WO2005085444A1 - キチンオリゴ糖エリシター結合タンパク質 - Google Patents
キチンオリゴ糖エリシター結合タンパク質 Download PDFInfo
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- WO2005085444A1 WO2005085444A1 PCT/JP2005/003451 JP2005003451W WO2005085444A1 WO 2005085444 A1 WO2005085444 A1 WO 2005085444A1 JP 2005003451 W JP2005003451 W JP 2005003451W WO 2005085444 A1 WO2005085444 A1 WO 2005085444A1
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Classifications
-
- 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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/40—Liliopsida [monocotyledons]
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/16—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material 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)
- C12N15/8216—Methods for controlling, regulating or enhancing expression of transgenes in plant cells
- C12N15/8218—Antisense, co-suppression, viral induced gene silencing [VIGS], post-transcriptional induced gene silencing [PTGS]
Definitions
- the present invention relates to a protein that binds to chitin oligosaccharide elicitor.
- FLS2 receptor kinase gene
- chitin which is a polysaccharide constituting the cell wall of filamentous fungi, at a low concentration of the order of nM of chitin, a fragment of a specific size. It has been shown to cause inflow and outflow, protein phosphorylation, generation of active oxygen, jasmonic acid synthesis, and gene expression of chitinase ⁇ PAL (feralalanin ammonia lyase) (Non-Patent Document 116) reference).
- Non-specific S literature 1 Yamada, A., Shiouya, ⁇ ⁇ , Kodama, ⁇ . And Akatsuka, ⁇ : Induction of phytoalexin formation in suspension— cultured rice cells by
- Non-Patent Document 2 Minami, ⁇ ⁇ , Kuchitsu, ⁇ ⁇ , He, D.- ⁇ ⁇ , Kouchi, ⁇ ⁇ , Midoh, Mid ⁇ ,
- Ohtsuki, Y. and shibuya Two novel genes rapidly and transiently activated in suspension-cultured rice cells by treatment with N— acetylchitoheptaose, a biotic elicitor for phytoalexin production. Plant Cell Physiol., 37, 5D3 (199b;
- Non-Patent Document 3 Kikuyama, M., Kuchitsu, K. and Shibuya, N .: Membrane
- Non-Patent Document 4 He, D.-Y., Yazaki, Y “Nishizawa, Y” Takai, R “Yamada, K” Sakano,
- Non-Patent Document 7 Shibuya, ⁇ ⁇ , Kaku, ⁇ , And Maliarik, MJ: Identification of a novel high— affinity binding site for N— acetylchitooligosaccharide elicitor in the membrane fraction from suspension-cultured rice cells.FEBS Lett., 329, 75-78 (1993)
- Non-Patent Document 8 SWbuya, N "Ebisu, N” Kamada, Y “Kaku, H” Cohn, J. and Ito, Y .: Localization and binding characteristics of a high-affinity binding site for
- N--- acetylcnitooligosaccharide in the plasma membrane from suspension-cultured rice cells suggest a role as a receptor for the elicitor signal at the cell surface.
- Non-Patent Document 9 Ito, Y., Kaku, H. and Shibuya N .: Identification of a high-affinity binding protein for N— acetylchitooligosaccharide elicitor in the plasma membrane of suspension-cultured rice cells by affinity labeling. The Plant Journal, 12 (2), 347-356 (1997)
- An object of the present invention is to provide a protein that binds to chitin oligosaccharide elicitor, and a method for using the same.
- the elicitor-bound protein was isolated and purified in good yield.
- the N-terminal amino acid sequence and the internal chain amino acid sequence were decoded, and cDNA encoding the protein of the present invention was successfully isolated from the rice cDNA library based on the amino acid sequence information.
- the protein of the present invention is a glycoprotein and binds to Con A lectin. So Con An antibody against the rice plasma membrane fraction binding to the A column was prepared, and various chromatographic techniques were devised to purify an antibody against the target protein (anti-Con A-CEBiP antibody). The effect of anti-Con A-CEBiP antibody on elicitor-responsive active oxygen production was examined.Pretreatment with anti-Con A-CEBiP antibody inhibited active oxygen production, It was suggested that it was a receptor protein involved in the elicitor response.
- the sugar elicitor treatment of transfected cells in which the expression of the CEBiP gene was specifically knocked down by the RNAi method resulted in suppression of the production of active oxygen, indicating that the protein of the present invention responded to the chitin oligosaccharide elicitor response. It was suggested that the receptor protein was involved.
- microarray analysis showed that more than 70% of the genes that respond to chitin oligosaccharide elicitor in cultured rice cells lost their responsiveness by decreasing the expression level of CEBiP. It has been confirmed that the protein is a receptor protein and plays an important role in elicitor signaling.
- the present invention provides the following [1]-[16].
- a DNA encoding a plant protein having a binding activity to chitin oligosaccharide elicitor according to any one of the following (a) to (d):
- [5] A transformed plant cell which carries the DNA of [1] or [2], or the vector of [4].
- [6] A transformed plant comprising the transformed plant cell according to [5].
- [7] The transformed ⁇ 3 ⁇ 4 object according to [6], which is derived from rice.
- [10] The method for producing a transformed plant according to any one of [6]-[8], wherein the DNA according to [1] or [2] or the vector according to [4] is used.
- a method comprising the step of introducing into a plant cell and regenerating a plant from the plant cell.
- An agent for controlling plant diseases comprising the DNA of [1] or [2] or the vector of [4].
- [14] A method for controlling plant diseases, comprising expressing the protein of [3] in cells of a plant.
- FIG. 1 is a diagram and a photograph showing purification of a chitin elicitor binding protein derived from rice cultured cells.
- FIG. 2 is a view showing a method for purifying an anti-Con A-CEBiP antibody.
- FIG. 4 is a graph showing the effect of an anti-CEBiP antibody or antiserum on active oxygen generation.
