EP1250352A1 - Rezeptorähnliche proteinkinasen aus nicotiana tabacum - Google Patents
Rezeptorähnliche proteinkinasen aus nicotiana tabacumInfo
- Publication number
- EP1250352A1 EP1250352A1 EP00983273A EP00983273A EP1250352A1 EP 1250352 A1 EP1250352 A1 EP 1250352A1 EP 00983273 A EP00983273 A EP 00983273A EP 00983273 A EP00983273 A EP 00983273A EP 1250352 A1 EP1250352 A1 EP 1250352A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polypeptide
- sequences
- nucleic acid
- plant
- receptor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1205—Phosphotransferases with an alcohol group as acceptor (2.7.1), e.g. protein kinases
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8291—Hormone-influenced development
- C12N15/8293—Abscisic acid [ABA]
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8291—Hormone-influenced development
- C12N15/8294—Auxins
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8291—Hormone-influenced development
- C12N15/8295—Cytokinins
Definitions
- the invention relates to nucleic acids which code for plant polypeptides with the biological activity of receptor-like protein kinases, and the corresponding polypeptides per se
- Receptor-like kinases usually span the cell membrane and thus have an extracytoplasmic and a cytoplasmic part. They act in organisms as mediators of signals that are passed on from the outside into the cell interior (e.g. van der Geer at al, 1994) by binding a ligand the extracellular domain is activated and the cytoplasmic protein kinase domains are activated. This is done by autophosphoryeration of either the Senn and / or Threonm residues, the tyrosine or histidine residues (e.g. Fantl et al, 1993). Animal receptor kinases autophosphoryheres mainly tyrosine residues, in contrast, seem almost exclusively in plants Se ⁇ n- / Threomn-K ⁇ nasen occur (Becraft, 1998)
- Se ⁇ n- / Threon ⁇ n-K ⁇ nases catalyze the reversible transfer of the ⁇ -phosphate residue from ATP to amino acids of a recipient protein.
- the presence of 1 1 conserved domains essentially determines the enzymatic function of protemkinases (Hanks et al, 1988). These domains contain a total of 9 Amino acids that are invariable in all previously identified protein kinases. They are involved in ATP binding and presumably in the recognition of the amino acid to be phosphorylated, such as Senn Threonm or tyrosine
- the subject of the present invention is nucleic acids which encode plant poh peptides with the biological activity of a protemkinhe protemkinase which encompasses the amino acid sequence according to SEQ I D ⁇ 0 2.
- Threonm kinases are in particular single-stranded or double-stranded deoxyribonucleic acids (DNA) or ribonucleic acids (RNA). Preferred embodiments are fragments of genomic DNA, which may contain introns, and cDNAs.
- the nucleic acids according to the invention are preferably DNA fragments which correspond to genomic DNA from tobacco plants.
- nucleic acids according to the invention particularly preferably comprise a sequence selected from
- sequences which have at least 60%, preferably at least 80%, particularly preferably at least 90% identity with the sequences defined under a) or b),
- a very particularly preferred embodiment of the nucleic acids according to the invention is a cDNA molecule with the sequence according to SEQ ID NO 1
- hybridize describes the process in which a single-stranded nucleic acid molecule with a complementary strand undergoes base pairing. In this way, starting from the sequence information disclosed herein, for example, DNA fragments from others
- Plants are isolated as tobacco plants which code for receptor-like protein kinases which have the same or similar properties as the kinase with the amino acid sequence according to SEQ ID NO 2
- c is the concentration and n the length of the hybridizing sequence section in base pairs and a sequence> 100 bp, the expression 500 / n is omitted.
- maximum rigidity at a temperature case, 5-15 ° C below Tm and an ion peak of 15 mM Well (corresponds to 0 1 ⁇ SSC) if a RNA sample ends too early, the melting point is 10-1 ⁇ C higher Preferred hybridization conditions are given below
- N-terminal receptor domains refers to a peptide region which functionally corresponds to the peptide region with an amino acid sequence from position 1 to position 394 of the sequence according to SEQ ID NO 2
- the degree of identity of the nucleic acids is preferably determined with the aid of the NCBI BLASTN version 2 0 4 program (Altschul et al, 1997)
- the present invention also relates to the regulatory regions which naturally control the transcription of the nucleic acids according to the invention in plant cells, in particular in tobacco plants
- regulatory regions refers to untranslated regions of the gene in question, such as promoters, enhancers, repressor or activator binding sites or termination sequences that interact with cellular proteins, thereby controlling transcription
- the present invention furthermore relates to DNA constructs which comprise a nucleic acid according to the invention and a heterologous promoter
- heterologous promoters depend on whether pro- or eukaryotic cells or cell-free systems are used for expression.
