQ ID NO. 184 to 276.

SEQ ID NO. 438 (encodes V _H domain 3.1)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATGACATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGATGAGGACACGGCTCTATATTACTGTGCGA GAGATCGTATAGTGGGAGGTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGAC AATGGTCACCGTCTCTTCA SEQ ID NO. 439 (encodes V _H domain 3.2)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATATCATATGATGGAAGTAATAAAT ATTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAAAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGAA AGATCGTATAGTGGGAGCCAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA

SEQ ID NO. 440 (encodes V _H domain 3.3) GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCCTCATTAGCTATGGCATGAACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATATCATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATAGTGGGAGCTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 441 (encodes V _H domain 3.4)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGCGGTCCAGCCTGGGAGGTCCCTGAG ACTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCC AGGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAG ATATTATGCAGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACA CGCTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCG AAAGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGA CAATGGTCACCGTCTCCTCA

SEQ ID NO. 442 (encodes V _H domain 3.5)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA

CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGC CA

GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAG AT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 443 (encodes V _H domain 3.6)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 444 (encodes V _H domain 3.7)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGGACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA

ATGGTCACTGTCTCTTCA

SEQ ID NO. 445 (encodes V _H domain 3.8)

GAAGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAGGGAACC CTGGTCACTGTCTCCTCA

SEQ ID NO. 446 (encodes V _H domain 3.9)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA

CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGC CA

GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATATCATATGATGGAAGTAATAG AT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCTTCA SEQ ID NO. 447 (encodes V _H domain 3.10)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACTGTCTCCTCA SEQ ID NO. 448 (encodes V _H domain 3.1 1)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACTGTCTCCTCA SEQ ID NO. 449 (encodes V _H domain 3.12)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA

SEQ ID NO. 450 (encodes V _H domain 3.13)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA

CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGC CA

GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAG AT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACTGTCTCCTCA SEQ ID NO. 451 (encodes V _H domain 3.14)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGTGTGGTACGGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACTGTCTCCTCA SEQ ID NO. 452 (encodes V _H domain 3.15)

GAAGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 453 (encodes V _H domain 3.16)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTCATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 454 (encodes V _H domain 3.17)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAAACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 455 (encodes V _H domain 3.18)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGACTGGGTGGCATTTATAACATATGATGGAAGTAATAGAT ACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTTTATCTGCAAATGAACAGCCTGAAACCTGAGGACACGGCTGTATATTACTGTGCGAA AGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACA ATGGTCACCGTCTCCTCA SEQ ID NO. 456 (encodes V _H domain 3.19)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATGACATATGATGGAAGTAATAGA TACTATGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA GAGATCGTATAGTGGGAGGTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGAC AATGGTCACCGTCTCTTCA SEQ ID NO. 457 (encodes V _H domain 3.20)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTCAGACATATGATGGCAGTAATAGA TACTATGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA GAGATCGTATAGTGGGAGGTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGAC AATGGTCACCGTCTCTTCA SEQ ID NO. 458 (encodes V _H domain 3.21)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTCAGACATATGATGGCAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA GAGATCGTATAGTGGGAGGTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGAC AATGGTCACCGTCTCTTCA SEQ ID NO. 459 (encodes V _H domain 3.22)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTCAGACATATGATGCCAGTAATAGA TACTATGCAGACGCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA GAGATCGTATAGTGGGAGGTAGGGTCCCTGATGCTTTTGATATCTGGGGCCAAGGGAC AATGGTCACCGTCTCTTCA SEQ ID NO. 460 (encodes V _H domain 3.23)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATAACATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTTTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTATATTACTGTGCGA AAGATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGAC AATGGTCACTGTCTCCTCA SEQ ID NO. 461 (encodes V _H domain 3.24)

AGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGAC TCTCCTGTGCAGCCTCTGGATTCCCCTTAATTAGCTATGGCATGAATTGGGTCCGCCAG GCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATAACATATGATGGAAGTAATAGATA CTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACGC TTTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTATATTACTGTGCGAAA GATCGTATTGTGGGAGCTAGGGTCCCTGATGCTTATGATATCTGGGGCCAAGGGACAAT GGTCACTGTCTCCTCA

SEQ ID NOs. 4462, 463, 464 and 465 as shown below encode V _H domains of family 4 comprising or consisting of SEQ ID NO. 280 to 292.

SEQ ID NO. 462 (encodes V _H domain 4.1)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCTTGAGA CTCTCCTGTGTAGCCTCTGGATTCCCCTTCATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCGGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTGTATTATTGTGCGA AAGAGAGGATTTTTGGAGTGCTTACCCCTGATGATTTTGATATCTGGGGCCAAGGGACA ACGGTCACCGTCTCCTCA SEQ ID NO. 463 (encodes V _H domain 4.2)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTCATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTGTATTACTGTGCGA AAGAGAGGATTTTTGGAGTGCTTACCCCTGATGATTTTGATATCTGGGGCCAAGGGACA ACGGTCACTGTCTCCTCA SEQ ID NO. 464 (encodes V _H domain 4.3)

GAGGTGCAGCTGTTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCCCCTTCATTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAGCTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTGTATTATTGTGCGA AAGAGAGGATTTTTGGCGTGCTTACCCCTGATGATTTTGAAATCTGGGGCCAAGGGACA ACGGTCACCGTCTCCTCA SEQ ID NO. 465 (encodes V _H domain 4.4)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTCACTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAGA TACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACAC GCTGTATCTGCAAATGAACAGCCTGAGACCTGAGGACACGGCTGTGTATTACTGTGCGA AAGAGAGGATTTTTGGAGCGCTTACCCCTGATGATTTTGATATCTGGGGCCAAGGGACA ACGGTCACCGTCTCTTCA SEQ ID NOs. 466 or 467 as shown below encode V _H domains of family 5 comprising or consisting of SEQ ID NO. 296 and 300.

SEQ ID NO. 466 (encodes V _H domain 5.1)

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTCAATAACTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAATTATATCATATGATGGAAATACTAAAT ATTATACAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAATAGCCTGAGAGTTGAGGACACGGCTGTGTATTACTGTGCGAA AGGTTTATGGCCTTCGGACGTCTGGGGCCAAGGGACCACGGTCACTGTCTCTTCA SEQ ID NO. 467 (encodes V _H domain 5.2)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTCAATAACTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAATTATATCATATGATGGAAATAGTAAAT ATTATACAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGCAAATGAATAGCCTGAGAGTTGAGGACACGGCTGTGTATTACTGTGCGAA AGGTTTATGGCCTTCGGACGTCTGGGGCCAAGGGACCACGGTCACCGTCTCCTCA SEQ ID NOs. 468 to 474 as shown below encode V _H domains of family 6 comprising or consisting of SEQ ID NO. 304 to 328.

SEQ ID NO. 468 (encodes V _H domain 6.1)

CAGGTGCAGCTACAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCCC TCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGGTC CGCCAGCACCCAGGGAAGGACCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGCA TCCACTACAACCCGTCCCTCAAGAGTCGAGTTATCATATCAGTAGACACGTCTAAGAAC CAGTTCTCCCTGAAAATGAACTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGTGC GAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACCGT CTCCTCA

SEQ ID NO. 469 (encodes V _H domain 6.2)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGAT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTATCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAAATGAGCTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGTG CGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACCG TCTCCTCA

SEQ ID NO. 470 (encodes V _H domain 6.3)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGGT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTATCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAACTGAACTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGTG CGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACCG TCTCCTCA SEQ ID NO. 471 (encodes V _H domain 6.4)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGAT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTATCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAACTGAGCTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGT GCGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA SEQ ID NO. 472 (encodes V _H domain 6.5)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGGT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTACCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAAATGAGCTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGTG CGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACCG TCTCCTCA

SEQ ID NO. 473 (encodes V _H domain 6.6)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGGT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTACCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAACTGAACTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGTG CGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACCG TCTCCTCA

SEQ ID NO. 474 (encodes V _H domain 6.7)

CAGGTGCAGCTGCAGGAGTCGGGCCCAGGACTGGTGAAGCCTTCACAGACCCTGTCC CTCACCTGCACTGTCTCTGGTGGCTCCATCAGCAATAGTGGTTATTACTGGAGCTGGGT CCGCCAGCACCCAGGGAAGGGCCTGGAGTGGATTGGGTTCATCTATTACAATGGGAGC ATCCACTACAACCCGTCCCTCAAGAGTCGAGTTACCATATCAGTAGACACGTCTAAGAA CCAGTTCTCCCTGAAACTGAGCTCTGTGACTGCCGCGGACACGGCCGTGTATTACTGT GCGAGAGACGGGGATGACTACGGTGACTACTTGAGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA SEQ ID NOs. 475 to 482 as shown below w encode V _H domains of family 7 comprising or consisting of SEQ ID NO. 332 to 360.

SEQ ID NO. 475 (encodes V _H domain 7.1)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACGATGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATTCCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA SEQ ID NO. 476 (encodes V _H domain 7.2)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACGATGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATAACCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA

SEQ ID NO. 477 (encodes V _H domain 7.3)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACGGGGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATTCCCTTATAGTGGGAGAGAGGGGCTACT SEQ ID NO. 478 (encodes V _H domain 7.4)

GGGGCCAGGGAACCCTGGTCACCGTCTCCTCA GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACCAGGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATTCCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA

SEQ ID NO. 479 (encodes V _H domain 7.5)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACCCCGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATTCCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA SEQ ID NO. 480 (encodes V _H domain 7.6)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACGAGGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATTCCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA SEQ ID NO. 481 (encodes V _H domain 7.7)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACATCGGAAGTGAGAAA TACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACTC ACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGCG AGAGATTCCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCACC GTCTCCTCA

SEQ ID NO. 482 (encodes V _H domain 7.8)

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTAGCTATTGGATGTACTGGGTCCGCCA GGCTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAATCACGATGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTGTATCTGCAAATGAACAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGCGC GAGAGATACCCTTATAGTGGGAGAGAGGGGCTACTGGGGCCAGGGAACCCTGGTCAC CGTCTCCTCA

SEQ ID NO. 483 as shown below encodes a V _H domain of family 8 comprising or consisting of SEQ ID NO. 364.

SEQ ID NO. 483

CAGGTGCAGCTACAGCAGTGGGGCGCAGGACTGTTGAAGCCTTCGGAGACCCTGTCC CTCACCTGCGCTGTCTATGGTGGGTCCTTCAGTGGTTACTACTGGAGCTGGATCCGCCA GCCCCCAGGGAAGGGGCTGGAGTGGATTGGGGAAATCAATCATAGTGGAAGCACCAAC TACAACCCGTCCCTCAAGAGTCGAGTCACCATATCAGTAGACACGTCCAAGAACCAGTT CTCCCTGAAGCTGAGCTCTGTGACCGCCGCGGACACGGCTGTGTATTACTGTGCGAGA GGCCCCATACCAGCCACTGCTATACCCGATGCTTTTGATATCTGGGGCCAAGGGACAAT GGTCACTGTCTCCTCA

SEQ ID NO. 484 as shown below encodes a V _H domain of family 9 comprising or consisting of SEQ ID NO. 368.

SEQ ID NO. 484

GAGGTGCAGCTACAGCAGTGGGGCGCAGGACTGTTGAAGCCTTCGGAGACCCTGTCC CTCACCTGCGCTGTCTATGGTGGGTCCTTCAGTGGTCACTACTGGAGCTGGATCCGCC AGCCCCCAGGGAAGGGGCTGGAGTGGATTGGGGACATAAATCATAGTGGAAGCACCAA CTACAACCCGTCCCTCAAGAGTCGAGTCACCATATCAGTAGACACGTCCAAGAATCAGT TCTCCCTGAAGCTGAGCTCTGTGACCGCCGCGGACACGGCTGTGTATTACTGTGTGAG AGACTACGGTGACTCCCGTAGCCTTTTTGACTACTGGGGCCAGGGAACCCTGGTCACC GTCTCTTCA SEQ ID NO. 485 as shown below encodes a V _H domain of family 10 comprising or consisting of SEQ ID NO. 372.

SEQ ID NO. 485

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTACAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTCAGTAGCTATGGCATGCACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCATTTATGTCATATGATGGCAGTAATAAA TACTATGTAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTATCTGCAAATGAACAGCCTGAGAGCTGAGGACACGGCTGTGTATTACTGTGCGA AAGGCGATTACGATTTTTGGAGTGGTTACCCCGACTACGATATGGACGTCTGGGGCCAA GGGACCACGGTCACCGTCTCCTCA

SEQ ID NO. 486 as shown below encode a V _H domain of family 1 1 comprising or consisting of SEQ ID NO. 376.

