REN, Maozhi (1459 Willowgrove Court, Saskatoon, Saskatchewan, S7W 0B1, CA)
QIU Shuqing (1 7th Street East, Saskatoon Saskatchewan, S7H 026, 1-1901, CA)
SELVARAJ, Gopalan (540 Nesslin Crescent, Saskatoon Saskatchewan, S7J 4V5, CA)
DATLA, Raju (527 Bayview Terrace, Saskatoon Saskatchewan, S7V 1B6, CA)
REN, Maozhi (1459 Willowgrove Court, Saskatoon, Saskatchewan, S7W 0B1, CA)
QIU Shuqing (1 7th Street East, Saskatoon Saskatchewan, S7H 026, 1-1901, CA)
SELVARAJ, Gopalan (540 Nesslin Crescent, Saskatoon Saskatchewan, S7J 4V5, CA)
| Claims 1 A method of regulating growth and development in a plant comprising introducing into the plant a nucleic acid molecule encoding a target of rapamycin (TOR)-ιnteractιng protein (TIP) under conditions whereby the nucleic acid molecule is over-expressed thereby altering plant growth and development compared to a wild-type plant grown under the same conditions 2 The method according to claim 1 , wherein the altered plant growth and development comprises an altered phenotype compared to a phenotype of a wild-type plant grown under the same conditions 3 The method according to claim 2, wherein the altered phenotype comprises increased cell number, increased leaf size, increased meπstem size, increased stem size, increased nutπent-use-efficiency increased water-use-efficiency, increased seed size, increased seed number, increased flower number earlier flowering increased branching, increased silique size, increased silique number, multiple sihques in one flower, increased gyπoecium size increased oil content or any combination thereof, compared to a wild-type plant grown under the same conditions 4 The method according to claim 2, wherein the altered phenotype comprises increased nutπent-use-effιcιeπcy 5 The method according to claim 2 wherein the altered phenotype comprises increased nitrogen-use-efficiency and/or potassium-use-efficiency 6 The method according to claim 2 wherein the altered phenotype comprises earlier flowering time 7 The method according to claim 2 wherein the altered phenotype comprises more flowers 8 The method according to claim 2 wherein the altered phenotype comprises increased seed size 9 The method according to claim 2, wherein the altered phenotype comprises increased seed yield 10 The method according to claim 2 wherein the altered phenotype comprises larger stems and/or meristems 1 1 The method according to claim 2 wherein the altered phenotype comprises larger siliques 12 The method according to claim 2 wherein the altered phenotype comprises more siliques 13 The method according to claim 2, wherein the altered phenotype comprises more branches 14 The method according to claim 2 wherein the altered phenotype comprises higher oil content 15 The method according to any one of claims 1 to 14 wherein the TIP comprises an amino acid sequence having at least 85% sequence identity to the amino acid sequence as set forth in SEQ ID NO 36, SEQ ID NO 34, SEQ ID NO 8, SEQ ID NO 6, SEQ ID NO 12, SEQ ID NO 10, SEQ ID NO 4, SEQ ID NO 14, SEQ ID NO 16, SEQ ID NO 18, SEQ ID NO 20 SEQ ID NO 22 SEQ ID NO 24, SEQ ID NO 26 SEQ ID NO 28, SEQ ID NO 30, SEQ ID NO 32, SEQ ID NO 38 SEQ ID NO 40, SEQ ID NO 42 or SEQ ID NO 79, or a conservatively substituted ammo acid sequence thereof 16 The method according to any one of claims 1 to 14, wherein the TIP comprises the amino acid sequence as set forth in SEQ ID NO 36 SEQ ID NO 34, SEQ ID NO 8, SEQ ID NO 6 SEQ ID NO 12, SEQ ID NO 10 SEQ ID NO 4 SEQ ID NO 14 SEQ ID NO 16, SEQ ID NO 18, SEQ ID NO 20 SEQ ID NO 22 SEQ ID NO 24, SEQ ID NO 26, SEQ ID NO 28 SEQ ID NO 30, SEQ ID NO 32 SEQ ID NO 38 SEQ ID NO 40, SEQ ID NO 42 or SEQ ID NO 79 17 The method according to any one of claims 1 to 16, wherein the nucleic acid molecule comprises a nucleotide sequence having at least 85% sequence identity to the nucleotide sequence as set forth in SEQ ID NO 35 SEQ ID NO 33 SEQ ID NO 7, SEQ ID NO 5 SEQ ID NO 1 1 , SEQ ID NO 9, SEQ ID NO 3 SEQ ID NO 13, SEQ ID NO 15, SEQ ID NO 17 SEQ ID NO 19 SEQ ID NO 21 SEQ ID NO 23 SEQ ID NO 25 SEQ ID NO 27, SEQ ID NO 29 SEQ ID NO 31 SEQ ID NO 37 SEQ ID NO 39 SEQ ID NO 41 or SEQ ID NO 78 or a codon degenerate nucleotide sequence thereof 18 The method according to any one of claims 1 to 16 wherein the nucleic acid molecule comprises the nucleotide sequence as set forth in SEQ ID NO 35 SEQ ID NO 33 SEQ ID NO 7 SEQ ID NO 5 SEQ ID NO 1 1 SEQ ID NO 9 SEQ ID NO 3 SEQ ID NO 13 SEQ ID NO 15 SEQ ID NO 17 SEQ ID NO 19 SEQ ID NO 21 SEQ ID NO 23 SEQ ID NO 25 SEQ ID NO 27 SEQ ID NO 29 SEQ ID NO 31 SEQ ID NO 37 SEQ ID NO 39 SEQ ID NO 41 or SEQ ID NO 78 or a codoπ degenerate nucleotide sequence thereof 19 The method according to any one of claims 1 to 18 wherein the plant is Arabidopsis thaliana Brassica spp Borago spp Ricinus spp Theobroma spp Zea spp Gossypium spp Crambe spp Cuphea spp Linum spp Lesquerella spp Limnanthes spp Linola spp Tropaeolum spp Oenothera spp Olea spp Elaeis spp Arachis spp Carthamus spp Glycine spp Soya spp helianthus spp Nicotiana spp Vernonia spp Tπticum spp Hordeum spp Or/za spp /Wena spp Sorghum spp Secale spp Medicago sativa Lens culinaπs or C/cer aπetinum 20 The method according to any one of claims 1 to 18 wherein the plant is /A thaliana B napus B oleracea B rapa B caπnata or S juncea 21 A method of regulating growth and development in a plant comprising silencing a native nucleic acid molecule encoding a target of rapamycin (TOR)-ιnteractιng protein (TIP) under conditions whereby silencing the native nucleic acid molecule alters plant growth and development compared to a wild-type plant grown under the same conditions 22 The method according to claim 21 wherein the altered plant growth and development comprises an altered phenotype compared to a phenotype of a wild-type plant grown under the same conditions 23 An isolated or purified polypeptide compπsirg an ammo acid sequence having 85% sequence identity to the amino acid sequence as set forth in SEQ ID NO 8 SEQ ID NO 12 SEQ ID NO 16 SEQ ID NO 20 SEQ ID NO 26 SEQ ID NO 30 SEQ ID NO 36 or SEQ ID NO 42 24 The isolated or purified polypeptide according to claim 23 comprising the amino acid sequence as set forth in SEQ ID NO 8 SEQ ID NO 12 SEQ ID NO 16 SEQ ID NO 20 SEQ ID NO 26 SEQ ID NO 30 SEQ ID NO 36 or SEQ ID NO 42 25 An isolated or purified nucleic acid molecule comprising a nucleotide sequence having 85% sequence identity to the nucleotide sequence as set forth in SEQ ID NO 7 SEQ ID NO 1 1 SEQ ID NO 15 SEQ ID NO 19 SEQ ID NO 25 SEQ ID NO 29 SEQ ID NO 35 or SEQ ID NO 41 26 The isolated or purified nucleic acid molecule according to claim 25 comprising the nucleotide sequence as set forth in SEQ ID NO 7 SEQ ID NO 1 1 SEQ ID NO 15 SEQ ID NO 19 SEQ ID NO 25 SEQ ID NO 29 SEQ ID NO 35 or SEQ ID NO 41 or a codon degenerate nucleotide sequence thereof 27 A plant cell plant seed or plant having introduced therein a nucleic acid molecule encoding a target of rapamycin (TOR)-ιnteractιng protein (TIP) expression of the nucleic acid molecule altering growth and development of the ceil seed or plant in comparison to a cell seed or plant in which the nucleic acid molecule is not introduced 28 The plant cell plant seed or plant according to claim 27 wherein the nucleic acid molecule comprises a nucleotide sequence having 85% sequence identity to the nucleotide sequence as set forth in SEQ ID NO 1 SEQ ID NO 3 SEQ ID NO 5 SEQ ID NO 7, SEQ ID NO 9 SEQ ID NO 1 1 , SEQ ID NO 13, SEQ ID NO 15 SEQ ID NO 17 SEQ ID NO 19 SEQ ID NO 21 SEQ ID NO 23, SEQ ID NO 25 SEQ ID NO 27 SEQ ID NO 29, SEQ ID NO 31 SEQ ID NO 33 SEQ ID NO 35, SEQ ID NO 37 SEQ ID NO 39 or SEQ ID NO 41 29 The plant cell, plant seed or plant according to claim 27 wherein the nucleic acid molecule comprises the nucleotide sequence as set forth in SEQ ID NO 1 , SEQ ID NO 3, SEQ ID NO 5 SEQ ID NO 7 SEQ ID NO 9 SEQ ID NO 1 1 SEQ ID NO 13 SEQ ID NO 15 SEQ ID NO 17, SEQ ID NO 19, SEQ ID NO 21 SEQ ID NO 23 SEQ ID NO 25, SEQ ID NO 27 SEQ ID NO 29 SEQ ID NO 31 SEQ ID NO 33 SEQ ID NO 35 SEQ ID NO 37 SEQ ID NO 39 or SEQ ID NO 41 or a codon degenerate nucleotide sequence thereof 30 The plant cell, seed or plant according to any one of claims 27 to 29 which is Arabidopsis thaliana, Brassica spp , Borago spp , Ricinus spp , Theobroma spp , lea spp Gossypium spp , Crambe spp Cuphea spp Linum spp , Lesquerella spp Limnanthes spp Linola spp Tropaeolum spp , Oenothera spp Olea spp Elaeis spp , Arachis spp , Carthamus spp Glycine spp , Soja spp , Helianthus spp , Nicotiana spp Vernonia spp , Triticum spp Hordeum spp Oryza spp Avena spp Sorghum spp , Secale spp , Medicago sativa Lens culinans or Cicer arietinum 31 The plant cell seed or plant according to any one of claims 27 to 29 which is A thaliana B napus B oleracea B rapa B carinata or S juncea |
This application is a continuation-in-part of International Patent Application PCT/CA2009/00121 1 filed September 1 2009 and claims the benefit of United States Provisional Patent Application Serial No 61/193 809 filed December 24 2008 the entire contents of both of which are herein incorporated by reference
Field of the Invention