- heterologous promoters are the 35S promoter of the cauliflower mosaic virus for plant cells, the promoter of alcohol dehydrogenase for yeast cells, the T3,
- T7 or SP6 promoters for prokaryotic cells or cell-free systems are T7 or SP6 promoters for prokaryotic cells or cell-free systems
- the present invention furthermore relates to vectors which contain a nucleic acid according to the invention, a regulatory region according to the invention or a DNA construct according to the invention.
- vectors which contain a nucleic acid according to the invention, a regulatory region according to the invention or a DNA construct according to the invention.
- All phages, plasmids, phagmids, phasmids, phasmids, cosmids, YACs used in molecular-biological laboratories can be used as vectors.
- BACs, artificial chromosomes or particles that are suitable for particle bombardment can be used
- Preferred vectors are pBIN (Bevan, 1984) and its derivatives for vegetable
- the present invention also relates to host cells which contain a nucleic acid according to the invention, a DNA construct according to the invention or a vector according to the invention
- host cell refers to cells which do not naturally contain the nucleic acids according to the invention
- prokaryotic cells preferably E coh
- E coh prokaryotic cells
- eukaryotic cells ie cells from Saccharomyces cerevisiae, Pichia pastons, insects, plants. Fioschooocytes and cell nuts from nipples
- the present invention further relates to poly peptides with the biological activity of receptor-like protemkinases which are derived from the Measured nucleic acids are encoded in particular polypeptides that represent Se ⁇ n- / Threonm-K ⁇ nasen according to the invention
- polypeptides refers to both short amino acid chains, commonly referred to as peptides, oligopeptides, or oligomers, and longer amino acid chains, commonly referred to as proteins. It includes amino acid chains that are either natural Processes, such as post-translational processing, or can be modified by chemical processes which are state of the art.
- Such modifications can occur at various locations and multiple times in a polypeptide, for example on the peptide backbone, on the amino acid side chain, on the amino and / or at the carboxy terminus They include, for example, acetylation, acylation, ADP ribosylation, amidation, covalent linkage with flavins, ham moieties, nucleotides or nucleotide derivatives, lipids or lipid derivatives or phosphatyhnositol, cyclization, disulfide bridging,
- polypeptides according to the invention can be in the form of "mature” proteins or as parts of larger proteins, for example as fusion proteins. Furthermore, they can secrete or "leader” sequences, pro-sequences, sequences which enable easy purification, such as multiple histidine Have residues or additional stabilizing amino acids
- polypeptides according to the invention do not have to represent complete receptor-like protemkinases, but can also be nui fragments thereof as long as they still have at least one biological activity of the complete protemkinases exercise are still considered to be in accordance with the invention.
- the polypeptides according to the invention need not be derivable from receptor-like protein kinases from tobacco.
- Polypeptides which correspond to receptor-like protein kinases of the following plants, for example, or fragments thereof which can still exert the biological activity thereof are also considered to be according to the invention: corn, wheat, barley, oats, rice, rye, tomatoes, legumes, potato plants, Lactuca sativa, brassicaceae , Wood plants, Physcomitrella patens.
- polypeptides according to the invention can have deletions or amino acid substitutions in comparison to the corresponding region of naturally occurring receptor-like protein kinases, as long as they still exert at least a biological activity of the complete receptors.
- Conservative substitutions are preferred.
- Such conservative substitutions include variations in which one amino acid is replaced by another amino acid from the following group:
- Aromatic residues Phe, Tyr and Trp.
- the present invention thus also relates to polypeptides which exercise at least one biological activity of a receptor-like protein kinase and comprise an amino acid sequence which have an at least 60% identity, preferably an at least 80% identity, particularly preferably an at least 90% identity, very particularly preferably 97-99% identity, with the sequence according to SEQ ID NO 2 over its entire length
- the degree of identity of the amino acid sequences is preferably determined with
- a preferred embodiment of the polypeptides according to the invention is the cvto kinmregulieite receptor-like protein kinase (CRK 1) with the amino acid sequences / according to SEQ ID NO 2
- CRK1 amino acid sequence the 1 1 kinase domains could be determined in which all amino acids defined according to Hanks et al., 1988 are present. It is therefore a serine / threonine kinase.