SEQ ID NO. 486

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTTGGTCAAGCCTGGAGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCAACTTGATTAGCTATGGCATGTACTGGGTCCGCCA GGCTCCAGGCAAGGGGCTGGAGTGGGTGGCAGTTATATCATATGATGGAAGTAATAAA AACTATGCAGACTCCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAATAC GCTGTTTCTGCAAATGAACAGCCTGAGAGTTGAGGACACGGCTGTGTATTACTGTGCGA AAGGGGGGAATGCCTTGTATAGCAGTGGCTGGCCCGATGATGGTTTTGATATCAGGGG CCAAGGGACAATGGTCACTGTCTCCTCA

SEQ ID NO. 487 as shown below encode a V _H domain of family 12 comprising or consisting of SEQ ID NO. 380.

SEQ ID NO. 487

CAGGTGCAGCTGGTGGAGTCTGGGGGAGGCGTGGTCCAGCCTGGGAGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTCAGTAACTTTGGCATGCACTGGGCCCGCCA GGCTCCAGGCAAGGGACTGGAGTGGGTGGCAGTAATATCATATGATGGAAATAGTAAAT ACTATGCAGACACCGTGAAGGGCCGATTCACCATCTCCAGAGACAATTCCAAGAACACG CTGTATCTGGAAATGAACAGCCTGAGAGCTGATGACACGGCTGTGTATTACTGTGCGAA AGGCCTATGGCCCCCAATGGACGTCAGGGGCCAAGGGACCACGGTCACCGTCTCCTC A

SEQ ID NO. 488 as shown below encode a V _H domain of family 13 comprising or consisting of SEQ ID NO. 384.

SEQ ID NO. 488

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGCTCGGTCCAGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTAGTGACTATTGGATGACCTGGGTCCGCCA GGTTCCAGGGAAGGGGCTGGAGTGGGTGGCCAACATAAAGCAAGATGGAAGTGAGAA ATACTATGTGGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACT CACTATATCTGCAAATGAATAGCCTGAGAGCCGAGGACACGGCTGTGTATTACTGTGCG AGAGATCGAGGAGGAGCAGTGGCCCTTTATCACAACGGTATGGACATGGGGGGCCAAG GGACCACGGTCACTGTCTCTTCA

SEQ ID NO. 4899 as shown below encode a V _H domain of family 14 comprising or consisting of SEQ ID NO. 388.

SEQ ID NO. 489

GAAGTGCAGCTGGTGGAGTCTGGGGGAGGTGAAGAAGCCTGGGGCCTCAGTGAAGGT CTCCTGCAAGGCTTCTGGATACACCTTCACCAGTTATGATATCAACTGGGTGCGACAGG CCACTGGACAAGGGCTTGAGTGGATGGGATGGATGAACCCTAACAGTGGTAACACAGG CTATGCACAGAAGTTCCAGGGCAGAGTCACCATGACCAGGAACACCTCCATAAGCACA GCCTACATGGAGCTGAGCAGCCTGAGATCTGAGGACACGGCCGTGTATTACTGTGCGA GAGGGAACGGGCCCGGTATAACTGGAACTACTGACTACTGGGGCCAGGGAACCCTGG TCACTGTCTCTTCA

SEQ ID NO. 490 as shown below encodes a V _H domain of family 15 comprising or consisting of SEQ ID NO. 392.

SEQ ID NO. 490

GAGGTGCAGCTGGTGGAGTCTGGGGGAGGTGTGGTACGGCCTGGGGGGTCCCTGAGA CTCTCCTGTGCAGCCTCTGGATTCACCTTTGATGATTATGGCATGAGCTGGGTCCGCCA AGCTCCAGGGAAGGGGCTGGAGTGGGTCTCTGGTATTAATTGGAATGGTGATCGTACC GGTTATGCAGACTCTGTGAAGGGCCGATTCACCATCTCCAGAGACAACGCCAAGAACTC CCTGTATCTGCAAATGAACAGTCTGAGAGCCGAGGACACGGCCTTGTATTACTGTGGGA GAGAGAATGTTATAGTACCAGCTGCTACCTACTGGGGCCAGGGAACCCTGGTCACCGT CTCCTCA A nucleic acid according to the present invention may comprise DNA or RNA and may be wholly or partially synthetic or recombinantly produced. Reference to a nucleotide sequence as set out herein encompasses a DNA molecule with the specified sequence, and encompasses a RNA molecule with the specified sequence in which U is substituted for T, unless context requires otherwise.

The nucleic acid may be in the form of a construct, for example a plasmid, vector, transcription or expression cassette.

The invention also relates to an isolated recombinant host cell comprising one or more nucleic acid construct as described above. The host cell may be a bacterial, viral, mammalian or other suitable host cell. In one embodiment, the cell is an E. coli cell. In another embodiment, the cell is a yeast cell. In another embodiment, the cell is a Chinese Hamster Ovary (CHO) cell.

Methods for preparing or generating the polypeptides, nucleic acids, host cells, products and compositions described herein using in vitro expression libraries can comprise the steps of: a) providing a set, collection or library of nucleic acid sequences encoding amino acid sequences; and

b) screening said set, collection or library for amino acid sequences that can bind to / have affinity for PSMA and

c) isolating the amino acid sequence(s) that can bind to / have affinity for PSMA.

In the above methods, the set, collection or library of amino acid sequences may be displayed on a phage, phagemid, ribosome or suitable micro-organism (such as yeast), such as to facilitate screening. Suitable methods, techniques and host organisms for displaying and screening (a set, collection or library of) amino acid sequences will be clear to the person skilled in the art (see for example Phage Display of Peptides and Proteins: A Laboratory Manual, Academic Press; 1 st edition (October 28, 1996) Brian K. Kay, Jill Winter, John McCafferty). A binding molecule described herein, including a V _H domain, can be expressed in a transgenic rodent. The transgenic rodent, for example a mouse, may have a reduced capacity to express endogenous antibody genes. Thus, in one embodiment, the rodent has a reduced capacity to express endogenous light and/or heavy chain antibody genes. The rodent may therefore comprise modifications to disrupt expression of endogenous light and/or heavy chain antibody genes so that no functional light and/or heavy chains are produced.

Human heavy chain only antibodies capable of binding human PSMA can be produced by a method comprising

a) immunising a transgenic rodent with an PSMA antigen wherein said rodent expresses a nucleic acid construct comprising unrearranged human heavy chain V genes and is not capable of making functional endogenous light or heavy chains,

b) isolating human heavy chain only antibodies.

V _H domains can be produced by a method comprising a) immunising a transgenic mouse with an PSMA antigen wherein said mouse expresses a nucleic acid construct comprising human heavy chain V genes and is not capable of making functional endogenous light or heavy chains,

b) generating a library of sequences comprising V _H domain sequences from said mouse and

c) isolating sequences comprising V _H domain sequences from said libraries.

Further steps may include identifying a single V _H domain antibody or heavy chain only antibody that binds to human PSMA, for example by using functional assays as shown in the examples.

In one embodiment, the rodent is a mouse. The mouse may comprise a non-functional endogenous lambda light chain locus. Thus, the mouse does not make a functional endogenous lambda light chain. In one embodiment, the lambda light chain locus is deleted in part or completely or rendered non-functional through insertion, inversion, a recombination event, gene editing or gene silencing. For example, at least the constant region genes C1 , C2 and C3 may be deleted or rendered non-functional through insertion or other modification as described above. In one embodiment, the locus is functionally silenced so that the mouse does not make a functional lambda light chain. Furthermore, the mouse may comprise a non-functional endogenous kappa light chain locus. Thus, the mouse does not make a functional endogenous kappa light chain. In one embodiment, the kappa light chain locus is deleted in part or completely or rendered nonfunctional through insertion, inversion, a recombination event, gene editing or gene silencing. In one embodiment, the locus is functionally silenced so that the mouse does not make a functional kappa light chain.

The mouse having functionally-silenced endogenous lambda and kappa L-chain loci may, for example, be made as disclosed in WO 2003/000737, which is hereby incorporated by reference in its entirety.

Furthermore, the mouse may comprise a non-functional endogenous heavy chain locus. Thus, the mouse does not make a functional endogenous heavy chain. In one embodiment, the heavy chain locus is deleted in part or completely or rendered non-functional through insertion, inversion, a recombination event, gene editing or gene silencing. In one embodiment, the locus is functionally silenced so that the mouse does not make a functional heavy chain. For example, as described in WO 2004/076618 (hereby incorporated by reference in its entirety), all 8 endogenous heavy chain constant region immunoglobulin genes (μ, δ, γ3, γ1 , y2a, y2b, ε and a) are absent in the mouse, or partially absent to the extent that they are nonfunctional, or genes δ, γ3, γ1 , y2a, y2b and ε are absent and the flanking genes μ and a are partially absent to the extent that they are rendered non-functional, or genes μ, δ, γ3, γ1 , y2a, y2b and ε are absent and a is partially absent to the extent that it is rendered non-functional, or δ, γ3, γ1 , y2a, y2b, ε and a are absent and μ is partially absent to the extent that it is rendered non-functional. By deletion in part is meant that the endogenous locus gene sequence has been deleted or disrupted, for example by an insertion, to the extent that no functional endogenous gene product is encoded by the locus, i.e., that no functional product is expressed from the locus. In another embodiment, the locus is functionally silenced.

In one embodiment, the mouse comprises a non-functional endogenous heavy chain locus, a non-functional endogenous lambda light chain locus and a non-functional endogenous kappa light chain locus. The mouse therefore does not produce any functional endogenous light or heavy chains. Thus, the mouse is a triple knockout (TKO) mouse.

The transgenic mouse may comprise a vector, for example a Yeast Artificial Chromosome (YAC) for expressing a heterologous heavy chain locus. YACs are vectors that can be employed for the cloning of very large DNA inserts in yeast. As well as comprising all three cis-acting structural elements essential for behaving like natural yeast chromosomes (an autonomously replicating sequence (ARS), a centromere (CEN) and two telomeres (TEL)), their capacity to accept large DNA inserts enables them to reach the minimum size (150 kb) required for chromosome-like stability and for fidelity of transmission in yeast cells. The construction and use of YACs is well known in the art (e.g., Bruschi, C.V. and Gjuracic, K. Yeast Artificial Chromosomes, Encyclopedia of Life Sciences, 2002 Macmillan Publishers Ltd, Nature Publishing Group / www.els.net).

For example, the YAC may comprise a plethora of human V _H , D and J genes in combination with mouse immunoglobulin constant region genes lacking C _H 1 domains, mouse enhancer and regulatory regions.

Alternative methods known in the art may be used for deletion or inactivation of endogenous mouse or rat immunoglobulin genes and introduction of human V _H , D and J genes in combination with mouse immunoglobulin constant region genes lacking C _H 1 domains, mouse enhancer and regulatory regions. Transgenic mice can be created according to standard techniques as illustrated in the examples. The two most characterised routes for creating transgenic mice are via pronuclear microinjection of genetic material into freshly fertilised oocytes or via the introduction of stably transfected embryonic stem cells into morula or blastocyst stage embryos. Regardless of how the genetic material is introduced, the manipulated embryos are transferred to pseudo-pregnant female recipients where pregnancy continues and candidate transgenic pups are born.

The main differences between these broad methods are that ES clones can be screened extensively before their use to create a transgenic animal. In contrast, pronuclear microinjection relies on the genetic material integrating to the host genome after its introduction and, generally speaking, the successful incorporation of the transgene cannot be confirmed until after pups are born. There are many methods known in the art to both assist with and determine whether successful integration of transgenes occurs. Transgenic animals can be generated by multiple means including random integration of the construct into the genome, site-specific integration, or homologous recombination. There are various tools and techniques that can be used to both drive and select for transgene integration and subsequent modification including the use of drug resistance markers (positive selection), recombinases, recombination-mediated cassette exchange, negative selection techniques, and nucleases to improve the efficiency of recombination. Most of these methods are commonly used in the modification of ES cells. However, some of the techniques may have utility for enhancing transgenesis mediated via pronuclear injection.

Further refinements can be used to give more efficient generation of the transgenic line within the desired background. As described above, in preferred embodiments, the endogenous mouse immunoglobulin expression is silenced to permit sole use of the introduced transgene for the expression of the heavy-chain only repertoire that can be exploited for drug discovery. Genetically-manipulated mice, for example TKO mice that are silenced for all endogenous immunoglobulin loci (mouse heavy chain, mouse kappa chain and mouse lambda chain) can be used as described above. The transfer of any introduced transgene to this TKO background can be achieved via breeding, (either conventional or with the inclusion of an IVF step to give efficient scaling of the process). However, it is also possible to include the TKO background during the transgenesis procedure. For example, for microinjection, the oocytes may be derived from TKO donors. Similarly, ES cells from TKO embryos can be derived for use in transgenesis. Triple knock-out mice into which transgenes have been introduced are referred to herein as TKO/Tg. In one embodiment, the mouse is as described in WO2016/062990.

