WO1999013087A1 - Nouvelle protoporphyrinogene oxydase tolerante vis-a-vis des herbicides necessitant de la lumiere - Google Patents
Nouvelle protoporphyrinogene oxydase tolerante vis-a-vis des herbicides necessitant de la lumiere Download PDFInfo
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- WO1999013087A1 WO1999013087A1 PCT/JP1998/004064 JP9804064W WO9913087A1 WO 1999013087 A1 WO1999013087 A1 WO 1999013087A1 JP 9804064 W JP9804064 W JP 9804064W WO 9913087 A1 WO9913087 A1 WO 9913087A1
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- gene
- herbicide
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- amino acid
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Classifications
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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
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
- C12N9/001—Oxidoreductases (1.) acting on the CH-CH group of donors (1.3)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
- C12N15/8274—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for herbicide resistance
Definitions
- the present invention relates to protoporphyrinogenogenoxidases derived from plants, in particular tobacco, which are resistant to light-requiring herbicides, the tano.
- the present invention relates to a gene encoding a protein, a recombinant vector containing the gene, and a transformant using the vector.
- Protoporphyrinogenoxidase is a tetrapyrrolyl synthesis system ubiquitous in all organisms.
- V is an enzyme that converts protoporphyrinogen ⁇ to protoporphyrin ⁇ .
- E. coli hemG was first isolated as a protoporphyrinogenoxidase gene (Sasarman, A. et al. (1993) Can.J. Microbiol. 39: 1156-1161.) Bacterial hemY was isolated as the protoponolefilinogenoxidase gene (Dailey, TA et al. (1994) J. Biol. Chem.
- a light-requiring herbicide-tolerant protoporphyrininogenoxidase gene derived from a higher plant is a promising candidate gene to be used.
- Protoponolefilinogenoxidase from other organisms such as E. coli protoporphyrinogenoxidase, has structurally greatly different molecular weights compared to those of other organisms.
- Bacterial protovorphyrinogen oxidase differs significantly from protoporphyrin monogenoxidase in other membrane-bound organisms in that it is soluble.
- animal protoponoleurinogenoxidase has a special property in that it has no transit peptide, but is still capable of being transported to mitochondria. Due to such differences in the properties of protoporphyrinogen oxidase derived from various organisms, when a light-demanding herbicide-tolerant plant is produced by genetic recombination, a plant derived from a higher plant is desirable.
- an object of the present invention is to provide a protoporphyrino-genoxidase derived from a higher plant that is highly resistant to a light-requiring herbicide, a gene encoding the enzyme, a recombinant vector containing the gene, and a vector comprising the vector. And to provide a transformant.
- the present inventors have conducted intensive studies on protoporphyrinogenoxidase of higher plants that solve the above problems, and as a result, selected plant cells in the presence of herbicides, After confirming that the resistant gene in the plant has sufficient biological activity and high light-requiring herbicide resistance in the plant cell, the gene is identified by a specific method. We took the measure of isolation. Specifically, as a result of intensive studies on protoporphyrinogen oxidase of higher plants that solve the above-mentioned problems, particularly tobacco, protoporphyte that is resistant to light-requiring herbicides derived from tobacco. The gene for linogen oxidase was successfully cloned and expressed.
- the gene of the present invention is novel, and the degree of resistance of the gene product to light-requiring herbicides was compared with that of protoporphyrin monogenoxidase derived from Arabidopsis thaliana, which has been reported previously. Despite the high similarity of the structure, it became clear that the resistance of this gene product was greatly superior. Therefore, the task is to It can be solved by using
- the present invention relates to an amino acid sequence described in SEQ ID NO: 2 in the sequence listing, and deletion or addition of one or more amino acids in the amino acid sequence, substitution or the like is recognized and substantially equivalent.
- a mutant peptide having photoenzyme-resistant herbicide resistance, a protoponolefilinogenogenoxidase, and a derivative or mutant thereof, which have a strong enzyme activity, are eliminated.
- the transit peptide lacks the amino acid sequence of SEQ ID NO: 2 and has an amino acid sequence that exhibits the resistance to a light-requiring herbicide having substantially the same enzymatic activity. Provide oxidase.