- the CRKl protein has a transmembrane domain in the region of amino acids 390 and 410.
- the first 28 amino acids with a positively charged amino acid residue and a hydrophobic one
- a region of 15 amino acids at the N-terminus represents a signal sequence.
- the cleavage site is probably located between amino acids 28 and 29. This signal sequence ensures translocation of the newly synthesized CRK1 protein through the membrane of the endoplasmic reticulum and further transport into it plasma membrane.
- CRKl between amino acids 29 and 390 is located extracytoplasmic. This extracellular domain comprises four regions which have> 70% homology to ATP / GTP binding sites or to binding sites for cyclic nucleotides.
- cytokinins are possible ligands.
- cytokinins are structurally similar to purines.
- Cytokinins belong to the group of plant hormones and have the ability to induce cell division. In the meantime, more than 40 naturally occurring cytokinins have been isolated, all of the known cytokinins being adenine derivatives. The activity is determined by the nature of the substituents, especially the N 6 group (overview in Shaw, 1994 and Kaminek, 1992).
- cytokinins In addition to inducing cell division in combination with aux, cytokinins also influence differentiation processes. A high cytokinin to auxin ratio leads to shoot formation in vitro in callus, a high auxm to cytokinin ratio to root formation (Skoog and Miller, 1957). Cytokinins cause a reduction in apical dominance, which results in the budding of the side buds hat (Wickson and Thimann, 1958). The cytokinins also play an important role in delaying leaf senescence
- Cytokinins cause inactivation of proteolytic enzymes, among others Lipases and Lipoxykmasen, which are responsible for the degradation processes. To further classic effects of the cytokinins the demanding influence on the chloroplast development and the inhibition of the root length growth pays
- Cytokinins are necessary for normal plant development. An oversupply of this hormone leads to extremely compact, sterile plants
- CRKl transcript Since the amount of CRKl transcript is regulated by cytokinins, it can be a component of the cytokinin signal transduction pathway. The amount of transcript in CRKl is transiently regulated by cytokinins.
- the gene is then subject to early regulation, 30 minutes after the addition of 5 x 10 7 M BAP there is an almost complete reduction in the amount of transcript.
- the CRK1 transcripts accumulate again after 9-24 h of cytokinin treatment, so that one can assume a transient regulation This regulation could represent negative feedback in order to ensure that a cell is competent for a signal, but this sensitivity can be changed by reducing the amount of protein in signal transduction components.
- the CRK1 receptor it is postulated that the cell after the signal has been recorded is unable to respond to further cytokine signals for a period of time
- biological activity of a receptor-like protein kinase means a change in cell activity and plant growth after ligand binding
- the present invention furthermore relates to antibodies which bind specifically to the polypeptides according to the invention.
- Such antibodies are produced in the customary manner. These antibodies can be used, for example, to identify expression clones, for example a gene bank, which carry the nucleic acids according to the invention
- antibody as used herein also extends to parts of complete antibodies, such as Fa-, F (ab) 2 - or Fv fragments, which still have the ability to bind to the epitopes of the polypeptides according to the invention
- the present invention furthermore also relates to processes for producing the nucleic acids according to the invention.
- the nucleic acids according to the invention can be prepared in the customary manner.
- the nucleic acid molecules can be synthesized completely chemically.
- Short pieces of the nucleic acids according to the invention can also be synthesized chemically and such ohgonucleotides can be labeled radioactively or with a fluorescent dye
- the labeled ohgonucleotides can also be used to search cDNA banks produced from plant mRNA. Clones to which the labeled ohogonucleotides hybridize are selected for the isolation of the relevant DNA fragments. After the characterization of the isolated DNA, the nucleic acids according to the invention
- oligonucleotide (s) as used herein means DNA molecules consisting of 10 to 50 nucleotides, preferably 15 to 30 nucleotides. They are chemically synthesized and can be used as probes.
- the present invention furthermore relates to processes for producing the polypeptides according to the invention.