This invention relates generally to biotechnology and, more particularly to the modification of plant growth and development and the enhancement of crop performance through manipulation of TOR gene expression and TOR interacting protein (TIPs) gene expression
Background of the Invention
TOR (target of rapamycin) encodes a large Ser/Thr protein kinase which is structurally and functionally conserved in eukaryotic species from yeast to animals to plants TOR is a catalytic subunit of a large protein complex and plays a central role in the regulation of cell growth differentiation, proliferation, survival, protein synthesis and transcription by integrating signals from hormones nutrients and the environment (De Virgilo 2006 Wullschleger 2006, lnoki 2006)
In yeast TOR is encoded by two genes (TOR1 and TOR2), which have 80% overall amino acid similarity and interacts with other regulatory proteins to form two distinct complexes TOR complex 1 (TORC1 ) and TOR complex 2 (TORC2) respectively TORC1 in yeast is inhibited by rapamycin and is responsive to nutrient and growth factor cues to regulate temporal cell growth and metabolism while TORC2 is not inhibited by rapamycin and is implicated in the regulation of cytoskeleton and spatial aspects of cell growth such as cell polarity (De Virgilo 2006 Weissman 2001 )
In contrast to yeast other eukaryotes possess only a single TOR gene but as in yeast TOR exists in two distinct complexes TORC 1 and TORC2 In mammals and C elegans TORC1 is rapamycin sensitive while TORC2 is insensitive The Arabidopsis genome contains only one copy of TOR which is insensitive to rapamycin It remains to be determined if there are two functional TOR complexes in plants analogous to other eukaryotes (Loewth 2002 Wullschleger 2006) The TOR protein possesses several different functional domains The N-terminal 1200 residues consist of 20 HEAT repeats which typically mediate protein-protein interactions Following the HEAT repeat region is the focal adhesion target (FAT) domain which has been suggested to facilitate protein binding The TOR protein further comprises the FRB domain the binding site for the FKBP-rapamycin complex The catalytic serine/threonine kinase domain which contains a conserved lipid kinase motif is adjacent to FATC domain a putative scaffolding domain, which is located at the extreme carboxyl terminus (Kunz 2000 Andrade 1995, Bosotti 2000 Zheng 1995)
TOR1 knockout yeast strains display small cell size, slow growth rate, and hypersensitivity to temperature and osmotic stress In contrast, loss of TOR2 function arrests growth in the early G1 phase of the cell cycle In mice disruption of TOR causes lethality at embryonic day 5 5 (E5 5) and proliferation arrest in embryonic stem cells The protein sequence of TOR from Arabidopsis shows 60% and 59% identity with TOR2 and
TOR1 from yeast Disruption of AtTOR leads to the premature arrest of endosperm and embryo development at a very early globular stage, (16-64 cells) (Barbet 1996, Gangloff
2004 Murakamie 2004, Menand 2002, Mahfouz 2006)
In yeast and mammals inhibition of the TOR signaling pathway by nutrient starvation or rapamycin treatment leads to a rapid down regulation of 18S, 5 8S, 25S and 5S rRNA synthesis and subsequent transcription of the majority of the 130 πbosome protein genes The rate of cell proliferation and growth directly depends on the rate of protein synthesis, and in turn protein synthesis depends on ribosome biogenesis Ribosome biogenesis requires coordination of the production of ribosome components including 4 different rRNA molecules and 130 ribosome proteins TOR is suggested be a central regulator for ribosome biogenesis through RNA polymerase I dependent modulation of 18S 5 8S and 25S πbosomal RNA transcription (RNA polymerase Il drives expression of ribosome proteins and RNA polymerase III controls 5SrRNA synthesis) (Warner 2001 Powers 1999)
Plant growth and development is highly dependent on environmental interactions that are pivotal for survival Plants adjust growth and development in relation to nutrient availability light intensity water availability and additional environmental parameters The mechanisms that are involved in the perception and transduction of these environmental cues are poorly understood (Mahfouz 2006 Deprost 2007)
There remains a need for methods of regulating plant growth and development Summary of the Invention
Recently it has been appreciated that growth in plants is positively correlated with expression of the (TOR) gene and that TOR may be fundamentally involved in control of growth and development The TOR signaling network comprises a complex nexus of regulatory proteins that when manipulated by silencing or over-expression lead to many different changes in plant growth and development
The present invention relates to AtTOR nucleic acid molecules and proteins from Arabidopsis thaliana and BnTOR nucleic acid molecules and proteins from Brassica napus that are important controlling factors for the regulation of growth and development in plants The present invention further relates to 30 or more TOR-lnteracting Proteins, (TIPs) that form part of a regulatory protein complex that affects many aspects of growth and development, and to nucleic acid molecules encoding the TlPs
The present invention further relates to a method of regulating plant growth and development More specifically the present invention relates to the expression of nucleic acid molecules of the present invention in recombinant plants to effect changes in plant growth and development
Thus, there is provided a method of regulating growth and development in a plant comprising introducing into the plant a nucleic acid molecule encoding a target of rapamycin (TOR)-ιnteractιng protein (TIP), a target of rapamycin (TOR) protein or a protein kinase domain of a target of rapamycin (TOR) protein, under conditions whereby the nucleic acid molecule is over-expressed thereby altering plant growth and development
The present invention further relates to a method of increasing πbosome biogenesis by increasing πbosomal RNA and ribosomal protein synthesis in a plant cell comprising introducing into the plant cell a nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein under conditions whereby the nucleic acid molecule is over-expressed thereby increasing ribosomal RNA expression and πbosome biogenesis in the plant cell
The present invention further relates to decreasing πbosome biogenesis by decreasing πbosomal RNA expression and πbosome protein synthesis in a plant cell comprising silencing a native nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein thereby decreasing πbosome biogenesis and ribosomal RNA expression in the plant cell The present invention further relates to a method of altering phenotype of a plant comprising over-expressing in the plant a nucleic acid molecule encoding a target of rapamycin (TORj protein a protein kinase domain of a TOR protein, or a TOR-interacting protein (TIP) Phenotypic changes that may result from over-expression of a nucleic acid molecule encoding a TOR protein, a protein kinase domain of a TOR protein or a TOR-interacting protein (TIP) in a plant include, for example increased cell number, increased leaf size increased meristem size increased stem size, increased nutπent-use-efficiency (e g nitrogen and/or potassium use efficiency), increased water-use-efficiency increased seed size increased seed number, increased flower number earlier flowering shorter or longer life span, increased branching, increased silique size, increased silique number, multiple siliques in one flower, increased gynoecium size, increased oil content or any combination thereof, compared to a wild-type plant grown under the same conditions
In one embodiment, over-expression of a nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein in a plant results in a phenotypic change in the plant, for example increased cell number, increased cell size, increased water-use-efficiency increased seed size, increased seed number, earlier flowering or any combination thereof, compared to a wild-type plant grown under the same conditions In one embodiment, there is provided a method of modulating the flowering time of a plant comprising introducing into cells of said plant a nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein under conditions whereby the nucleic acid molecule is over-expressed thereby modulating the flowering time of said plant Preferably, the method reduces the time required for a plant to commence flowering and complete the life cycle (seed to seed)
In one embodiment, there is provided a method of increasing the size of seed produced by a plant said method comprising introducing into cells of said plant a nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a
TOR protein under conditions whereby the nucleic acid molecule is over-expressed thereby increasing seed size of said plant
In one embodiment there is provided a method of increasing the drought (water stress) tolerance of a plant said method comprising introducing into cells of said plant a nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein under conditions whereby the drought tolerance of said plant is increased