- the amino acid sequence represented by SEQ ID NO: 2 of the protoponolefilinogenoxidase of the present invention has substantially the same enzymatic activity and resistance to light-requiring herbicides as long as Mutated peptides in which one or more amino acids are deleted, added or substituted in the amino acid sequence, ie, mutated peptides found in nature or artificially modified mutated peptides.
- the polypeptides of the present invention are believed to be enzymes present in chloroplasts.
- most of the proteins present in organelles such as chloroplasts are encoded in the nuclear genome, and after being translated in the cytoplasm, act by a transport signal called a transit peptide at the N-terminus. It is transported to these organelles. After transport, the transit peptide is excised to a mature protein. Therefore, it is considered that a transit peptide also exists at the N-terminus of the polypeptide of the present invention.
- the essence of expressing biological activity lies in the portion excluding the transit peptide (mature protein portion), and transit peptides are not involved in the activity. Accordingly, the present invention includes the mature protein portion lacking the transit peptide.
- the present invention relates to the nucleotide sequence of SEQ ID NO: 3, or the nucleotide sequence, wherein one or more nucleotides are attached, deleted or substituted, and substantially
- the present invention provides a protoporphyrinogen oxidase gene having an enzyme activity equivalent to that of protoporphyrinogen oxidase and exhibiting ft resistance to a light-requiring herbicide.
- a cDNA encoding the desired protoporphyrinogen oxidase, a chromosomal DNA containing introns and exons, and an intron of the same chromosomal DNA are removed from the DNA sequence according to the present invention encoding the polypeptide, and exons are ligated.
- DNAs, and synthetic DNAs obtained by linking oligonucleotides artificially produced by the synthetic DNA method are obtained by linking oligonucleotides artificially produced by the synthetic DNA method.
- the base sequence IJ of the gene is changed without changing the amino acid sequence due to the degeneracy of the genetic code. By doing so, the desired recombinant DNA can be prepared. Therefore, the DNA of the present invention also includes all nucleotide sequences based on the degeneracy of the gene encoding the polypeptide of interest.
- the present invention also provides a recombinant vector containing the above-mentioned gene and a transformant using the above-mentioned vector.
- Fig. 1 is a schematic diagram of pBNtPX-1
- Figure 2 is a schematic diagram of pCR-HC and pCR-RC
- the amino acid at position 231 changes from alanine to valine
- Figure 3 is a schematic diagram of pBAtPX-C and pBAtPX-RC
- Fig. 4 is a schematic diagram of pBI-NtPX-HC and pBI-NtPX-RC.
- Figure 5 is a schematic diagram of pBI-AtPX-HC and pBI-AtPX-RC
- the light-requiring herbicide used in the present invention is a herbicide that requires light for herbicidal activity expression.
- a light-requiring herbicide When a light-requiring herbicide is applied to a plant, first, the membrane system in the cell is peroxidized. Are destroyed, then the above-ground parts are whitened and eventually die.
- Protoporphyrin IX was found to accumulate in cells treated with light-requiring herbicides (Matringe, M. and Scalla,. (1988) Plant Physiol. 86: 619-622.).
- the target enzyme of the herbicide was found to be protoporphyrinogen oxidase, which converts protoponoleurinogen to protoporphyrin in the tetravirol synthesis system (Matringe, M. et al.
- This protoporphyrin IX causes a photosensitization reaction in the presence of light, generating a large amount of reactive oxygen, which peroxidatively destroys the membrane system and causes the plant to die (Scal la, R. and Matringe, M. (1994) Rev. Weed Sci. 6: 103-132.): Due to this mode of action, light-requiring herbicides are protoporphyrinogenogenoxidase (Protox) inhibitors and porphyrin-accumulating herbicides. It is also called an agent.
- Protox protoporphyrinogenogenoxidase
- porphyrin-accumulating herbicides It is also called an agent.
- Light demanding herbicides include compounds of various structures. Representative examples include difuunyl ethers, oxaziazoles, pyridines, pyrimidines, cyclic imides, triazoles, and birazinoles (Scalla, R. and Matringe, M. (1994) Rev. Weed Sci. 6: 103-132 ⁇ ).
