WO1999054483A1 - Gene de la dihydrodipicolinate synthase du riz et adn associe - Google Patents
Gene de la dihydrodipicolinate synthase du riz et adn associe Download PDFInfo
- Publication number
- WO1999054483A1 WO1999054483A1 PCT/JP1998/001784 JP9801784W WO9954483A1 WO 1999054483 A1 WO1999054483 A1 WO 1999054483A1 JP 9801784 W JP9801784 W JP 9801784W WO 9954483 A1 WO9954483 A1 WO 9954483A1
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- WIPO (PCT)
- Prior art keywords
- dna
- sequence
- seq
- rice
- gly
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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
- C12N9/88—Lyases (4.)
-
- 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)
- C12N15/8201—Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation
- C12N15/8206—Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation by physical or chemical, i.e. non-biological, means, e.g. electroporation, PEG mediated
- C12N15/8207—Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation by physical or chemical, i.e. non-biological, means, e.g. electroporation, PEG mediated by mechanical means, e.g. microinjection, particle bombardment, silicon whiskers
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- 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)
- C12N15/8201—Methods for introducing genetic material into plant cells, e.g. DNA, RNA, stable or transient incorporation, tissue culture methods adapted for transformation
- C12N15/8209—Selection, visualisation of transformants, reporter constructs, e.g. antibiotic resistance markers
-
- 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
- C12N15/8242—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits
- C12N15/8243—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits involving biosynthetic or metabolic pathways, i.e. metabolic engineering, e.g. nicotine, caffeine
- C12N15/8251—Amino acid content, e.g. synthetic storage proteins, altering amino acid biosynthesis
- C12N15/8254—Tryptophan or lysine
Definitions
- the present invention relates to a rice dihydrodipicolinate synthase gene and a DNA associated with the gene. More specifically, the present invention relates to a novel DNA encoding a dihydrodipicolinate synthase involved in the biosynthetic pathway of lysine in rice plants. The present invention also relates to a DNA encoding a novel protein having dihydrodipicolinate synthase activity. Furthermore, the present invention includes Escherichia coli transformed with the novel DNAs, or plants and seeds transformed with the novel DNAs.
- the present invention includes a novel recombination vector incorporating a novel DNA.
- Cereal seeds such as rice, corn and wheat are important nutrient sources for humans and livestock. However, these seeds are somewhat inferior in nutritional value due to the low content of lysine, one of the essential amino acids. It is desirable to produce new varieties of plants that can produce cereal seeds with high resin content and excellent nutritional value.
- DHDPSj dihydrodipicolinate synthase
- DHDPS a gene encoding DHDPS, that is, the DHDPS gene into a useful plant such as corn, octopus, rapeseed, or soybean, and expressing the function of the gene
- the transgenic plant can be obtained. It has been reported that the content of lysine in the seeds of E. coli is improved (PCT International Publication W095 / 15392, JP-T-Hei 7-504821, and Biotechnology, Volume 13, pages 577 to 582, 1995).
- An object of the present invention is to obtain and provide a rice DHDPS gene from a rice plant. Another object of the present invention is to provide a novel DNA capable of encoding a protein having DHDPS activity of rice DHDPS protein. It is. Still another object of the present invention is to provide a novel DNA capable of encoding a protein having DHDPS activity to provide maize, rice, soybean, wheat, and wheat. It is intended to provide a new transformed variety of a useful plant capable of transforming any useful plant and producing a seed having a high lysine content.
- the obtained cDNA was ⁇ gtl1 f Can be replicated by ligating the ends of the EcoRI cut pieces to phage vectors (commercially available from STRATAGEN) that have been treated with anophore rephosphatase derived from the small intestine of pups.
- the ability to construct a suitable recombinant lambda phage was found based on the results of many trials and errors.
- the amino acid sequence of wheat DHDPS protein described in Japanese Patent Application Laid-Open No. 3-127984 the base sequence ij of the DHDPS gene deduced from this, and the literature "Molecular” & General Genetics J, Vol. 228, pp. 287-293 (1991), and was considered to be suitable as a primer for PCR by referring to the nucleotide sequence of the DHDPS gene of corn.
- the present inventors chemically synthesized a first oligonucleotide consisting of 25 nucleotides and a second oligonucleotide consisting of 24 nucleotides. It was produced by
- the first and second oligonucleotides can function as required primers (complementary DNA) in the PCR method, and the rice cDNA library described above is used. It was confirmed that the cDNA in the library can be used as a template, and that a portion of the cDNA derived from the rice DHDPS gene can be amplified. Then, from the PCR amplification reaction, rice DHDPS gene The amplification product of a portion of the original cDNA was successfully recovered as probe DNA.
- the extracted DNA fragment is used for DNA base sequence analysis, whereby the base of the DNA sequence contained in this DNA fragment and determined to correspond to the rice DHD PS gene is determined.
- the sequence was confirmed to have the nucleotide sequence of SEQ ID NO: 1 in the sequence listing described below.
- DNA having the nucleotide sequence described in SEQ ID NO: 1 in the sequence listing was recognized as a novel DNA sequence not described in any literature. Was done.
- the protein encoded by the DNA having the nucleotide sequence of SEQ ID NO: 1 in the Sequence Listing was identified as the protein having the amino acid sequence of SEQ ID NO: 2 in the Sequence Listing.
- the protein is recognized as a protein that constitutes DHDPS of rice.
- the first DNA according to the present invention can be a DNA having the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing.
- the first DNA of the present invention is a rice DHDPS tamper. DNA that encodes proteins. As described above, this DNA was obtained from a rice cDNA library by a genetic engineering technique in conducting the research of the present inventors. However, since the nucleotide sequence of the DNA has been clarified in the present invention, it can also be obtained by chemical synthesis from a nucleotide by referring to the nucleotide sequence of SEQ ID NO: 1 in the sequence listing. In addition, the ability to prepare and use a synthetic nucleotide as a probe with reference to the above-described nucleotide sequence, or a known method using the synthesized oligonucleotide as a primer is used.
- the DNA of the present invention is obtained by the DNA library of rice chromosome, the method of polymerase chain reaction (PCR) or hybridization. You can also do it.
- RNA from various tissues of rice (Oriza sativa), such as foliage, roots, potatoes, and preferably green foliage, in a conventional manner: Protein from extracted total RNA Do after which contaminants excluding, by the this to purify poly (a) + RNA by passing the charge Hamaca ram is Ranio re Gore dT cellulose Ru is possible to get a mRNA rice c
- commercially available cDNA is synthesized from mRNA by using a synthetic kit. The synthesized cDNA is incorporated into a phage vector, such as a ⁇ gt11 vector or a ⁇ p vector, to obtain a large number of recombinant phages.
- the large number of recombinant phages thus obtained as plaques for lysis of host Escherichia coli are a variety of phages that contain all of the cDNA from rice, rice and rice. It can be used as a cDNA library.
- the known nucleotide sequence of the wheat DHDPS gene for example, the DNA sequence described in Japanese Patent Application Laid-Open No. 3-127984
- the known nucleotide sequence of the corn DHDPS gene for example, ⁇ Molecular & General Genetics J 228, 287-
- the present inventors have found that there is a nucleotide sequence which is commonly conserved between these DNA sequences and the DNA sequence described on page 293). With reference to the common base sequence thus found, the present inventors have proposed two types of oligonucleotides (the oligonucleotides of SEQ ID NOS: 3 and 4 in the sequence listing below). Reotide) as a primer (complementary DNA) for the PCR method by chemical synthesis. (3) Preparation of probe DNA
- the PCR cDNA method encodes a portion of the rice DHDPS gene as a template in a rice cDNA library. Amplify the DNA.
- the amplification product of a DNA fragment which is a part of the DNA sequence corresponding to the rice DHDPS gene is collected from the amplification reaction solution as probe DNA.
- the above probe DNA is used as a screening material.
- Large plaques-Several black blocks consisting of a recombinant phage incorporating a DNA sequence that corresponds entirely to the rice DHDPS gene of interest by the hybridisation method Thus, a DNA fragment containing the target DNA sequence corresponding to the DNA of the rice DHDPS gene can be collected in the form of a recombinant phage incorporating the DNA fragment c In other words, more specifically, the plaque high W
- the DNA fragment contains a DNA sequence corresponding to the rice DHDPS gene.
- the inserted DNA fragment determined to contain the DNA system ij corresponding to the DHDPS gene of rice is contained in the phage DNA of the collected phage selected as described above.
- the DNA obtained by excision from the phage as a DNA fragment containing the DNA sequence corresponding to the DHDPS gene of rice 20 thereinto was collected by the plasmid vector p. Insert and ligate into the EcoRI cleavage site of Bluescript II SK (+) to construct a recombinant plasmid vector.
- the recombinant plasmid vector thus constructed is used to transform E. coli XLl-Blue MRF '. Escherichia coli transformation thus obtained
- the above-described recombinant plasmid carrying a DNA fragment containing a DNA sequence corresponding to the rice DHDPS gene can be cloned. Therefore, a DNA fragment containing the DNA sequence corresponding to the rice DHDPS gene can be obtained.
- a DNA fragment containing the DNA sequence corresponding to the gene is cut out from the cloned recombinant plasmid with an appropriate restriction enzyme.
- the cut DNA fragment is treated with a commercially available nucleotide sequencing kit, the nucleotide sequence of the DNA containing the DNA sequence corresponding to the rice DHDPS gene can be determined.
- the nucleotide sequence of the DNA sequence having the nucleotide sequence thus determined and encoding rice DHDPS is described in SEQ ID NO: 1 in the sequence listing below.
- the DNA sequence of the first invention obtained as described above or a DNA fragment containing the DNA sequence is used as a probe, the DNA sequence can be obtained from the rice chromosome itself by a conventional method.
- DHDPS gene DNA can be obtained.
- the DNA of the DHDPS gene obtained from the rice chromosome itself is expected to contain intron.
- Such DNA fragmented by intron is recognized as being included in the DNA of the first present invention as long as it is a DNA encoding rice DHDPS.
- it corresponds to the rice DHDPS gene obtained in Example 1 described below and having the nucleotide sequence of SEQ ID NO: 1 in the sequence listing.
- the DNA fragment containing the corresponding DNA sequence is pBluescriptSK
- Escherichia coli XLl-Blue MRF 'transformed by the introduction of the recombinant plasmid obtained in this way is transformed into Escherichia coli DAP8-l.
- the first DNA of the present invention is to obtain a large amount of rice DHDPS protein by chemical synthesis by using the nucleotide sequence of the DNA elucidated by the present invention as a guideline. This method is useful in that it allows for the development of DHDPS protein in rice, and contributes to the advancement of enzymological studies on the DHDPS protein in rice.
- the first DNA sequence according to the present invention can be obtained by ligating its end with Eco I linker and then using a commercially available plasmid vector.
- a recombinant vector can be constructed by inserting it into the NcoI cleavage site downstream of the Eac promoter of pTVll8N (Takara Shuzo, Japan). Escherichia coli transformed with the recombinant vector thus constructed, when cultured, produces a protein having DHDPS activity in the cells.
- the DNA of the first invention of the present invention can be a DNA encoding a protein having DHDPS activity even after a part or a part of the base sequence is modified.
- the DNA according to the first invention is obtained by modifying one or more bases in its base sequence, for example, 1, 2 or 3 to 10 bases to another base. Can also possess the ability to code for proteins with DHD PS activity.