In another aspect of the present invention, there is provided a pharmaceutical composition comprising a PSMA binding molecule according to the present invention and optionally a pharmaceutically accepTable carrier. The binding molecule of the present invention or compositions can be administered by any convenient route. The compounds may be administered by any route, including oral and parenteral administration. Parenteral administration includes, for example, intravenous, intramuscular, intraarterial, intraperitoneal, intranasal, rectal, intravesical, intradermal, topical or subcutaneous administration. Compositions can take the form of one or more dosage units.

The composition of the invention can be in the form of a liquid, e.g., a solution, emulsion or suspension. The liquid can be useful for delivery by injection, infusion (e.g., IV infusion) or sub-cutaneously. The liquid compositions of the invention, whether they are solutions, suspensions or other like form, can also include one or more of the following: sterile diluents such as water, saline solution, preferably physiological saline, Ringer's solution, isotonic sodium chloride, fixed oils such as synthetic mono or diglycerides, polyethylene glycols, glycerin, or other solvents; antibacterial agents such as benzyl alcohol or methyl paraben; and agents for the adjustment of tonicity such as sodium chloride or dextrose. A composition can be enclosed in an ampoule, a disposable syringe or a multiple-dose vial made of glass, plastic or other material.

In specific embodiments, it can be desirable to administer one or more binding molecule of the present invention or compositions locally to the area in need of treatment, or by intravenous injection or infusion. The amount of the binding molecule of the present invention that is effective/active in the treatment of a particular disorder or condition will depend on the nature of the disorder or condition, and can be determined by standard clinical techniques. In addition, in vitro or in vivo assays can optionally be employed to help identify optimal dosage ranges. The precise dose to be employed in the compositions will also depend on the route of administration, and the seriousness of the disease or disorder, and should be decided according to the judgment of the practitioner and each patient's circumstances.

The compositions of the invention comprise an effective amount of a binding molecule of the present invention such that a suitable dosage will be obtained. The correct dosage of the compounds will vary according to the particular formulation, the mode of application, and its particular site, host and the disease being treated. Other factors like age, body weight, sex, diet, time of administration, rate of excretion, condition of the host, drug combinations, reaction sensitivities and severity of the disease shall be taken into account. Administration can be carried out continuously or periodically within the maximum tolerated dose.

Typically, this amount is at least about 0.01 % of a binding molecule of the present invention by weight of the composition.

Preferred compositions of the present invention are prepared so that a parenteral dosage unit contains from about 0.01 % to about 2% by weight of the binding molecule of the present invention.

For intravenous administration, the composition can comprise from about typically about 0.1 mg/kg to about 250 mg/kg of the animal's body weight, preferably, between about 0.1 mg/kg and about 20 mg/kg of the animal's body weight, and more preferably about 1 mg/kg to about 10 mg/kg of the animal's body weight.

The present compositions can take the form of suitable carriers, such aerosols, sprays, suspensions, or any other form suitable for use. Other examples of suitable pharmaceutical carriers are described in "Remington's Pharmaceutical Sciences" by E. W. Martin.

The pharmaceutical compositions can be prepared using methodology well known in the pharmaceutical art. For example, a composition intended to be administered by injection can be prepared by combining a binding molecule of the present invention with water so as to form a solution. A surfactant can be added to facilitate the formation of a homogeneous solution or suspension.

The invention furthermore relates to a method for the prevention and/or treatment of cancer, in particular prostate cancer, comprising administering a binding molecule of the invention to a patient, said method comprising administering, to a subject in need thereof, a pharmaceutically active amount of a binding molecule and/or of a pharmaceutical composition of the invention. In particular, the invention relates to a method for the prevention and/or treatment of cancer, in particular prostate cancer, said method comprising administering, to a subject in need thereof, a pharmaceutically active amount of a binding molecule or a pharmaceutical composition of the invention. The invention also relates to a binding molecule of the invention for use in the treatment of disease. The invention also relates to a binding molecule of the invention for use in the treatment of cancer, in particular prostate cancer or a prostatic disorder. "Prostate cancer" refers to all stages and all forms of cancer arising from the tissue of the prostate gland. The invention also relates to the treatment of a disease characterized by aberrant expression of PSMA.

In another aspect, the invention relates to the use of a binding molecule of the invention in the treatment of disease. In another aspect, the invention relates to the use of a binding molecule of the invention in the manufacture of a medicament for the treatment of cancer, in particular prostate cancer or a prostatic disorder.

The binding molecules of the invention are also useful for the treatment, prevention, or amelioration of cancer, in particular prostate cancer or a prostatic disorder. A prostatic disorder refers to any disease that afflicts the prostate gland in the male reproductive system.

The prostate gland is dependent on the hormonal secretions of the testes. Expression of

PSMA has been detected in other cancers, more specifically in the neovasculature associated with these cancers. A wide range of carcinomas, including conventional (clear cell) renal cell, transitional cell of the bladder, testicular-embryonal, neuroendocrine, colon, and breast, and the different types of malignancies were found consistently and strongly to express PSMA in their neovasculature.

The binding molecule of the invention may be administered as the sole active ingredient or in combination with one or more other therapeutic and/or cytotoxic moiety. In one embodiment, the binding molecule may be conjugated to a toxic moiety.

In therapies of prostatic disorders, e.g., prostate cancer, the anti-PSMA binding molecule can be used in combination with existing therapies. In one embodiment, the single domain antibody is used in combination with an existing therapy or therapeutic agent, for example an anti-cancer therapy. Thus, in another aspect, the invention also relates to a combination therapy comprising administration of a single domain antibody or pharmaceutical composition of the invention and an anti-cancer therapy. The anti-cancer therapy may include a therapeutic agent or radiation therapy and includes gene therapy, viral therapy, RNA therapy bone marrow transplantation, nanotherapy, targeted anti-cancer therapies or oncolytic drugs. Examples of other therapeutic agents include other checkpoint inhibitors, antineoplastic agents, immunogenic agents, attenuated cancerous cells, tumor antigens, antigen presenting cells such as dendritic cells pulsed with tumor-derived antigen or nucleic acids, immune stimulating cytokines (e.g., IL-2, IFNa2, GM-CSF), targeted small molecules and biological molecules (such as components of signal transduction pathways, e.g. modulators of tyrosine kinases and inhibitors of receptor tyrosine kinases, and agents that bind to tumor- specific antigens, including EGFR antagonists), an anti-inflammatory agent, a cytotoxic agent, a radiotoxic agent, or an immunosuppressive agent and cells transfected with a gene encoding an immune stimulating cytokine (e.g., GM-CSF), chemotherapy. In one embodiment, the single domain antibody is used in combination with surgery. The binding molecule of the invention may be administered at the same time or at a different time as the other therapy, e.g., simultaneously, separately or sequentially.

In another aspect, the invention provides a kit for detecting prostate cancer for diagnosis, treatment, prognosis or monitoring comprising a binding molecule of the invention. The kit may also comprise instructions for use. The kits may include a labeled binding molecule of the invention as described above and one or more compounds for detecting the label. The invention in another aspect provides a binding molecule of the invention packaged in lyophilized form, or packaged in an aqueous medium.

The invention also relates to detection methods using the binding molecule of the invention. Given their ability to bind to human PSMA, the human-PSMA-binding molecules, disclosed herein can be used to detect PSMA (e.g., in a biological sample, such as serum or plasma), using a conventional immunoassay, such as an enzyme linked immunosorbent assays (ELISA), an radioimmunoassay (RIA) or tissue immunohistochemistry. In particular, the invention also relates to in vitro or in vivo methods for diagnosing or monitoring progression of a cancer, in particular prostate cancer. In vitro methods comprise detecting the presence of a PSMA protein in a test sample and comparing this with control sample from a normal subject or with a standard value or standard value range for a normal subject. The sample may be selected from blood, plasma, serum, semen, urine or a tissue biopsy. The method may include: (a) contacting the sample (and optionally, a reference, e.g., a positive and/ or negative control sample) with a PSMA binding molecule of the invention and (b) detecting either the binding molecule bound to PSMA or unbound binding molecule in the sample, to thereby detect PSMA in the biological sample. The binding molecule can be directly or indirectly labeled with a detectable substance to facilitate detection of the bound or unbound antibody. Suitable detectable substances include various enzymes, prosthetic groups, fluorescent materials, luminescent materials and radioactive materials.

The invention also relates to an assay for assessing the internalization of PSMA binding molecule of the invention by labelling said binding molecule. Such an assay is described in the examples. In vivo methods may comprise detecting the presence of PSMA in vivo, for example by imaging in a subject. In this method, a PSMA binding molecule of the invention is labeled to detect binding. As an alternative to labeling the binding molecule of the invention, human PSMA can be assayed in biological fluids by a competition immunoassay utilizing PSMA standards labeled with a detectable substance and an unlabeled human PSMA binding molecule. In this assay, the biological sample, the labeled PSMA standards and the human PSMA binding molecule are combined and the amount of labeled PSMA standard bound to the unlabeled binding molecule is determined. The amount of human PSMA in the biological sample is inversely proportional to the amount of labeled PSMA standard bound to the PSMA binding molecule. Similarly, human PSMA can also be assayed in biological fluids by a competition immunoassay utilizing PSMA standards labeled with a detectable substance and an unlabeled human PSMA binding molecule.

Binding molecules disclosed herein can be used to inhibit PSMA activity, e.g., in a cell culture containing PSMA, in human subjects or in other mammalian subjects having PSMA with which a binding molecule disclosed herein cross-reacts. In one embodiment, a method for inhibiting or increasing PSMA activity is provided comprising contacting PSMA with a binding molecule disclosed herein such that PSMA activity is inhibited or increased. For example, in a cell culture containing, or suspected of containing PSMA, a binding molecule disclosed herein can be added to the culture medium to inhibit PSMA activity in the culture.

Therefore, in one embodiment, the invention also relates to a method of ablating or killing a cell that expresses PSMA, e.g., a cancerous or non-cancerous prostatic cell. Methods of the invention include contacting the cell, with PSMA binding molecule of the invention, in an amount sufficient to ablate or kill, the cell. The methods can be used on cells in culture, e.g., in vitro or ex vivo. Unless otherwise defined herein, scientific and technical terms used in connection with the present disclosure shall have the meanings that are commonly understood by those of ordinary skill in the art. While the foregoing disclosure provides a general description of the subject matter encompassed within the scope of the present invention, including methods, as well as the best mode thereof, of making and using this invention, the following examples are provided to further enable those skilled in the art to practice this invention and to provide a complete written description thereof. However, those skilled in the art will appreciate that the specifics of these examples should not be read as limiting on the invention, the scope of which should be apprehended from the claims and equivalents thereof appended to this disclosure. Various further aspects and embodiments of the present invention will be apparent to those skilled in the art in view of the present disclosure. All documents mentioned in this specification are incorporated herein by reference in their entirety, including references to gene accession numbers.

"and/or" where used herein is to be taken as specific disclosure of each of the two specified features or components with or without the other. For example "A and/or B" is to be taken as specific disclosure of each of (i) A, (ii) B and (iii) A and B, just as if each is set out individually herein. Unless context dictates otherwise, the descriptions and definitions of the features set out above are not limited to any particular aspect or embodiment of the invention and apply equally to all aspects and embodiments which are described. The invention is further described in the non-limiting examples.

EXAMPLES

EXAMPLE 1. Construction of Tg/TKO mice

Mice carrying a heavy-chain antibody transgenic locus in germline configuration within a background that is silenced for endogenous heavy and light chain antibody expression (triple knock-out, or TKO) were created as previously described (WO2004/076618 and WO2003/000737, Ren et a/., Genomics, 84, 686, 2004; Zou et al., J. Immunol., 170, 1354, 2003). Briefly, transgenic mice were derived following pronuclear microinjection of freshly fertilised oocytes with a yeast artificial chromosome (YAC) comprising a plethora of human V _H , D and J genes in combination with mouse immunoglobulin constant region genes lacking CH1 domains, mouse enhancer and regulatory regions. Yeast artificial chromosomes (YACs) are vectors that can be employed for the cloning of very large DNA inserts in yeast. As well as comprising all three cis-acting structural elements essential for behaving like natural yeast chromosomes (an autonomously replicating sequence (ARS), a centromere (CEN) and two telomeres (TEL)), their capacity to accept large DNA inserts enables them to reach the minimum size (150 kb) required for chromosome-like stability and for fidelity of transmission in yeast cells. The construction and use of YACs is well known in the art (e.g., Bruschi, C.V. and Gjuracic, K. Yeast Artificial Chromosomes, Encyclopedia of Life Sciences, 2002, Macmillan Publishers Ltd., Nature Publishing Group / www.els.net). The transgenic founder mice were back crossed with animals that lacked endogenous immunoglobulin expression to create the Tg/TKO lines used in the immunisation studies described. EXAMPLE 2. Antigen for immunisation

The immunisations used recombinant purified protein or Human Cell Line LNCap. Recombinant human PMSA was purchased from R&D, (cat. no. 4234-ZN), while the LNCap cells were from Sigma Aldrich (cat. no. 891 1021 1-1VL). EXAMPLE 3. Immunisation Protocol

Briefly, Tg/TKO mice aged 8 - 12 weeks of age each received a total of 50 μg of recombinant purified human PSMA protein, emulsified in Complete Freund's Adjuvant and delivered subcutaneously, or 10 million LNCap cells in PBS delivered intraperitoneal^, followed by boosts of 1 - 10μg of the recombinant protein, emulsified in Incomplete Freund's Adjuvant, also administered subcutaneously, given at various intervals following the initial priming. A final dose of the recombinant purified human PSMA protein antigen was administered intraperitoneally, in phosphate buffered saline, in the absence of adjuvant.