- the light-requiring herbicide of the present invention is preferably a triazole-based or pyrazole-based compound, and most preferably, for example, a pyrazole-based compound shown below.
- Plants can re-differentiate from a single cell, protoplast, through a callus, a cell mass, to a complete plant again, and this property of the plant is called totipotency. .
- those cells can be mentioned that the rich very mutations, such mutations are called somatic mutations (somac l ona l variation). Therefore, any such cultured cells
- a herbicide a herbicide-resistant cell can be obtained, and the obtained herbicide-resistant cell can be regenerated to a plant using the totipotency.
- Examples of such plants are dali phosphate-resistant plants (Singer, SR and Mcdaniel, CN (1985) Plant Physiol.
- herbicide-tolerant gene can be isolated from the herbicide-tolerant cells, the obtained gene can be introduced into various useful crops by a known method, for example, the agrobacterium method.
- Such herbicide resistance genes include genes that degrade the herbicide itself, such as the promoxinil degradation gene (Stalker, D.. Et al.
- the bialaphos degradation gene (De Block, M. et al. (1987) EMBO J. 6: 2513-2518), genes that degrade any toxic substances produced by herbicides, such as the superoxide dismutase gene (Furusawa, I. et al. (1987) Plant Cell Physiol. 25: 1247-1252.), a herbicide-resistant target enzyme gene, for example, a snorefonylperarea-resistant acetate-butyrate synthase (ALS) gene (Lee, KY et al. (1988) EMBO, J.
- ALS snorefonylperarea-resistant acetate-butyrate synthase
- EPSPS 5-enolpyruvylshikimate-3-phosphate synthase
- the mechanisms of resistance in herbicide-resistant cultured cells may include the acquisition of detoxification mechanisms, changes in drug permeability into cells, overproduction of target enzymes, and mutation of target enzymes into herbicide-resistant forms. . Elucidation of the power of resistance by any mechanism The elucidation of the presence or absence of the precursor of the reaction inhibited by the herbicide, the comparison of resistance to various structures of herbicides showing the same or different mechanisms of action, It can be estimated by extracting the target enzyme from susceptible cells and comparing the enzyme activities, and examining in vitro the sensitivity of the target enzyme to the herbicide used for selection. As a result, if it becomes clear that a useful herbicide-tolerant gene is retained, it will be a useful gene source for isolating the herbicide-tolerant gene.
- Methods for clawing a gene include a method using information on proteins, a method using information on nucleic acids, and a genetic method.
- Methods using protein information include methods for purifying a target protein, using an antibody against the target protein, screening an expression type library, and amino acid sequences of the target protein. There is a method of elucidating even a part of the sequence and synthesizing the information nucleic acid probe or PCR primer. However, generally, it is relatively difficult to purify proteins.
- the method using nucleic acid information uses the homology of genes between organisms, uses genes of other organisms as probes, and uses hybridization or the like to identify the gene of interest. It is a method of catching.
- the homology of genes between organisms varies depending on the type of organism, the organism, the gene, and the conditions of hybridization are experimentally determined after experimenting with various conditions. In some cases, optimal conditions may not be obtained. In these methods, it is necessary to confirm the biological activity of the obtained gene product by any means.
- the genetic method means that the same protein gene derived from a heterologous organism is expressed in a mutant microorganism strain in which the gene of interest is genetically deficient, for example, Escherichia coli, Bacillus subtilis, yeast, etc. It is a method that is introduced in a suitable form and complements the growth. This method is also called genetic complementation, and when the gene is isolated, the biological activity of the gene product has already been confirmed.
- a gene derived from a higher organism is expressed in a microorganism, a vector-derived protein or transit peptide that cannot exert enzymatic activity without post-translational modification such as addition of a sugar chain is attached to the N-terminus.
- Glutamate-1-semialdehyde is synthesized from Glu-tRNA Glu-tR ⁇ 'A Reductase
- Glutamate- 1 semialdehyde is synthesized 5-Aminolevul inic acid is synthesized.