- FIG. 5 is a view showing the amino acid sequence of the N-terminal 32 residues obtained by the peptide sequencer.
- FIG. 6 is a schematic diagram of clawing of an oligochitin binding protein.
- FIG. 7 is a diagram showing a cDNA of a rice-derived chitin elicitor binding protein.
- the nucleotide sequence in the figure is shown in SEQ ID NO: 5, and the amino acid sequence is shown in SEQ ID NO: 6.
- FIG. 8 is a photograph showing a result of genomic Southern blot analysis.
- FIG. 9 shows the results of collation of the sequence of chitin elicitor binding protein with the sequence of genomic DNA
- FIG. 10 is a photograph showing the effect of (GlcNAc) on the expression of CEBiP in soluble dandelion cultured cells.
- FIG. 11 is a view showing the results of measuring the molecular weight of CEBiP by MALDI TOF-MS.
- FIG. 12 is a photograph showing removal of sugar chains of CEBiP by TFMS.
- FIG. 13 is a view showing a base sequence of a CEBiP gene fragment in a CEBiP-RNAi vector.
- FIG. 14 is a photograph of expression analysis of CEBiP gene protein and RNA levels in untransformed and transformed rice cells.
- FIG. 15 is a graph showing the production of active oxygen by non-transformants and CEBiP-RNAi rice cells by elicitor.
- FIG. 16 is a graph showing the production of active oxygen in non-transformants and CEBiP-RNAi rice cells by elicitor treatment.
- FIG. 17 (A) is a graph showing the number of genes whose expression levels increase and decrease by elicitor treatment in non-transformants and CEBiP-RNAi # 6 rice cells. (B) A functional classification graph of genes that were significantly suppressed by knockdown of the CEBiP gene.
- the present inventors isolated and purified chitin oligosaccharide elicitor-binding protein (CEBiP) in a plant at a high yield and decoded the gene sequence.
- CEBiP chitin oligosaccharide elicitor-binding protein
- the present invention provides a DNA encoding a plant protein having a binding activity to chitin oligosaccharide elicitor described in any one of the following (a) to (d), and a DNA encoded by the DNA: To provide proteins.
- the plant in the present invention is not particularly limited, and includes, for example, cereals, vegetables, and Useful agricultural crops such as fruits, ornamental plants such as houseplants and the like can be mentioned.
- examples of the plant include rice, corn, wheat, barley, rape, soybean, peta, carrot, tomato, potato, chrysanthemum, rose, carnation, cyclamen, and Arabidopsis.
- the plant of the present invention preferably includes rice.
- the nucleotide sequence of the cDNA of the elicitor binding protein of the present invention is shown in SEQ ID NO: 1, and the amino acid sequence of the protein encoded by the cDNA is shown in SEQ ID NO: 2.
- the nucleotide sequence of the DNA is shown in SEQ ID NO: 3, and the amino acid sequence of the protein encoded by the DNA is shown in SEQ ID NO: 4.
- the protein of the present invention contains four types of sequences (sequences from 139 to 152, sequence from 154 to 161 in the sequence listing of SEQ ID NO: 4, sequence from 164 to 176 in the sequence listing, And 177 to 182 sequences).
- the DNA of the present invention can be isolated by those skilled in the art by generally known methods. For example, hybridization technology (Southern, EM., J Mol Biol, 1975, 98, 503.) and polymerase chain reaction (PCR) technology (Saiki, RK. Et al., Science, 1985, 230, 1350. , Saiki, RK. Et al., Science 1988, 239, 487.). That is, the DNA having the nucleotide sequence shown in SEQ ID NO: 1 or 3 or a part thereof is probed, and specifically hybridizes with the DNA having the nucleotide sequence shown in SEQ ID NO: 1 or 3.
- hybridization technology Southern, EM., J Mol Biol, 1975, 98, 503.
- PCR polymerase chain reaction
- the DNA of the present invention also includes a DNA that can be isolated by the hybridization technique or the PCR technique and that hybridizes with the DNA having the base sequence described in SEQ ID NO: 1 or 3.
- low stringent hybridization conditions are 5X SSPE, 1% SDS (W / V), 0.1% BSA, 0.1% polybutylene. Pyrrolidone, 0.1% Ficoll 400, 100 ⁇ g / ml denatured salmon testis DNA, or equivalent stringency hybridization conditions.
- High stringency hybridization conditions such as 25% formamide (V / V), 5X Under the conditions of SSPE, 1% SDS (W / V), 0.1% BSA, 0.1% polybutylpyrrolidone, 0.1% ficoll 400, 100 ⁇ g / ml denatured salmon testis DNA, more homologous DNA can be isolated. There is expected.
- the thus isolated DNA is considered to have high homology at the amino acid level with the amino acid sequence of SEQ ID NO: 2 or 4.
- High homology refers to at least 35%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 98% or more sequence identity over the entire amino acid sequence.
- the present invention also provides a protein structurally similar to the elicitor-binding protein of the present invention, and a DNA encoding the protein.
- a DNA encoding such a protein include a DNA encoding a protein in which one or more amino acids are substituted, deleted, added, and Z or inserted in the protein.
- a DNA encoding a glycoprotein having a site capable of binding to a sugar chain (NXT (S)), which is a homologue of the elicitor binding protein of the present invention, and having a LysM domain can be exemplified.
- the number of amino acids to be modified is not particularly limited as long as the modified protein is structurally similar to the elicitor-binding protein of the present invention, but is generally within 50 amino acids, preferably within 30 amino acids. It is more preferably within 10 amino acids (for example, within 5 amino acids, within 3 amino acids). Amino acid modifications are preferably conservative substitutions.
- the hydropathic index for each amino acid before and after modification (Kyte and Doolitte, (1982) J Mol Biol. 1982 May 5; 157 (1): 105-32) and Hydrophilicity value (U.S. Pat. Is preferably within ⁇ 1, more preferably within ⁇ 1, and most preferably within ⁇ 0.5.