Alternative immunisation routes and procedures can also be employed. For example, different adjuvants or immune potentiating procedures may be used instead of Freund's adjuvant. DNA immunisations are often delivered intramuscularly or via a Genegun. Transfected cells or membrane preparations from such cells are often, although not exclusively, administered intraperitoneally. EXAMPLE 4. Serum ELISA

During and following immunisation, serum was collected from mice and checked for the presence of heavy-chain antibody responses to the immunogen by ELISA. Nunc Maxisorp plates (Nunc cat. no. 443404) were coated overnight at 4°C with 50μΙ/ννβΙΙ of a ^g recombinant antigen/ml of PBS solution. Following decanting of the antigen solution, plates were washed using PBS (prepared from PBS Tablets, Oxoid cat. no. BR0014G) supplemented with 0.05% (v/v) Tween® 20 (Sigma P1379), followed by washes with PBS without added Tween 20. To block non-specific protein interactions, a solution of 3% (w/v) skimmed milk powder (Marvel®) in PBS was added to the wells and the plate was incubated for at least one hour at room temperature. Dilutions of serum in 3% Marvel™/PBS were prepared in polypropylene tubes or plates and incubated for at least one hour at room temperature prior to transfer to the blocked ELISA plate where a further incubation of at least one hour took place. Unbound protein was then washed away using repetitive washes with PBS/Tween 20 followed by PBS. A solution of biotin-conjugated, goat anti-mouse IgG, Fcgamma subclass 1 specific antibody (Jackson cat. no.115-065-205), prepared in PBS/3% Marvel was then added to each well and a further incubation at room temperature for at least one hour took place. Unbound detection antibody was removed by repeated washing using PBS/Tween 20 and PBS. Neutravidin-HRP solution (Pierce cat. no. 31030) in 3% Marvel/PBS was then added to the ELISA plates and allowed to bind for at least 30 minutes. Following further washing, the ELISA was developed using TMB substrate (Sigma cat. no. T0440) and the reaction was stopped after 10 minutes by the addition of 0.5M H ₂ S0 ₄ solution (Sigma cat. no. 320501). Absorbances were determined by reading at an optical density of 450nm. Alternative assays, such as ELISPOT assays, may also be used to check for immunisation induced heavy-chain antibody responses.

EXAMPLE 5. Generation of Libraries from Immunised Mice

a) processing tissues, RNA extraction and cDNA manufacture

Spleen, inguinal and brachial lymph nodes were collected into RNAIate® from each immunised animal. For each animal, 1/2 of the spleen and 4 lymph nodes were processed separately. Initially, the tissues were homogenised; following transfer of tissues to Lysing matrix D bead tubes (MP Bio. Cat. no. 1 16983001), 600μΙ of RLT buffer containing β- mercaptoethanol (from Qiagen RNeas® kit cat. no. 74104) was added before homogenisation in a MP Bio Fastprep96 homogeniser (cat# 116010500) at 1600rpm for 60 seconds. The tubes containing the homogenised tissues were transferred to ice and debris was pelleted by centrifugation at 1200rpm for 5 minutes. A 400μΙ sample of the supernatant was removed and used for RT-PCR. Initially, RNA was extracted using Qiagen RNeasy® kit (cat. no. 74104) following the manufacturer's protocol. Each RNA sample was then used to make cDNA using Superscript III RT-PCR high-fidelity kit (Invitrogen cat. no. 12574-035). For each spleen and lymph nodes RNA sample, 5 RT-PCR reactions were performed, each with Vn_J/F (long) primer in combination with a primer for V _H 1 , V _H 2, V _H 3, V _H 4 or V _H 6 family. Details of the primers are below.

Table 16. Primers for V10

V1a/pelB( GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTBCA long) GCTGGTGCAGTCTGGGGCTGAGG SEQ ID No. 491

V2/pelB(l GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGATCAC ong) CTTGAAGGAGTCTGG SEQ ID No. 492

V3/pelB(l GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCSAGGTGCA ong) GCTGGTGGAGTCTGGGGGAGG SEQ ID No. 493

V4- GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTGC

4/pelB(lon AGCTGCAGGAGTCGGG SEQ ID No. 494

g)

V6/pelB(l GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTACA ong) GCTGCAGCAGTCAGG SEQ ID No. 495

VH_J/F(lo CCGTGGTGATGGTGGTGATGGCTACCGCCACCCTCGAGTGARGAGACRG ng) TGACC SEQ ID No. 496

Residues in bold have homology with pUCG3 Table 17 Primers for V23

VH1-2 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTGC (long) AGCTGGTGCAGTCTGGGGCTGAGG SEQ ID No. 497

VH1-3 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTCC (long) AGCTCGTGCAGTCTGGGGCTGAGG SEQ ID No. 498

VH1-18 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTTC (long) AGCTGGTGCAGTCTGGAGCTGAGG SEQ ID No. 499

VH1-24 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTCC (long) AGCTGGTACAGTCTGGGGCTGAGG SEQ ID No. 500

VH2 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGRTCA (long) CCTTGAAGGAGTCTGG SEQ ID No. 501

VH3-7 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCGAGGTGC (long) AGCTGGTGGAGTCTGGGGGAGG SEQ ID No. 502

VH3-9 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCGAAGTGC (long) AGCTGGTGGAGTCTGGGGGAGG SEQ ID No. 503

VH3-1 1 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTGC (long) AGCTGGTGGAGTCTGGGGGAGG SEQ ID No. 504

VH3-23 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCGAGGTGC (long) AGCTGTTGGAGTCTGGGGGAGG SEQ ID No. 505

VH3-23 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCGAGGTGC (long) AGCTGTTGGAGTCTGGGGGAGG SEQ ID No. 506

VH4-4 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTGC (long) AGCTGCAGGAGTCGGG SEQ ID No. 507

VH4-34 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTGC (long) AGCTACAGCAGTGGGGC SEQ ID No. 508

VH6-1 GCCGCTGGATTGTTATTACTCGCGGCCCAGCCGGCCATGGCCCAGGTAC (long) AGCTGCAGCAGTCAGG SEQ ID No. 509 VH_J/F(lo CCGTGGTGATGGTGGTGATGGCTACCGCCACCCTCGAGTGARGAGACRG ng) TGACC SEQ ID No. 510

Residues in bold have homology with pUCG3

R A, G

Y C, T

M A, C

K G, T

S C, G

W A, T

B C, G, T

V A, C, G

D A, G, T

N A, C, G, T

Mastermixes were prepared for the RT-PCR reactions, based on the following tube reaction components:

12.5μΙ 2x reaction mix

0.5μΙ forward primer (10μΜ)

0.5μΙ reverse primer (10μΜ)

0.5μΙ enzyme mix

500ng - ^g RNA

Up to 25μΙ with water

The RT-PCR reactions were carried out in a thermal cycler using the following conditions: 55°C 20min

94°C 2min

35 cycles of 94°C 15sec

58°C 30sec

68°C 30sec

68°C 5min

Hold at 4°C

Products in the range of 370bp were confirmed by gel electrophoresis.

For each mouse, the V _H products amplified for a given family from the 1/2 spleen and each of the 4 lymph nodes were then pooled for purification using Thermo/Fermentas GeneJet PCR purification kit (cat. no. K0702) which was used according to the manufacturer's instructions, with the products eluted in 50μΙ of water. a) Cloning into phagemid vector

The phagemid vector, pUCG3, was employed in these studies. A PCR-based method was used to construct the V _H phagemid libraries from the amplified V _H sequences. The following procedure was used:

A linearised version of pUCG3 was created using PCR; with the following primers:

pUCG3-pHENAPmut4 GGCCATGGCCGGCTGGGCCGCGAG SEQ ID No. 511 pUCG3-pHENAPmut5mycHis

TCATCGAGGGTGGCGAGCGAACAAAAACTCATCTCAGAAGAATCTGAATCATCACACAT CACACGGGAGCTAGACTGTTGAAAGTTGTTTAGCAAAACC SEQ ID No. 512

Phusion High fidelity PCR master mix with GC buffer (cat. no. F532L, NEB) was used for the PCR reactions which comprised the following reagents:

Phusion GC 2x mix 25μΙ

pUCG3 5-1 Ong

Primers (10 μΜ) 1.25μΙ of each

DMSO 1.5μΙ

Nuclease-free H ₂ 0 to final volume of 50μΙ

The cycling conditions used were:

98°C 30 seconds

10 cycles of

98°C 10 seconds

58°C 20 seconds

68°C 2 minutes, 30 seconds

20 cycles of

98°C 10 seconds

58°C 20 seconds

68°C 3 minutes

68°C 5 minutes

4°C hold

The PCR product (3152bp) was gel purified using Fermentas GeneJet Gel purification kit (cat. no. K0691), according to the manufacturer's instructions, with final elution in 40μΙ of elution buffer.

The purified V _H RT-PCR products were employed as megaprimers with the linearised pUCG3 to give phagemid products for transformation and library creation, based on the following reactions;

Phusion GC 2x mix 25μΙ Linearised pUCG3 800ng

V _H PCR product 200ng

DMSO 1.5μΙ

Nuclease-free H ₂ 0 to 50μΙ final volume

PCR was performed as follows:

98°C 30sec

10 cycles

72°C 5min

Hold at 10°C

The products of PCR were analysed on a 1 % (w/v) agarose gel.

The various family V _H /phagemid products were purified using Fermentas PCR purification kit (cat. no. K0702) according to the manufacturer's instructions with the final elution being in 25μΙ H ₂ 0; this eluate was used for transformations of TG1 E. coli (Lucigen, cat. no. 60502-2) by electroporation using BioRad 2 x 0.2cm cuvettes (BioRad cat. no. 165-2086) in a Bio-Rad GenePulser Xcell and pre-warmed recovery medium (Lucigen, proprietary mix). 22μΙ of the purified products were added to 160μΙ of cells for the electroporation, with 2 electroporations being performed for each V _H /phagemid product at 2000v. Electroporated cells were pooled and recovered in 50ml Falcon tubes incubated for 1 hour at 37°C with shaking at 150rpm. A 10-fold dilution series of an aliquot of the transformations was performed and plated in petri dishes containing 2xTY agar supplemented with 2% (w/v) glucose and 100μg/ml ampicillin. Resulting colonies on these dishes were used to estimate the library size. The remainder of the transformation was plated on large format Bioassay dishes containing 2xTY agar supplemented with 2% (w/v) glucose and 100μg/ml ampicillin. All agar plates were incubated overnight at 30°C. 10 ml of 2xTY broth was added to the large format bioassay dishes and colonies were scraped and OD ₆ oo measured (OD of 1.0 = 5 x 10 ⁸ cells/ml). Aliquots were stored at -80°C in cryovials after addition of 50% (v/v) glycerol solution or used directly in a phage selection process.

EXAMPLE 6. Selection strategies for isolation of PSMA binders

Preparation of library phage stocks and phage display selections were performed according to published methods (Antibody Engineering, edited by Benny Lo, chapter 8, p161-176, 2004). In most cases, phage display combined with a panning approach was used to isolate binding V _H domains. However, a variety of different selection methods are well described in the art, including soluble selection and selections performed under stress (e.g. heat). Selections to promote internalising anti-PSMA V _H were also conducted with monovalent and multivalent phage (patent US2009170792 (A1)— 2009-07-02). Briefly, blocked phage in ice- cold cell media were added to 4ml ice-cold cell media containing 2.5 x 10 ⁶ LnCAP cells. Phage and cells were incubated on ice for 2 hours, mixing occasionally to prevent cell clumping. Unbound or weakly bound phage were removed by washing five times in ice-cold PBS. The phage were then allowed to internalise by incubating the cells in media at 37°C before removing phage bound to the outside of the cells with a 5 minutes wash step in a low pH cell-stripping buffer at 4°C. The cells were then lysed to harvest internalised phage using trimethylamine. Both the stripped and internalised fractions were neutralised with Tris buffer before being used to infect E.coli. The phage outputs were analysed as described for panning selections on recombinant proteins.