There is also provided a method of regulating growth and development in a plant comprising silencing in the plant expression of a TOR protein a protein kinase domain of a TOR protein or a protein that interacts with TOR Regulation of growth and development can lead to altered phenotypes that are commercially useful
There is also provided a use of a TOR protein or a protein kinase domain of a TOR protein for identifying proteins involved in developmental pathways in a plant associated with TOR Thus a method of identifying a TOR-interacting protein (TIP) involved in developmental pathways in a plant comprises providing a test organism having a phenotypic deficiency arising from non-functioning of a transcription factor, introducing into the organism a protein construct comprising a TOR protein or a protein kinase domain of a TOR protein and a binding domain of the transcription factor, introducing into the organism a protein construct comprising a protein of interest and an activation domain of the transcription factor, and, determining whether the transcription factor functions thereby determining that the protein of interest is a TOR-interacting protein
There is also provided an isolated or purified polypeptide comprising an amino acid sequence having at least 85% sequence identity to the amino acid sequence as set forth in SEQ ID NO 4 SEQ ID NO 6, SEQ ID NO 8 SEQ ID NO 10, SEQ ID NO 12, SEQ ID NO 14, SEQ ID NO 16, SEQ ID NO 18, SEQ ID NO 20, SEQ ID NO 22, SEQ ID NO 24, SEQ ID NO 26 SEQ ID NO 28, SEQ ID NO 30, SEQ ID NO 32, SEQ ID NO 34 SEQ ID NO 36, SEQ ID NO 38, SEQ ID NO 40 SEQ ID NO 42 or SEQ ID NO 79 or a conservatively substituted amino acid sequence thereof
There is also provided an isolated or purified nucleic acid molecule comprising a nucleotide sequence having at least 85% sequence identity to the nucleotide sequence as set forth in SEQ ID NO 3 SEQ ID NO 5, SEQ ID NO 7 SEQ ID NO 9, SEQ ID NO 1 1 ,
SEQ ID NO 13, SEQ ID NO 15 SEQ ID NO 17 SEQ ID NO 19 SEQ ID NO 21 SEQ ID
NO 23 SEQ ID NO 25, SEQ ID NO 27, SEQ ID NO 29, SEQ ID NO 31 , SEQ ID NO 33,
SEQ ID NO 35 SEQ ID NO 37, SEQ ID NO 39 SEQ ID NO 41 or SEQ ID NO 78 or a codon degenerate nucleotide sequence thereof
The present invention further relates to a plant cell plant seed or plant having introduced therein a nucleic acid molecule encoding a target of rapamycin (TOR) protein a protein kinase domain of a TOR protein or a TOR-interacting protein (TIP) expression of the nucleic acid molecule altering growth and development of the cell seed or plant in comparison to a cell seed or plant in which the nucleic acid molecule is not introduced
Particularly preferred plants for modification either through over-expression or silencing include Arabidopsis thaliana, Brassica spp (e g B napus B oleracea, B rapa B carinata B juncea), Borago spp (e g borage), Ricinus spp (e g castor (Ricinus communis)), Tneobroma spp (e g cocoa bean ( Theobroma cacao)), Zea spp (e g corn (Zea mays)), Gossypium spp (e g cotton) Crambe spp , Cuphea spp , Linum spp (e g flax), Lesquerella spp Limnanthes spp , Linola, Tropaeolum spp (e g nasturtium), Oenothera spp , Olea spp (e g olive), Elaeis spp (e g palm) Arachis spp (e g peanut), Carthamus spp (e g safflower), Glycine spp and Soja spp (e g soybean), Helianthus spp (e g sunflower), Nicotiana spp (e g tobacco), Vernonia spp , Triticum spp (e g wheat), Hordeum spp (e g barley) Oryza spp (e g rice) Avena spp (e g oat), Sorghum spp , Secale spp (e g rye), Medicago sativa (alfalfa), Lens culinaris (lentils), and Cicer arietinum (chick pea) Brassica spp are most preferred Further features of the invention will be described or will become apparent in the course of the following detailed description
Brief Description of the Drawings
In order that the invention may be more clearly understood, embodiments thereof will now be described in detail by way of example with reference to the accompanying drawings, in which
Fig 1A depicts a series of insertion/knockout mutants from N to C terminal of TOR that were genotyped and phenotyped
Fig 1 B depicts pictures showing that embryo development is blocked at 16-32 cells in /UTOR mutant lines Embryo phenotype of AfTOR knockout line (1 and 2) and Nomarski optics images of TOR/TOR (3) and tor/tor (4 and 5) are shown Pictures 3, 4 and 5 are shown at the same magnification respectively
Fig 2A depicts distribution of six putative nuclear localization sites (NLS) in /UTOR and generation of a series of /UTOR deletion mutants fused with green fluorescent protein (GFP) and expression in onion epidermal cells show that NLS of AfTOR resides in kinase domain
Fig 2B illustrates that RPRK motif is essential for AfTOR nuclear localization Fig 2C depicts representative images of AtTOR nuclear localization Onion epidermal cells were examined under bright-field (1 ) Transient expression of AfTOR GFP construct in onion epidermal cells show the localization of GFP signal in both nucleus and cytoplasm (2) DAPI nuclear staining (3) DAPkGFP co-localization (4) Fig 3A depicts full-length AtTOR and deletion derivatives of ,AfTOR, and phenotypes of ectopically expressed /UTOR and it's deletion derivatives with reference to πbosomal RNA (rRNA) expression The symbols + ++, +++ and ++++ corresponds to 1 2, 3 and 4 fold increases in rRNA expression, respectively
Fig 3B depicts representative phenotypes of over-expressed AtTOR and its deletion deπvates in transgenic Arabidopsis (1 ) larger and thicker leaves, (2) enlarged stem, (3) altered root architecture
Fig 4A depicts a functional complementation assay in TORM5/torm5 background which shows that NLS6 can partially rescue the torm5/torm5 mutant phenotypes, while deletions without NLS6 fail to rescue embryo lethality Fig 4B depicts representative images of the /AfTOR functional complementation
Fig 5 depicts a model for TOR regulation of πbosome biogenesis in Arabidopsis
Fig 6 depicts yeast culture dishes showing identification of TOR interacting proteins (TIPs) using a yeast two hybridization system
Fig 7 depicts illustrations of embryos grown from cells in which expression of various TOR interacting proteins (TIPs) has been knocked-out
Fig 8A depicts plant cultures comparing nutrient use-efficiency phenotype of wild- type (VVT) Arabidopsis plants to gain of function lines (AtTI P2 AtTIP3 and AtTI P6) produced with some of the TIPs
Fig 8B depicts plant cultures of transgenic Arabidopsis and B napus plants transformed with TIP2 under the control of the CaMV 35S promoter showing efficient growth in low nitrogen and potassium media
Fig 8C depicts plant cultures of transgenic Arabidopsis and B napus plants transformed with TIP6 under the control of the CaMV 35S promoter showing efficient growth in low nitrogen and potassium media Fig 9A depicts wild-type (WT) and transgenic TIP (AtTIPI 3 AtTIP8 AtTIP28 and AtTIPI 6) Arabidopsis plants or seeds comparing leaf flower inflorescence architecture silique and seed characteristics
Fig 9B depicts wild-type (WT) and transgenic TIP (AtTIP5 AtTI P7, AtTIP3 and AtT!P9) Arabidopsis plants comparing leaf flower inflorescence architecture and siiique characteristics
Fig 9C depicts wild-type (WT) and transgenic AtTIP5 Arabidopsis plants showing larger meristem and more flowers
Fig 9D depicts wild-type (WT) and transgenic AtTIP7 Arabidopsis plants showing more branches
Fig 9E depicts wild-type (WT) and transgenic AtTIP8 Arabidopsis plants showing larger sihques
Fig 1OA depicts wild-type (WT) and transgenic BnTIPI 5 Brassica napus plants showing increased branching and increased flower and silique number Fig 1 OB depicts wild-type (WT), transgenic TF1 (TOR interacting Transcription
Factor 1 transgenic TF2 (TOR interacting Transcription Factor 2) and transgenic BnTIP20 Brassica napus showing increased branching of transgenic BnTlP20 plants
Figs 1 1A, 1 1 B and 1 1 C depict wild-type (WT) and transgenic TIP (BnTIPI (TOR), BnTIP15 and BnTIP16) Brassica napus seeds comparing seed color and seed size Fig 12A depicts a flow chart illustrating isolation of TOR from Brassica napus
Fig 12B depicts a map of a BnTOR over-expression construct
Fig 12C depicts a map of a TIPs over-expression construct
Fig 13 depicts that ectopic expression of BnTOR confers better water use-efficiency in Arabidopsis (Fig 13A) and Brassica napus (Fig 13B) transgenic lines in a competitive environment
Fig 14 depicts that ectopic expression of BnTOR confers 10-15 days earlier flowering in a field (Fig 14A) and in a greenhouse (Fig 14B) Fig 15 depicts that ectopic expression of BnTOR confers 15% bigger seeds in Brassica napus transgenic lines