- the amino acid sequence of the encoded protein is mutated due to the mutation of the base sequence.
- the mutation may be accompanied by a mutation of an amino acid in a protein (degenerate mutation), and such a degenerate mutant DNA is also included in the present invention.
- the DNA of the present invention includes genomic DNA, cDNA, and chemically synthesized DNA. Preparation of genomic DNA and cDNA can be performed by a person skilled in the art using conventional means.
- genomic DNA for example, plant power having a gene encoding the above-mentioned plant elicitor binding protein is also extracted from genomic DNA, and a genomic library (plasmid, phage, cosmid, BAC, PAC, etc. can be used as a vector). ), Developed, and subjected to colony cloning, hybridization, or plaque hybridization using a probe prepared based on the DNA encoding the protein.
- the primers can be prepared by preparing a primer specific to the DNA encoding the above-mentioned elicitor-binding protein and performing PCR using the primer.
- a cDNA for example, a cDNA is synthesized based on mRNA extracted from a plant having a gene encoding the protein, and the cDNA is inserted into a vector such as ⁇ ZAP to prepare a cDNA library, which is developed.
- a cDNA library which is developed.
- it can be prepared by performing colony hybridization or plaque hybridization in the same manner as described above, or by performing PCR.
- DNAs of the present invention those of natural origin are induced by chitin oligosaccharide elicitor. Therefore, it is possible to determine whether or not the biological defense mechanism is operating on the test plant or the test plant cell using the induction of the DNA of the present invention as an index.
- the DNA of the present invention can be used for producing a transformed plant whose phenotype has been modified by controlling its expression.
- the DNA of the present invention can be used, for example, for preparing a recombinant protein. Elicitus is an important substance in the study of the molecular mechanism of the signal transduction process in plant defense.
- the DNA of the present invention is inserted into an appropriate expression vector, the vector is introduced into appropriate cells, and the transformed cells are cultured and expressed. Purify the protein.
- the recombinant protein can be expressed as a fusion protein with another protein for the purpose of facilitating purification or the like. For example, a method for preparing a fusion protein with maltose binding protein using E.
- coli as a host (vector pMAL series released by New England BioLabs, USA) and a method for preparing a fusion protein with glutathione-S-transferase (GST) ( It is possible to use a vector pGEX series released by Amersham Pharmacia Biotech), a method of preparing by adding a histidine tag (pET series of Novagen), and the like.
- the host cell is not particularly limited as long as it is a cell suitable for expressing the recombinant protein.
- Escherichia coli for example, yeast, various animal and plant cells, insect cells, and the like can be used by changing the expression vector. Is possible.
- a vector into a host cell for introduction into E. coli, an introduction method using calcium ion (Mandel, M. & Higa, A., Journal of Molecular Biology, 1970, 53, 158-162., Hanahan, D., Journal of Molecular Biology , 1983, 166, 557-580.) Can be used.
- the recombinant protein expressed in the host cell can be purified and recovered from the host cell or its culture supernatant by a method known to those skilled in the art. When the recombinant protein is expressed as a fusion protein with the above-mentioned maltose-binding protein or the like, affinity purification can be easily performed.
- the protein encoded by the DNA of the present invention thus produced is also included in the present invention.
- the protein of the present invention can also be isolated and purified from the plasma membrane of plant cultured cells.
- the present invention also includes a protein purified by the following steps.
- Step of solubilizing plasma membrane proteins with detergent (2) a step of binding the chitin oligosaccharide elicitor-binding protein in the soluble fraction obtained in (1) to a (GlcNAc) -APEA derivative
- Such a protein has, at the N-terminus, a sequence from the 1st to the 32nd of SEQ ID NO: 4 in the sequence listing, and contains four kinds of sequences therein (from the 139th position of the sequence listing SEQ ID NO: 4). It is a glycoprotein having a sequence up to position 152, a sequence from positions 154 to 161; a sequence from positions 164 to 176; and a sequence from positions 177 to 182). More specifically, OVA (ovalbumin) was first applied to the solubilized plasma membrane during column operation to prevent loss due to non-specific adsorption on the glass surface of the tube or column. Apply to three types of column (pre-column).
- the first and second columns are used to remove substances adsorbed on the Sepharose gel carrier ⁇ dextran, and the third column adsorbs the target protein of the present invention.
- the precolumn is not limited to the above two.
- the chitin oligosaccharide is not immobilized on the column for adsorbing the target protein, but the adsorption capacity is increased by using (GlcNAc) -APEA (aminophenylethylamino) derivative.
- the column force then also elutes the protein of the invention.
- wash the column with a non-elicitor saccharide similar in binding mode and structure to chitin oligosaccharide! /, But not active !, saccharide
- the protein is also eluted by the column force.
- an antibody that binds to the protein can also be prepared.
- a polyclonal antibody can be prepared from a serum obtained by immunizing an immunized animal such as a heron with a purified protein of the present invention or a partial peptide thereof, collecting blood after a certain period of time, and removing blood. is there.
- Monoclonal antibodies can be obtained by fusing antibody-producing cells of an animal immunized with the above protein or peptide with bone tumor cells, isolating a single clone cell (hybridoma) producing the desired antibody,
- the antibody can be prepared by obtaining the antibody.
- the antibody thus obtained can be used for purification and detection of the protein of the present invention.
- the present invention includes an antibody that binds to the protein of the present invention. Further, the antibody of the present invention includes an antiserum, Includes polyclonal, monoclonal and fragments of these antibodies.
- the present invention also relates to a vector containing the above DNA or nucleic acid, a transformed plant cell carrying the vector, a transformed plant containing the transformed plant cell, a trait that is a progeny or a clone of the transformed plant.
- a transformed plant and a propagation material for the transformed plant.
- the plant of the present invention can be used for producing the protein of the present invention. Further, the plant has a function of controlling diseases such as blast.