EXAMPLE 7. Assays for target binding

V _H from the different selections were screened in one or more of the following assays to identify specific V _H capable of binding PMSA. a) Binding ELISA

Following selections of the libraries, specific V _H antibodies were identified by phage ELISA following published methods (Antibody Engineering, edited by Benny Lo, chapter 8, p161- 176, 2004). Phage ELISAs were performed against target protein and an unrelated antigen as control. In some cases, purified or crude extracts of V _H domains were assayed by ELISA instead of using a phage ELISA. In these cases, bacterial periplasmic extracts or purified V _H were used. Small-scale bacterial periplasmic extracts were prepared from 1 ml cultures, grown in deep well plates. Starter cultures were used to inoculate 96-well deep well plates (Fisher, cat. no. MPA-600-030X) containing 2XTY broth (Melford cat. no. M2130), supplemented with 0.1 % (w/v) glucose + 100μg/ml ampicillin at 37°C with 250rpm shaking. When OD ₆ oo had reached 0.6-1 , V _H production was induced by adding 100μΙ of 2XTY, supplemented with IPTG (final concentration 1 mM) and ampicillin and the cultures were grown overnight at 30°C with shaking at 250rpm. E. coli were pelleted by centrifugation at 3200rpm for 10 mins and supernatants discarded. Cell pellets were resuspended in 30-100μΙ of ice cold extraction buffer (20% (w/v) sucrose, 1 mM EDTA & 50mM Tris-HCI pH 8.0) by gently pipetting. Cells were incubated on ice for 30 minutes and then centrifuged at 4500rpm for 15 mins at 4°C. Supernatants were transferred to polypropylene plates and used, following incubation in Marvel/PBS blocking solution, in the ELISA. The purified V _H were obtained by using the V _H C-terminal 6xHIS tag for Ni-NTA affinity chromatographic purification of the periplasmic extracts. A starter culture of each V _H was grown overnight in 5ml 2XTY broth (Melford cat. no. M2103) supplemented with 2% (w/v) glucose + 10C^g/ml ampicillin at 30°C with 250rpm shaking. 50μΙ of this overnight culture was then used to inoculate 50ml 2XTY supplemented with 2% (w/v) glucose + 100μg/ml ampicillin and incubated at 37°C with 250rpm shaking for approximately 6-8 hours (until OD ₆ oo = 0.6-1.0). Cultures were then centrifuged at 3200rpm for 10 mins and the cell pellets resuspended in 50ml fresh 2XTY broth containing 100μg/ml ampicillin + 1 mM IPTG. Shake flasks were then incubated overnight at 30°C and 250rpm. Cultures were again centrifuged at 3200rpm for 10 mins and supernatants discarded. Cell pellets were resuspended in 1 ml ice cold extraction buffer (20% (w/v) sucrose, 1 mM EDTA & 50mM Tris-HCI pH 8.0) by gently pipetting and then a further 1.5ml of 1 :5 diluted ice cold extraction buffer added. Cells were incubated on ice for 30 minutes and then centrifuged at 4500rpm for 15 mins at 4°C. Supernatants were transferred to 50ml Falcon tubes containing imidazole (Sigma cat. no. I2399 - final concentration 10mM) and 0.5ml of nickel agarose beads (Qiagen, Ni-NTA 50% soln, cat. no. 30210) pre- equilibrated with PBS buffer. V _H binding to the nickel agarose beads was allowed to proceed for 2 hours at 4°C with gentle shaking. The nickel agarose beads were then transferred to a polyprep column (BioRad cat. no. 731-1550) and the supernatant discarded by gravity flow. The columns were then washed 3 times with 5ml of PBS+0.05% Tween® followed by 3 washes with 5ml of PBS containing imidazole at a concentration of 20mM. V _H were then eluted from the columns by the addition of 250μΙ of PBS containing imidazole at a concentration of 250mM. Imidazole was then removed from the purified V _H preparations by buffer exchange with NAP-5 columns (GE Healthcare, 17- 0853-01) and then eluting with 1 ml of PBS. Yields of purified V _H were estimated spectrophotometrically and purity was assessed using SDS PAGE.

Alternatively anti-PSMA V _H were purified from the supernatants of W31 10 E coli with pj Express vector. For this procedure up to 400ml cultures were grown at 37°C with 250rpm shaking in TB media before being induced overnight with 1 mM IPTG overnight. The resulting supernatants were harvested and V _H purified on AKTA Pure using a Ni-Sepharose excel column (HiScale 16, GE Healthcare). Yields of purified V _H were estimated spectrophotometrically and purity was assessed using SDS PAGE.

The binding ELISA for crude or purified V _H was similar to the serum ELISA and phage ELISA, previously described, mostly differing in the final detection steps. Briefly, antigen was immobilised on Maxisorb plates (Nunc 443404) by adding 50μΙ volumes at 0.1 - 2μg/ml in PBS and incubating at 4°C overnight. Following coating, the antigen solution was aspirated and the plates were washed using PBS (prepared from PBS Tablets, Oxoid cat. no. BR0014G) supplemented with 0.05% Tween® 20 (Sigma cat. no. P1379), followed by washes with PBS without added Tween® 20. To block non-specific protein interactions, a solution of 3% skimmed milk powder (Marvel®) in PBS was added to the wells and the plate was incubated for at least one hour at room temperature. Dilutions of periplasmic extract or purified V _H in 3% Marvel®/PBS were prepared in polypropylene tubes or plates and incubated for at least one hour at room temperature prior to transfer to the blocked ELISA plate where a further incubation of at least one hour took place. Unbound protein was then washed away using repetitive washes with PBS/Tween followed by PBS. A solution of HRP- conjugated anti-Myc Ab (Santa Cruz cat. no. SC-40), prepared at 1 :50 dilution in PBS/3% Marvel was then added to each well and a further incubation at room temperature for at least one hour took place. Unbound detection antibody was removed by repeated washing using PBS/Tween® and PBS. The ELISA was then developed using TMB substrate (Sigma cat. no. T0440) and the reaction was stopped after 10 minutes by the addition of 0.5M H ₂ S0 ₄ solution (Sigma cat. no. 320501). Absorbances were determined by reading at 450nm. b) FMAT Direct cell Binding Assay

Periplasmic extracts from E.coli were screened for production of PSMA-binding-His-tagged V _H using Fluorescence Microvolume Assay Technology (FMAT), a fluorescence-based platform that detects fluorescence localized to beads or cells settled at the bottom of microwells (Dietz ei al., Cytometry 23: 177- 186 (1996), Miraglia et a/., J. Biomol. Screening 4: 193-204 (1999). CHO TREX human and cynomolgus cell lines were generated in-house using full-length human and cynomolgus PSMA using standard procedures. LnCAP cells were purchased from Sigma Aldrich.

Peripreps were tested by single point screening for the presence of V _H that bound specifically to CHO human PSMA, CHO cyno PSMA and LnCAP cells with no binding to CHO parental cells in an FMAT Direct Binding Assay. Cells were resuspended at 0.1 x 10 ⁶ cells/ml in FMAT assay buffer (pH 7.4) containing PBS, 0.1 % Bovine Serum Albumin, 0.01 % Sodium Azide and 120nM DRAQ5 (Thermo Scientific cat. no. 62251 ) added to the cell suspension. Peripreps (10μΙ) were transferred into 384 well black clear-bottomed assay plates (Costar cat. no. 3655) and 10μΙ of 6nM mouse Anti-His (Millipore cat. no. 05-949)/12nM Goat Anti- Mouse Alexa Fluor-488 (Jackson Immunolabs cat. no. 115-545-071 ) mix added. The DRAQ5 stained cells (20μΙ per well) were then added and the assay plates incubated for 2 hours at room temperature. Plates were read in the FL2 (502nm-537nm) and FL5 (677-800nm) channels on the TTP Mirrorball plate reader following excitation at 488nm and 640nm. Data was gated on FL5 perimeter and peak intensity and the FL2 median mean fluorescence intensity of the gated data used for determination of V _H binding.

For titrations, V _H purified via the terminal His tag were serially diluted in FMAT assay buffer then binding was measured as described above (Figure 16). Improved monovalent variants show similar properties to the parent V _H (Figure 16b and 16c). Biparatopic binding molecules were also tested (16d and e) and showed good binding to human PSMA CHO cells. The linker length used was (G ₄ S) ₆ ..The Table below shows the different CDR3 sequences of the V _H families identified together with their binding characteristics.

Table 18 (prepared from phagemid and peripreps)

Cyno Human CHO

VH

CDR3 rhPSMA PSMA PSMA parent LnCAP family

CHO CHO

DPAWGLRLGESSSYDFDI VH3- SEQ I D No.513 30 Y Y Y N Y

DRIVGGRVPDAFDI VH3- SEQ I D No.514 30 Y Y Y N Y

VH3-

ERIFGVLTPDDFDI SEQ I D No.515 30 Y Y Y N Y

GLWPSDV VH3- 516 30 Y Y Y N Y

VH3-

GLWPPMDV SEQ I D No.517 30 Y Y Y N Y

GDYDFWSGYPDYDMDV VH3- SEQ I D No.518 30 Y Y Y N Y

GGNALYSSGWPDD VH3- SEQ I D No. 519 30 Y Y Y N Y

DGVH VH3- SEQ I D No.520 23 Y Y (weak) Y N Y

ENVIVPAATY VH3- SEQ I D No.521 20 Y Y Y N Y

DSLIVGERGY VH3- Y SEQ I D No. 522 07 Y Y (weak) Y (weak) N (Weak)

DRGGAVALYHNGMDM VH3- SEQ I D No. 523 07 Y N Y N Y

DYGDSRSLFDY VH4- SEQ I D No. 524 34 N Y Y N Y

GPIPATAIPDAFDI VH4- SEQ I D No. 525 34 N Y Y N Y

DGDDYGDY VH4- Y (Very

SEQ I D No. 526 41 Y Weak) Y N Y

GNGPGITGTTDY VH1- SEQ I D No. 527 08 Y/N Y Y N Y Table 19 EC50 values for anti-PSMA V _H binding to PSMA expressing cell lines, (prepared from purified V _H )

Table 20 EC ₅₀ values for anti-PSMA V _H binding to human PSMA-CHO. The linker length used was (G ₄ S) ₆ .

No Construct EC50

1 1.1-2.1 3.616E-10

2 1.1-2.17 2.639E-10

3 1.1-2.15 1.948E-10

4 1.1-2.22 1.784E-10

5 1.16-2.1 3.057E-10

6 1.16-2.17 3.327E-10

7 1.16-2.15 1.967E-10

8 1.16-2.22 2.250E-10

9 1.1 1-2.1 2.871 E-10

10 1.1 1-2.17 2.805E-10

1 1 1.1 1-2.15 2.100E-10

12 1.1 1-2.22 2.187E-10

13 1.18-2.1 2.938E-10

14 1.18-2.17 2.778E-10

15 1.18-2.15 1.921 E-10

16 1.18-2.22 1.958E-10

17 1.17-2.1 3.252E-10

18 1.17-2.15 2.986E-10

19 1.17-2.17 1.921 E-10

20 1.17-2.22 1.989E-10 Each individual V _H clone as identified above was sequenced from the phagemid and grouped based on V _H germline and CDR3 amino acid similarity into separate families. Representative clones were further characterised. Variants, including germlined variants, were generated by standard methods of parent clones e.eg 1.1 and 2.1. Figure 1 shows the sequences of clones 1.1 to 1.20 isolated as described herein above and grouped into a single family. Clones 1.8-1.20 are variants of 1.1. Figure 2 shows the sequences of clones 2.1 to 2.25 isolated as described herein above and grouped into a single family. Clones 2.2, 2.1 1-2.19, 2.22-2.25 are variants of 2.1. Figure 3 shows the sequences of clones 3.1 to 3.24 isolated as described herein above and grouped into a single family. Clones 3.20-3.25 are variants of 3.1.