- a DNA is provided which encodes a protein having dihydrodipicolinate synthase activity.
- the DNA according to the second present invention is a DNA modified from the DNA according to the first present invention, and the DNA of the second present invention can be obtained by, for example, site-directed mutagenesis.
- a cell containing the DNA fragment containing the DNA of the first invention of the present invention is subjected to a mutation treatment, and the mutated cell is subjected to, for example, a DNA having the base sequence of SEQ ID NO: 1 in the sequence listing.
- the “stringent conditions” used herein mean that a so-called specific hybrid to the first DNA of the present invention is formed, and a non-specific hybrid is formed. This condition is difficult to specify numerically, but one example is that two nucleic acids with high homology have high homology. Allow, for example, DNAs with 98% or more homology to hybridize, but with lower homology Conditions that do not allow different nucleic acids to hybridize are listed.
- the DNA according to the second present invention has, as a specific example, a nucleotide sequence partially different from the nucleotide sequence described in SEQ ID NO: 1 in the sequence listing, DNA which shows high homology to the above-mentioned base sequence, and which is hybridized to DNA having the base sequence of SEQ ID NO: 1 under stringent conditions. It can be redisinated, and can be a DNA encoding a tanno-protein having dihydrodipicolinate synthase activity.
- DNA according to the second present invention examples include a DNA sequence prepared by the method described in Example 2 described later and named as modified DNA-158N in Example 2, and There is a DNA sequence created by the method described in Example 3 below and designated as modified DNA-166A in Example 3:
- the DNA sequence designated as the modified DNA-158N is a DNA having the nucleotide sequence of SEQ ID NO: 5 in the sequence listing below: It has the nucleotide sequence of SEQ ID NO: 1 in the sequence listing below.
- One of the 473rd base A (adenine) in the 472nd, 473th and 474th AAC roosters (codon coding for asparagine) in the first present invention DNA is replaced with T ( (Thymine) DNA modified so that it is replaced with one and the sequence ij ATC (codon encoding isoleucine) is located at positions 472 to 474 of the nucleotide sequence.
- T (Thymine) DNA modified so that it is replaced with one
- the sequence ij ATC codon encoding isoleucine
- the protein encoded by this modified DNA-158N sequence has the amino acid sequence described in SEQ ID NO: 6 in the sequence listing, and has DHDPS activity.
- the above-mentioned modified DNA-166A sequence is a DNA having the nucleotide sequence of SEQ ID NO: 7 in the sequence listing-this is the first DNA of the present invention having the nucleotide sequence of SEQ ID NO: 1.
- Still another example of the modified DNA according to the second invention is a nucleotide sequence represented by SEQ ID NO: 1 in the sequence listing, wherein adenine at position 473 is substituted with thymine and cytosine at position 497 is substituted with thymine. It is a DNA sequence having a base sequence formed by substituting with a min. A protein having an amino acid sequence formed by substituting asparagine at position 158 with isoleucine and substituting alanine at position 166 with amino acid in the amino acid sequence, wherein the protein is dihydrodibicoli; A protein having a native synthase activity is coded.
- methods for modifying a nucleotide sequence in a partial region of a DNA sequence include the method described in the Kunkel method, “Methods in Enzymology”, Vol. 154, No. 367, and the oligonucleotide direct dual method.
- Kunkel method “Methods in Enzymology”, Vol. 154, No. 367
- oligonucleotide direct dual method The Member method and other methods are known.
- the original purpose of the present invention is to create a new cultivar that has been transformed to produce seeds having a high lysine content.
- DHDPS whose enzyme activity has been modified so that the DHDPS involved in the enzyme are not subject to the feed-back inhibition of the enzyme activity by lysine as a biosynthetic product.
- Quality DNA encoding DHDPS is required.
- a novel modified DNA capable of encoding a novel DHDPS modified so as to eliminate the enzyme's susceptibility to phyto-knock inhibition by lysine is provided by the first present invention.
- the inventors first studied with the aim of producing from the DNA of the present invention: As a result, an improved method of the known Kunkel method and a method of the Oligonucleotide dual-direct dual amber method were obtained.
- the first base of the present invention which encodes rice DHDPS by combining the improved method with The present inventors have found that one or two or more bases in a partial region of the sequence can be replaced with another base.
- the modified DNA obtained by replacing cytosine (C) with thymine (T) has been modified to have an enzymatic activity that is not affected by feedstock inhibition by lysine.
- Novel tannins that are able to maintain DHDPS activity Click quality this time the expected specific wearing virtual that it is co-Dodeki Ruhazu to give.
- a DNA fragment containing the DNA sequence corresponding to the rice DHDPS gene [that is, the DNA fragment cut out from the ⁇ phage as described above, ie, the DNA sequence of SEQ ID NO: 1 in the sequence listing (this is In the following, a DNA fragment containing DHDPS-DNA-1143) was added to the DNA ligation kit between the EcoRI and SacI cleavage sites of the plasmid vector p Bluescript II SK (+).
- Recombinant plasmid vector hereinafter referred to as pDAP8-1
- pDAP8-1 Recombinant plasmid vector
- the novel modified DNA for such a purpose is used as a primer that can be appropriately used to prepare the above-mentioned starting material, recombinant plasmid vector pDAP8-1 according to the PCR method.
- 5 types of primers namely, primer No. 3 consisting of an oligonucleotide having the nucleotide sequence shown in SEQ ID NO: 9 in the sequence listing below, and base sequence shown in SEQ ID NO: 10
- Primer No. 4 consisting of the oligonucleotide represented by SEQ ID NO: 11
- primer FW-1 consisting of the oligonucleotide represented by the nucleotide sequence represented by SEQ ID NO: 11, and primer No.
- a primer RV-1 consisting of an oligonucleotide having the nucleotide sequence of SEQ ID NO: 13 and a primer BS KPN-1 consisting of an oligonucleotide having the nucleotide sequence of SEQ ID NO: 13
- the present inventor has prepared) by chemical synthesis.
- SEQ ID No. 5 which is a specific example of the modified DNA according to the present invention, that is, the modified DNA-158N sequence described above.
- SEQ ID NO: 7 the DNA fragment containing the modified DNA-166A sequence
- Both the DNA according to the first invention, the modified DNA-158N sequence, and the modified DNA-166A sequence are incorporated into a recombinant vector to produce a plant described in Example 4 or 5 described below.
- the gene When introduced into a rice plant by the method for introducing a foreign gene described above, the gene could be expressed in the transgenic transgenic plant.
- the transgenic rice plant transformed with the modified DNA-158N sequence or modified DNA-166A sequence according to the first DNA of the present invention or the second DNA of the present invention is a lysine. It was confirmed that rice plant cells or rice seeds with an increased content could be produced.
- the first DNA of the present invention consisting of 1143 bases represented by SEQ ID NO: 1 in the sequence listing, that is, the DNA fragment containing the above DHDPS-DNA-1143 sequence was converted into a DNA ligion kit.
- the above-mentioned recombinant plasmid pDAP8-1 is obtained.
- the vector pDAP8-1 is introduced into Escherichia coli XLI-Blue MRF ', and the transformed Escherichia coli thus obtained is propagated.
- a large amount of the recombinant plasmid vector pDAP8-l is obtained from the grown E. coli cells by extraction in a conventional manner. Since this vector contains a large amount of copies of the DNA fragment containing the DHDPS-DNA-1143 sequence, it means that the first DNA of the present invention has been cloned.
- Primer ⁇ ⁇ 3 (a) Primer having the base sequence described in SEQ ID NO: 9 in the sequence listing and described below):
- Primer No. 4 (a primer described in SEQ ID NO: 10 in the sequence listing and having the following base sequence):
- Primer FW-1 (a primer having a base sequence described in SEQ ID NO: 11 in the sequence listing and having the following base sequence):
- Primer RV-1 (a primer described in SEQ ID NO: 12 in the sequence listing and having the following base sequence):
- Primer BSKPN-1 (e) Primer BSKPN-1 (a primer having the base sequence described in SEQ ID NO: 13 in the sequence listing and described below):
- the first step of the PCR method is to carry out two reactions, that is, the following reactions (A) and (B).
- the reaction (A) is performed by using the above-mentioned recombinant plasmid pDAP8-1 used as a template and a primer as a primer.
- primers FW-1 synthetic oligonucleotide of SEQ ID NO: 11
- primer ⁇ ⁇ ⁇ 3 synthetic oligonucleotide of SEQ ID NO: 9; 5 ′ - 15 from the end 17 th the can Ru
- alterations portion ATC of GAT force DNA-158N sequence conventional reaction solution for PCR methods (Tris-HCl, MgCl 2, KC1,
- DNA fragment-A a DNA fragment having a base sequence in a certain region of the above-mentioned DHDPS-DNA-1143 sequence (referred to as DNA fragment-A) was subjected to the amplification reaction.
- the primer RV-1 synthetic oligonucleotide of SEQ ID NO: 12
- the primer BS KPN-1 synthetic oligonucleotide of system IJ No. 13
- the amplification reaction is performed.
- the above amplification reaction by the PCR method can be performed using a commercially available PCR reaction device.
- the amplification reaction solution of the above reaction (A) is fractionated by low melting point agarose electrophoresis, and a 480 bp (base pair) DNA fragment-A as an amplification product is obtained. Cut the containing band from the agarose gel.
- the amplification reaction solution of the above reaction (B) was fractionated by low-melting point agarose gel electrophoresis, and the DNA fragment-B of 1200 bp (base pair) was obtained from the agarose gel force. the bus down de, including the cut c
- the two gel slices were purified using a DNA purification kit, for example, Genclean II kit (Funakoshi) to obtain a purified DNA fragment-A and a DNA fragment-A.
- Genclean II kit Fermoshi
- a step of preparing a DNA fragment having a sequence length of 1200 bp containing an extension having a KpnI cleavage site at the end and an extension having a Sacl cleavage site at the 3′-end is performed.
- a purified product of DNA fragment-A (sequence length 480 bp), which is an amplification product of the above-mentioned reaction (A), which is used as a template, and an amplification product of the reaction (B)
- a purified product of a certain DNA fragment-B (sequence length: 1200 bp), the primer RV-1 (synthetic oligonucleotide of SEQ ID NO: 12), and the primer FW-1 (SEQ ID NO: 11) and Naruo re Gore j click Reochi de), in addition to the usual amplification reaction solution for PCR methods (Tris-HCl, containing MgCl 2, KC1, 4 kinds of d NTP, and La Taq DNA poly main hydrolase), Next, an amplification reaction is performed.
- DNA fragment-C the desired DNA fragment having a sequence length of 1200 bp (referred to as DNA fragment-C) was contained in the agarose gel. Cut out the tip.
- the gel slice is purified using a DNA purification kit, for example, Genclean II kit (Funakoshi) to obtain a purified DNA fragment-C.
- This DNA fragment-C contains a base sequence corresponding to the modified DNA-158N fragment according to the second aspect of the present invention therein, and has a KpnI cleavage site at the 5'-end of the DNA sequence. And a structure containing an extension with a Sac I cleavage site at the 3'-end
- the extension at the 5′- and 3′-ends of the above DNA fragment-C is first treated with the restriction enzymes KpnI and SacI.