- the DNA of the present invention is inserted into an appropriate vector, and this is introduced into a plant cell. Regenerate cells.
- the present invention relates to the above-mentioned method for producing a transformed plant, comprising introducing the DNA or nucleic acid of the present invention or the vector of the present invention into a plant cell, and transforming the plant from the plant cell.
- a method comprising the step of regenerating is provided.
- DNA or nucleic acid of the present invention into plant cells is carried out by those skilled in the art by known methods, for example, the agrobacterium method, the electroporation method (elect-poration method), and the particle gun method. can do.
- the recombinant vector is transformed into Agrobacterium bacteria, and the transformed Agrobacterium is then introduced into plant cells by a known method such as a leaf disk method.
- the above vector contains an expression promoter so that, for example, after introduction into a plant, the DNA of the present invention is expressed in the plant.
- the DNA of the present invention is located downstream of the promoter, and a terminator is located downstream of the DNA.
- the recombinant vector used for this purpose is appropriately selected by those skilled in the art according to the method of introduction into a plant or the type of a plant. Examples of the above promoter include CaMV35S derived from cauliflower mosaic virus, corn ubiquitin promoter (JP-A-2-79983), and the like.
- Examples of the terminator include a terminator derived from cauliflower mosaic vinoles and a terminator derived from a nopaline synthase gene.
- Examples of the terminator include a promoter and a terminator that function in a plant. Not limited to these Yes.
- Plants into which the DNA or nucleic acid of the present invention is introduced may be explants, or cultured cells may be prepared from these plants and introduced into the resulting cultured cells.
- the “plant cells” of the present invention include, for example, plant cells such as leaves, roots, stems, flowers, and scutellum in seeds, calli, suspension cultured cells, and the like.
- the above-mentioned recombinant vector contains an appropriate selectable marker gene, or contains a selectable marker gene. Preferably, it is introduced into a plant cell together with the plasmid vector.
- Selectable marker genes used for this purpose include, for example, the hygromycin phosphotransferase gene, which is resistant to the antibiotic hygromycin, the neomycin phosphotransferase, which is resistant to kanamycin or gentamicin, and the herbicide phosphinothricin.
- a cetyltransferase gene is used for this purpose.
- the plant cells into which the recombinant vector has been introduced are placed on a known selection medium containing an appropriate selection agent according to the type of the introduced selection marker gene, and cultured. As a result, transformed plant culture cells can be obtained.
- a plant is regenerated from a transformed cell into which the DNA or nucleic acid of the present invention has been introduced.
- Plant regeneration can be performed by a method known to those skilled in the art depending on the type of plant cell (Toki. Et al., Plant Physiol, 1995, 100, 1503-1507.).
- a method for producing a transformed plant is to introduce a gene into protoplasts using polyethylene glycol and regenerate the plant (Indian rice varieties are suitable) (Datta, S.
- the plant regenerated from the transformed cells is cultured in a conditioned medium in the next step. Thereafter, when the acclimated regenerated plant is cultivated under normal cultivation conditions, the plant can be obtained and matured and fruited to obtain seeds.
- the presence of the introduced foreign DNA or nucleic acid in the transformed and cultivated transformed plant is determined by a known PCR method or Southern hybridization method, or It can be confirmed by analyzing the base sequence of the nucleic acid therein.
- extraction of the DNA or nucleic acid having the transforming property can be performed according to the known method of J. Sambrook et al. (Molecular and loning, 3 ⁇ 4f23 ⁇ 4x, Cold bpnng Harbor laboratory Press, 1989). .
- the nucleic acid extracted from the regenerated plant as described above is increased to type III. Perform a width response.
- the nucleic acid of the present invention is DNA
- a synthesized oligonucleotide having a base sequence appropriately selected according to the base sequence of the DNA is used as a primer, and amplified in a reaction mixture in which these are mixed.
- a reaction can also be performed.
- DNA denaturation, annealing and extension reactions are repeated several tens of times to obtain an amplification product of a DNA fragment containing the DNA sequence of the present invention.
- the reaction solution containing the amplification product is subjected to, for example, agarose electrophoresis, various amplified DNA fragments are fractionated, and it is possible to confirm that the DNA fragments correspond to the DNA of the present invention. is there.
- controlling a plant disease means a function of enhancing a plant's self-defense reaction against invasion of a pathogen such as a pathogenic bacterium or a pest. Specifically, it refers to functions such as depolarization of membranes, generation of active oxygen, and synthesis of antibacterial substances such as phytoalexin, which occur when a plant receives a disease.
- Examples of the disease include sheath blight, wheat wilt, oat spot and rice sesame leaf blight. Preferably, it is rice blast.
- the agent of the present invention is the DNA or vector of the present invention itself, or a composition containing the DNA or vector of the present invention.
- the “composition” can contain various substances. Such a substance is not particularly limited as long as the composition can achieve the object of the present invention, and for example, a substance for stably presenting the DNA or vector, the DNA or Substances that assist the introduction of the vector into the plant cells, substances for increasing the amount of DNA and the vector that facilitate the measurement of the vector, and the like can be mentioned.
- the present invention also provides a method for controlling plant diseases, which comprises expressing the protein of the present invention in cells of a plant.
- the method for expressing a protein or the like in a plant cell is as described above.
- the present invention further provides an antisense DNA against the DNA of the present invention.
- an antisense DNA against the DNA of the present invention By introducing such a vector containing antisense DNA into plant cells, transformed sickle cells in which the expression of the protein of the present invention has been specifically knocked down can be produced.
- the created transformed plant cells can be used for analyzing the function of the protein of the present invention.
- Cultured rice cells (Oryza sativa L. cv. Nipponbare) use L medium (Kuchitsu, K., Kikuyama, M., and Shibuya, N. Protoplasma, 174, 79-81 (1993)) modified from N6 medium.