EXAMPLE 8 - Characterisation of V _H

a) Specificity of anti-PMSA

The specificity of individual V _H for target antigen was confirmed by ELISA, following the methods described in Example 7(a). V _H were tested for binding to PMSA and shown not to cross react with irrelevant proteins. b) Measurement of Binding Kinetics and epitope binding using Octet

Binding kinetics of purified anti-PSMA V _H antibodies were measured on a ForteBio Octet RED 384 instrument. Recombinant PMSA was diluted to 20μg/ml in sodium acetate buffer, pH 5 (ForteBio, cat. no. 18-1069) and coupled to ARG2G biosensors (ForteBio cat. no. 18- 5092) using amine-coupling chemistry (NHS-EDC amine-coupling, ForteBio cat. nos. 18- 1067 and 18-1033), followed by quenching in ethanolamine (ForteBio cat. no. 18-1071). Binding kinetics of anti-PSMA V _H antibodies were then determined by preparing each V _H antibody in dilution series (typically 1 :2 dilution series starting with 15μg/ml, V _H at the highest concentration), and then measuring binding of the different V _H concentrations to the PSMA- coupled biosensors. V _H binding kinetics were then determined from the (blank subtracted) sensorgram trace using 1 :1 binding models and ForteBio Octet DataAnalysis software. Binding affinities from 1-150nM and in the subnanomolar range were detected and examples of the binding parameters are shown in Table 21 below.

Table 21

KD (nM) Kdis

(1/s)

2.1 1.64 4.56E-04

1.1 2.44 1.54E-03

3.1 3.78 4.52E-04 Further family members in particular variants of parent molecules were also tested as below using 1 :2 dilution series starting with 0.375μg/ml. Binding affinities in the nanomolar and picomolar range were detected as shown in Tables 22 and 23.

Table 22 Family 1

Single domain antibodies purified from periplasmic extracts using Ni-NTA chromatography (via the C-terminal His-tag) as in example 7a were also tested. Results are shown in the Table below. Binding affinities in the nanomolar range were detected.

Table 24

clone number KD (nM) Kdiss (1/s)

4.1 45 1.4 x 10-2

5.1 30 9.1 x 10-3

12.1 3.9 1.37E-03

10.1 95 1.85 x 10-3

11.1 26 0.00149

7.1 41 4.783 x 10-4

13.1 4.2 6 x 10-4

6.1 16 3.65 x 10-3

14.1 17 1.1 x 10-3 c) Measurement of Internalization of Cynomolgus PSMA-Binding V _H using Fluorescence Microvolume Assay Technology

Internalization of purified V _H was measured using the pH-sensitive fluorescent dye pHrodo® green. Anti-His antibody (Millipore cat. no. 05-949) was labelled with pHrodo® Green STP ester (Molecular Probes cat. no. P35369) according to the manufacturer's instructions. All samples and reagents were prepared in internalization buffer (pH 7.4) containing PBS and 0.1 % Bovine Serum Albumin. CHO cells expressing cynomolgus PSMA were resuspended at 0.1 x 10 ⁶ cells/ml and 120 nM DRAQ5 added to the cell suspension. V _H (1 ΟμΙ) were transferred into 384-well black clear-bottomed assay plates (Costar cat. no. 3655) and 10μΙ of 40nM pHrodo® green labelled Anti-His antibody added followed by 20 μΙ DRAQ5 stained cells. Plates were incubated at 37°C for 2hr then equilibrated to room temperature. Fluorescence emission in the FL2 (502nm-537nm) and FL5 (677-800nm) channels were measured on TTP Mirrorball plate reader following excitation at 488nm and 640nm. Data was gated on FL5 perimeter and peak intensity and the FL2 median mean fluorescence intensity of the gated data used for determination of V _H internalization (Figure 17).

Internalization of variants of single domain antibodies 1.1 and 1.2 was measured using the pH sensitive fluorescent dye pHrodo® green as described above except serially diluted V _H were pre-incubated with pHrodo® green labelled Anti His antibody for 30 minutes at room temperature prior to addition of DRAQ5 stained CHO human PSMA clone 1A10 cells (20μΙ). Plates were incubated for 2 hour at room temperature then fluorescent emission measured. Activity of the V _H in the assay is shown in Table 25 below.

Table 25 pH® RodoGreen Internalization Assay

Name human PSMA Average EC ₅₀ (M)

1.8 5.0E-10

1.10 6.4E-10

1.11 3.7E-10

1.12 5.7E-10

1.14 4.4E-10

1.16 4.8E-10

1.17 2.9E-10

1.18 3.1 E-10

2.1 8.0E-10

2.13 5.8E-10

2.17 8.0E-10

2.15 7.2E-10

2.12 5.3E-10

2.22 6.7E-10 d) Measurement of Internalization of PSMA Binding V _H using the His-ZAP Assay

Internalization of His tagged PSMA binding V _H was assessed using an anti-His antibody conjugated to saporin toxin (His-ZAP Advanced targeting Systems IT52). The His-ZAP reagent binds to the V _H and is internalized through the V _H interaction with PSMA on the cell surface. Saporin toxin is released from the complex in the endosome and inactivates ribosomes eventually resulting in cell death.

CHO cells expressing mouse or cynomolgus PSMA (400 cells per well in a 30 μΙ volume) were seeded into 384-well black clear-bottomed tissue culture-treated assay plates (Costar cat. no. 3712) in Hams F12 (Sigma cat. no. N6658) media containing 10% foetal bovine serum, 2mM L-glutamine, 10μg/ml blasticidin, 300μg/ml Zeocin, penicillin/streptomycin, ^g/ml tetracycline and incubated overnight in a C0 ₂ incubator at 37°C. Purified V _H were serially diluted in media then an equal volume of 40nM His-ZAP added. Following incubation for 30 minutes at 37°C the V _H /His-ZAP samples (1 ΟμΙ) were transferred to the cell assay plates and incubated for 48 hours in a C0 ₂ incubator at 37°C. His-ZAP control wells (cells with His-ZAP reagent) and background controls (media only) were set up on each plate for data normalization. Cell viability was determined following the 48 hour incubation using the Cell Titer-Glo Cell Viability assay (Promega cat. no. G7571) according to the manufacturer's instructions. Relative luminescent signal (RLU) was measured using the BMG PHERAstar plate reader. The data was normalized by subtraction of the RLU signal obtained in the absence of cells and expression as a percentage of the background-corrected signal of the His-ZAP control wells (Figure 18).

For LnCAP assays, cells (2000 per well in a 100 μΙ volume) were seeded into 96-well TC- treated plates (Costar 3340) in RPMI 1640 media containing 10% foetal bovine serum, 2 mM L-glutamine and penicillin/streptomycin. Purified V _H were serially diluted in media, then an equal volume of 60 nM His-ZAP was added. Following incubation for 30 minutes at 37 °C the V _H /His-ZAP samples (100 μΙ) were transferred to the cell assay plates and incubated for 96 hours in C0 ₂ incubator at 37 °C. Cell viability was measured using the Cell Titer-Glo Cell Viability assay and data analysed as described above. Examples are given in Figure 19.

The ability of variants of single domain antibodies 1.1 and 2.1 to internalize with a bound saporin conjugated anti His antibody, resulting in toxin mediated cell death, was determined. Assays were performed as described above except CHO human PSMA clone 1A10 cells were used for human PSMA assays and plates were incubated for 72 hours in a C02 incubator at 37°C prior to measurement of cell viability. Activity of the single domain antibodies tested in the assay is shown in Table 26 below. Table 26

Biparatopic molecules were tested and showed the following EC50 values.

Table 27

EXAMPLE 9 - Stability of V _H

V _H from the different CDR3 families were tested for developability characteristics. a) Heat Stability: HPLC Size Exclusion Chromatography

Purified VH were subjected to size exclusion chromatography. Briefly, purified V _H were stored in PBS buffer for 0-14 days at either 4°C or 40°C, and then analysed at various time points using a Waters H-Class Bio UPLC containing a PDA detector (detection at 280nm) with separation on a Waters ACQUITY BEH 125A SEC column. Samples were injected in 10μΙ volumes and were run in a mobile phase containing 200 mM NaCI, 100 mM sodium phosphate, pH 7.4 + 5% propan-1 -ol at a flow rate of 0.4ml/min. Data were collected for 6 minutes and the percentage of monomer remaining after storage as compared to that present at the start (T=0) was calculated. Parent molecules showed high stability. Variants were also tested.

It should be noted that these data were collected under non-optimised buffer conditions. Concentration of samples varied: Monovalent 1 .1 variants: 5.0 mg/ml

Monovalent 2.1 variants: 3.5 mg/ml

Results are shown in the Tables below.

Table 27

Table 28

Table 29 Name %Area TO Monomer 4°C % Area TO Monomer 40°C

0 4 7 14 0 1 4 7 14

1.1-6GS-2.1 100.00 109.56 68.16 68.02 100.00 105.79 94.77 64.98 64.58

1.1-6GS-2.17 100.00 116.15 75.23 75.20 100.00 111.31 101.98 68.73 63.67

1.1-6GS-2.15 100.00 111.01 72.93 73.21 100.00 106.51 95.09 70.50 58.28

1.1-6GS-2.22 100.00 116.88 80.88 80.66 100.00 110.00 105.22 74.44 75.37

1.16-6GS-2.1 100.00 135.96 110.01 110.26 100.00 101.92 116.20 106.53 106.74

1.16-6GS-2.17 100.00 125.26 106.57 106.10 100.00 117.55 110.34 100.59 96.83

1.16-6GS-2.15 100.00 136.57 117.42 118.25 100.00 121.10 117.79 107.33 106.12

1.16-6GS-2.22 100.00 122.20 105.46 104.15 100.00 100.32 104.92 97.31 93.30

1.11-6GS-2.1 100.00 76.33 98.05 97.37 100.00 96.51 95.53 N/A 98.38

1.11-6GS-2.17 100.00 45.23 98.17 97.40 100.00 96.51 94.72 N/A 90.52

1.11-6GS-2.15 100.00 101.17 98.87 98.68 100.00 97.23 94.78 N/A 87.98

1.11-6GS-2.22His 100.00 102.38 100.84 99.07 100.00 98.45 100.47 N/A 82.62

1.18-6GS-2.1 100.00 102.42 98.53 97.83 100.00 92.81 90.11 85.86 85.82

1.18-6GS-2.17 100.00 101.18 97.79 97.30 100.00 92.66 87.07 84.42 79.49

1.18-6GS-2.15 100.00 100.57 N/A N/A 100.00 88.40 93.87 N/A N/A

1.18-6GS-2.22 100.00 102.69 97.73 97.54 100.00 94.07 91.87 86.53 100.98

1.17-6GS-2.1 100.00 101.15 98.97 97.85 100.00 97.08 96.59 95.85 97.40

1.17-6GS-2.17 100.00 98.88 98.94 99.34 100.00 96.16 95.61 98.86 92.37

1.17-6GS-2.15 100.00 97.67 N/A N/A 100.00 99.14 99.77 N/A N/A

1.17-6GS-2.22 100.00 100.20 97.98 98.47 100.00 101.00 102.12 102.52 100.19

Long term stability of monovalent single domain antibodies up to 35 days was also tested and showed a good profile. b) Heat stability: Mirror ball

Purified V _H samples were incubated for 0-8 days at 40°C and then tested for binding to CHO cells expressing cynomolgus PSMA using the FMAT Direct Binding Assay as detailed in Examples 7(b). Molecules tested showed good stability. c) Assessment of V _H Serum stability using a Homogenous Time Resolved

Fluorescence (HTRF) Assay.

Purified V _H were mixed with cynomolgus monkey serum and incubated for 0-7 days at 37°C. Samples were then assessed for binding to PSMA using an HTRF assay. Briefly, PSMA (R&D Systems cat. no. 4234-ZN) was biotinylated using the Pierce EZ-Link Micro-Sulfo- NHS-LC- Biotinylation kit. (Thermo Scientific cat. no.21935). For HTRF binding assays all samples and reagents were prepared in HTRF assay buffer containing PBS, 0.1% (w/v) BSA and 0.4M Potassium Fluoride. V _H (C-terminally His-Myc tagged) were incubated with 3nM biotinylated PSMA, 1.5nM Streptavidin cryptate (Cisbio cat. no. 610SAKLA) and 10nM Anti- Myc-Alexa Fluor-647 (AbD Serotec cat. no. CA2200AF647) in a total assay volume of 10μΙ in black 384-shallow-well plates (Costar cat. no. 3676) for a minimum of 3 hours at room temperature. Time-resolved fluorescent emission at 620nm and 665nm was measured following excitation at 337nm on the BMG PHERAstar plate reader.

In another experiment, purified V _H were mixed with human serum for 0-7 days at 37oC and then assessed for binding to huPSMA CHO 1A10 cells as described in examples' 7(b) FMAT Direct cell Binding Assay. Data obtained is shown in and EC50 values are shown in Tables 29 and 30 below.

Table 29

Table 30

To assess the serum stability of the different biapartopic combinations the purified biparatopic V _H were mixed with human serum for 0-7 days at 37°C and then assessed for binding to huPSMA CHO cells as described in examples 7(b) FMAT Direct cell Binding Assay. Table 31 shows the EC50 values for the cell binding.

Table 31 EC50 values for biparatopic anti-PSMA V _H binding to PSMA expressing cell line.