Description of Preferred Embodiments Sequence Identity Two ammo-acid or nucleotide sequences are said to be "identical" if the sequence of ammo-acids or nucleotide residues in the two sequences is the same when aligned for maximum correspondence as described below Sequence comparisons between two (or more) peptides or polynucleotides are typically performed by comparing sequences of two optimally aligned sequences over a segment or "comparison window" to identify and compare local regions of sequence similarity Optimal alignment of sequences for comparison may be conducted by the local homology algorithm of Smith and Waterman (Smith 1981 ), by the homology alignment algorithm of Neddleman and Wunsch (Neddleman 1970), by the search for similarity method of Pearson and Lipman (Pearson 1988), by computerized implementation of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group (GCG), 575 Science Dr Madison Wis ) or by visual inspection Isolated and/or purified sequences of the present invention may have a percentage identity with the bases of a nucleotide sequence, or the amino acids of a polypeptide sequence, of at least about 80%, 81 % 82%, 83%, 84%, 85%, 86% 87%, 88% 89%, 90% 91 %, 92%, 93%, 94%, 95%, 96% 97%, 98%, 99% 99 5%, 99 6%, or 99 7% This percentage is purely statistical, and it is possible to distribute the differences between the two nucleotide sequences at random and over the whole of their length
It will be appreciated that this disclosure embraces the degeneracy of codon usage as would be understood by one of ordinary skill in the art and as illustrated in Table 1 Furthermore it will be understood by one skilled in the art that conservative substitutions may be made in the amino acid sequence of a polypeptide without disrupting the structure or function of the polypeptide Conservative substitutions are accomplished by the skilled artisan by substituting amino acids with similar hydrophobicity polarity and R-chain length for one another Additionally by comparing aligned sequences of homologous proteins from different species conservative substitutions may be identified by locating amino acid residues that have been mutated between species without altering the basic functions of the encoded proteins Table 2 provides an exemplary list of conservative substitutions Table 1 - Codor Degeneracies
Table 2 - Conservative Substitutions
Type of Amino Acid Substitutable Amino Acids
Hydrophilic Ala, Pro, GIy, GIu, Asp, GIn, Asn, Ser, Thr
Sulphydryl L Cys
Aliphatic VaI, lie, Leu, Met
Basic Lys, Arg, His
Aromatic Phe, Tyr, Trp
The definition of sequence identity given above is the definition that would be used by one of skill in the art. The definition by itself does not need the help of any algorithm, said algorithms being helpful only to achieve the optimal alignments of sequences, rather than the calculation of sequence identity. From the definition given above, it follows that there is a well defined and only one value for the sequence identity between two compared sequences which value corresponds to the value obtained for the best or optimal alignment.
In the BLAST N or BLAST P "BLAST 2 sequence", software which is available in the web site http://www.ncbi nlm.nih.gov/gorf/bl2.html, and habitually used by the inventors and in general by the skilled man for comparing and determining the identity between two sequences gap cost which depends on the sequence length to be compared is directly selected by the software (ι e 1 1 2 for substitution matrix BLOSUM-62 for length>85)
Over-expression
DNA isolation and cloning is well established Similarly an isolated gene may be inserted into a vector and transformed into plant cells by conventional techniques Nucleic acid molecules may be transformed into a plant As known in the art there are a number of ways by which genes and gene constructs can be introduced into plants and a combination of transformation and tissue culture techniques have been successfully integrated into effective strategies for creating transgenic plants These methods which can be used in the invention have been described elsewhere (Potrykus 1991 Vasil 1994, Walden 1995 Songstad 1995), and are well known to persons skilled in the art For example, one skilled in the art will certainly be aware that, in addition to Agrobacteπum mediated transformation of Arabidopsis by vacuum infiltration (Bechtold 1993) or wound inoculation (Katavic 1994) it is equally possible to transform other plant species, using Agrobactenum Ti-plasmid mediated transformation (e g hypocotyl (DeBlock 1989) or cotyledonary petiole (Moloney 1989) wound infection) particle bombardment/biolistic methods (Sanford 1987, Nehra 1994, Becker 1994) or polyethylene glycol-assisted, protoplast transformation (Rhodes 1988, Shimamoto 1989) methods
As will also be apparent to persons skilled in the art, and as described elsewhere (Meyer 1995 Datla 1997) it is possible to utilize plant promoters to direct any intended regulation of transgene expression using constitutive promoters (e g , those based on CaMV35S) or by using promoters which can target gene expression to particular cells tissues (e g napin promoter for expression of transgenes in developing seed cotyledons) organs (e g roots) to a particular developmental stage or in response to a particular external stimulus (e g heat shock) Promoters for use herein may be inducible constitutive or tissue-specific or cell specific or have various combinations of such characteristics Useful promoters include but are not limited to constitutive promoters such as carnation etched ring virus (CERV) cauliflower mosaic virus (CaMV) 35S promoter or more particularly the double enhanced cauliflower mosaic virus promoter comprising two CaMV 35S promoters in tandem (referred to as a "Double 35S" promoter) Meristem specific promoters include for example STM BP WUS CLV gene promoters Seed specific promoters include for example the napin promoter Other cell and tissue specific promoters are well known in the art Promoter and termination regulatory regions that will be functional in the host plant cell may oe heterologous (that is not naturally occurring) or homologous (derived from the plant host species) to the plant cell and the gene Suitable promoters which may be used are described above The termination regulatory region may be derived from the 3' region of the gene from which the promoter was obtained or from another gene Suitable termination regions which may be used are well known in the art and include Agrobacterium tumefaciens nopaline synthase terminator (Tnos) A tumefaciens mannopine synthase terminator (Tmas) and the CaMV 35S terminator (T35S) Particularly preferred termination regions for use herein include the pea ribulose b/sphosphate carboxylase small subunit termination region (TrbcS) or the Tnos termination region Such gene constructs may suitably be screened for activity by transformation into a host plant via Agrobacterium and screening for the desired activity using known techniques
Preferably a nucleic acid molecule construct for use herein is comprised within a vector, most suitably an expression vector adapted for expression in an appropriate plant cell It will be appreciated that any vector which is capable of producing a plant comprising the introduced nucleic acid sequence will be sufficient Suitable vectors are well known to those skilled in the art and are described in general technical references (Pouwels 1986) Particularly suitable vectors include the Ti plasmid vectors
Transformation techniques for introducing the DNA constructs into host cells are well known in the art and include such methods as micro-injection, using polyethylene glycol electroporation or high velocity ballistic penetration A preferred method relies on Agrobacterιum-med\aleό transformation After transformation of the plant cells or plant, those plant cells or plants into which the desired nucleic acid molecule has been incorporated may be selected by such methods as antibiotic resistance herbicide resistance tolerance to ammo-acid analogues or using phenotypic markers Various assays may be used to determine whether the plant cell shows an increase in gene expression for example Northern blotting or quantitative reverse transcriptase PCR (RT- PCR) Whole transgenic plants may be regenerated from the transformed cell by conventional methods Various assays may be used to determine whether the plant cell shows an increase in gene expression for example Northern blotting or quantitative reverse transcriptase PCR (qRT-PCR) Whole transgenic plants may be regenerated from the transformed cell by conventional methods Such plants produce seeds containing the genes for the introduced trait and can be grown to produce plants that will produce the selected phenotype Silencing
Silencing may be accomplished in a number of ways generally known in the art for example RNA interference (RNAi) techniques artificial microRNA techniques virus-induced gene silencing (VIGS) techniques antisense techniques sense co-suppression techniques and targeted mutagenesis techniques