- L medium Keritsu, K., Kikuyama, M., and Shibuya, N. Protoplasma, 174, 79-81 (1993)
- the culture was performed in an incubator at 25 ° C. in the dark under shaking conditions of 150 rpm, and subculture was maintained and propagated by shaking culture, and used for experiments.
- the rice cultured cells are lined up once every two weeks on a sterile Was passaged.
- the one that had been subjected to this treatment and had a force of 4 days or more was used.
- the plasma membrane was prepared by the method of Shibuya et al. (Shibuya, N., Ebisu, N.,
- Microsomal fraction (MF) obtained by differential centrifugation according to Kamada, ⁇ ., Kaku, ⁇ ., Cohn, J. and Ito, Y. Plant Cell Physiol, 37, 894-898 (1996)).
- MF Microsomal fraction
- the obtained plasma membrane fraction was suspended in 12 ml of PM buffer, homogenized by sonication, and stored at -80 ° C.
- the chitin oligosaccharide ((GlcNAc)) used as the elicitor is a hexamer or less using a fine grade sample manufactured by Seikagaku Corporation, and the heptamer and octamer are transferred from Yaizu Fisheries Chemical Industry.
- the chitosan oligosaccharide heptamer and octamer derived from the force-shell were prepared by re-acetylation.
- Elicitor-binding protein affinity labeling with dartartaldehyde is based on the fact that the amino group of the 125 I- (GlcNAc) -APEA derivative and the amino group of the protein side chain form NaCNBH.
- the affinity column used for CEBiP protein purification was (GlcNAc) -APEA derivative (75
- CEBiP Purification of CEBiP was performed as follows. Plasma membrane fraction (20.46 mg) was added to 0.5% Triton X-100 in TBS buffer (2 mM DTTM ImM PMSF, 0.15 M NaCl, ImM MgCl,
- TritonX-100 and n-dodecy beta-maltoside were effective in dissolving the elicitor binding protein from the plasma membrane of rice cultured cells.
- concentration of 0.5% Triton X-100 is 60% of the plasma membrane proteins are Ka ⁇ I ⁇ , from binding experiments with Erishita induction body was 125 1 label, about 30% of the Erishita binding protein were recovered as active .
- the binding activity in the solubilized fraction shows binding characteristics that correspond well to the results obtained using the plasma membrane, and the results of affinity labeling show that the target elicitor-binding protein retains its activity and is solubilized. It was confirmed that it was done.
- the eluted fraction was immediately neutralized with 1 M Tris solution to make a total volume of 275 ⁇ l, and then 25 ⁇ l of 5 M NaCl and 1.2 ml MeOH were added to each tube, and the mixture was removed at -80 ° C. Left overnight.
- the target protein was recovered by centrifugation and dissolved to a final volume of 80 ⁇ l. 1 ⁇ l of the mixture was subjected to precast polyacrylamide concentration 8-18% gradient gel using a Multiphor II multipurpose electrophoresis apparatus.
- the remaining purified protein solution was subjected to ATTO 15% polyacrylamide SDS electrophoresis, transferred to a PVDF membrane, and subjected to CBB staining.
- the band of the target protein was cut out, and then subjected to HP241 protein sequencer system (HEWLETT PACKARD). The N-terminal amino acid sequence was analyzed.
- the internal chain analysis of the target protein was performed by the following method. Gel force band was cut out, immersed in 501 of 0.1% SDS ⁇ 1 mM EDTA ⁇ 0.1 M Tris-HCl (pH 9.0), and lysed with lysine-specific protease (lysinoreendopeptidase, Achromobacter protease I). ° C ⁇ ⁇ digested. The digested fluid was separated on a coupled column of DEAE-5PW (1 ⁇ 20 mm; Tosoh, Tokyo) and Mightysil RP-18 (1 ⁇ 50 mm; Kanto Chemical, Tokyo). As a solvent, 0.085% TFA aq.For A, use 0.075% TFA, 80% CH CN.Aq for B, 1-12.5-60
- the adsorption capacity of the column carrier was significantly improved by the development of the method of immobilizing chitin oligosaccharide as an APEA derivative instead of immobilizing the chitin oligosaccharide as it was.
- the N-terminal amino acid sequence of 32 residues could be deciphered with no modification of the N-terminal amino acid residue artificially in the purification process and with an improvement in the yield.
- This also allowed us to separate and purify peptides specifically cleaved with specific peptidases and to analyze the four internal chain amino acid sequences from the analysis.
- CEBiP is a glycoprotein that binds to concanapalin A (Con A). Therefore, antiserum was prepared against the rice plasma membrane fraction bound to the Con A column, and various chromatographic methods were devised to purify the antiserum (anti-Con A-CEBiP antibody) against the fraction containing the target protein. did.
- An anti-Con A-CEBiP antiserum was prepared according to the following procedure. Using a Con A-Sepharose column, total proteins that bind to Con A in the solubilized rice plasma membrane fraction were prepared. Using this as an antigen, magpies were immunized to obtain anti-Con A-bound fra. Antiserum.
- This antiserum was purified by the following method (Fig. 2). From rice plasma membrane fraction (GlcNAc)
- Protoplasts were also prepared from cultured rice cells, and the effect of anti-ConA-CEBiP antibodies on elicitor-responsive reactive oxygen generation was examined.
- the medium was gently soaked at 30 ° C for 6 hours.
- the cells were filtered through a 25 / zm nylon mesh, and the cells on the mesh were washed with 20 ml of Washing buffer (0.1% CaCl / 0.4 M Mannitol) (
- Luminol and potassium ferricyanide used 50 mM potassium phosphate buffer pH 7.9 as a solvent. Potassium ferricyanii was prepared immediately before use, and the luminol solution, which had been stored at low temperature and protected from light, was returned to room temperature before use.