- host cells which contain nucleic acids according to the invention can be cultivated under suitable conditions.
- the desired polypeptides can then be isolated from the cells or the culture medium in a conventional manner.
- the polypeptides can also be used in in vitro
- a rapid method for isolating the polypeptides according to the invention begins with the expression of a fusion protein, whereby the fusion partner can be easily affinity-purified.
- the fusion partner can be, for example, glutathione S-transferase.
- the fusion protein can then be purified on a glutathione affinity column.
- the fusion partner can be separated by partial proteolytic cleavage, for example on linkers between the fusion partner and the polypeptide according to the invention to be purified.
- the linker can be designed to include target amino acids, such as arginine and lysine residues, which define sites for trypsin cleavage. Standard cloning methods using oligonucleotides can be used to generate such linkers.
- FPLC FPLC
- HPLC gel filtration, reverse phase or slightly hydrophobic columns
- Gel filtration, differential precipitation, ion exchange chromatography and affinity chromatography Since receptor-like protein kinases are membrane proteins, detergent extractions are preferably carried out in the cleaning processes, for example using detergents which have little or no effect on the secondary and tertiary structures of the polypeptides, such as nonionic detergents
- the purification of the polypeptides according to the invention can include the isolation of membranes from host cells which expand the nucleic acids according to the invention.
- such cells expand the polypeptides according to the invention in a sufficient number of copies so that the amount of the polypeptides in a membrane fraction is at least 10 times higher than that which is found in comparable membranes of cells which naturally expand the CRK1 gene, the amount is particularly preferably at least 100 times, very particularly preferably at least 1000 times higher
- compositions containing the polypeptides according to the invention are preferred in terms of protein content compared to a preparation from the Host cells enriched at least 10 times and particularly preferably at least 100 times
- polypeptides according to the invention can also be affinity-purified without a fusion partner with the aid of antibodies which bind to the polypeptides
- the present invention also relates to processes for finding chemical compounds which bind to the polypeptides according to the invention and change their properties. Due to the diverse functions of the receptor-like protein kinases according to the invention, modulators which influence the activity can represent new growth-regulating or herbicidal active compounds.
- modulators which influence the activity can represent new growth-regulating or herbicidal active compounds.
- agonist refers to a molecule which accelerates or amplifies the signal transduction of the receptor-like protein kinases according to the invention, ie the autophosphorylation of the serine and / or threonine residues.
- antagonist refers to a molecule that mediates signal transduction of the receptor-like protein kinases of the invention, i.e. the autophosphorylation of the serine and / or threonine residues is slowed down or prevented.
- modulator represents the generic term for agonist or antagonist.
- Modulators can be small organic chemical molecules, peptides or antibodies that bind to the polypeptides according to the invention.
- modulators can be small organic chemical molecules, peptides or antibodies which bind to a molecule which in turn binds to the polypeptides according to the invention and thereby influences their biological activity.
- Modulators can be natural substrates and ligands or structural or functional mimetics thereof. However, the term “modulator” does not include cytokinins.
- the modulators are preferably small organic chemical compounds.
- the binding of the modulators to the receptor-like protein kinases according to the invention can change the cellular processes in a way which leads to the death of the plants treated with them.
- the present invention comprises methods for finding chemical compounds which change the expression of the polypeptides according to the invention.
- expression modulators can also represent new growth-regulating or herbicidal active ingredients.
- Expression modulators can small organic msch-chemical molecules, peptides or antibodies which bind to the regulatory regions of the nucleic acids coding for the polypeptides according to the invention.
- expression modulators can be small organic-chemical molecules, peptides or antibodies which bind to a molecule which in turn binds to regulatory regions of the encoding the polypeptides of the invention
- Nucleic acids bind and their expression influences expression modulators can also be antisense molecules
- the present invention therefore also extends to the use of modulators of the polypeptides according to the invention or of expression modulators as
- the methods according to the invention include high throughput screening (HTS). Both host cells and cell-free preparations containing the nucleic acids according to the invention and / or the polypeptides according to the invention can be used for this
- a synthetic reaction mix eg products of the in vz / ro transcription
- a cellular component such as a membrane or any other preparation which contains the polypeptides according to the invention
- a labeled substrate or ligand of the polypeptides in the presence and the absence of a candidate molecule, which may be an agonist or antagonist.