RNAi techniques involve stable transformation using RNA interference (RNAi) plasmid constructs (Helhwell 2005) Such plasmids are composed of a fragment of the target gene to be silenced in an inverted repeat structure The inverted repeats are separated by a spacer often an intron The RNAi construct driven by a suitable promoter for example the Cauliflower mosaic virus (CaMV) 35S promoter is integrated into the plant genome and subsequent transcription of the transgene leads to an RNA molecule that folds back on itself to form a double-stranded hairpin RNA This double-stranded RNA structure is recognized by the plant and cut into small RNAs (about 21 nucleotides long) called small interfering RNAs (siRNAs) siRNAs associate with a protein complex (RISC) which goes on to direct degradation of the mRNA for the target gene
Artificial microRNA (amiRNA) techniques exploit the microRNA (miRNA) pathway that functions to silence endogenous genes in plants and other eukaryotes (Schwab 2006 Alvarez 2006) In this method 21 nucleotide long fragments of the gene to be silenced are introduced into a pre-miRNA gene to form a pre-amiRNA construct The pre-miRNA construct is transferred into the plant genome using transformation methods apparent to one skilled in the art After transcription of the pre-amiRNA, processing yields amiRNAs that target genes which share nucleotide identity with the 21 nucleotide amiRNA sequence
In RNAi silencing techniques two factors can influence the choice of length of the fragment The shorter the fragment the less frequently effective silencing will be achieved but very long hairpirs increase the chance of recombination in bacterial host strains The effectiveness of silencing also appears to be gene dependent and could reflect accessibility of target mRNA or the relative abundances of the target mRNA and the hpRNA in cells in which the gene is active A fragment length of between 100 and 800 bp preferably between 300 and 600 bp is generally suitable to maximize the efficiency of silencing obtained The other consideration is the part of the gene to be targeted 5' UTR coding region and 3' UTR fragments can be used with equally good results As the mechanism of silencing depends on sequence homology there is potential for cross-silencing of related mRNA sequences Where this is not desirable a region with low sequence similarity to other sequences such as a 5 or 3' UTR should be chosen The rule for avoiding cross-homology silencing appears to be to use sequences that do not have blocks of sequence identity of over 20 bases between the construct and the non-target gene sequences Many of these same principles apply to selection of target regions for designing amiRNAs
Virus-induced gene silencing (VIGS) techniques are a variation of RNAi techniques that exploits the endogenous antiviral defenses of plants Infection of plants with recombinant VIGS viruses containing fragments of host DNA leads to post-transcriptional gene silencing for the target gene In one embodiment, a tobacco rattle virus (TRV) based
VIGS system can be used
Antisense techniques involve introducing into a plant an antisense oligonucleotide that will bind to the messenger RNA (mRNA) produced by the gene of interest The
"antisense" oligonucleotide has a base sequence complementary to the gene's messenger
RNA (mRNA) which is called the "sense" sequence Activity of the sense segment of the mRNA is blocked by the anti-sense mRNA segment, thereby effectively inactivating gene expression Application of antisense to gene silencing in plants is described in more detail by Stam 2000
Sense co-suppression techniques involve introducing a highly expressed sense transgene into a plant resulting in reduced expression of both the transgene and the endogenous gene (Depicker 1997) The effect depends on sequence identity between transgene and endogenous gene Targeted mutagenesis techniques, for example TILLING (Targeting Induced Local
Lesions IN Genomes) and "delete-a-gene' using fast-neutron bombardment, may be used to knockout gene function in a plant (Henikoff 2004, Li 2001 ) TILLING involves treating seeds or individual cells with a mutagen to cause point mutations that are then discovered in genes of interest using a sensitive method for single-nucleotide mutation detection Detection of desired mutations (e g mutations resulting in the inactivation of the gene product of interest) may be accomplished for example by PCR methods For example, oligonucleotide primers derived from the gene of interest may be prepared and PCR may be used to amplify regions of the gene of interest from plants in the mutagenized population Amplified mutant genes may be annealed to wild-type genes to find mismatches between the mutant genes and wild-type genes Detected differences may be traced back to the plants which had the mutant gene thereby revealing which mutagenized plants will have the desired expression (e g silencing of the gene of interest) These plants may then be selectively bred to produce a population having the desired expression TILLING can provide an allelic series that includes missense and knockout mutations which exhibit reduced expression of the targeted gene TILLING is touted as a possible approach to gene knockout that does not involve introduction of transgenes and therefore may be more acceptable to consumers Fast-neutron bombardment induces mutations, i e deletions in plant genomes that can also be detected using PCR in a manner similar to TILLING Silencing of the nucleic acid molecule encoding a target of rapamycin (TOR) protein or a protein kinase domain of a TOR protein in a plant results in an embryo defective phenotype increasing the likelihood of embryo fatality or severe developmental deficiencies in the plant In view of the fundamental importance of TOR gene expression constitutive expression of a TOR gene silencing construct is less desirable than selective cell and tissue specific expression of TOR silencing sequences Thus, silencing of TOR, a protein kinase domain of TOR or a TIP in a selective cell or tissue specific manner can lead to a variety of useful phenotypes arising from such genetic ablation, for example, male sterility or female sterility Cell or tissue specific promoters, for example napin seed specific promoter or meristem specific promoters of STM BP, WUS CLV genes can aid in targeting silencing to specific cells or tissues Other cell and tissue specific promoters are well known in the art
Screening for TOR-interacting Proteins (TIPs)
Screening for TOR-interacting proteins (TIPs) using the TOR protein or the kinase domain of the TOR protein can be accomplished by any suitable method For example, two-hybrid screening is one technique used to identify protein-protein interactions [Young 1998] The two-hybrid screen utilizes the fact that, in most eukaryotic transcription factors, the activating and binding domains are modular and can function in close proximity to each other without direct binding Thus even though the transcription factor is split into two fragments it can still activate transcription when the two fragments are indirectly connected
In the yeast two-hybrid assay system (one variation of the two-hybrid screen), a yeast strain deficient in a transcription factor and therefore deficient in the biosynthesis of certain nutrients is utilized This yeast strain can be transformed simultaneously with two separate plasmids a first plasmid engineered to produce a protein product in which the DNA-binding domain (BD) fragment of the deficient transcription factor is fused onto the TOR protein of kinase domain of the TOR protein while a second plasmid is engineered to produce a protein product in which the activation domain (AD) fragment of the deficient transcription factor is fused onto a putative TIPs If the TOR and putative TIPs proteins interact (ι e bind) then the AD and BD of the transcription factor are indirectly connected, bringing the AD in proximity to the transcription start site and transcription of a reporter gene can occur If the TOR and putative TIPs proteins do not interact, there is no transcription of the reporter gene In this way a successful interaction between the fused protein is linked to a change in the cell phenotype
Example 1 Plant Growth Methods
Arabidopsis plants were grown in growth chamber with temperature set at 22 0 C with 16 h light / 8 h dark cycle The Arabidopsis ecotype Columbia (CoI) was used in all transformation and comparative analysis All the Arabidopsis growth and screening of primary transformants were performed according to the methods described in Zhang et al (Zhang 2006) Brassica napus plants were grown in growth chamber using 16 h photopeπod with 2O 0 C day / 15 0 C night cycle settings The Brassica napus DH 12075 line was used in the transformation and comparative analysis
Example 2 AtTOR
Isolation of DNA 1 Purification of Total RNA and cDNA synthesis
Genomic DNA and Total RNA was isolated from 1 -week-old Arabidopsis thaliana seedlings (ecotype Columbia) using DNeasy Plant Mini Kιt(Cat No 69104) and RNeasy Plant Mini Kit (QIAGEN Cat No 74904) following the manufacturer s instructions A
SMART RACE cDNA amplification kit (Clontech, cat No 634914) was used for cDNA amplification following the manufacturer's instructions