- plasmid vector p Bluescript II SK (+) was treated with the restriction enzymes KpnI and SacI to obtain a 5'-side -end with a KpnI cleavage site and 3 sites. 'Protect the truncated plasmid with a Sac I cleavage site at the other end on the-side (hereinafter referred to as p Bluescript II SK (+) -Kpn I-Sac I- truncated plasmid).
- This Kpn I-Sac I-truncated plasmid was mixed with the DNA fragment sample containing the DNA-158N sequence described above, and then subjected to a ligation reaction with a DNA ligation kit to obtain modified DNA-158N.
- array pairs conversion example Breakfast La scan Mi-de-you-containing organic (in the following, p Bluescript- DNA-158N referred to as a plus Mi de) recombinant Department of c this that can make a La scan Mi de E. coli XLl -Blue MRF 'for transformation, and the resulting transformed E. coli Incubate and grow in liquid medium.
- coli cells grown in large quantities contain the recombinant plasmid, ie, a copy of the p-Bluescript-DNA-158N plasmid. In this way, the modified DNA-158N sequence can be cloned.
- C from the E. coli cells in culture take to extract the plus Mi-de-containing by Ri modified DNA- 158N array to a conventional method
- the plasmid containing the modified DNA-158N sequence obtained in the above section (4) is digested by treatment with the restriction enzymes XbaI and SacI.
- a digestion reaction solution containing the DNA fragment to be obtained can be obtained.
- the digestion reaction solution is fractionated by low-melting-point agarose electrophoresis, and a band containing the DNA fragment is cut out from agarose gel.
- the excised agarose gel piece is dissolved in a TE buffer, and the obtained solution is extracted with phenol.
- the DNA fragment is recovered in a phenol extract:
- the phenol extract containing the above DNA fragment was mixed with a 3M sodium acetate aqueous solution and ethanol, and the mixture was left at -20 ° C for about 6 hours, and further mixed.
- the DNA fragment precipitates.
- this is dried under reduced pressure, a DNA fragment containing the desired modified DNA-158N sequence is obtained. Is obtained as a powder.
- the powder of the DNA fragment containing the modified DNA-158N sequence is soluble in water.
- the method can be carried out by the same procedure as the method described above for preparing a DNA fragment containing the modified DNA-158N sequence. That is, a suitable method for preparing a DNA fragment containing the modified DNA-166A sequence is the same as that described in section (1) of the method for preparing a DNA fragment containing the modified DNA-158N sequence.
- the recombinant vector pDAP8-1 containing the first DNA of the present invention that is, DHDPS-DNA-1143
- DHDPS-DNA-1143 is introduced into E. coli XLI-Blue MRF to grow E. coli. It starts with the cloning process power that is based on this.
- the template p DAP8-1 to be used as a template, the primer FW-1 synthesized as an oligonucleotide, and the primer No. .4 synthetic oligonucleotide of SEQ ID NO: 10, wherein the 18th to 20th TAC from the 5'-end can induce the modified GTA of the modified DNA-166A sequence
- the same method as used in the reaction (A) described in section (3) of the method for preparing a DNA fragment containing the DNA-158N sequence is added to the usual reaction solution for the PCR method, followed by an amplification reaction. The process will be implemented. By the amplification reaction at this time, a base in a certain region of the DHDPS-DNA-1143 sequence was determined.
- DNA fragment-D A DNA fragment having the sequence (referred to as DNA fragment-D) is generated.
- the step consisting of carrying out the reaction (B) of the PCR method is performed.
- the DNA fragment-B is obtained as an amplification product.
- the amplification reaction solution containing the DNA fragment-D generated by the reaction (A) using the primer FW-1 and the primer No. 4 is fractionated by low melting point agarose electrophoresis. In this way, a band containing the 480 bp DNA fragment-D as an amplification product is cut out from the agarose gel.
- the amplified reaction solution containing the DNA fragment-B generated by the reaction (B) was fractionated by low-melting point agarose gel electrophoresis, and the band containing the 1200 bp DNA fragment-B was subjected to agarose gel electrophoresis.
- a purified DNA fragment-D and a purified DNA fragment-B can be recovered.
- a nucleotide sequence obtained by replacing the 497th cytosine in the nucleotide sequence shown in SEQ ID NO: 1 in the sequence listing with thymine is used. It contains a DNA sequence (ie, a DNA sequence ij corresponding to the modified DNA-166A sequence having the nucleotide sequence of SEQ ID NO: 7) therein and has a KpnI cleavage site at the 5'-end of the DNA sequence. Cleavage of a 1200 bp DNA fragment containing an extension and a SacI cleavage site at the 3'-end A process for producing pieces is performed.
- the purified DNA fragment-D (sequence length: 480 bp) used as a template
- the purified DNA fragment-B (sequence length: 1200 bp)
- the primer RV- 1 and primer FW-1 are added to an amplification reaction solution for a PCR method, and then an amplification reaction is performed.
- the reaction solution is fractionated by low-melting point agarose electrophoresis. From the agarose gel, a band containing a desired DNA fragment having a sequence length of 1200 bp (referred to as DNA fragment-E) is cut out.
- the gel slice is purified using a DNA purification kit to obtain a purified DNA fragment-E.
- This DNA fragment-E contains a base sequence corresponding to the second modified DNA-166A sequence according to the second invention inside and an extended portion having a KpnI cleavage site at the 5′-end of the DNA sequence. And an extended portion having a SacI cleavage site at the 3'-end.
- DNA fragment-E Using this DNA fragment-E, a DNA fragment containing the desired modified DNA-166A system ij (the second example of the modified DNA according to the second aspect of the present invention) is obtained. To do so, the DNA fragment-E is treated with the restriction enzymes KpnI and SacI. As a result, a DNA fragment containing an extended portion having a SacI cleavage site on the 3′-side and a modified DNA-166A sequence IJ starting from ATG on the 5 ′ side is cut out from the DNA fragment-E. .
- a sample of a DNA fragment containing a DNA sequence corresponding to the modified DNA-166A sequence is obtained.
- This DNA Using a DNA ligation kit and the same procedure as described in (4) of the method for preparing a DNA fragment containing the modified DNA-158N sequence, the sample was transformed into a plasmid vector pBluescript. By ligating with IISK (+), transforming Escherichia coli XLl-Blue MRF 'with the obtained recombinant vector, and further growing it, cloned cells can be obtained.
- a plasmid containing the thus cloned modified DNA-166A sequence is recovered from E. coli cells.
- the plasmid is treated by the same procedure as described in (5) of the method for producing a DNA fragment containing the modified DNA-158N sequence.
- a DNA fragment containing the desired modified DNA-166A sequence can be obtained as a 1143 bp DNA fragment in the form of a water-soluble powder.
- the DNA fragment containing the modified DNA-158N sequence and the DNA fragment containing the modified DNA-166A sequence according to the second invention use genetic engineering techniques. Made by the method. However, it can also be produced by a conventionally known polynucleotide chemical synthesis method with reference to the nucleotide sequences shown in SEQ ID NO: 5 and SEQ ID NO: 7 in the sequence listing:
- the DNA of the first invention may be 473rd or 497th. It is possible to create another modified DNA having a base sequence formed by substituting a base at a different position from the second position with another base.
- both the novel DNA encoding the DHDPS according to the first invention and the novel modified DNA encoding the DHDPS according to the second invention can be used in the recombinant vector. It has been found that they can be introduced into plants after integration by, and that they can be expressed in plants.
- the first invention of the present invention which encodes rice dihydrodipicolinate synthase is provided.
- Plant cells transformed with a recombinant vector carrying the DNA of the present invention, which encodes a DNA or a protein having a dihydrodipicolinate synthase activity are introduced.
- a transgenic plant characterized in that the introduced DNA is capable of expressing the introduced DNA.
- introduction of the DNA according to the first or second aspect of the present invention is provided.
- the recombinant vector carrying the DNA of the first present invention which encodes rice dihydrodipicolinate synthase, is introduced into plant cells.
- a transformed plant obtained by the above-mentioned method and capable of expressing the DNA is cultured, and the seeds are collected from a plant that is fruited by the culture. Transgenic plant seeds are provided.
- a recombinant vector carrying a DNA according to the second aspect of the present invention which encodes a protein having a dihydrodipicolinate synthase activity, is introduced into plant cells.
- the transformed plant obtained thereby and capable of expressing the DNA is cultured, and the seed is a seed collected from a fruited plant by the culture.
- the seed of the transformed plant is provided.
- the base site of SEQ ID NO: 1 in the sequence listing is added to the cleavage site of the plasmid pBluescript II SK (+) by the restriction enzyme EcoRI.
- a recombinant DNA fragment comprising a DNA fragment containing a DNA sequence is ligated by a DNA ligation kit to form a recombinant plasmid, and the strength of the plasmid is ampicillin.
- Transformed Escherichia coli which is characterized by being able to grow stably even in the presence of E. coli, is provided as a novel microorganism.
- the sixth transformed Escherichia coli according to the present invention is a coliform bacterium DAP8-1 deposited with the Institute of Biotechnology and Industrial Technology, National Institute of Advanced Industrial Science and Technology under the deposit number FERM BP-6310 under the terms of the Budapest Treaty in Japan. It can be.
- the types of plants that can be transformed are diverse.
- the method of introducing the DNA of the present invention as a foreign gene into a plant for transformation of the plant may be any of various conventionally known biotechnological techniques performed for the purpose. it can.
- Example 4 The method which can be suitably carried out to introduce the DNA of the first invention or the DNA of the second invention as a foreign gene into a rice plant and is exemplified in Example 4 described below is summarized below. Will be described.
- the known plasmid pBI221 (Clontech, Inc.) containing the 35S promoter, the NOS terminator, and the ampicillin resistance gene of the previously known force renewer mosaiquino-inores Is treated with the restriction enzymes XbaI and SacI in a buffer, it is cleaved at the Xbal cleavage site downstream of the 35S promoter and SacI upstream of the NOS terminator. An approximately 3.8 kb vector DNA fragment cut at the cleavage site is obtained.
- the aqueous solution of the vector DNA fragment is mixed with the aqueous solution of the DNA of the present invention, and the mixture is treated with a DNA ligation kit to perform a ligation reaction. According to this, a recombinant vector in which the DNA of the present invention is inserted and ligated between one region of the 35S promoter and one region of the NOS terminator of the vector DNA fragment is obtained.
- the resulting recombinant vector is introduced into E. coli XL1-Blue MRF 'to obtain transformed E. coli.
- the transformed E. coli thus obtained is inoculated and cultured on a medium containing the antibiotic ampicillin to obtain several ampicillin-resistant E. coli colonies. These colonies are further separately grown in a medium containing ampicillin.
- Recover plasmid from ampicillin-resistant E. coli grown on each colony contains various plasmids in which the orientation of the inserted DNA is different.
- the plasmid recovered for each colony was digested with the restriction enzymes XbaI and SacI, and digestion reactions containing various DNA fragments cut out were subjected to agarose gel electrophoresis. Analysis of the size and nucleotide sequence of the NA fragment revealed that the DNA of the present invention was inserted and ligated in the normal direction downstream of the 35S promoter of the recombinant plasmid (approximately 4.9 kb). Size) can be selected.
- vector pDAP The recombinant plasmid into which the second modified DNA-158N fragment of the present invention has been normally inserted and ligated
- vector pl66A The recombinant plasmid into which the second modified DNA-166A fragment of the present invention has been successfully inserted and ligated.
- vector pl66A The recombinant plasmid into which the second modified DNA-166A fragment of the present invention has been successfully inserted and ligated.