- the ability of the candidate molecule to increase or to inhibit the activity of the polypeptides according to the invention is evident from an increased or decreased binding of the labeled ligand or from an increased or decreased conversion of the labeled
- Substrate molecules that bind well and lead to increased activity of the polypeptides according to the invention are agonists.
- Molecules that bind well but do not trigger the biological activity of the polypeptides according to the invention are probably good antagonists.
- the detection of biological Activity of the polypeptides according to the invention can be improved by a so-called reporter system.
- reporter system include, but are not limited to, colorimetrically labeled substrates that are converted to a product or a reporter gene that responds to changes in the activity or expression of the polypeptides of the invention, or other known binding assays.
- Another example of a method with which modulators of the polypeptides according to the invention can be found is a displacement test in which, under suitable conditions, the polypeptides according to the invention and a potential modulator with a molecule which is known to bind to the polypeptides according to the invention, such as a natural substrate or ligand or a substrate or ligand mimetic.
- the polypeptides of the invention themselves can be labeled, e.g. radioactive or colorimetric so that the number of polypeptides that are bound to a ligand or that have undergone a reaction can be determined exactly. In this way, the effectiveness of an agonist or antagonist can be measured.
- the invention furthermore relates to the use of a nucleic acid according to the invention, a DNA construct according to the invention or a vector according to the invention for producing transgenic plants, and the corresponding transgenic plants as such or their parts or propagation material.
- Transgenic plants, parts of plants, protoplasts, plant tissue or plant propagation materials in which, after introduction of a nucleic acid according to the invention, a DNA construct according to the invention or a vector according to the invention, the intracellular concentration of the receptor-like protein kinases in the
- the present invention also relates to an increase or decrease in comparison to the corresponding wild-type forms.
- plant parts as used herein means all above-ground and underground parts and organs of the plants, such as shoot, leaf, flower and
- propagation material means vegetative and generative propagation material such as cuttings, tubers, rhizomes, cuttings and seeds
- the invention also relates to plants, parts of plants, protoplasts, plant tissue or plant propagation materials in which changes to the sequence coding for endogenous receptor kinases are made and selected, which lead to the production of a receptor kinase according to the invention or in which mutagenesis increases or decreases the endogenous receptor kinases. activity is achieved
- endogenous receptor kinase genes already in the plant can be modified by mutagenesis, for example using ethyl methanosulfonate (EMS). After the mutagenesis, individuals can be specifically selected on the basis of the. Sequence analysis, ligand binding studies or analysis of a biochemical reaction caused by the ligand binding Mutagenesis according to the invention produce receptor kinases with increased or reduced activity. In the same way, the expression of a receptor kinase gene according to the invention which is already in the plant can be changed by mutagenesis of the regulatory sequences in such a way that plants with a reduced or increased ligand sensitivity are produced Plants can be identified by well-known methods of gene expression analysis such as Northern blot or Western blot
- the receptor-like protein kinases according to the invention play a role in signal perception, one obtains in transgenic "sense" plants or in plants which are linked to an increased amount or activity of corresponding endogenous receptor kinases or in signaling induction Elements were specifically selected, increased ligand sensitivity
- Transgenic "antisense" plants or plants with reduced receptor kinase activity have a reduced ligand sensitivity.
- An increase or decrease in receptor kinase activity can lead to plants that have a changed development, changed physiology or a changed mophology.
- Representational Difference Analysis is a method for isolating differentially exposed genes.
- the two samples to be compared were formed by a tobacco cell culture, which was cultivated without cytokine addition, and a cell culture which after 5 days of subculturing for 45 min 10 7 M BAP (Benzylaminopu- ⁇ n) was added
- the fragments obtained were clomerized into the vector pUC19.
- the fragment of CRKl was further used as a probe for Northern and Southern blots and in a cDNA library screening to isolate the complete cDNA from
- a cDNA library was produced by the company SCInet in the ⁇ -ZAP-Express Vector according to the manufacturer Stratagene. 400 ⁇ g total RNA of the tobacco suspension culture W 38 was added to the F ⁇ ma It was previously ensured that the searched mR ⁇ ⁇ is expressed in the culture after receipt of the finished cDNA library is called and it is called up in a five-step process Fig. Screen searched for the complete CRKl cDNA The titer of the cDNA library was 1 x 10 9 pfu / ml
- the phage plates were cooled for 1 h at 4 ° C., nylon filters placed for 1 mm, with the DNA side up for 2 min on Whatman 3M filter paper soaked in denaturation solution and 5 min on Whatman 3M filter paper soaked in re-solution solution.