The full-length cDNAs of the wild type TOR and various truncated fragments thereof were amplified by RT-PCR using the Advantage® 2 Polymerase Mix kit (Clontech, Cat No 639201 ) following the manufacturer s instructions Three overlapping fragments were amplified and fused together by using the restriction enzymes (BspEI and BIpI) to generate the full-length clone The sequences were verified by DNA sequencing
/AfTOR is a single copy gene in Arabidopsis that encodes a 279 KD protein with Ser/Thr kinase activity Full length (7446 bp) cDNA clones of corresponding AfTOR and its homolog in B napus were isolated The predicted TOR protein (2481 aa SEQ ID NO 2) contains conserved HEAT repeats, FAT FRB kinase and FATC domains
Generation of p β GWG (attL 1/Asιsl/TOR GUS/Ascl /attL2) and GUS histochemical analysis
1 8kb β-glucuronidase (GUS) marker gene was PCR amplified using forward primer GUSF and reverse primer GUSR (see Table 3) inserted into pCR8/GW/TOPO using the TA cloning kit (Invitrogen Cat K2500-20) Table 3 - Primers
Sequencing was done to verify in-frame between attl_1 and GUS ORF A 2 7Kb region upstream of the TOR trarslational start site was amplified using forward primer PTORF and reverse prmer PTORR (see Table 3) PCR products were cloned into TA cloning vector pCR2 1 -TOPO (Invitrogen Cat K2000-01 ) for sequencing After digestion by Asis I and Not I it was subcloned into the Asis I/Not I cassettes upstream of the GUS coding region to generate p8GWG(T0R GUS) TOR GUS was transferred into pEarleyGate303 through LR recombination reactions GUS assays were as described (BIa zquez 1997)
Generation of pβGWC (attL 1/Asιs!/T0R TORKD vGFP/Ascl/attL2) and constructions for protein localization Based on p8GWN, pδGWC (TOR TORKD vGFP) vector was created using the forward primer and reverse primer 813 bp vGFP was PCR amplified by forward primer and reverse primer As above 2 7kb TOR promoter and 813bp vGFP were fused upstream and downstream of TORKD TOR TORKD vGFP was transferred into pEarleyGate303 through LR recombination reactions The resulting plasmids were transformed into different TOR knockout lines Arabidopsis plants (CoI) by the floral dipping method (Clough 1998)
Isolation of T-DNA Insertion Lines
To identify TOR insertional the following salk lines were ordered from ABRC SAILJ 149_B04, SALK_043130 SALKJ 38622 SALK_013925 SALK_016286, SALK_028697, SALK_017177, SALKJ47473 SALK_007654 SALK_036379 The knockout lines were identified by PCR with primers designed from T-DNA Primer Design website http //signal salk edu/tdnapπmers 2 html
Referring to Figs 1A and 1 B insertion/knockout mutants (tor-1 , tor-2, tor-3, tor-4, tor-5) from N to C terminal of TOR are depicted In tor-1 HEAT repeats FAT, FRB, kinase and FATC domains are knocked-out and the line was embryo defective with decreased rRNA expression In mutants tor-2 and tor-3 part or all of the HEAT repeats were not knocked out while FAT FRB kinase and FATC were knocked-out resulting in a line that was also embryo defective with decreased rRNA expression In tor-4 the FAT and FRB domains as well as the HEAT repeats remained with the kinase and FATC domains knocked-out also resulting in a line that was embryo defective with decreased rRNA expression However in tor-5 the kinase domain as well as the HEAT repeats, FAT and FRB domains were not knocked-out with only the FATC domain knocked-out resulting in a line that was not embryo defective and did not have decreased rRNA expression pr detectable embryo or post-embryo phentoypes Thus it appears that TOR kinase domain is essential for embryo development and rRNA synthesis in Arabidopsis The kinase domain in AtTOR is a 300 amino acid sequence from amino acid 2050 to 2350 of SEQ ID NO 2
TOR kinase and NLS mutant and Truncation Plasmid Constructions
The TOR1 kinase and NLS mutation was introduced by PCR overlap mutagenesis using primers and the cDNA clone The PCR product was cloned into PCR2 1 TOPO using the TA cloning Kit and the recommandent plasmids had been cleaved with Notl and Xmal and subcloned into plasmid p8WGC All other internal deletions were generated by PCR overlap mutagenesis using the TaKaRa long-range PCR system from lntergen Deletion 1962-2051 was generated with overlapping primers Referring to Figs 2A 2B and 2C domains required for nuclear localization of AtTOR were characterized Six putative nuclear localization sites (NLS1-NLS6) were identified and six deletion mutants (TOR2050-2350 TOR2031-2482, TOR1832-2482 TOR1433-2482 TOR652-2482 and TOR1-2050, where the numbers refer to the amino acids remaining in the deletion mutant) were compared to the full-length TOR (TOR) to identify which of the six putative putative nuclear localization sites (NLS) is the correct one Fig 2A demonstrates that NLS6 located in the kinase domain is the NLS To more exactly determine the amino acid sequence responsible for nuclear localization three deletion mutants within the kinase domain surrounding NLS6 were made (Fig 2A) and it appears that RPRK motif (aa 2077- 2080 of SEQ ID NO 2; is essential for AtTOR nuclear localization in BnTOR, the kinase domain is located at aa 2049-2349 of SEQ ID NO 4 and the RPRK motif at aa 2076-2079 of SEQ ID NO 4
Referring to Figs 3A and 3B AfTOR (TOR) and eleven deletion derivatives of AtTOR (TOR2050-2350 TOR2031-2482, TOR1832-2482, TOR1433-2482, TOR652-2482 TOR1 -1399/1801 -2482) TOR1-2050 TOR1-1900 TOR1-1400, TOR1400-1800 and TOR1900-2050 where the numbers refer to the amino acids remaining in the deletion derivative) were over-expressed in A thaliana under the control of the CaMV 35S promoter (The deletion derivative TOR1-1399/1801-2482 has amino acids 1400-1800 deleted ) Over- expression of the full-length /AfTOR and the eleven deletion derivatives corresponding to different functional domains of AfTOR in transgenic plants showed up-regulation of nbosomal RNA expression and a range of developmental phenotypes It is evident from Fig 3A that in most cases the kinase domain is important for up-regulation of rRNA expression in transgenic plants All deletion derivatives retaining the kinase domain show up-regulated rRNA expression while only one of the five deletion derivatives not having the kinase domain show up-regulation and that one (TOR1 -2050) is only a effective at up- regulating rRNA expression as the least of the deletion derivatives that retains the kirase domain Fig 3B shows that transgenic plants over-expressing AtTOR have larger and thicker leaves, enlarged stems and altered root architecture compared to wild-type (WT) plants grown under the same conditions Referring to Figs 4A and 4B functional complementation assays in TORM5/torm5 background demonstrate that nuclear localization of AtTOR is important for embryo/seed development in Arabidopsis Full-length AfTOR (TOR) and four deletion derivatives (TOR2031 -2482 TOR1832-2482 TOR1433-2482 and TOR1-1399/1801 -2482 where the numbers refer to the amino acids remaining in the deletion derivative) retaining the NLS6 site were shown to at least partially rescue the torm5/torm5 mutant phenotypes However, three deletion derivatives (TOR1 -2050 TOR1 -2049/2351 -2482 and TOR1 -2076/2081 -2482 where the numbers refer to the amino acids remaining in the deletion derivative) not containing NLS6 failed to rescue embryo lethality (The deletion derivative TOR1- 1399/1801-2482 has amino acids 1400-1800 deleted, TOR1 -2049/2351 -2482 has amino acids 2050-2350 deleted and TOR1 -2076/2081 -2482 has amino acids 2077-2080 deleted )
Referring to Fig 5 a proposed model for TOR regulation of πbosome biogenesis in
Arabidopsis is illustrated Over-expression of AtTOR leads to a pronounced increase of πbosome RNA expression, while loss function of AtTOR causes severe repression of πbosome RNA synthesis Arabidopsis Columbia ecotype was used in all the transformation studies
Example 3 Identification of TOR-interacting Proteins (TIPs)
Referring to Fig 6 a yeast two hybridization system was used to identify thirty TOR interacting proteins (TIP1 to TIP30) in Arabidopsis from screening of more than 100 putative candidates in the TOR signaling network in Arabidopsis Proteins that show interaction with AtTOR in the yeast two hybrid assay are designated as TOR-lnteracting Proteins (TIPs) It was found that TOR itself is a TIP, thus the label TIP1 is synonymous with TOR in this description Throughout the Figures reference to a TIP is made in the context of the plant species from which the TIP is derived Thus when the context is A thaliana, TIP1 (TOR) is AtTIPI (AtTOR) TIP2 is AtTIP2 etc and in the context of B napus TIP1 (TOR) is BnTIPI (Bn(TOR) TIP2 is BNTIP2, etc
In the yeast two hybrid method cDNAs of TOR and its truncations as well as AtTIP2 AtTIP5 AtTIP6 AtTIP7 AtTIP8 AtTIP9 AtTIPI 3, AtTIP 15 AtTIPI 6 and AtTIP28 were generated by RT-PCR cloned into pδGWN NotbXmal cassettes box transferred into pDEST™32 (Ampicillin resistance) and pDEST *vl 22 (Gentamicin resistance) by LR recombination reactions respectively and transformed into the yeast host strains MaV203 for interaction assays All the Y2H procedures were performed according to the manufacture s instruction (Invitrogeπ cat no PQ10001 -01 ) As above based on the pCR8/GW/TOPO backbone the Entry vector pδGWG with Asis l-promoter-Not l-GUS-Asc I and pδGWC with Asis l-promoter-Not I-CDS-Xma l+vGFP+Asc I cassettes was created PCR strategy In this system the Pearleygate gateway-compatible vectors were used for destination vectors and the pCR8/GW/TOPO (Invitrogen, Cat K2500-20) was used as the backbone plasmid of entry clones As above the Pearleygate gateway-compatible vectors were used for destination vectors and the pCR8/GW/TOPO (Invitrogen Cat K2500-20) was used as the backbone plasmid of entry clones To recombine the sequences of interest into the pCR8/GW/TOPO vector inserts were generated by PCR