- These vectors are both contain the DNA fragment and the 35S promoter region and NOS ter Mi discriminator one region and ⁇ emissions Pishi Li down resistance gene of the present invention (Am r).
- the rice hulls are removed from the mature rice seeds, and the obtained rice seeds with hulls are sterilized with an ethanol solution, then sterilized with a dilute aqueous solution of sodium hypochlorite, and further sterilized with water. Wash.
- whiskers fine needles made of potassium titanate are placed in a small tube-shaped container and sterilized with ethanol. Complete removal of the ethanol by evaporation: the tube containing the whiskers thus sterilized Put sterile water in the tube-shaped container for washing, and remove the washing solution from the container by centrifugation. Add the R2 liquid medium to the tubular container containing the washed whiskers to obtain a suspension with low force.
- the recombinant vector prepared as described in (1) above, into which the DNA of the present invention has been normally inserted and ligated (that is, the vector p DAP, vector pl58N, or vector p described above) 166A) is dissolved in TE buffer to prepare a vector solution.
- the above-described callus having a size of 1 mm or less is charged into the tubular container containing the whisker suspension.
- PCVlml of callus cell volume ⁇ 100mg. Further, the mixture in the container is agitated and then centrifuged. When the supernatant is discarded, a mixture of the rice callus cells and the yeast power is obtained as a precipitate.
- the recombinant vector containing the DNA of the present invention ie, vector pDAP, vector pl58N, or vector p
- the recombinant vector containing the DNA of the present invention was precipitated in the above-mentioned tube-like container by the mixture of the above-described callus cell and viscous force.
- 166A a solution of a known plasmid p35SC-SS containing a gene resistant to the herbicide phosphinothricin as a selectable marker.
- Shake In this manner, the canolas cells and the viscous force, the recombinant vector containing the DNA of the present invention, and the plasmid Obtain a homogeneous mixture with Midvector p35SC-SS. A more homogenous mixture is obtained by repeatedly subjecting this mixture to centrifugation and shaking.
- a homogeneous mixture of callus cells, whiskers, a recombinant vector containing the DNA of the present invention, and a plasmid vector p35SC-SS prepared as described in (4) above was prepared. Treat by sonication.
- the ultrasonic wave used can have a frequency of 10-60 KHz, and the irradiation intensity can be 0:! ⁇ LW / cm 2 .
- the recombinant vector containing the DNA of the present invention and a plastic for one selection marker can be obtained with the aid of the physical action and ultrasonic force of the ultrasonic wave.
- Smidvector can be introduced by invading the callus cells.
- the mixture sonicated as described above is washed with R2 liquid medium, and the washed mixture is centrifuged to separate callus cells from the force of the virus.
- the isolated callus cells are transformed cells that contain the above-mentioned plasmid vector introduced therein.
- Plasmid vector-containing callus cells are placed in a medium for plant cell culture in which sucrose and plant hormones 2,4-PA are added to R2 medium, and light of 1500 to 2000 lux is applied. With shaking at 27-29 ° C while irradiating for 15-20 hours per day. You. As a result, callus cells undergo cell division and multiply.
- the resulting suspension of split plant cells is transferred to N6 medium with sucrose, 2,4-PA, gellite and the herbicide phosphinosulincin. Spread evenly on the selection medium (semi-solid) to which is added.
- the former transformed cells were cultured in N6 medium on sucrose, 2,4-PA, gellite, and AEC, which is an analog of lysine (i.e., S- (2-amido).
- Transplanted cells are illuminated with 1800 to 2,000 lux of light for 15 to 16 hours per day, 27 to 28. Cultivate in C for 25-30 days.
- Transformed plant cells containing the DNA of the present invention in a sufficiently effective amount as a foreign gene can be used as a cell growth inhibitor in a medium.
- AEC is resistant to AEC even if it exists and can grow.
- the AEC-resistant cultured plant cells re-selected as described above were prepared by adding sucrose, benzyladenine, naphthalene acetic acid, and gellite as plant hormones to an MS medium for plant tissue culture. Transfer to the added differentiation medium for plant regeneration
- the transplanted cells are cultured at 27-28 ° C for 25-30 days while irradiating with 1800-2000 norex light for 15-16 hours per day. In this way, shoots and roots can be regenerated from the cultured transformed plant cells by differentiation.
- the sprouts are transplanted to an acclimatization medium obtained by adding sucrose and gellite to an MS medium.
- the plants are grown at 27-28 ° C for 18-20 days while irradiating with 1800-2000 Norex light for 15-16 hours per day.
- transformed plants can be regenerated-the plants obtained in this way can grow longer if they are transplanted to soil in a greenhouse and cultivated under normal conditions. 3 to 6 months of cultivation to produce rice seeds
- the green rice from the transformed rice plant regenerated as above Collect the leaves.
- the collected leaves are frozen with liquid nitrogen and then crushed.
- DNA is extracted from the crushed leaves according to the method of J. Sambrook et al. (Molecular Cloning, 2nd edition, described in Cold Spring Habor Laboratory Press, 1989).
- an oligonucleotide having the nucleotide sequence shown in SEQ ID NO: 14 in the sequence listing below and an oligonucleotide having the nucleotide sequence shown in SEQ ID NO: 15 are chemically synthesized, Used for primer.
- a known PCR method was used. Amplify the DNA.
- the obtained amplification reaction solution was fractionated by agarose electrophoresis according to a conventional method, and introduced into various DNA fractions of the DNA extracted from the regenerated rice plant. Take a gel band containing a DNA fragment corresponding to the DNA of the foreign gene.
- Plants into which the DNA of the present invention can be introduced are not particularly limited, and include, for example, rice, maize, wheat, oats, and other monocotyledonous plants, and tanococcus And dicotyledonous plants such as soybeans, soybeans, potatoes, tomatoes, knotweed, cucumber, and lettuce.
- the cultured cells used for the DNA introduction of the present invention may be prepared from any explant derived from a plant, for example, from the scutellum, growth point, pollen, anther, leaf blade, stem, petiole, and root Explants can be used.
- explants described above are used as a medium for forming a callus, for example, an MS medium (Murashige et al., "Physiologia Plantarum J, 1962, Vol. 15, pp. 473-497") or an R2 medium (Ojima et al., "Plant and Cell Physiologyj, 1973, vol. 14, p. 1113-1121, is an N6 medium (such as Chu et al., 1978, “InPro Symp. Plant Tissue Culture, Science Press Peking", p. 43-50).
- a plant tissue culture medium containing an inorganic salt component and vitamins as components for example, 2,4-PA (2,4-dichlorophenoxyacetic acid) 0.
- ⁇ 5mg / liter and as a carbon source, for example, Sucrose 10-60g / Litthorn, Gel Light; It is convenient to introduce the DNA of the present invention into cultured cells obtained by placing the cells on a medium supplemented with ⁇ 5 g / litre and culturing them.
- the plant cells to which the DNA of the present invention is introduced include, for example, dedifferentiated cultured cells such as callus and suspension cells or cultured cells such as somatic embryos, shoot primordia, or plant tissues such as leaves
- dedifferentiated cultured cells such as callus and suspension cells
- cultured cells such as somatic embryos, shoot primordia, or plant tissues such as leaves
- they are virulent cells and suspension cells made from cells such as, roots, stems, embryos, and growing points.
- the culture period until the cultured cells for introducing the DNA of the present invention are obtained is particularly limited. It is not something. However, since it is necessary to regenerate the transformed plant, it is possible to regenerate the plant from the cultured cell, that is, the plant cell has the ability to regenerate the plant. It is important to use cultured cells obtained during the period.
- the cell culture for the introduction of the DNA of the present invention if a cell culture that hold plant regeneration capacity, it may also be cultured by suspending the cells in a liquid medium les, c
- a recombinant vector in which the DNA of the present invention has been incorporated into an expression vector.
- the recombinant vector is designed so that the DNA of the present invention after introduction into the plant body is expressed in the plant.
- the recombinant vector be adjusted so that the DNA of the present invention is arranged downstream of the expression promoter and a terminator is arranged downstream of the DNA of the present invention.
- the recombinant vectors used for this purpose can be various vectors used for ordinary plant transformation, depending on the type of the method of introducing the plant.
- plasmid vector that can be propagated in Escherichia coli, and it is better to use a plasmid vector such as a plan system when using the agrobacterium method. .
- the promoter arranged upstream of the DNA of the present invention in the recombination vector is, for example, CaMV35S ⁇ The EMBO Journal '' derived from Force Refurbished Mozaik Winores, Vol. 6, pp. 3901-3907. 1987, or JP-A-6-315381 J, corn ubiquitin promoter [JP-A-2-79983], phaseolin promoter "Plant Cell, Vol. 1, p.
- Tha Mi discriminator one that is disposed downstream of the present invention D NA for example the force re off La Wamozai click Uinore scan-derived terpolymer real roots one coater, Alternatively, a terminator derived from the nopaline synthase gene [The EMBO J., Vol. 6, pp. 3901-3907, 1987] may be used, but a promoter that functions in plants. Either one or one terminator is acceptable.
- the above-mentioned recombinant vector to be used is a plasmid vector containing an appropriate selection marker gene. Both are preferably introduced into plant cells.
- the selectable marker gene used for this purpose may be a hygromycin phospho-transferase gene that is resistant to the antibiotic hygromycin, or a canamycin, Neomycin Phosphotransferase gene, which is resistant to gentamicin, or acetyltransferase, which is resistant to the herbicide phosphinosericin It can be the gene [The EMBO Journa Vol. 6, pp. 2513-2518, 1987, or JP-A-2-171188].
- the method of introducing the DNA of the present invention into a plant as a foreign gene is carried out by the agrobacterium method [Bio / technology, Vol. 6, pp. 915-922, 1988], Electo-poration. Law [Plant cell Rep., Vol. 10, pp. 106-110, 1991], Party Knollegan method [Theor. Appl. Genet., Vol. 79, pp. 337-341, 1990], Wis
- the method can be, but is not particularly limited to, these methods.
- whiskers that can be used preferably have a diameter of 0.01 to 10 ⁇ m, preferably 0.5 to 1 ⁇ m. m
- the length is 1 to: 100 / im, preferably 3 to 40 nm.
- Whisker materials include potassium titanate, calcium carbonate, aluminum borate, silicon nitride, zinc oxide, basic magnesium sulfate, magnesia, magnesium borate, Bong graphite, calcium sulphate, sapphire and silicon carbide are preferred.
- it is preferably made of potassium titanate, calcium carbonate, or aluminum borate.
- the whisker used here can be used alone without surface treatment, but can be used for whiskers having a basic functional group on the whisker surface, preferably for surface treatment agents.
- the use of whiskers that are more surface-treated can increase the transformation rate of plant cells.
- the compound used for imparting the basic functional group to the whisker surface is not particularly limited as long as it can be covalently bonded to the whisker surface.
- it is a silane coupling agent, more preferably a silane coupling agent having a basic functional group.
- the silane coupling agents include 3- (2-amino quinoline pill), trimethoxy silane, and 3-amino pill-trie.
- Basic silane coupling agents such as toxisilane can be used. Any silane coupling agent having a basic functional group can be used .:
- the amount of plant cells to be mixed with the ice power is appropriately adjusted.
- the volume of plant cells mixed with the power of It is not limited to a specific value.