- the filters were briefly incubated dipped in a 2 x SSC solution, dried and irradiated with UV light for DNA fixation (UV-Transil-
- the 5'-RACE is based on the specific amplification of the 5 end of a gene from mRNA. With the aid of a sequence-specific polymer and the AMV reverse transceptase, the first strand of cDNA is synthesized. A poly (A) tail is attached to the product so that an ohgo dT anchor primer and a nested sequence-specific primer can be used in the subsequent PCR. In a second PCR, another nested primer can be used to ensure the specificity
- the cDNA first strand synthesis takes place with an ohgo dT polymer and the subsequent PCR reactions with sequence-specific polymers.
- the products were cloned with the "TA cloning kit" from Pharmacia
- RNA from suspension cell cultures were briefly dried over a Nutsche which was connected to a vacuum pump
- the material was frozen in liquid nitrogen and stored at -80 ° C until the start of RNA isolation
- RNA is precipitated with 0.7 parts by volume of isopropanol and centrifugation at 4000 rpm for 10 mm.
- the collected pellet is resuspended in 2 ml of 4 M lithium chloride for the purification of polysaccharides and again centrifuged for 10 min at 4000 rpm.
- the pellet is dissolved in 2 ml of TES. Buffer resuspended and mixed with 2 ml chloroform for the purification of proteins and phenol residues and centrifuged for 10 min at 4000 rpm to separate the phases 0.3 M sodium acetate (pH 5.2) filled in.
- a centrifugation is carried out for 30 min at 4000 rpm.
- salts from the RN A pellet are washed with 70% alcohol Centrifuged at 4000 rpm for 10 min. After removing the alcohol, the pellet is dried in vacuo and dissolved in 17 ⁇ l TE.
- the principle of purification is based on the separation of polyadenylated mRNA by o / z ' go-öT-coated Dynabeads according to the manufacturer's instructions.
- the yield of mRNA was approximately 1-2% of the total amount of RNA used.
- the agarose is with a final concentration of 1.5% agarose in H 2 O dest. Set on and boiled. After cooling to 60 ° C, 1/10 part by volume of 10 x MOPS buffer and 1/6 part by volume of formaldehyde (37%) are added. EtBr is added to determine identical quantities. After curing, the gel is set to 19 V for 10 min. 50 ⁇ g of the nucleic acid samples and 3 ⁇ l of the length standard (RNA: 0.24-9.5 kb RNA ladder from Gibco BRL Lifetechnologies) are mixed with 2 parts by volume of sample buffer and denatured for 10 min at 65 ° C. in the heating block. The RNA samples are electrophoresed at 45 V for about 5 h.
- Nucleic acid samples are blotted on a nylon membrane.
- 3M Whatman absorbent paper is impregnated with 10 x SSC buffer on a glass pane and attached over two containers so that there are no air bubbles so that its ends are immersed in the containers. These are also filled with 10 x SSC buffers. The gel is placed, topside down, on the 3M Whatman absorbent paper without air bubbles and with the
- Nvlon membrane covered The membrane should not be larger than the gel and Lie on the gel without air bubbles.
- Two layers of 3M Whatman absorbent paper are then placed on top of the nylon membrane.
- the agarose gel is now sealed with film so that no liquid can be sucked past it.
- About 3 cm of absorbent paper, a larger glass pane and then on top of the 3M Whatman absorbent paper a weight of about half a kilogram is placed. Blotting is carried out for at least 6 hours.
- the RNA is fixed by ⁇ J / -c ⁇ os shnk ⁇ ng with a Fluo Link UV lamp. The dose is 0.12 J / cm
- the fragment to be labeled must be clomerized in a vector which has a T3 and / or a T7 promoter, eg pBluesc ⁇ pt.
- the plasmid is digested with a restriction enzyme which is downstream of the sequence to be transcribed to transcribe the entire plasmid prevent after one
- the DNA is subjected to a phenol / chloroform extraction and precipitated
- the sequence of the 15 clone was cut out of the pUC19 vector via Eco RI and Xba I sections and clomerized into the pBluesc ⁇ pt SK vector using the same restriction sections.