Biparatopic binding molecule Days EC50

1.1-6GS-2.1 0 8.02E-11

1 1.03E-10

4 7.86E-11

7 7.88E-11

1.1-6GS-2.17 0 7.7E-11

1 9.16E-11

4 8.49E-11

7 7.42E-11

1.11-6GS-2.1 0 8.92E-11

1 6.05E-11

4 7.36E-11

7 8.65E-11

1.11-6GS-2.17 0 6.39E-11

1 7.25E-11

4 8.44E-11

7 1.01E-10

1.16-6GS-2.1 0 9.02E-11

1 8.60E-11

4 1.00E-10

7 1.07E-10

1.16-6GS-2.17 0 7.41E-11

1 9.44E-11

4 6.28E-11

7 6.75E-11

1.17-6GS-2.1 0 5.69E-11

1 4.77E-11

4 4.58E-11

7 5.44E-11

1.17-6GS-2.17 0 6.74E-11

1 3.32E-11 d) Assessment of V _H thermal stability

Differential scanning calorimetry (DSC) was conducted using a MicroCal VP-Capillary DSC (Malvern). 300 μΙ of protein at 0.25 mg/ml in PBS was run using a scan rate of 60 C per minute between 10 and 90 C Data was analysed using the MicroCal software. Results are shown in Table 32 for monovalent single domain antibodies and in Table 33 for biparatopic binding molecules.

Table 32

Table 32

Tonset

Name T _m (°C) T _½ (°C)

(°C)

1.1-6GS-2.1 67.63 57.06 6.37

1.1-6GS-2.17 65.60 58.39 3.52

1.1-6GS-2.15 61.28 50.36 3.69

1.1-6GS-2.22 64.39 57.01 3.53

1.16-6GS-2.1 64.18 54.28 9.07

1.16-6GS-2.17 62.98 53.08 5.37

1.16-6GS-2.15 58.97 48.07 4.03

1.16-6GS-2.22 61.54 51.97 4.86

1.1 1-6GS-2.1 65.75 54.00 7.56

1.1 1-6GS-2.17 64.36 55.80 4.03

1.1 1-6GS-2.15 60.05 50.81 3.52 1.1 1-6GS-2.22 63.07 54.00 4.02

1.18-6GS-2.1 63.89 53.15 9.57

1.18-6GS-2.17 62.98 52.92 5.70

1.18-6GS-2.15 60.75 48.67 7.38

1.18-6GS-2.22 61.75 51.68 5.04

1.17-6GS-2.1 66.58 54.49 7.22

1.17-6GS-2.17 64.84 56.45 4.20

1.17-6GS-2.15 60.69 51.29 3.86

1.17-6GS-2.22 63.23 53.83 4.53

EXAMPLE 10 Imaging studies in mice

V _H were injected in mice (V _H 1.1 , V _H 2.1 and V _H 2.1 with half-life extendsion). The mice contain PSMA positive (+) and PSMA negative (-) tumours. Studies were carried out as follows:

• -100 MBq of Tc-99m injected activity per mouse

• SPECT/CT at 5min, 30min, 60min, 3hrs, 6hrs & 24hrs.

images produced for different time points

Post imaging ex vivo biodistribution and autoradiography

Negative control V _H (aHEL4)

The half-life extended V _H comprises an anti-mouse serum albumin (anti-MSA) V _H with the following sequence:

QVQLVESGGGLVQPGGSLRLSCAASGFTFSSYAMSWVRQAPGKGLEWVATISDSGSSAD YADSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCARGRYNWNPRALGIWGQGTMVTV SS (SEQ ID NO: 528)

The experiments showed high levels of specific tumor targeting, faster penetration and greater accumulation of the injected dose to PSMA+ tumor, in particular compared to a control monoclonal IgG anti-PSMA antibody. This can be further improved by extending the half life of the V _H . Furthermore, the data shows quick clearance of the naked Humabody® V _H .

EXAMPLE 11 Epitope mapping

In tandem epitope mapping of PSMA binding VH against each other was carried out using Octet RED 384. V _H binding was then determined from the (reference sensor subtracted) sensorgram trace using 1 :1 binding models and ForteBio Octet DataAnalysis software. See also example 8b. The epitope binning results are shown in Table 33. Some clones showed partial blocking. Table 33

In a further experiment, epitope competition between single domain antibodies 1.1 and 2.1 was further characterised. PSMA was coupled onto AR2G biosensors using the amine coupling second generation kit (ForteBio) and then used for epitope binning experiments conducted using the Octet RED384. In these experiments each V _H was diluted to a concentration of 4ug/ml. Biosensors were loaded with no V _H or either 2.1 or 1.1 until binding to PSMA reached saturation level. These sensors were then briefly dipped into PBS/Tween before undergoing a second association step. The second association step involved dipping biosensors into wells containing the same V _H only or both 2.1 and 1.1. The presence of the first V _H in the later combination ensured that it continued to saturate its PSMA binding sites. The binding profiles were then studied using the ForteBio Analysis software. These data obtained demonstrate that single domain antibodies 2.1 and 1.2 bind distinct epitopes on PSMA.

EXAMPLE 12 Imaging studies

The following constructs were tested in these studies:

VH 2.1

VH 2.1-HIS. 1.2mg/ml

Sequence:

EVQLVESGGGVVQPGRSLRLSCAASGFSFSGYGMHWVRQAPGKGLEWVAYISYDGSNKY YADSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAKDPAWGLRLGESSSYDFDIWGQ GTMVTVSSLEGGGSEQKLISEEDLNHHHHHH (SEQ ID NO. 532)

VH 1.1

VH 1.1-HIS

Sequence:

EVQLLESGGGLVQPGGSLRLSCAASGFSFSSYAMSWVRQAPGKGLEWVSSIGENDGTTD YADSVKGRFTISRDNSKSMLYLQMNSLRVEDTAVYYCVKDGVHWGQGTLVTVSSLEGGGS EQKLISEEDLNHHHHHH (SEQ ID NO. 533) Hel4

HEL-4-HIS

Sequence:

EVQLLESGGGLVQPGGSLRLSCAASGFRISDEDMGWVRQAPGKGLEWVSSIYGPSGSTYY

ADSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCASALEPLSEPLGFWGQGTLVT VSSA

AAHHHHHH (SEQ ID NO. 534)

VH 2.1 - VH 2.1

VH 2.1-6GS- VH 2.1

Sequence:

EVQLVESGGGVVQPGRSLRLSCAASGFSFSGYGMHWVRQAPGKGLEWVAYISYDGSNKY

YADSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAKDPAWGLRLGESSSYDFDI WGQ

GTMVTVSSGGGGSGGGGSGGGGSGGGGSGGGGSGGGGSEVQLVESGGGWQPGRSL

RLSCAASGFSFSGYGMHWVRQAPGKGLEWVAYISYDGSNKYYADSVKGRFTISRDNS KNT

LYLQMNSLRAEDTAVYYCAKDPAWGLRLGESSSYDFDIWGQGTMVTVSSAAAHHHHH H

(SEQ ID NO. 535)

VH 2.1 - VH 1.1

VH 2.1-6GS- VH 1.1

Sequence:

EVQLVESGGGVVQPGRSLRLSCAASGFSFSGYGMHWVRQAPGKGLEWVAYISYDGSNKY YADSVKGRFTISRDNSKNTLYLQMNSLRAEDTAVYYCAKDPAWGLRLGESSSYDFDIWGQ GTMVTVSSGGGGSGGGGSGGGGSGGGGSGGGGSGGGGSEVQLLESGGGLVQPGGSLR LSCAASGFSFSSYAMSWVRQAPGKGLEWVSSIGENDGTTDYADSVKGRFTISRDNSKSML YLQM NSLRVEDTAVYYCVKDGVHWGQGTLVTVSSAAAH H H H H H (SEQ ID NO. 536)

All V _H domains used in this study were expressed in E.coli. The proteins were purified from filtered supernatant using nickel affinity chromatography and size exclusion chromatography (SEC) as described in example 7a. After buffer exchange into storage buffer, the some proteins were concentrated using spin concentrators. The protein purity was analysed using SDS-PAGE and analytical SEC. Binding to PSMA was checked using recombinant protein and/or cells expressing PSMA. Stability was checked by heating the protein to 40°C for an extended period of time (ranging from overnight to 4 weeks) and measuring the degree of protein degradation. Aliquots of the proteins were stored at -80°C until use.

Confocal fluorescence microscopy method to test the occurrence of co-localization between the V _H of interest (in a monovalent, bivalent and biparatopic format) and the markers of endocytosis LAMP-1 (staining lysosome) and EEA-1 (staining early endosome) in a PSMA expressing cell line. An IgG benchmark antibody that binds to PSMA was used as a positive control. The results are shown in Figures 20-24 and demonstrate improved internalisation of bivalent and biparatopic V _H constructs.

Experimental protocol

The cell line used was a CHO T-REx huPSMA cell line.

1) CHO T-REx huPSMA cells were induced with tetracycline for PSMA expression the day before the experiment and plated on coverslips.

2) On the following day cells were incubated with media comprising the test V _H (either in their monovalent, bivalent or biparatopic format) at 500nM or with the positive control.

3) Samples were first incubated on ice for 30min to block endocytosis and then fixed with 4% PFA 10min at RT, followed by 3 washes in PBS. Duplicate samples are further incubate at 37°C for 2 hrs to trigger endocytosis, then fixed.

4) After fixation samples, were permeabilized with buffer.

5) Cells that were incubated with the positive control were stained using an anti-human-488 antibody diluted 1 :2000 in 0.5%BSA/ PBS+0.05% Tween for 1 hr, followed by three washes in

PBS+0.05% Tween (5 min each).

6) Cells that were incubated with monovalent or bivalent /biparatopic test V _H were stained using a primary anti-HIS antibody (mouse) for 1 hr, followed by washes, and then incubated with the secondary anti-mouse 488 antibody for 1 hr, followed by washes.

7) Lysosomes and endosomes are stained using a primary antibody against either the early endosome antigen 1 (EEA-1) or the lysosome membrane antigen 1 (LAMP-1) (both rabbit) for 1 hr. Cells are further incubated for 1 hr RT with anti-rabbit-647 secondary antibody, followed by washes.

8) All samples are also stained with HOECHST 1 : 1000 (0.5ug/ml) for 5 min then washed. 9) Coverslips are mounted into frosty end slides and imaged using a NIKON A1 R confocal system.

Pictures were taken using the program NIS-ELEMENTS AR.

Laser lines used were: 407.7nm (HOECHST), 487.7nm (VH/monoclonal benchmark), 639.7 (LAMP-1 , EEA-1)

Objective: Apo 60x Oil AS DIC N2

For confocal mode: Pinhole Size (urn): 39.6, Z step: 0.49um.

Further imaging studies were conducted using CHO cells expressing human PSMA (15000/well) were seeded onto 96 well Poly-L-Lysine (Sigma P4707) coated plates (Perkin Elmer 6005550) in Hams F12 (Sigma N6658) media containing 10% Foetal Bovine Serum, 2mM L-Glutamine, 10pg/ml Blasticidin, 300 g/ml Zeocin, penicillin/streptomycin, 1 pg/ml Tetracycline and incubated overnight in a C0 ₂ incubator at 37°C. VH were added to the plates and incubated at 4°C for 30 minutes following by 37°C for 2 hours. Plates were washed three times with PBS then the cells fixed in 4% paraformaldehyde and permeabilised with 0.5% saponin. Internalized VH were detected by staining with anti-His (Millipore 05-949) and anti-mouse AF488 (Jackson ImmunoResearch 115-545-098). Lysosomes were stained with LAMP-1 (Abeam Ab24170) and anti-rabbit AF647 (Jackson ImmunoResearch 11 1-605- 008). Nuclei were stained using Hoescht stain (Life technologies H3570). Plates were imaged using the IN Cell Analyzer 6000 and Images processed using ImageJ software. The results are shown in Figure 25. EXAMPLE 13 POTENCY OF M AE TOXIN CONJUGATED TO BINDING MOLECULES IN VITRO

The ability of MMAE-toxin-conjugated V _H to internalize into PSMA-expressing cells resulting in cell killing was determined using an in vitro cytotoxicity assay. Human cells (DU-145, ATCC HTB-81 ) stably expressing human PS A or matched PSMA negative cells were seeded into 384-well black clear-bottomed tissue culture treated assay plates at 3000 cells per well in RPMI 1640 medium containing 10% foetal bovine serum, 2mM L-Glutamine, 1X penicillin/streptomycin, and incubated overnight in a C0 ₂ incubator at 37 'C. Cells were then incubated with serially-diluted MMAE-toxin-conjugated V _H for 48 or 72 hours. Untreated control wells (cells in the absence of toxin-conjugated V _H ) and background control wells (media only) were set up on each plate for data normalization. Cell killing was determined following the incubation using the Cell Titer-Glo Cell Viability assay (Promega G7571) according to the manufacturer's instructions. Relative luminescent signal (RLU) was measured using the BMG PHERAstar plate reader. The data was normalized by subtraction of the RLU signal obtained in the background control wells then expressed as a % of the untreated control wells (% survival). Figure 26 illustrates dose response curves obtained using a human-PSMA-expressing human cell line and the matched parent (i.e. non- transfected) PSMA negative cell line in a representative experiment (48 hour incubation). IC ₅₀ values and maximum % cell killing obtained for the MMAE-conjugated constructs are summarized in Table 20. Crescendo's Humabody® V _H were conjugated to MMAE using HiPEG™ technology (WO 2009/047500; Cong et al., (2012) Bioconjugate Chem. 2012, 23, 248-263); the positive ADC control was generated using ThioBridge™ technology (WO 2016063006; WO 2005/007197; Balan et al., (2007) Bioconjugate Chem., 18, 61-76). The anti-PSMA-MMAE-conjugated V _H specifically killed PSMA positive cells with minimal cell killing observed for the PSMA negative control cell line. The biparatopics that consist of two V _H targeting different epitopes of the PSMA were more potent than the monovalent or bivalent PSMA V _H constructs. The DU145 assay was performed with a 48h and with a 72h HDC incubation. This had an impact on the IC ₅₀ values measured and the % maximum kill, but was not expected to affect the ranking of the different HDC formats. For screening, a 48h incubation was preferred for higher throughput. Using the 48h incubation none of the constructs tested reached 100 % cell kill (even at the highest concentrations tested). The maximum response levelled off at approx. 70-85 % (see Table 34). Table 35 shows the IC ₅₀ values and Figure 27 illustrates the higher maximum % cell killing observed using a 72 hour incubation time (n=1 data).