- the amount of the wiping force mixed with the plant cells in the medium liquid should be adjusted according to the volume of the plant cells. It is preferable that the whisker is added so that the whisker has a capacity S1 of 100 mg, preferably 4 to 40 mg per 1 mL of the plant cell volume of PCV.
- centrifugal acceleration of 3,000 to 50,000 Xg, preferably 10,000 to 30,000 Xg, and centrifugation time of 10 seconds to 40 minutes, preferably 5 to 10 minutes .
- the obtained precipitate is subjected to sonication.
- sonication is performed at a frequency of lk to 1 MHz, preferably 10 to 60 kHz, irradiation time of 0.2 seconds to 20 minutes, preferably 30 seconds to 2 minutes, and intensity of 0.01 to 10 W / Irradiation of ultrasonic waves at cm 2 , preferably 0.1 to W / cm 2 is preferred.
- the plant cells are separated from the sonicated mixture by centrifugation.
- the resulting plant cells contain the introduced recombinant vector containing the DNA of the present invention and a plasmid vector for a selection marker:
- the thus-obtained plant cells into which the foreign gene has been introduced are washed with a liquid medium or the like: Thereafter, an appropriate selection agent is selected according to the type of the selection marker gene introduced into the cells. It is placed on a known selection medium and cultured. This makes it possible to obtain transformed cultured plant cells. it can.
- a resin growth inhibitor for example, S- (2-aminoethyl) -cystine (AEC) or 0- (2-aminoethyl) -serine, 10 mg / l ⁇ : Can be added to the reselection medium at a concentration of 1000 mg / l, preferably 100 mg / l to 300 mg / l.
- Regenerate the body From the transformed plant cell containing the recombinant vector of the present invention re-selected as described above, which has been integrated as a foreign gene, and a vector for a selection marker, Regenerate the body. Regeneration of the plant can be performed in a known manner. For example, plant cells can be regenerated by placing the transformed plant cells re-selected as described above in a known plant regeneration medium and culturing them.
- Transformed cells placed in a medium for plant regeneration are 15 to 30 ° C, preferably 500 to 2,000 times at 20 to 28 ° C, preferably 800 to 1000 times. Incubate for 20 to 60 days, preferably 30 to 40 days, while irradiating with light.
- transformed plants can be regenerated by introducing a recombinant vector carrying a foreign gene comprising the DNA of the present invention from each plant cell.
- Plants regenerated from the transformed cells are then used in an acclimation medium Incubate with After that, if the regenerated acclimated plants are grown under normal cultivation conditions in a greenhouse, the cultivation of the plant will mature and settle in 3-6 months, and seeds can be obtained. .
- the presence of the introduced foreign gene in the transformed plant material regenerated and cultured in this manner is determined by the known PCR method and the Southern method (Southern, "J. Mol. Biol.,” Vol. 98, No. 503. (Page 517, 1975)) can be confirmed by analyzing the nucleotide sequence of DNA in plants.
- extraction of the DNA from the transformed plant can be carried out according to a known method of J. Sambrook et al. (“Molecular Cloning J 2nd edition, Cold Spring Habor Laboratory Press, 1989”).
- the DNA extracted from the regenerated plant as described above is used as a template.
- the synthesized oligonucleotides having a base sequence appropriately selected according to the base sequence of the DNA according to the first invention or the modified DNA according to the second invention are used as primers. These are mixed and added to a reaction solution for PCR to perform an amplification reaction. In this amplification reaction, if the denaturation, annealing, and extension reactions of the DNA are repeated several tens of times, an amplification product of a DNA fragment containing the DNA sequence of the present invention can be obtained.
- the reaction solution containing the amplification product is subjected to agarose electrophoresis, for example.
- various amplified DNA fragments are fractionated.
- a piece of Bandhagarose gel containing a DNA fragment recognized to contain a DNA sequence corresponding to the DNA of the present invention, which is the introduced foreign gene, is cut out.
- the nucleotide sequence of the DNA sequence of the DNA fragment contained in the cut gel piece is analyzed by the Southern method, it can be confirmed whether or not the DNA sequence corresponds to the DNA of the present invention.
- the promoter comprises a promoter which is derived from Vibrio oleracea vinoles and can be expressed in a plant, a NOS terminator, and an ampicillin resistance gene.
- a DNA fragment carrying a DNA sequence having a 1143 bp nucleotide sequence shown in SEQ ID NO: 1 or SEQ ID NO: 5 or SEQ ID NO: 7 in the sequence listing was placed in a plasmid vector under the control of the promoter.
- An integrated recombination vector is provided.
- the above-mentioned plush vector power S plus plus vector p is preferably BI221.
- FIG. 1 shows a recombinant vector for introducing a foreign gene used for transforming cultured rice cells in Example 4 described later, and a modified DNA-158N according to the second invention.
- the procedure for creating the vector p158N containing a sequence from the vector pBI221 is shown schematically.
- FIG. 2 shows that the vector p 158N and the Both schematically show the structure of the vector p35SC-SS, which is introduced into cultured rice cells and contains the phosphinothricin gene SS as a selection marker. .
- Example 2 illustrating the production of the second DNA fragment containing the modified DNA-158N sequence ij (a DNA sequence having the base sequence shown in SEQ ID NO: 5 in the sequence listing) having a sequence length of 1143 bp according to the present invention.
- Example 3 illustrating the production of a DNA fragment containing a modified DNA-166A sequence having a sequence length of 1143 bp (a DNA sequence having the nucleotide sequence shown in SEQ ID NO: ⁇ in the sequence listing) according to the second present invention.
- the second present invention will be specifically described with reference to FIG.
- Example 4 illustrates a method for transforming a rice plant by introducing the DNA of the present invention incorporated in the recombination vector as a foreign gene into a rice plant
- the third invention is described in detail.
- RNA was isolated from the obtained total RNA using an mRNA purification kit (Pharmacia Biotech, mRNA Purification Kit). In this way, about 30 ⁇ g of rice mRNA was obtained.
- cDNA was obtained using a cDNA synthesis kit (Pharmacia Biotech, TimeSaver cDNA Synthesis Kit).
- the recombinant phage obtained in this way was used in E. coli Y1088. Stained and grown. Numerous recombinant phages were obtained as lytic plaques of E. coli. The phage in the plaques consisted of a wide variety of phages containing all the rice-derived cDNA, and was used as a rice cDNA library.
- primers were designed to prepare a DNA probe to clone the cDNA fragment encoding rice DHDPS for PCR.
- two types of oligonucleotides having the following base sequences are referred to the known base sequences of the DHDPS gene of wheat and maize and the amino acid sequence of DHDPS. Were prepared as Primer No. 1 and Primer No. 2.
- Primer No. 1 (has the nucleotide sequence shown in SEQ ID NO: 3 in the sequence listing):
- Primer No. 2 (has the base sequence shown in SEQ ID NO: 4 in the sequence listing)
- oligonucleotides were prepared by synthesizing the oligonucleotides using a DNA synthesizer (Model 391, manufactured by Applied Biosystems), and then performing ion exchange HPLC. Purification was performed.
- the recombinant phage obtained in the above (2) is used by using each of the two types of synthetic oligonucleotides ( ⁇ .) As the first primer and the second primer.
- cDNA library 11 as a template, these were used as amplification reaction solutions for PCR (10 mM Tris-HCl (pH 8.3), 1.5 mM MgCl 2 , 50 mM KCl, 0.001 % Gelatin, pH 8.3; a mixture of 2.5 mM of each of the four types of nucleotides dNTP, and DNA polymerase Takara Ex Taq (2.5 units)).
- the amplification reaction solution used here was prepared using a PCR kit (PCR Amplification Kit (Takara Shuzo Co., Ltd.)).
- the amplification reaction of DNA by the PCR method was performed using a PCR reaction device (PERKIN ELMER, DNA, Thermal Cycler 480) for denaturation at 94 ° C for 30 seconds and annealing at 55 ° C for 1 minute.
- a PCR reaction device PERKIN ELMER, DNA, Thermal Cycler 480
- three reaction operations in which extension was performed at 72 ° C for 2 minutes were repeated 35 times.
- an amplification product of a DNA fragment that is a part of the DNA sequence corresponding to the rice DHDPS gene is generated, and this is collected as probe DNA.
- the following cDNA libraries were used for cloning.
- the group that is the rice cDNA library prepared in (2) above Using the probe DNA prepared in (3) above, the recombinant phage incorporating the DNA sequence corresponding to the rice DHDPS gene is screened from the recombinant phage.
- plaques of the recombinant phage which is a rice cDNA library obtained in (2) above, were formed on 1.5% agar medium.
- the plaques were transferred to Nymouth membrane (manufactured by Amersham) Hibond N.
- the phage DNA contained in the plaque of the phage transferred to the nylon membrane in this manner contains an alkaline denaturing solution (1.5 M NaC 2.0 M NaOH) and a neutralizing solution (1.0 M Tris-HCl pH5). , 2.0 M NaCl) for 10 minutes, and then immobilized on a nylon membrane by UV irradiation.
- the probe DNA obtained by labeling the probe DNA obtained in the above (4) with digoxigenin (DIG) was plaqued onto the phlegm membrane on which the phage DNA was immobilized. Hybridization was performed. Labeling of the probe DNA was performed using a DIG-ELISA DNA Labeling & Detection Kit (manufactured by Berlin-Mannheim).
- the phage DNA-immobilized nylon membrane is immersed in a hybridization solution (500 mM Na-Pin buffer, pH 7.2, 7% SDS, mM EDTA). Then, immersion treatment was performed at 65 ° C for 10 minutes. Next, the above-mentioned DIG-labeled labeling probe DNA (10 ng / ml) was added, and a hybridization reaction was carried out at 65 ° C. for 15 hours. After the completion of the reaction, the plate was washed three times with a washing solution (40 mM Na-Pi buffer, ⁇ 7.2, 1% SDS) for 20 minutes each.
- a washing solution 40 mM Na-Pi buffer, ⁇ 7.2, 1% SDS
- the target recombinant phage was detected using the above-mentioned DIG-ELISA Labeling & Detection Kit.
- ⁇ DNA was separately isolated for each of the four phage plaques using a ⁇ DNA isolation kit (Lambda DNA Purification Kit (manufactured by STRATAGENE)). .
- the isolation of I DNA was carried out as follows. That is, 50 ⁇ l of DNaseI (20 mg / ml) and 200 ⁇ l of RNaseA (2 mg / ml) were added to 5 ml of a culture solution in which each phage was grown in large amounts, and the mixture was incubated at room temperature for 15 minutes. I left it. The obtained phage growth solution was centrifuged at 15,000 rpm at 4 ° C for 10 minutes. The obtained supernatant was subjected to 25 ml of 80% DEAE-Senorelose and incubated at room temperature for 10 minutes.
- the mixed solution thus incubated was centrifuged, and 2 ml of 0.5 M EDTA and 770 ⁇ l of Pronase (50 mg / ml) were added to the obtained supernatant, and the mixture was left at 37 ° C for 15 minutes.
- a 5% CTAB solution 1% CTAB (Cetyltrimethyl-ammouium bromide), 50 mM Tris-HCl, pH 8.0, lOmM 1.5 ml of EDTA was added.
- the obtained mixture was treated at 65 ° C for 3 minutes, and then left in water for 5 minutes.
- the inserted DNA fragment in the phage determined to contain the DNA system IJ corresponding to the rice DHDPS gene is the phage DNA of the collected phage selected as described above. And obtained with restriction enzyme EcoRI.