- Rice proplast (lxlO 6 cells / 500 ⁇ l) was placed in a 2 ml tube, and reacted with a preimmune antiserum or anti-Con A-CEBiP antibody for 30 minutes, and then ((GlcNAc), 100 ( ⁇ g / ml)
- R2P medium 1 ⁇ l or R2P medium was added, and the mixture was slowly stirred for 15 minutes, and then centrifuged at 1000 rpm for 1 minute to obtain a supernatant. Also, add R2P medium or (GlcNAc) 11 to the same concentration of protoplasts
- Luminescence was measured and a standard curve was created and calculated.
- the present protein is a receptor protein of chitin oligosaccharide elicitor.
- Rice (Nipponbare) culture cell power was also determined by isolating PolyA RNA (mRNA) by the phenol'SDS method and oligo dT method, and using this as a type II to prepare a rice culture cell cDNA library using the ZAP-cDNA synthesis kit (STRATAGENE).
- mRNA PolyA RNA
- STRATAGENE ZAP-cDNA synthesis kit
- the anti-peptide antibody produced reacted only with the target protein showing a single band.
- Positive clones obtained by screening a rice cDNA library were known to be different from the receptor. Had a sequence similar to that of this protein.
- the target protein is synthesized in Escherichia coli in a form containing the signal peptide, and therefore, it may be difficult to react with the anti-peptide antibody due to the problem of steric hindrance.
- the present inventors considered that rice (Nipponbare) is frequently used, and that the upstream corresponding to the N-terminal amino acid sequence of 7 residues ("KSAILYTZ SEQ ID NO: 10 (reverse)) combined with codons" Orientation 72 types of primers were synthesized, and the rice cultured cell cDNA library was converted into type II, and PCR was performed with each synthetic primer and the known primers on the vector (Figs. 5 and 6).
- Synthetic primers (TGTAGAGGATGGCGGACTTZ) No .: 11) and the reverse primer of the vector (GGAAACAGCTATGACCATGZ, SEQ ID NO: 12), PCR was performed, and as a result, a PCR amplification product corresponding to the target amino acid sequence was successfully obtained.
- the sequence of the PCR fragment obtained at this time was 280 bp, and the sequence of the translated protein was the same as that of the residue before the signal peptide. , Was the beginning 49 amino acid residues from T.
- genomic DNA isolated from rice was treated with various restriction enzymes, electrophoresed on an agarose gel, and genomic Southern blot analysis was performed using the DNA encoding the target protein as a probe. .
- genomic Southern blot analysis was performed using the DNA encoding the target protein as a probe.
- a single band was detected in genomic DNA treated with several types of restriction enzymes (Fig. 8), suggesting that the target elicitor-binding protein gene was a single copy.
- the chitin elicitor-binding protein had 328 amino acid residues including a transmembrane region having 22 amino acid residues on the C-terminal side, and had a molecular weight of 34,640.
- peptide sequence analysis suggested that sugar chains had been added at four sites out of 11 sites that can bind to sugar chains (NXT (S)).
- NXT (S) sugar chains had been added at four sites out of 11 sites that can bind to sugar chains
- a motif search revealed that two LysM domains existed in the peptide darican binding protein (Fig. 7). It is clear that there are Y85-P131 (sequence number 85 to 131 in the sequence listing) and Y149-P192 (sequence number 149 to 192 in the sequence listing) became.
- the molecular weight of the target protein initially far from the protein and the molecular weight of 75kDa obtained in Afi two tee first label by 125 1 labeled Erishita sugar was.
- the present inventors have already detected the target protein at 75,000 by electrophoresis using a precast type polyacrylamide concentration 8-18% gradient gel (Pharmacia) with a Multiphor II multipurpose electrophoresis apparatus.
- a precast type polyacrylamide concentration 8-18% gradient gel Pulcoa
- Multiphor II multipurpose electrophoresis apparatus On the other hand, in the case of using ATTO's slab electrophoresis apparatus, it was reported that it was detected at 65,000 to 67,000 (Okada, M., Matsumura, M., and Shibuya , N., J Plant Physiol. 158, 121-124 (2001)).
- the rainbow protein standards used so far are very broad, and using molecular weight standards prepared with more accurate recombinant proteins, the target protein, which previously had 65-67 kDa, would have a molecular weight of 56 kDa.
- MALDI TOF-MS (Bruker ReFlex) was used to measure the molecular weight of CEBiP more accurately. As a result, mainly two peaks of 40 kDa and 35 kDa were obtained (FIG. 11). These differences in molecular weight were thought to be due to differences in sugar chains added to CEBiP.
- TFMS trifluoromethanesulfonic acid
- the anti-CEBiP antiserum was prepared by the following method.
- CEBiP was expressed in an Escherichia coli mass expression system. Specifically, a cDNA fragment corresponding to the target protein was also prepared by PCR except for the transmembrane region, and inserted into pET16b, a polyhistidine-labeled vector, to confirm the sequence. The nucleotide sequence of the cDNA fragment is shown in SEQ ID NO: 7, and the amino acid sequence of the protein encoding the cDNA is shown in SEQ ID NO: 8. This was introduced into E. coli BL21, and LB medium containing 200 g / ml carbecillin was The cells were cultured in the ground at 37 ° C for 4.5 hours. E.
- coli was collected by centrifugation and resuspended in 1 ml of LB medium containing the same concentration of rubecillin, and 501 was added to 8 ml of LB medium containing carbecillin (final concentration 500 g / ml). The mixture was cultured and cultured for 3 hours. The E. coli was collected by centrifugation, resuspended in 8 ml of LB medium containing carbecillin (final concentration 500 g / ml), added with IPTG (final concentration 1 mM), and cultured at 30 ° C for 2 hours. After this, the cells were collected by centrifugation (10000 rpm, 20 ° C) and stored at -80 ° C.
- the cells expressing CEBiP were suspended in PBS, crushed with a sock, and centrifuged to obtain a precipitate fraction.
- the precipitate fraction was subjected to SDS electrophoresis.