Example 4 Silencing of TOR-interacting Proteins (TIPs)
Referring to Fig 7 knockout of several TIPs (TiPI 1 TOR), TIP2, TIP3, TIP5 TIP7, TIP8, TIP10, TIP1 1 ) implicated in TOR pathway leads to Arabidopsis lines having embryo defective phenotypes Wild-type (WT) and full-length ACTOR over-expression lines are shown as controls Analysis of the TIP knockout lines revealed developmental blocks leading to embryo lethality phenocopying AtTor mutants suggesting likely conserved functions as a complex in similar pathways It is evident that TIPs are required for normal embryo/seed development in Arabidopsis
Example 5 Over-expression of TOR-interacting Proteins (TIPs) Isolation of DNA Purification of Total RNA and cDNA synthesis
Genomic DNA and Total RNA was isolated from 2-week-old Arabidopsis thaliana seedlings (ecotype Columbia) using DNeasy Plant Mini Kιt(Cat No 69104) and RNeasy Plant Mini Kit (QIAGEN Cat No 74904) following the manufacturer's instructions A
SMART RACE cDNA amplification kit (Clontech cat No 634914) was used for cDNA amplification following the manufacturer s instructions
The full-length cDNAs of AtTIP2, AtTIP5 AtTIP6 AtTIP7 AtTIPδ, AtTIP9, AtTIP13, AtTIPI 5 AtTIPI 6, AtTIP28 and corresponding S napus TIPs were amplified by RT-PCR using the Advantage© 2 Polymerase Mix kit (Clontech Cat No 639201 ) following the manufacturer s instructions Three overlapping fragments were amplified and fused together by using the restriction enzymes (BspEI and BIpI) to generate the full-length clone The sequences were verified by DNA sequencing Construction of the p8GWN(attL1/Notb r TORKD/Ascl/attL2) Entry vector and over-expression constructions
A gateway system for creating various expression plasmids using the LR recombination reaction (Invitrogen) was used The construction of the Entry vector p8GWN is based on the pCR8/GW/TOPO (Invitrogen, Cat K2500-20) plasmid, comprising a TOPO AT cloning site flanked by attl_1 and attL2 sites This was used as the backbone plasmid in LR recombination reactions containing the bacterial selection marker (spectionomycin resistance) which differs from the destination vectors pEarleyGate vectors comprising (kanamycin resistance), pDEST15 comprising (Ampicillin resistance), pDEST τy 32 comprising (Ampicillin resistance) and pDEST™22 comprising (Gentamicin resistance) To create p8GWN, inserts were amplified by PCR using forward primers adding a Not I site at the 5' end and reverse primers with Xmal I site at the 5' end Cloned PCR products were directly inserted into pCR8/GW/TOPO and sequenced to make sure the in-frame between attL1 sequence and ORF of target gene After confirming the sequence, wild type AtTIP2, AtTIP5, AtTIPΘ, AtTIP7, AtTIP8,
AtTIP9 AtTIPI 3, AtTIPI 5, AtTIPI 6 and AtTIP28 sequences were cloned as PCR products into p8GWN to generate the gateway system Entry vector Respective plant expression constructs were generated by transferring to pEarleyGate 203 vectors through LR recombination reactions A map of the construct is depicted in Fig 12C using TIP2 as an example The resulting plasmid was used to transform wild-type Arabidoosis plants (CoI) by the floral dipping method (Clough 1998) and Brassica napus by the Moloney cotyledonary petiole method (Moloney 1989)
Nutrient Utilization
Referring to Fig 8A, it is apparent that Arabidopsis plants transformed with TIP2, TIP3 or TIP6 under the control of the CaMV 35S promoter exhibit increased nutrient utilization as the transgenic plantlets are bigger and healthier than the wild-type (CoI WT) plantlets grown under the same conditions The in vitro assay for nutrient use was performed under nitrogen limiting conditions (1/10 th of normal levels)
TIP2 encodes a putative protein kinase which is a member of the AGC protein kinase family Referring to Fig 8B transgenic plants with over-expression of TIP2 under the control of CaMV 35S promoter in Arabidopsis and Brassica napus show better nitrogen and potassium use efficiency Compared with control plants, they displayed normal growth and development under limiting conditions with 1/30 h nitrogen and potassium levels in the medium Results from this study showed that normal root growth is maintained in transgenic Arabidopsis and B napus plants despite significantly lower levels of these nutrients
TIP6 encodes a putative 3-phosphoιnosιtιde-dependent protein kinase and contains pleckstrin domain Referring to Fig 8C transgenic plants with over-expression of TIP6 under the control of the CaMV 35 promoter in Arabidopsis and Brassica napus show better nitrogen and potassium use efficiency Compared with control plants, they displayed normal growth and development in 1/30' h nitrogen and potassium in in vitro assays
Plant Morphology Referring to Fig 9A and 9B a comparison of plant and seed characteristics between wild-type (CoI WT) and transgenic TIP (TIP3 TIP5, TIP7, TIP8 TIP13, TIP16 and TIP28) Arabidopsis plants or seeds shows that ectopic expression of TIPs alters developmental programs involving meπstem, leaf, flower, inflorescence, architecture, silique and seed Phenotypes produced by the over-expression of TIPs include increased seed number, flower number and branches Earlier flowering times for TIPs plants of up to 14 days in greenhouses and up to 10 days in the field were noted, i e TIPs plant flowered up to 14 days sooner in greenhouses and up to 10 days sooner in the field than wild-type plants
TIP5 encodes a putative eukaryotic translation initiation factor 2 subunit 1 (elF-2A) and has translation initiation factor activity Referring to Fig 9C, ectopic expression TIP5 under the control of the CaMV35S promoter in Arabidopsis transgenic lines produced larger meπstem and more flowers
TIP7 encodes a putative signal transducin protein This protein contains 7 WD-40 repeats Referring to Fig 9D over-expression constructs of TIP7 under the control of the CaMV35S promoter in transgenic Arabidopsis lines produced more branches
TIP8 encodes a putative 14-3-3 anchor protein Referring to Fig 9E over-expression of TIP8 under the control of the CaMV35S promoter in Arabidopsis produced larger siliques
TIP9 encodes a putative phosphatase 2A associated protein Referring to Fig 9B over-expression of TIP9 under the control of the CaMV35S promoter in Arabidopsis produced plants with more branches
T1P13 encodes a putative transducin protein This protein contains 7 WD-40 repeats
Referring to Fig 9A over-expression constructs of TIP13 gene under the control of the CaMV35S promoter in Arabidopsis produced plants with multiple siliques in one flower TIP15 encodes a putative transducin family protein This protein contains WD-40 repeats Referring to Fig 1OA, over-expression of BnTIPI 5 under the control of the CaMV35S promoter in transgenic B napus plants showed more branches flowers and siiiques compared to non-transformed control plants Referring to Fig 1 OB the effect of over-expression of BnTIP20 under the control of the CaMV35S promoter on crop performance and yield was demonstrated in Brassica napus Comparison was made to wild-type (DH12075 line -WT) and transgenic (TF1 and TF2) B napus lines It is evident that transgenic BnTIP20 plants have increased branching in comparison to wild-type plants TIP16 encodes a putative serine decarboxylase In Arabidopsis, AtTIPI 6 under the control of the CaMV35S promoter produced plants showing expanded gynoecium and siiiques compared to wild type In Brassica napus, transgenic BnTIPI 6 plants showed early flowering compared to wild type
TIP28 shows homology to translation Initiation Factor 2 beta subunit (EIF-2 Beta) In Arabidopsis, over-expression of AtTlP28 under the control of the CaMV 35S promoter produced plants with early flowering compared to wild type In transgenic Brassica napus, over-expression of BnTIP28 under the control of the CaMV 35S promoter also produced plants with early flowering
Seed Morphology Referring to Fig 1 1A and 1 1 B the color and size of seed from wild-type (WT) S napus was compared to the color and size of seeds from transgenic BnTIP B napus lines In BnTIPI 6 lines, BnTIPI 6 is over-expressed under the control of the CaMV 35S promoter and in T1P1 (TOR) lines, BnTIPI (TOR) is over-expressed under the control of the CaMV35S promoter BnTIPI 6 encodes a putative serine decarboxylase Seeds from BnTIP16 transgenic plants are lighter in color than seeds from the wild-type line indicating a reduction in proanthocyanidins (PA) in the seeds of the BnTIP16 line Seeds from BnTIPI (TOR) transgenic plants are larger in size than seeds from the wild-type line