- a DNA fragment determined to contain a DNA sequence corresponding to the DHDPS gene of rice as described above a DNA fragment obtained by excision from a phage was used as a plasmid.
- the recombinant plasmid was inserted into the EcoRI cleavage site of Bluescript II SK (+) using a DNA ligation kit and ligated to construct a recombinant plasmid vector.
- Escherichia coli XLI-Blue MRF ' was introduced by introducing the recombinant plasmid vector constructed in this way. Transformation.
- ink SOC liquid medium 2% Bact-Tripton, 0.5% Knock-Yeast extract, lOmM NaCl, 2.5 mM KC1, lOmM MgSO lOmM Mg
- E. coli culture solution 100 ⁇ l of the obtained E. coli culture solution was used at a concentration of 50 mg / l of ambicilin and 20 mg / l of X-gal (5-Bromo-4-Chloro-3-Indolyl-bD-Galactoside).
- IPTG Isopropyl-bD-thiogalactopyranoside
- LB agar medium supplemented with a concentration of 20 mg / l (1% octa-tripton, 0.5% batato-yeast extract, 0.5 ° / .NaCl, 0.1% Glucose, pH 7.5, containing 1.5% agar).
- E. coli colonies that have not developed white color are transformed into the E. coli colonies that have developed white color as E. coli transformed with the above-described ligation vector DNA. And separated.
- the 10 white-colored and ampicillin-resistant colonies of E. coli isolated in this way were grown on a liquid medium containing 50 mg / l of ampicillin, and The plasmid was separated and purified from the Escherichia coli grown by the plasmid purification kit (QIA filter Plasmid Midi Kit, manufactured by QIAGEN). By this purification, 50 ⁇ g (50 ⁇ l) of a plasmid was obtained from the transformed Escherichia coli of the resistant colony obtained above.
- the plasmid purification kit QIA filter Plasmid Midi Kit, manufactured by QIAGEN
- the above plus obtained by cloning in this way was a recombinant plasmid intended to be a DNA containing a DNA sequence corresponding to the rice DHDPS gene therein, and had a size of about 4.3 kb.
- nucleotide sequence of the DNA fragment can be determined. . Then, the nucleotide sequence of the DNA sequence corresponding to the rice DHDPS gene contained inside the DNA fragment can be determined.
- the nucleotide sequence of the DNA sequence having the nucleotide sequence determined in this way and encoding the rice DHDPS gene is described in SEQ ID NO: 1 in the sequence listing described below.
- the denaturation treatment was performed after the denaturation treatment was performed using a base-based ij kit (Autoread Sequencing Kit (Pharmacia Biotech)).
- the nucleotide sequence of the DNA fragment-H was determined by ALF DNA Sequencer II (manufactured by FANOLEMASIA CO., LTD.).
- the base sequence of the DNA sequence determined to be loaded consists of 1140 bp base in a single open reading frame described in SEQ ID NO: 1 in the sequence listing.
- the DNA having the nucleotide sequence of SEQ ID NO: 1 according to the first aspect of the present invention comprises a protein comprising 380 amino acid residues of SEQ ID NO: 2. I'm doing it.
- the amino acid sequence of SEQ ID NO: 2 was compared with the amino acid sequence of DHDPS of wheat and the amino acid sequence of DHDPS of corn (JP-A-3-27984). When compared with acid system iJ (Molecule & General Genetics, Vol. 228, pp. 287-293, 1991), it was found that the homology was 82% and 79%, respectively. In regions of the DNA sequence other than the region having this homology, a DNA sequence which is clearly different from wheat and corn and is unique to rice is represented by the first present invention. DNA has.
- This example relates to a DNA containing a DNA sequence designated as modified DNA-158N obtained by the second invention (that is, a DNA sequence having a base sequence represented by SEQ ID NO: 5 in the sequence listing). The production of a piece is exemplified.
- primer No. 3 which is an oligonucleotide having the base sequence shown in SEQ ID NO: 9 in the sequence listing, was prepared.
- a primer having a 62-mer and the nucleotide sequence of SEQ ID NO: 15 was also synthesized.
- Example 1 the DNA fragment cut out from the recombinant phage as a DNA fragment determined to contain a DNA sequence corresponding to the rice DHDPS gene was positively added.
- the recombinant vector was ligated to the EcoRI cleavage site of Midvector p Bluescript II SK (+) by DNA ligation kit.
- the following reaction was performed to add the XbaI and SacI restriction enzyme cleavage sites by PCR to the DNA fragment contained in the above recombinant plasmid pDAP8-1. .
- p 5 ⁇ l of DAP8-1 and 1 / ⁇ of the primers of SEQ ID NO: 14 and SEQ ID NO: 15 were amplified in an amplification reaction solution (10 mM Tris-HCl (pH 8.3), ImM MgCl 2 , 50 mM KC1
- the amplification reaction was carried out by adding 100 ⁇ l of a mixture of 0.2 mM each of four kinds of nucleotides dNTP and 2.5 units of LA Taq DNA polymerase).
- the amplification reaction was carried out by repeating three times of denaturation at 94 ° C for 1 minute, annealing at 60 ° C for 30 seconds, and extension at 72 ° C for 1 minute 30 times.
- the amplification reaction solution was fractionated by low-melting point agarose electrophoresis, and a DNA of about 1160 bp was cut out from the gel as an amplified DNA product. From this gel section, DHDPS gene was obtained using GENCLEAN II Kit (Funakoshi). W
- a purified DNA fragment (Xba I-DNA-Sac I) (DNA fragment-XS) having an Xba I site on the 5 'side and a Sac I site on the 3' side of the DNA sequence encoding .
- the DNA fragment (XbaI-DNA-SacI) and the cut linear plasmid vector pUCl9 were ligated with the DNA ligation kit to form a circular form.
- recombinant plasmid 0 Middector pDAP8-1-XS (about 3.9 kb) was obtained.
- This plasmid pDAP8-1-XS was used as a template in the following PCR method.
- reaction (A) 50 n1 of the recombinant plasmid vector pDAP8-1-XS used as a template, 1 ⁇ M of Bleima-1 FW-1 and the sequence 1 ⁇ l of the primer No. 9 was added to the amplification reaction mixture (10 mM Tris-HCl (pH 8.3), ImM MgCl 2 , 50 mM KC1, 4 nucleotides dNTP). 100 ⁇ l of each 0.2 mM mixture (containing 2.5 units of LA Taq DNA polymerase). Five
- DNA fragment-A The byproduct of DNA obtained by the reaction (A) is referred to as DNA fragment-A.
- the amplification reaction solution of the reaction (A) was fractionated by low-melting point gel electrophoresis, and a band containing the 480 bp DNA fragment-A as an amplified DNA product was subjected to agarose gel separation. Cut out.
- the amplification reaction solution of the reaction (B) was subjected to low-melting-point agarose electrophoresis to fractionate, and a band containing a DNA fragment-B of 1200b as an amplified DNA product was cut out from the agarose gel.
- the amplification reaction solution was fractionated by low-melting point agarose electrophoresis, and a band containing the expected DNA fragment of 1200 bp-C as an amplified DNA product was obtained.
- a band containing the expected DNA fragment of 1200 bp-C as an amplified DNA product was obtained.
- the DNA fragment-C was separated from the gel slice using a GENCLEAN II Kit (Funa 5 Koshi) and a purified DNA fragment-C was obtained.
- This DNA fragment-C is a DNA fragment of about 1350 bp in size containing a DNA-158N sequence (1143 bp in size) having the base sequence shown in SEQ ID NO: 5 in the sequence listing.
- Force 0 is also a DNA fragment having a KpnI cleavage site ahead of the 5'-end of the DNA-158N sequence and a SacI cleavage site after the 3'-end.
- DNA fragment-C 10 ⁇ g of the DNA fragment-C obtained above was mixed with 10 units of the restriction enzyme KpnI and 10 units of SacI in an L buffer (Takara Shuzo Co., Ltd.). I did it on the unit.
- the DNA fragment obtained in this manner is referred to as DNA fragment-j3.
- 10 ⁇ g of the plasmid pBluescript II SK (+) was added to 10 units of KpnI and 10 units of SacI in an L buffer (Takara Shuzo Co., Ltd.). Digestion was performed in 10 units to obtain a shortened plasmid.
- the ligation reaction mixture was mixed with 1/10 volume of 3M sodium acetate and 2 volumes of ethanol, and incubated at -20 ° C for about 6 hours.
- the incubated reaction solution was centrifuged, and the precipitated DNA was dried and dissolved in 5 ⁇ l of water to make an aqueous solution.
- the DNA contained in this aqueous solution is the same as the above DNA fragment-
- a double-stranded recombinant plasmid (p Bluescript-DNA-158N plasmid described above) prepared by ligating the shortened plasmid obtained by SacI digestion with the above-described plasmid. And the modified DNA-158N sequence was contained in the inserted DNA region.
- Escherichia coli XL1-Blue MRF ' was transformed by introducing the pBluescript-DNA-158N plasmid into Escherichia coli XL1-Blue MRF'. Further transformed E. coli cells were cultured in a liquid medium.
- Plasmid was further extracted from the cultured E. coli cells. In this way, a recombinant plasmid containing the modified DNA-158N sequence could be cloned.
- the agarose was dissolved by heating. The resulting solution is The agarose was removed by extraction twice with a chiller. 1/10 volume of 3M sodium acetate and 2 volumes of ethanol are added to the phenol extract containing the obtained DNA, and it is heated to -20 ° C for about 6 hours. It was left to incubate. The imprinted solution was centrifuged at 15000 rpm at 4 ° C for 10 minutes. The obtained DNA precipitate was dried under reduced pressure, and the obtained DNA powder was dissolved in 10 ⁇ l of water. The DNA powder consisted of a DNA fragment--2 containing the desired modified DNA-158N sequence.
- This example relates to a DNA containing a DNA sequence designated as modified DNA-166A obtained by the second invention (that is, a DNA sequence U having the base sequence of SEQ ID NO: 7 in the sequence listing).
- modified DNA-166A obtained by the second invention
- the production of a piece is exemplified.
- chemically synthesize primer No. 4 which is an oligonucleotide having the nucleotide sequence of SEQ ID NO: 10 in the sequence listing. It was constructed by
- the vector pDAP8-l-XS described in item (2) of Example 2 has the nucleotide sequence shown in SEQ ID NO: 1 between its XbaI cleavage site and SacI cleavage site. DNA sequence That is, a DNA fragment containing the aforementioned DHPDPS-DNA-1143 system! J) and having a sequence length of about 1200 bp is inserted therein.
- This recombinant vector pDAP8-l-XS was also used as a template in the PCR method described below in Example 2 as well.
- the reaction (A) 5 ⁇ l of the recombinant plasmid vector pDAP8-l-XS used as a template, 1 ⁇ M of the primer FW-1 and SEQ ID NO: 10 Of the primer No. 4 and the amplification reaction mixture (10 mM Tris-HCl (pH 8.3), lmM MgCl 2 , 50 mM KC1, 0.2 mM each of 4 nucleotides dNTP) , Containing 2.5 units of LA Taq DNA polymerase), and an amplification reaction was performed.
- the DNA amplification product obtained by this (II) reaction is referred to as DNA fragment-D.