- an antisense RNA can be used with the T3 polymerase Synthesized 1 ⁇ g DNA was used for labeling.
- the Stratagene '7/7 vüi o transc ⁇ pt ⁇ on "-K ⁇ t was used and the manufacturer's instructions followed. After the" In viti o Transcnption ", a DNase digestion of 15 min was carried out The RNA was
- Phenol / chloroform shaken out and precipitated. The incorporation rate averaged 5 10 cpnV ⁇ g DNA. After a denaturation, the tagged probe was added to ori-modified Membi Separation of the non-incorporated nucleotides
- a Sephadex G50 column ("Nick Columns", Pharmacia) is washed with 10 ml of water. The labeling mixture and 350 ⁇ l of water are pipetted on, the eluate is discarded. 400 ⁇ l of water are added to the column. The eluate contains the marked sample of 1 ⁇ l of the Eluates are taken to determine the specific activity (cpm / ⁇ g DNA). This should be at least 10 8 cpm / ⁇ g of DNA used. The remaining eluate is denatured for 10 min at 95 ° C. and, after briefly cooling on ice, is added to the hybridization tubes
- the nylon membrane with the fixed nucleic acid is placed in a hybridization tube.
- a prehybination is carried out first with sperm semen.
- 10 ml of hybridization solution per 10 cm 2 membrane are added to the hybridization tubes and with 1 ml of freshly denatured herring sperm solution ⁇ g / ml) each 10 ml hybridization solution added.
- the pre-hybridization takes place, like the hybridization, at 68 ° C. in the hybridization oven.
- the pre-hybridization should take at least half an hour, after which the labeled and freshly denatured DNA sample is added.
- the hybridization is carried out overnight
- the membrane is sealed in foil and an X-ray film is placed on the detection literature
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Abstract
Description
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Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19961519A DE19961519A1 (de) | 1999-12-20 | 1999-12-20 | Rezeptorähnliche Proteinkinasen von Pflanzen |
| DE19961519 | 1999-12-20 | ||
| PCT/EP2000/012488 WO2001046233A1 (de) | 1999-12-20 | 2000-12-11 | Rezeptorähnliche proteinkinasen aus nicotiana tabacum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1250352A1 true EP1250352A1 (de) | 2002-10-23 |
Family
ID=7933455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00983273A Withdrawn EP1250352A1 (de) | 1999-12-20 | 2000-12-11 | Rezeptorähnliche proteinkinasen aus nicotiana tabacum |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20030041345A1 (de) |
| EP (1) | EP1250352A1 (de) |
| JP (1) | JP2003529342A (de) |
| AU (1) | AU2007501A (de) |
| DE (1) | DE19961519A1 (de) |
| WO (1) | WO2001046233A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201817971D0 (en) | 2018-11-02 | 2018-12-19 | British American Tobacco Investments Ltd | Method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995005731A1 (en) * | 1993-08-24 | 1995-03-02 | Cornell Research Foundation, Inc. | Gene conferring disease resistance to plants |
| JP2002534115A (ja) * | 1999-01-12 | 2002-10-15 | ジェネシス リサーチ アンド デベロップメント コーポレイション リミテッド | 植物細胞から単離された組成物及び植物細胞シグナル伝達の改変におけるその利用 |
-
1999
- 1999-12-20 DE DE19961519A patent/DE19961519A1/de not_active Withdrawn
-
2000
- 2000-12-11 AU AU20075/01A patent/AU2007501A/en not_active Abandoned
- 2000-12-11 JP JP2001547142A patent/JP2003529342A/ja active Pending
- 2000-12-11 WO PCT/EP2000/012488 patent/WO2001046233A1/de not_active Ceased
- 2000-12-11 US US10/149,846 patent/US20030041345A1/en not_active Abandoned
- 2000-12-11 EP EP00983273A patent/EP1250352A1/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0146233A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003529342A (ja) | 2003-10-07 |
| US20030041345A1 (en) | 2003-02-27 |
| WO2001046233A1 (de) | 2001-06-28 |
| AU2007501A (en) | 2001-07-03 |
| DE19961519A1 (de) | 2001-06-21 |
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