- the gel band containing the expressed protein was cut out, PBS was mashed, crushed in a mortar, and stirred at 4 ° C overnight to extract the target protein. Using this as an antigen, magpies were immunized to obtain anti-CEBiP antiserum.
- TFMS treatment and detection of the target protein were performed by the following methods.
- the rice plasma membrane fraction (20 / zg) was placed in a screw cap bottle, dried sufficiently, dissolved in trifluoromethanesulfonic acid (TFMS ⁇ O / zl), and allowed to stand at 0 ° C for 1 hour.
- the solution was neutralized with 500 ⁇ l of 1 M Tris ice-cold, then 275 ⁇ l was dispensed into each tube, 27.5 ⁇ l of 5 ⁇ NaCl and 1.2 ml MeOH were added, and the mixture was added at -80 ° C.
- the mixture was centrifuged to obtain a precipitate fraction, which was subjected to SDS electrophoresis and Western Boltting, and the target protein was detected with anti-CEBiP antiserum.
- transgenic rice cells in which the expression of the CEBiP gene was specifically knocked down by the RNAi method were prepared by the Agrobacterium terminus method.
- a binary vector for transformation was constructed using the Gateway system method.
- CEBiP gene clone was transformed into type III, and the upstream primer (5'-CACCACAGAACAAGGGATGCCCGT-3'Z SEQ ID NO: 14) and the downstream primer (5'-GCTGGATAAACCAGTCATCAAAAT-3'Z SEQ ID NO: 15), KOD- PCR was performed using Plus DNA polymerase (TOYOBO) to amplify a 385 bp CEBiP gene fragment (FIG. 13Z, SEQ ID NO: 13). This was cloned into an entry vector using the pENTR / D-TOPO Cloning kit (Invitrogen) (pENTR-CEBiP-RNAi).
- rice (cultivar: Nipponbare) was transformed by the rice ultra-rapid transformation method (International Publication Number: WO 01/06844).
- Transformed rice cells are selected by transplanting at least four times every 10 days in N6D gellite medium (selection medium) containing carbecillin and hygromycin to create a transformed rice callus line (CEBiP-RNAi line). did.
- PCR was performed using 5'-CACCCTACAGTGGTTACTCCA-3'Z SEQ ID NO: 16), a downstream primer (5'-TCCTATCTAATGAATATTCC-3'Z SEQ ID NO: 17) and KOD-Plus DNA polymerase (TOYOBO).
- the PCR was performed 25 cycles, with one cycle consisting of 10 seconds at 98 ° C, 2 seconds at 45 ° C, and 30 seconds at 74 ° C. After that, electrophoresis was performed in 1.5% agarose, and the amount of a DNA fragment derived from the transcript of the CEBiP gene was confirmed.
- the amount of ubiquitin gene transcript and the amount of transcript derived from the GUS gene fragment in the pANDA-CEBiP-RNAi vector were similarly confirmed.
- the upstream primer (5'-TACCCGCTTCGCGTCGGCAT-3'Z SEQ ID NO: 18), the downstream primer (5'-TGCTTCCGCCAGTGGCGCGA-3'Z SEQ ID NO: 19), and for the ubiquitin gene,
- An upstream primer (5'-CCAGTAAGTCCTCAGCCATGGA-3'Z SEQ ID NO: 20) and a downstream primer (5'-GGACACAATGATTAGGGATCAC-3'Z SEQ ID NO: 21) were used.
- the quantification of the expression level of the CEBiP gene was measured by real-time PCR.
- Samples obtained by reverse transcription using Superscript I were prepared by adding OligodT primer to RNA (250 ng) extracted from cultured cells derived from NT rice virus and CEBiP-RNAi # 3 and # 6 rice calli. This was used as a template for RT-PCR.
- Real-time PCR is performed using two types of primers, LightCycler-FastStart DNA Master SYBR Green I (Roche Diagnostics Japan) and CEBiP;
- the quantitation PCR program uses 1 cycle at 95 ° C for 10 minutes and 45 cycles (95 ° C for 15 seconds, 60 ° C for 5 seconds, and 72 ° C for 10 seconds), and converts the obtained results to the ubiquitin gene transcription product in accordance with Roche's protocol. After the correction, the CEBiP content of each cultured cell was calculated.
- CEBiP protein was not detected in the four lines of CEBiP-RNAi rice cells (# 3, # 4, # 6, and # 11) by the Western Boltting method using the anti-CEBiP ⁇ heron antiserum.
- NT and CEBiP-RNAi # 8 were detected in rice cells (FIG. 14).
- expression of the transcript derived from the CEBiP gene by RT-PCR was not confirmed in four lines of CEBiP-RNAi rice cells, and gene expression was observed in both NT and CEBiP-RNAi # 8 rice cells.
- Example 9 Analysis of reactive oxygen generation in cultured CEBiP-RNAi rice cells by sugar elicitor
- the elicitor was added to the CEBiP-RNAi rice cultured cells, and the cells were treated for 30 minutes or 2 hours. Then, the medium solution 251 was taken, and the active oxygen was measured. As a control, the same treatment was carried out by adding the same amount of distilled water (DW). For measurement of active oxygen, a tube was charged with 251 of the reaction solution, 400 ⁇ l of 50 mM potassium phosphate buffer ( ⁇ , pH 7.9), 251 of 1.1 mM luminol, and 50 ⁇ l of 14 mM potassium ferricyanide. After the mixture was stirred, the chemiluminescence count was measured for 10 seconds using a luminometer (Turner Design TD-20 / 20, Sunnyvale, CA).
- CEBiP-RNAi strains Non-responsiveness was maintained in both CEBiP-RNAi strains. These results strongly suggested that CEBiP is an important protein involved in signal transduction as a receptor that specifically recognizes chitin elicitor.
- oligo array for which a rice full-length cDNA database was also prepared was used (Agilent).