- the amplification reaction solution of the reaction (A) was fractionated by low-melting point agarose electrophoresis, and a band containing a 480 bp DNA fragment-D as an amplified DNA product was agarose-containing. It was cut out from the sogel force.
- the amplification reaction solution of the reaction (B) is subjected to low-melting-point agarose electrophoresis and fractionated, and a band containing 1200b DNA fragment-B as an amplified DNA product is cut out from the agarose gel. did.
- the amplification reaction solution was fractionated by low-melting point agarose electrophoresis, and a band containing the expected DNA fragment-E of 1200 bp as an amplified DNA product was gelated. I cut out the force.
- the DNA fragment-E was separated from the gel slice using the GENCLEAN II Kit (Funakoshi) and a purified DNA fragment-E was obtained.
- This DNA fragment-E is a DNA fragment of about 1350 bp in size containing DNA-166A having a base sequence shown in SEQ ID NO: 7 in the sequence listing (1143 bp in size).
- the DNA fragment has a Kpn1 cleavage site at the 5′-end of the DNA-166A sequence and a SacI cleavage site at the back of the 3′-end of the DNA-166A sequence.
- the thus obtained DNA fragment- ⁇ aqueous solution (51) and 5 ⁇ l of the shortened plasmid DNA aqueous solution were mixed, and then contained in the obtained mixture (10 ⁇ l).
- the resulting DNA was ligated with a DNA Ligation kit (Takara Shuzo Co., Ltd.). To the ligation reaction solution, 1/10 volume of 3M sodium acetate and 2 volumes of ethanol were added, and the mixture was incubated at -20 ° C for about 6 hours. The incubated reaction solution was centrifuged, and the precipitated DNA was dried and dissolved in 5 ⁇ l of water to make an aqueous solution.
- the DNA contained in this aqueous solution ligates the above-mentioned DNA fragment- ⁇ with the above-mentioned shortened plasmid obtained by digestion of the plasmid vector pBluescript II SK (+) with Kpn-1 and SacI.
- c Ri recombinant plastics (referred to as p Bluescript-DNA-166A blanking la scan Mi-de) S Mi de der made, in its ⁇ DNA region containing the pre Symbol of DNA-166A sequences Te
- Plasmid was further extracted from the cultured E. coli cells. Thus, a clone containing the modified DNA-166A sequence could be cloned.
- the agarose was removed by extracting twice with saturated phenol. The phenol extract containing the obtained DNA was reduced to 1/10 volume of 3M. Sodium acetate and twice the volume of ethanol were added, and the mixture was incubated at -20 ° C for about 6 hours. The incubated solution was centrifuged at 15000 rpm and 4 ° C for 10 minutes. The obtained DNA precipitate was dried under reduced pressure, and dissolved in the obtained powder and the water of 10] 11. It consisted of a DNA fragment of about 1200 bp containing the DNA-166A sequence- ⁇ -2 force.
- DNA fragment-] 3 -2 obtained in (5) of Example 2 was subjected to a base sequence determination kit in the same manner as described in (7) of Example 1. Use an automatic DNA sequencer, ALF DNA Sequener II. DNA fragment-] 3 -2 was confirmed to be a DNA fragment containing the modified DNA-158N sequence having the nucleotide sequence described in No. IJ No. 5 in the table of No. 1
- DNA fragment- ⁇ -2 obtained in Example 3 (5) was also subjected to a nucleotide sequence determination test in the same manner as described above.
- DNA fragment- ⁇ -2 was confirmed to be a DNA fragment containing a modified DNA-166A sequence having the nucleotide sequence of SEQ ID NO: 7 in the sequence listing.
- This example describes a method for transforming a rice plant, which comprises introducing the DNA sequence according to the first invention or the modified DNA sequence according to the second invention into a rice plant as a foreign gene. Show.
- the obtained mixture was treated with a DNA ligation kit (Takara Shuzo Co., Ltd.) to carry out a DNA ligation reaction.
- a DNA ligation kit (Takara Shuzo Co., Ltd.) to carry out a DNA ligation reaction.
- the XbaI-SacI-cleaved vector fragment of the plasmid vector ⁇ 221 is linked to the DNA fragment-XS to form a circular form.
- vector pDAP Fifteen recombinant vectors were created. This recombinant vector is called vector pDAP.
- the vector pDAP has a DNA fragment-XS region inserted and ligated between a 35S promoter region and a NOS terminator region, and contains an ampicillin resistance gene (containing Am). 4.9kb size
- Example 2- instead of the DNA fragment obtained in Example 2-XS, the DNA fragment obtained in Example 2-) 3 -2 (i.e., described in SEQ ID NO: 5 according to the second present invention) Approximately 1143 bp in size containing modified I-158N system IJ (1143 bp in size) was ligated to the XbaI-SacI-cleaved-vector fragment of plasmid vector pBI221 by the same ligation reaction as described above.
- the ring-shaped recombination vector thus created is referred to as a vector pl58N.
- Vector pl58N has a structure in which the DNA fragment-) 3 -2 region is inserted and ligated between the 35S promoter region and the NOS terminator region, and has a size of 4.9 kb. did.
- the DNA fragment- ⁇ -2 obtained in Example 3 (that is, the second fragment of SEQ ID NO: 7 according to the present invention) was used.
- a plasmid vector was obtained by the same ligation reaction as described above. Ligation was performed on the XbaI-SacI-cut-vector fragment of pBI221.
- the ring-shaped recombination vector thus created is referred to as vector pl66A.
- the vector pl66A had a structure in which the DNA fragment- ⁇ -2 region was inserted and ligated between the 35S promoter region and the NOS terminator region, and had a size of 4.9 kb. .
- the obtained culture solution of Escherichia coli was plated on an LB agar medium supplemented with ampicillin and other additives in the same manner as described in Example 1, section (6). Escherichia coli was cultured at 37 ° C for 16 hours.
- Escherichia coli colonies transformed by introduction of the recombinant vector pDAP or the recombinant vector 158N or the recombinant vector 166A and resistant to ampicillin was obtained.
- Ten E. coli colonies were grown on a liquid medium containing 50 mg / l of ampicillin.
- the recombinant plasmid was separated using a plasmid purification kit (QIA filter Plasmid Midi Kit, manufactured by QIAGEN), and the E. coli cell strain grown on each of the 10 colonies was separated. And refined.
- a plasmid purification kit QIA filter Plasmid Midi Kit, manufactured by QIAGEN
- Each of the obtained recombinant plasmids was digested with restriction enzymes XbaI and SacI, and the obtained DNA fragments were analyzed by agarose gel electrophoresis.
- the DHDPS-DNA-1143 sequence according to the first invention of the present invention is normally ligated downstream of the 35S promoter in the obtained recombinant plasmid.
- Recombinant plasmid was selected as vector pDAP and collected.
- the modified DNA-protein of the second invention of the present invention is normally located downstream of the 35S promoter.
- a recombinant plasmid to which the 158N sequence was linked was selected as a solid P158N and collected.
- the modification according to the second invention of the present invention is normally performed downstream of the 35S-opening motor in the recombinant plasmid.
- the recombinant plasmid to which the DNA-166N sequence was linked was selected as vector p166A and collected.
- Escherichia coli XLl-Blue MRF7pl58N transformed by the introduction of the recombinant vector pl58N thus obtained was named Escherichia coli XLl-Blue MRF7pl58N. Deposited at the Institute of Biotechnology, Institute of Industrial Science and Technology, Tsukuba City, Ibaraki Prefecture, Japan, on April 13, 1998, under the terms of the Budapest Treaty with the accession number of FERM BP-6323. It is.
- Escherichia coli XLl-Blue MRF 'transformed by introduction of the recombinant vector pl66A thus obtained was named Escherichia coli XLl-Blue MRF7pl66A.
- the Institute of Biotechnology and Industrial Technology, Institute of Industrial Science and Technology, Tsukuba, Ibaraki Prefecture since April 13, 1998, has been assigned to the above research institute under the terms of the Budapest Treaty under the accession number of FERM BP-6324. Deposited:.,
- the seeds with hulls obtained were immersed in a 70% ethanol solution for 60 seconds and then in a sodium hypochlorite solution containing about 1% available chlorine for 6 minutes to sterilize the seeds. In addition, the seeds were washed with sterile water.
- recombinant vector ie, vector DAP or pl58N or pl66A
- 10 ⁇ l containing 10 ⁇ g of DNA
- a plasmid vector p35SC-SS containing a herbicide phosphinothricin resistance gene Japanese Patent Application Laid-Open No. 8-154513
- 10 ⁇ l containing 10 DNAs
- the tube containing the homogeneous mixture was then centrifuged at 18000 ⁇ g for 5 minutes. The centrifuged mixture was shaken again. This centrifugation operation and the shaking operation were repeated three times.
- mixture The tube containing the object was placed so that the tube was sufficiently immersed in the bathtub of the ultrasonic generator.
- Ultrasonic waves with a frequency of 40 kHz were irradiated at an intensity of 0.25 W / cm 2 for 1 minute. After irradiation, the mixture sonicated at 4 ° C for 30 minutes was incubated.
- the mixture thus sonicated was washed with R2 liquid medium to obtain the desired transformed callus cells into which the recombinant vector had been introduced.
- the callus containing the transformed cells into which the recombinant vector had been introduced as described above was placed in a 3.5 cm petri dish.
- 3 ml of a liquid medium obtained by adding 30 g / l of sucrose and 2 mg / l of 2,4-PA to the inorganic component composition of the R2 medium was added. After that, callus cells were cultured on a rotary shaker (50 rpm) at 28 ° C while irradiating with 2000-norex light for 16 hours per day to obtain dividing cells. .
- the DNA according to the second aspect of the present invention is sufficiently introduced as a foreign gene and transformed. Reselect only the desired culture cells.
- 400 transforming cells (2 mm in diameter) were converted to 30 g / l of sucrose, 2 mg / l of 2,4-PA, and 3 g / l of genorelite in the mineral composition of the N6 medium.
- AEC S- (2-aminoethyl) cysteine
- Canoleth cells were cultured for 30 days while irradiating with 28 C, 2000 Nox light per day for 16 hours.
- Transformative vegetative cells containing the vector pl58N or pl66A that could grow on the AEC-supplemented medium were re-selected in this way.
- Buds and roots were regenerated from transformed callus cells: Regenerated buds and roots contained germs (buds grown to a length of 10 to 30 mm), sucrose 30 g / l, and gel light 3 g / l The cells were transplanted into test tubes (45 mm in diameter and 25 cm in length) containing MS medium. Ported The germ was cultured for 20 days to obtain a transformed rice plant. According to the method described above, the DHDPS-
- Eighty rice plants could be regenerated from 98 transforming forceless cells containing the DNA-1143 sequence as a foreign gene. Further, a transformed AEC-resistant transformant cell containing the modified DNA-158N sequence according to the second invention as a foreign gene is also described.
- 79 rice plants could be regenerated from 100 AEC-resistant transformed callus cells containing the modified DNA-166A sequence according to the second invention as a foreign gene.
- the DNA encoding DHDPS was analyzed by the PCR method according to the following procedure.
- Leaves were collected from the regenerated rice plant obtained in the above section (10). 50 mg of the leaf was placed in a 1.5 ml microcap tube, 300 ⁇ l of 20 mM Tris-HCl buffer (pH 7.5) containing 10 mM EDTA was added, and the mixture was ground. 20 ml of 20% SDS was added to the ground material, and the mixture was heated at 65 ° C for 10 minutes. 100 ⁇ l of 5M potassium acetate was added to the obtained mixture, placed on ice for 20 minutes, and then centrifuged at 1,7000 ⁇ g for 20 minutes. Isoprono II was added to the resulting supernatant.