TIP15 encodes a putative transducin family protein This protein contains WD-40 repeats Referring to Fig 1 1 C over-expression constructs of BnTIPI 5 under the control of the CaMV35S promoter in transgenic B napus produced plants having about 15% more seeds per plant TIP8 encodes a putative 14-3-3 anchor protein Referring to Fig 9A and Fig 9E, over-expression of TIP8 in Arabidopsis under the control of the CaMV35S promoter produced plants having increased seed size
TIP28 shows homology to translation Initiation Factor 2 beta subunit (EIF-2 Beta) Referring to Fig 9 in Arabidopsis the over-expression of TIP28 under the control of CaMV 35S promoter produced more seeds in sihques
O;/ Content
TIP16 encodes a putative serine decarboxylase TIP28 shows homology to translation Initiation Factor 2 beta subunit (EIF-2 Beta) In Arabidopsis the over-expression of TIP16 or TIP28 under the control of CaMV 35S promoter increased oil content
Example 6 Expression of BnTOR
Referring to Fig 12A, full length BnTOR was isolated from B napus as follows Partial cDNA clones corresponding to putative B napus TOR gene was identified from embryo EST collection Using this sequence information, RACE™ (rapid amplification of cDNA ends) kit (Invitrogen, Cat No L1502-01 ) was employed for identification of BnTOR 5 and two overlapping RT-PCR reactions and sequencing of the products The BnTOR generated from PCR amplification of two overlapping fragments that contains Not I restriction site at the 5 end and Asc I restriction site at the 3' end The sequence of this clone was further confirmed by DNA sequencing BnTOR shows 92% identity at the nucleotide level, and 93% identity at the amino acid level with AtTOR, respectively The BnTOR was digested with Not I and Asc I restriction enzymes and cloned into Per380 plasmid vector to generate the gateway Entry vector system as further described below The plant expression construct was generated by transferring BnTOR to destination vector Per370 to produce expression cassette that include double CaMV35S promoter to drive the expression of BnTOR transgene through LR recombination reactions The details of BnTOR isolation and construction of recombinant expression cassette was described in the Fig 12A BnTOR is a 7443 bp DNA molecule (SEQ ID NO 2) encoding a 2480 aa polypeptide (SEQ ID NO 4)
Plant expression constructs were generated using the full length and different deletion derivatives of TOR to Per370 vector through LR recombination reactions The resulting plasmids were used to transform wild-type Arabidopsis plants (CoI) by the floral dipping method (Clough 1998) and Brassica napus by a method using cotyledonary petioles
(Moloney 1989) Referring to Fig 13 Arabidopsis lines with ectopic TOR over-expression showed better water utilization when compared to wild type plants The transformed lines withstood lack of watering for a period of three weeks, while in comparison the control wild type plants (without the TOR transgene) did not survive and showed wilting (Fig 13A) Similar results were obtained with transgenic B napus which exhibited resistance to no water for 10 days longer than wild type (Fig 13B) In transgenic Arabidopsis and B napus transgenic lines normal growth was restored after watering, whereas the wild type plants did not recover The results demonstrate that TOR over-expression or targeted expression in transgenic lines provides protection from limited water supply or drought Referring to Fig 14 transgenic S napus lines with TOR over-expression displayed early flowering by 10-15 days in comparison to the wild type The overall yield of these plants is not compromised and similar to the wild type Homozygous B napus lines that displayed this phenotype in greenhouse conditions (Fig 14B) were tested in field conditions (Fig 14A) and early flowering was observed The results in the field (tested in 2008 and 2009) are consistent with the greenhouse Thus, the growing period for B napus or other crop or economically important crop species can be significantly reduced without compromising the yield
Referring to Fig 15 transgenic B napus lines with TOR over-expression produced larger and heavier seeds Seeds from wild type plants had an average seed weight of 0 3745 g per 100 seeds, seeds from SnTORI line had an average seed weight of 0 4343 g per 100 seeds and seeds from SnTOR2 line had an average seed weight of 0 4296 g per 100 seeds All measurements were made with 15 repeats Thus seeds from the transgenic lines are consistently about 15% larger and heavier than the control wild type seeds These findings were further tested in field conditions (2008 and 2009) and similar results were obtained Thus, it is possible to manipulate seed size and weight by expressing over-expressing or silencing TOR in a plant
Conclusion
The TOR gene signaling pathway is fundamental to the control of growth and development in plants and the transduction of many environmental parameters that modulate plant growth and development Experimental tools that include biochemical, molecular developmental genomic and loss and gain of function transgenic approaches have been applied to modulate the TOR signaling pathway in plants using Arabidopsis model systems and Brassica napus crop species A total of 30 proteins that interact with TOR (TIPs) have been identified and their functions are implicated in diverse developmental and biochemical processes have been investigated Functional studies with selected gene targets have shown a range of commercially valuable phenotypes that include reduced flowering time, improved nutrition-use-efficiency improved water-use-efficiency, improved yield and enhanced stress tolerance in transgenic Arabidopsis and Brassica lines Listing of TOR and TIPs Sequences
SEQ ID NO 1 - AtTOR (AtTIPI ) nucleic acid molecule 7446 bp, Arabidopsis thaliana SEQ ID NO 2 - AtTOR (AtTIPI ) protein, 2481 aa, Arabidopsis thaliana SEQ ID NO 3 - BnTOR (BnTIPI ), nucleic acid molecule, 7443 bp. Brassica napus SEQ ID NO 4 - BnTOR (BnTIPI ), protein, 2480 aa, Brassica napus SEQ ID NO 5 - AtTIP2, nucleic acid molecule, 1416 bp Arabidopsis thaliana SEQ ID NO 6 - AtTIP2, protein, 471 aa, Arabidopsis thaliana SEQ ID NO 7 - BnTIP2, nucleic acid molecule, 1389 bp, Brassica napus SEQ ID NO 8 - BnTIP2 protein, 462 aa, Brassica napus SEQ ID NO 9 - AtTIP3, nucleic acid molecule, 873 bp, Arabidopsis thaliana SEQ ID NO 10 - AtTIP3, protein, 290 aa Arabidopsis thaliana
SEQ ID NO 11 - BnTIP3, nucleic acid molecule, 873 bp, Brassica napus SEQ ID NO 12 - BnTIP3 protein, 290 aa Brassica napus SEQ ID NO 13 - AtTIP5 nucleic acid molecule, 1035 bp Arabidopsis thaliana SEQ ID NO 14 - AtTI P5, protein, 344 aa, Arabidopsis thaliana SEQ ID NO 15 - BnTIP5 nucleic acid molecule 1035 bp Brassica napus SEQ ID NO 16 - BnTIP5, protein 344 aa Brassica napus SEQ ID NO 17 - AtTIPΘ nucleic acid molecule 1476 bp Arabidopsis thaliana SEQ ID NO 18 - AtTIPΘ protein 491 aa Arabidopsis thaliana
SEQ ID NO 19 - BnTIP6 nucleic acid molecule 1471 bp Brassica napus SEQ ID NO 20 - BnT!P6 protein 490 aa Brassica napus
SEQ ID NO 21 - AtTIP7 nucleic acid molecule 954 bp Arabidopsis thaliana
SEQ ID NO 22-AtTlP7 protein 317 aa Arabidopsis thaliana
SEQ ID NO 23 - AtTIPδ nucleic acid molecule 768 bp Arabidopsis thaliana SEQ ID NO 24-AtTIP8 protein 255 aa Arabidopsis thaliana
SEQ ID NO 25 - BnTIP8 nucleic acid molecule 774 bp Brassica napus SEQ ID NO 26 - BnTIPδ protein 257 aa Brassica napus SEQ ID NO 27-AtTlP9 nucleic acid molecule 1218 bp Arabidopsis thaliana SEQ ID NO 28-AtTIP9 protein 405 aa Arabidopsis thaliana SEQ ID NO 29-BnTIP9 nucleic acid molecule 1218 bp Brassica napus SEQ ID NO 30-BnTIP9 protein 405 aa Brassica napus SEQ ID NO 31 -AtTIPI 3 nucleic acid molecule 4035 bp Arabidopsis thaliana SEQ ID NO 32 -AtTIPI 3 protein 1344 aa Arabidopsis thaliana SEQ ID NO 33 -AtTIPI 5 nucleic acid molecule 2262 bp Arabidopsis thaliana SEQ ID NO 34 -AtTIPI 5 protein 753 aa Arabidopsis thaliana
SEQ ID NO 35 -BnTIPI 5 nucleic acid molecule 2205 bp Brassica napus SEQID NO 36 -BnTIPI 5 protein 734 aa Brassica napus SEQ ID NO 37-AtTIP16 nucleic acid molecule 1449 bp Arabidopsis thaliana SEQ ID NO 38-AtTIP16 protein 482 aa Arabidopsis thaliana SEQ ID NO 39 - AtTIP28 nucleic acid molecule 807 bp Arabidopsis thaliana SEQ ID NO 40 - AtTIP28 protein 268 aa Arabidopsis thaliana SEQ ID NO 41 -BnTIP28 nucleic acid molecule 819 bp Brassica napus
SEQ ID NO 42 - BnTIP28 protein 272 aa Brassica napus SEQ ID MO: 78 - BnTIPI 6, nucleic acid molecule. 1473 bp, Brassica napus SEQ ID NO: 79 - BnTIPI 6, protein, 490 aa. Brassica napus
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Other advantages that are inherent to the structure are obvious to one skilled in the art The embodiments are described herein illustratively and are not meant to limit the scope of the invention as claimed Variations of the foregoing embodiments will be evident to a person of ordinary skill and are intended by the inventor to be encompassed by the following claims
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