Table 34. Summary of in vitro cytotoxicity data obtained with the human-PSMA-expressing human cell line following a 48 hour incubation.

Construct DAR Mean IC ₅₀ ± SD IC50

(nM), Toxin

Mean Max % Cell (nM) kill, (n number)

Hi PEG™ A-Hise val-cit- Monovalent 2.1-myc- 1 1.2 ± 0.7nM 1.16

PAB- MAE his Max cell kill 74%

(n= 4)

Hi PEG™ B-His ₆ val-cit- Monovalent 1.1-myc- 0.9 2.7 ± 2.5nM 2.43 PAB- AE his Max cell kill 73%

(n= 4)

HiPEG™ C-His ₆ val-cit- Monovalent 3.1-myc- 1 5.2 ± 2.6nM 5.21 PAB- AE his Max cell kill 59%

(n= 4)

HiPEG™ D-His ₆ val-cit- Monovalent HEL4-his >300nM (n= 3)

PAB-MMAE

HiPEG™ A-2-A-His ₆ val- Bivalent 2.1- 1 0.32 ± 0.2nM 0.32 cit-PAB-MMAE (G4S)6- Max cell kill 57%

2.1 (n= 3)

HiPEG™ B-2-B-His ₆ val- Bivalent 1.1- 0.7 18 ± 8nM 12.6 cit-PAB-MMAE (G4S)6- (n= 3)

1.1 Max cell kill 80%

(Estimated)

HiPEG™ C-2-C-His ₆ val- Bivalent 3.1- 1 4.5 ± 2.4nM 4.54 cit-PAB-M AE (G4S)6- Max cell kill 69%

3.1 (n= 3)

HiPEG™ A-1-B-HiSe val- Biparatopic 2.1- 1 0.67 ± 0.3n 0.67 cit-PAB- MAE (G4S)2- Max cell kill 75%

1.1 (n=4)

Hi PEG™ A-2-B-HiSs val- Biparatopic 2.1- 1 0.37 ± 0.1 n 0.37 cit-PAB- MAE (G4S)6- Max cell kill 78%

1.1 (n=3)

Hi PEG™ B-1-A-HiSe val- Biparatopic 1.1- 1 0.13±0.1nM 0.13 cit-PAB-MMAE (G4S)2- Max cell kill 79%

2.1 (n=3)

Hi PEG™ B-2-A-HiSe val- Biparatopic 1.1- 1 0.15±0.1nM 0.15 cit-PAB-MMAE (G4S)6- Max cell kill 79%

2.1 (n=3)

ThioBridge™ anti-PSMA Control control 4 0.03 ± 0.02nM 0.13 val-cit-PAB- AE ADC ADC Max cell kill 82%

(n=3)

Table 35. Summary of in vitro cytotoxicity data obtained with the human-PSMA-expressing human cell line following a 72 hour incubation.

The order of potency observed for the monovalent constructs was V _h 2.1 >VH1.1 >V _h 3.1.

The V _H 2.1 bivalent construct was observed to be approximately 3-fold more potent than the V _H 2.1 monovalent construct, however the max kill% was reduced when using the bivalent construct.

The V _H 1.1 bivalent construct was observed to be approximately 6-fold less potent than the V _H 1.1 monovalent construct.

The V _H 3.1 bivalent construct had comparable activity to the V _H 3.1 monovalent construct, with a slightly improved max kill % being observed. The order of the VH in the biparatopic construct was found to impact on activity, with 2.5 to 4.6-fold differences being observed. The biparatopic construct in the orientation (N-C) V _H 2.1- V _H 1.1 was observed to be less active than when in the orientation V _H 1.1-VH2.1.

The linker length was observed to have a minimal impact on activity (1.2 to 2.2 fold) in the experiments performed. However for some constructs tested the (G4S)6 linker version was slightly more active.

The biparatopic constructs showed improved activity over the monovalent constructs. The most active biparatopic was found to be approximately 7-fold more active than the most active monovalent.

The most active biparatopic was 4.7-fold less active than the control anti-PSMA mAb; however the DAR for the mAb was 4, whereas the DAR for the biparatopic construct was 1. All constructs showed the expected potency, with the biparatopic 1.1-2.1 HDC being of comparable potency when compared to the control ADC, when calculating the IC ₅₀ with respect to the toxin concentration.

Procedure for the Preparation of Humabody™ drug conjugates (HDCs) A stock solution of conjugation reagent, HiPEG™ val-cit-PAB-MMAE (Figure 28), was prepared in MeCN prior to performing conjugation reactions. A solution of Humabody™ (0.9 mg/mL in PBS; 20 mM EDTA, pH 7.5) was mixed gently with HiPEG™ val-cit-PAB-MMAE reagent (1.5 equiv. per Humabody™; 5% (v/v) final MeCN concentration) and incubated at 22 °C for 19 h. After 19 h, the conjugation reaction was mixed with an equal volume of 600 mM sodium phosphate buffer (150 mM NaCI; 20 mM EDTA), pH 7.5 and cooled to 4 °C. A stock solution of 1 mg/mL NaBH ₄ solution was prepared in 0.1 M NaOH. Two aliquots each of NaBH ₄ solution, (10 equiv. per reagent), were added to the cooled conjugation reaction with a 30 min interval between additions. After a further 30 min interval, the crude mixture was purified by hydrophobic interaction chromatography (HIC) using a TOSOH ToyoPearl Phenyl-650S column. The sample was bound and washed onto the column using 50 mM sodium phosphate (2 M NaCI), pH 7 (buffer A) and eluted using a gradient of 50 mM sodium phosphate (20% v/v isopropanol), pH 7 (buffer B). Fractions containing the mono-loaded product were pooled and concentrated using Vivaspin20 concentrators fitted with 5 kDa MWCO PES membranes. The concentrated fractions were buffer exchanged into DPBS using PD10 columns and the buffer exchanged material sterile filtered using 0.2 μηι PVDF syringe filtration unit. The HiPEG val-cit-PAB-MMAE moiety is attached via a C terminal His6-tag on a V _H . Two histidines are needed for attachment of each "payload" toxin molecule. Humabody V _H , DAR=1 species were purified for use in cytotoxicity studies, in some instances an exact DAR of 1 was not achieved (see table below). In the examples herein a single MMAE moiety was attached, but multiple payloads are possible (DARs > 1). Procedure for the Preparation of control ADC with Drug : Antibody Ratio (DAR) of 3.5

Positive control antibody Pro_006 is an anti-PSMA antibody composed of heavy and light chain sequences described within US8470330 and exemplified as antibody 006.

Conjugation 1 : A solution of mAb Pro_006 (5.07 mg/mL) in reaction buffer (20 mM sodium phosphate, 150 mM NaCI; 20 mM EDTA, pH 7.5), was warmed to 40 °C for 15 min. TCEP (5 mM, 2 equiv. per mAb) was added to the mAb solution, mixed gently and incubated at 40 °C for 1 h. A stock solution of conjugation reagent, mc-val-cit-PAB-MMAE (Figure 29) was prepared in DMF at 2.8 mM. The reduced mAb was cooled to 22 °C, diluted to 4.2 mg/mL with reaction buffer and mc-val-cit-PAB-MMAE (5.25 equiv. per mAb) was added. The conjugation mixture was incubated at 22 °C for 2 h. The crude conjugation mixture was treated with 50 mM /V-acetyl-L-cysteine (20 equiv. over reagent) at 22 °C for 30 min. The reaction mixture was diafiltered against DPBS using a Vivaspin20 concentrator fitted with 30 kDa MWCO PES membranes. The diafiltered ADC solution was buffer exchanged into DPBS using a Centripure P50 column. The DAR of the sample was assessed by HIC (average DAR = 3.21). Conjugation 2: A solution of mAb Pro_006 (5.07 mg/mL) in reaction buffer (20 mM sodium phosphate 150 mM NaCI; 20 mM EDTA), pH 7.5 was warmed to 40 °C for 15 min. TCEP (5 mM, 2.75 equiv. per mAb) was added to the mAb solution, mixed gently and incubated at 40 °C for 1 h. A stock solution of conjugation reagent, mc-val-cit-PAB-MMAE (Figure 29) was prepared in DMF at 4.0 mM. The reduced mAb was cooled to 22 °C, diluted to 4.2 mg/mL with reaction buffer and mc-val-cit-PAB-MMAE (7 equiv. per mAb) was added. The conjugation mixture was incubated at 22 °C for 2 h. The crude conjugation mixture was treated with 50 mM /V-acetyl-L-cysteine (20 equiv. over reagent) at 22 °C for 30 min. The reaction mixture was diafiltered against DPBS using a Vivaspin20 concentrator fitted with 30 kDa MWCO PES membranes. The diafiltered ADC solution was buffer exchanged into DPBS using a Centripure P50 column. The DAR of the sample was assessed by HIC (average DAR = 4.52).

Production of average DAR 3.5 ADC: ADC 1 (DAR 3.21) and ADC 2 (DAR 4.52) were mixed in a 4: 1 mol ratio to prepare an ADC with intermediate DAR. The resulting sample was sterile filtered using 0.2 μηι PVDF syringe filtration unit. The DAR of the sample was assessed by HIC (average DAR = 3.45).

In vitro potency of half-life extended HDCs

The in vitro potency of half-life extended HDCs was assessed using the DU145 cell killing assay (72h).

This material described in Table 36 was generated to test the effect of adding a half-life extension moiety to the HDCs. Half-life-extended versions (HLE) were generated using the MSA-binding V _H (SEQ ID No.528). In vitro potency was assessed using the DU145 cell killing assay (72h). Figure 30 A & B show_IC ₅₀ values observed in the PSMA-DU 145 cytotoxicity assay (72h) for: Control ADC mAB-MMAE (■), 2.1 6GS-1.1-MMAE biparatopic (A), 2.1-6GS- 1.1-MMAE-HLE half-life extended biparatopic (T), HEL4-MMAE Monovalent (·) and HEL4- HLE-MMAE Monovalent half-life extended (I), for (A) DU145 expressing PSMA and (B) DU145 parental cells that have not been modified to express PSMA.

Table 36 IC ₅₀ values PSMA-DU145 cytotoxicity assay (72h):

Format V _H Name DAR ICso ICso Average

(nM) (toxin) Max Cell

(nM) Kill %

Monovalent HEL4 HiPEG™ HEL4-His 1 >100 >100

val-cit-PAB-MMAE

Biparatopic 1.1-6GS-2.1 HiPEG™ 1.1-6GS- 1 0.27 0.27 86

2.1 -His val-cit- PAB-MMAE

Biparatopic- 1.1-6GS- HiPEG™ 1.1-6GS- 1 0.82 0.82 82

HLE 2.1-6GS- 2.1-6GS- half life

half life extension -His val- extension cit-PAB-MMAE

Monovalent HEL4-6GS- HiPEG™ HEL4- 1 >100 >100 -HLE half life 6GS- half life

extension extension -His val- cit-PAB-MMAE mAb Control Pro_006-mc-val- 3.5 0.061 0.2135 89 cit-PAB-MMAE

PSMA

mAb-MMAE