- RNA derived from the regenerated rice plant was used as a template.
- Reaction solution for amplification (10 mM Tris-HCl (pH 8.3), l.OmM MgCh, 50 mM KC1, 0.01% gelatin, pH 8.3, dNTP 0.2 mM each, and Taq DNA polymerase 2.5 units) 100 1 Added to 1. Then, an amplification reaction was performed.
- the amplification reaction solution used was prepared with a PCR kit (PCR Amplification Kit (Takara Shuzo Co., Ltd.)).
- the amplification reaction was performed in a PCR reactor (Program Temp Control System PC-700 (manufactured by Aztec)), denaturation 94 ° C, 1 minute, annealing 60 ° C, 30 seconds, extension 72 °. C, one minute
- the DHDPS-DNA-1143 of the present invention was analyzed. It was confirmed that a DNA fragment corresponding to the sequence, the modified DNA-158N sequence or the modified DNA-166A sequence was present in various DNA fragments extracted from the regenerated rice plant as described above.
- the regenerated rice plants in which the introduced foreign gene was confirmed by performing the gene analysis by the PCR method were transplanted and cultivated in pots containing culture soil. . Since these regenerated rice plants grew normally, self-fertilized seeds could be obtained.
- acetonitrile extract was dried under reduced pressure, 1 ml of distilled water was added to obtain an aqueous solution.
- the aqueous solution was centrifuged at a centrifugal acceleration of 17000Xg for 20 minutes to remove the supernatant.
- HPLC high-performance liquid chromatography
- the amount of 20 was 0.8 ml / min, and the absorbance of light at 350 nm was measured to evaluate the resin content.
- the novel DNA sequence according to the present invention is used as a foreign gene and a recombinant vector having a promoter that can be expressed in plant cells is used.
- a recombinant vector having a promoter that can be expressed in plant cells is used.
- the present invention provides a novel DNA sequence capable of encoding rice dihydrodipicolinate synthase.
- the DNA sequence according to the present invention can be used to produce rice and other useful plants, for example, maize, soybean, wheat, and oats, by conventional biotechnological techniques. Can also be introduced as a foreign gene. Therefore, the DNA sequence provided in the present invention is useful for breeding a new plant that can produce a seed having a high lysine content.
- Sequence type nucleic acid
- GGT GCT GAA GCT GTA ATA CTT GGA GGA ACA. ACA.
- GGA GAG GGC CAC CTT 384 Gly Ala Glu Gly Val lie Val Gly Gly Thr Thr Gly Glu Gly His Leu
- TAC AAT GTT CCA TCT AGG ACT GGC CAG GAT ATT CCT CCT GCA GTT ATT 672 Tyr Asn Val Pro Ser Arg Thr Gly Gin Asp lie Pro Pro Ala Val lie
- Trp Pro Ala a Val Ala Ala Pro Ala Pro Leu Leu Arg lie Ser Arg
- Glu Ser lie Gly Arg Glu Asn Phe Val Gly Glu Asn Glu Ala Arg Val
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
- Sequence type nucleic acid
- Trp Pro Ala a Val Ala Ala Pro Ala Pro Leu Leu Arg lie Ser Arg
- AAG ⁇ GCA TTG CAG GCC ATC ACC CTT GAT GAT TAT CTT CCA.
- TTT GAT CTC GAA GCA TAT G3 ⁇ 4T TCA CTG ATA AAT ATG CAG ATA GAT GGT 336 Phe Asp Leu Glu Ala Tyr Asp Ser Leulie Asn Met Gin lie Asp Gly
- GGT GCT AAA GIT AAA GTG GTA GGC AAC ACA GGT AGT ATC TCA ACA 480 Phe Gly Ala Lys Val Lys Val Val Gly Asn Thr Gly Ser lie Ser Thr 145 150 155 158 160
- TAC ⁇ GTT CCA TCT AGG ACT GGC CAG GAT ATT CCT CCT GCA GTT ATT 672 Tyr Asn Val Pro Ser Arg Thr Gly Gin Asp lie Pro Pro Ala Val lie
- AGT GGT AAT GAT GAT GAT GAA TGC CAT GAT TCT AGG TGG AAA TAT GGT GCC 816 Ser Gly Asn Asp Asp Glu Cys His Asp Ser Arg Trp Lys Tyr Gly Ala
- Trp Pro Ala Ala Val Ala Ala Pro Ala Pro Leu Leu Arg lie Ser Arg
- Glu Ser lie Gly Arg Glu Asn Phe Val Gly Glu Asn Glu Ala Arg Val
- Sequence type nucleic acid
- AGT ACT GAA GTG AAA ⁇ CGG ACA TCA ACA GCT GAT
- ATC ACT ACT 240 Arg Ser Thr Glu Val Lys Asn Arg Thr Ser Thr Ma Asp He Thr Ser 65 70 75 80
- GGC CAC CTT 384 Gly Ala Glu Gly Val lie Val Gly Gly Thr Thr Gly Glu Gly His Leu
- GAA TCT AT GGA CGG GAA AAC TTT GTG GGT GAG AAC GAG GCA CGG GTT 1104 Glu Serlie Gly Arg Glu Asn Phe Val Gly Glu Asn Glu Ala Arg Val
- Trp Pro Ala Ala Val Ma a Pro Ala Pro Leu Leu Arg lie Ser Arg
- Glu Ser lie Gly Arg Glu Asn Phe Val Gly Glu Asn Glu Ala Arg Val
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
- Sequence type nucleic acid
- Sequence type nucleic acid
- Sequence type nucleic acid
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
- Sequence type nucleic acid
- Sequence type other nucleic acid synthetic DNA
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Genetics & Genomics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Chemical & Material Sciences (AREA)
- Zoology (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Microbiology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Plant Pathology (AREA)
- Cell Biology (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Medicinal Chemistry (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Nutrition Science (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Peptides Or Proteins (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
- Enzymes And Modification Thereof (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000544812A JP3814482B2 (ja) | 1998-04-17 | 1998-04-17 | イネのジヒドロジピコリネートシンターゼの遺伝子と該遺伝子に関連するdna |
PCT/JP1998/001784 WO1999054483A1 (fr) | 1998-04-17 | 1998-04-17 | Gene de la dihydrodipicolinate synthase du riz et adn associe |
CA002330839A CA2330839A1 (en) | 1998-04-17 | 1998-04-17 | Gene of rice dihydrodipicolinate synthase and dna relating to the same |
AU68541/98A AU770223B2 (en) | 1998-04-17 | 1998-04-17 | Gene of rice dihydrodipicolinate synthase and DNA relating to the same |
US09/673,397 US6451537B1 (en) | 1998-04-17 | 1998-04-17 | Gene of rice dihydrodipicolinate synthase and DNA relating to the same |
EP98914084A EP1072685A4 (en) | 1998-04-17 | 1998-04-17 | FOR DIHYDROPIKOLINATE SYNTHASE FROM RICE-ENCODING GENE AND DNA |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1998/001784 WO1999054483A1 (fr) | 1998-04-17 | 1998-04-17 | Gene de la dihydrodipicolinate synthase du riz et adn associe |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999054483A1 true WO1999054483A1 (fr) | 1999-10-28 |
Family
ID=14208071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/001784 WO1999054483A1 (fr) | 1998-04-17 | 1998-04-17 | Gene de la dihydrodipicolinate synthase du riz et adn associe |
Country Status (6)
Country | Link |
---|---|
US (1) | US6451537B1 (ja) |
EP (1) | EP1072685A4 (ja) |
JP (1) | JP3814482B2 (ja) |
AU (1) | AU770223B2 (ja) |
CA (1) | CA2330839A1 (ja) |
WO (1) | WO1999054483A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001047980A1 (fr) * | 1999-12-27 | 2001-07-05 | Shanghai Biowindow Gene Development Inc. | Nouveau polypeptide, dihydrodipicolinate synthase 9, et polynucleotide codant pour ce polypeptide |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4684551B2 (ja) | 2003-12-25 | 2011-05-18 | 東レ・ダウコーニング株式会社 | 変色防止又は変色低減方法及び変色防止又は変色低減剤並びに当該変色防止又は変色低減剤を含むジオルガノポリシロキサン組成物 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03127984A (ja) * | 1989-10-12 | 1991-05-31 | Tosoh Corp | 小麦ジヒドロジピコリネート・シンターゼ |
US5545545A (en) * | 1993-04-27 | 1996-08-13 | Regents Of The University Of Minnesota | Lysine-insensitive maize dihydrodipicolinic acid synthase |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5367110A (en) * | 1990-11-13 | 1994-11-22 | Yeda Research And Development Co. Ltd. | Transgenic plants overproducing threonine and lysine |
-
1998
- 1998-04-17 EP EP98914084A patent/EP1072685A4/en not_active Withdrawn
- 1998-04-17 AU AU68541/98A patent/AU770223B2/en not_active Ceased
- 1998-04-17 CA CA002330839A patent/CA2330839A1/en not_active Abandoned
- 1998-04-17 JP JP2000544812A patent/JP3814482B2/ja not_active Expired - Fee Related
- 1998-04-17 US US09/673,397 patent/US6451537B1/en not_active Expired - Fee Related
- 1998-04-17 WO PCT/JP1998/001784 patent/WO1999054483A1/ja not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03127984A (ja) * | 1989-10-12 | 1991-05-31 | Tosoh Corp | 小麦ジヒドロジピコリネート・シンターゼ |
US5545545A (en) * | 1993-04-27 | 1996-08-13 | Regents Of The University Of Minnesota | Lysine-insensitive maize dihydrodipicolinic acid synthase |
Non-Patent Citations (3)
Title |
---|
FUMIKO MATSUMOTO, ET AL.: "COOKING AND RICE", COOKING AND RICE, XX, XX, 1 January 1979 (1979-01-01), XX, pages 07 - 09, XP002921502 * |
GHISLAIN M., ET AL.: "A DINULCLEOTIDE MUTATION IN DIHYDRODIPICOLINATE SYNTHASE OF NICOTIANA SYLVESTRIS LEADS TO LYSINE OVERPRODUCTION.", THE PLANT JOURNAL, BLACKWELL SCIENTIFIC PUBLICATIONS, OXFORD., GB, vol. 08., no. 05., 1 January 1995 (1995-01-01), GB, pages 733 - 743., XP002921503, ISSN: 0960-7412, DOI: 10.1046/j.1365-313X.1995.08050733.x * |
See also references of EP1072685A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001047980A1 (fr) * | 1999-12-27 | 2001-07-05 | Shanghai Biowindow Gene Development Inc. | Nouveau polypeptide, dihydrodipicolinate synthase 9, et polynucleotide codant pour ce polypeptide |
Also Published As
Publication number | Publication date |
---|---|
AU6854198A (en) | 1999-11-08 |
EP1072685A4 (en) | 2002-11-27 |
EP1072685A1 (en) | 2001-01-31 |
CA2330839A1 (en) | 1999-10-28 |
JP3814482B2 (ja) | 2006-08-30 |
AU770223B2 (en) | 2004-02-19 |
US6451537B1 (en) | 2002-09-17 |
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