- Cyanine 3 (Cy3) and Cyanine 5 (Cy5) labeled cRNA rice cultured cells of NT and two types of CEBiP-RNAi treated with (GlcNAc) for 2 hours
- CEBiP-RNAi # 6 I In the CEBiP-RNAi # 6 section, 361 genes whose expression level increased and 90 genes whose expression level decreased were identified. In CEBiP_RNAi # 6 cells, 530 (71%) of the 746 genes with increased expression in the (GlcNAc) -NTINT group
- Table 1 shows representative genes among them.
- CEBiP-RNAi cells among the elicitor responsive genes, the CEBiP gene (AK073072), genes related to the shikimate pathway such as Caffeoly-CoA-related genes and shikimate kinase (AK066687), and 1-aminocyclopropane-1-carboxylate oxidase ( AK058296), lignin degradation-related genes such as Laccase (AK103094), and MAPK pathway-related genes lose their elicitor responsiveness. It has been suggested.
- CEBiP is a receptor protein for chitin oligosaccharide elicitor, and was confirmed to be a protein having an important role in elicitor signal transduction.
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PCT/JP2005/003451 WO2005085444A1 (ja) | 2004-03-03 | 2005-03-02 | キチンオリゴ糖エリシター結合タンパク質 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008212101A (ja) * | 2007-03-07 | 2008-09-18 | Meiji Univ | 防御応答制御遺伝子導入植物 |
CN102613197A (zh) * | 2012-03-07 | 2012-08-01 | 海南正业中农高科股份有限公司 | 壳寡糖用于抗早衰的用途 |
CN102613192A (zh) * | 2012-03-07 | 2012-08-01 | 海南正业中农高科股份有限公司 | 壳寡糖用于促进新生枝条短粗壮的用途 |
US8373021B2 (en) | 2005-05-26 | 2013-02-12 | National Institute Of Agrobiological Sciences | Improving disease resistance in plants by introducing transcription factor gene |
CN103340201A (zh) * | 2013-07-26 | 2013-10-09 | 海南正业中农高科股份有限公司 | 壳寡糖水溶液用于促进植物分蘖的用途 |
CN114163549A (zh) * | 2022-01-06 | 2022-03-11 | 苏州乙水茉生物科技有限公司 | 壳寡糖与二价植物疫苗共价偶联体及其制备方法和应用 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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BRPI0715354A2 (pt) * | 2006-08-07 | 2015-06-23 | Univ Missouri | Quinases semelhantes a receptor lysm para melhora da resposta de defesa de plantas contra fungos patogênicos |
CN102405905B (zh) * | 2011-10-28 | 2014-04-16 | 海南正业中农高科股份有限公司 | 一种用于抗西瓜病毒病的壳寡糖组合物及其用途和方法 |
Citations (1)
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WO2003000906A2 (en) * | 2001-06-22 | 2003-01-03 | Syngenta Participations Ag | Plant disease resistance genes |
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JP3440258B2 (ja) * | 1998-06-12 | 2003-08-25 | 独立行政法人農業生物資源研究所 | いもち病抵抗性遺伝子 |
US20110131679A2 (en) * | 2000-04-19 | 2011-06-02 | Thomas La Rosa | Rice Nucleic Acid Molecules and Other Molecules Associated with Plants and Uses Thereof for Plant Improvement |
AU2002341541A1 (en) * | 2001-06-22 | 2003-03-03 | Syngenta Participations Ag | Abiotic stress responsive polynucleotides and polypeptides |
JP2005185101A (ja) * | 2002-05-30 | 2005-07-14 | National Institute Of Agrobiological Sciences | 植物の全長cDNAおよびその利用 |
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2005
- 2005-03-02 WO PCT/JP2005/003451 patent/WO2005085444A1/ja active Application Filing
- 2005-03-02 US US10/591,576 patent/US20070275464A1/en not_active Abandoned
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WO2003000906A2 (en) * | 2001-06-22 | 2003-01-03 | Syngenta Participations Ag | Plant disease resistance genes |
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DATABASE NCBI [online] KIKUCHI S. ET AL: "Oryza sativa (japonica cultivar-group) cDNA clone: J023146H06, full insert sequence.", XP002992465, Database accession no. (AK073032) * |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US8373021B2 (en) | 2005-05-26 | 2013-02-12 | National Institute Of Agrobiological Sciences | Improving disease resistance in plants by introducing transcription factor gene |
JP2008212101A (ja) * | 2007-03-07 | 2008-09-18 | Meiji Univ | 防御応答制御遺伝子導入植物 |
CN102613197A (zh) * | 2012-03-07 | 2012-08-01 | 海南正业中农高科股份有限公司 | 壳寡糖用于抗早衰的用途 |
CN102613192A (zh) * | 2012-03-07 | 2012-08-01 | 海南正业中农高科股份有限公司 | 壳寡糖用于促进新生枝条短粗壮的用途 |
CN102613192B (zh) * | 2012-03-07 | 2014-04-30 | 海南正业中农高科股份有限公司 | 壳寡糖用于促进新生枝条短粗壮的用途 |
CN102613197B (zh) * | 2012-03-07 | 2014-04-30 | 海南正业中农高科股份有限公司 | 壳寡糖用于抗早衰的用途 |
CN103340201A (zh) * | 2013-07-26 | 2013-10-09 | 海南正业中农高科股份有限公司 | 壳寡糖水溶液用于促进植物分蘖的用途 |
CN103340201B (zh) * | 2013-07-26 | 2014-12-17 | 海南正业中农高科股份有限公司 | 壳寡糖水溶液用于促进植物分蘖的用途 |
CN114163549A (zh) * | 2022-01-06 | 2022-03-11 | 苏州乙水茉生物科技有限公司 | 壳寡糖与二价植物疫苗共价偶联体及其制备方法和应用 |
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JPWO2005085444A1 (ja) | 2007-12-13 |
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