- Semialdehyde aminotransferase has been cloned by genetic complementation using hemA gene deficient mutants and hem mutants of E. coli (Ilag, Shi L et al., (1994) Plant Cell 6: 265-275) .).
- a gene-deficient mutant of Escherichia coli is also effective when cloning plant protoporphyrinogenoxidase by a genetic method.
- Mutants of E. coli lacking protoporphyrinogenoxidase include hemG gene-deficient mutants SASX38 (Sasarman, A. et al. (1979) J. Gen. Microbiol. 113: 297-303 VSR751 (Nishimura, K. et al. (1995) J. Biol. Chem. 270: 8076-8080.) Is known!
- the total RNA of the plant can be extracted using known methods such as the RNA extraction method, for example, the guanidine method, the guanidine phenol method, the SDS phenol method, and the like.
- total RNA force conventional method extracted, c which can be purified mRNA by, for example, oligo-dT cellulose method
- Preparation of cDNA can be performed according to a conventional method such as the method described in the above-mentioned experimental book.
- double-stranded cDNA can be synthesized by the Okayama-Berg method, Gubler-Hoffman method, or the like.
- the cDNA can be ligated to a plasmid, ⁇ phage, or the like according to a conventional method to prepare a cDNA library.
- a vector for use a vector having a promoter such as lacZ or tac upstream of MCS (for example, a pUC-based plasmid or an Agtl-based phage) should be selected to prepare an expression-type cDNA library. And hope ,.
- a unidirectional library can be prepared by using a primer adapter or the like as a primer.
- the protoporphyrin-genoxidase gene was isolated by introducing the expressed cDNA library into a hemG (protoponoleylinogenoxidase gene) -deficient mutant strain of Escherichia coli and isolating a cDNA clone that complemented the growth. Can be cloned.
- the entire sequence of the cleaved gene can be determined by the Maxam's Guinolevate method or the Sanga method.
- Nucleotide sequence analysis software for example, Genetyx (SDC) and DNASIS (Hitachi Software Engineering), search for protein-encoding parts, and base sequence homology with known genes. Analysis can be performed.
- tobacco callus having a light-requiring herbicide-resistant mechanism is not necessarily a cDNA library when the protoporphyrinogen oxidase gene is cloned. Can be cloned relatively easily by PCR without the necessity of constructing and performing the genetic complementation method. From the nucleotide sequence information of the tobacco chloroplast protovorphyrinogen oxidase gene identified in the present invention, a PCR primer capable of amplifying the entire open reading frame encoding protoporphyrinogen oxidase was designed.
- a light-requiring herbicide-tolerant plant By using the light-requiring herbicide-resistant protoporphyrinogenogenoxidase gene shown in the present invention, a light-requiring herbicide-tolerant plant can be produced. That is, a promoter that functions in a plant cell, a light-requiring herbicide-resistant protoponolefilinogenogenoxidase gene, and an expression cassette that functions in a plant cell as a terminator are incorporated into a suitable plasmid vector and For example, a gene transfer method such as agrobacterium terminus, electroporation to protoplasts, and particle gun method to plant tissue may be used, and an expression cassette may be introduced into plant cells to transform cells. Can be created. The resulting plants have an agriculturally useful trait of light demanding herbicide resistance. If expression cassettes having different genes are also used at the same time, the resistance to light-requiring herbicides expressed by the present gene and the traits thereof can be used as a key to the selection of transformed products. .
- Suitable plasmid vectors include the pBI plasmid and the pMO plasmid when the Agrobacterium method is used, and pUC plasmid and pBluescript plasmid when other methods are used. Plasmids and the like can be mentioned. Promoters that function in plants include the cauliflower mosaic virus (CaMV) 35S promoter and the like, and promoters that function in plants include the CaMV terminator. These are described in detail in the above-mentioned experiment book, for example, Plant Molecular Biology anua], Gelvin, S.A. et al. Kluwer Academic Publishers, 1991, 1995 (Second edition). Example
- Xanthi NC tobacco (Nicotiana tabacum var. Xanthi NC) grown to a total height of about 40 cm in a greenhouse was cut out, cut into 5 cm pieces using a scalpel, and then 70 ° /.
- the surface was sterilized by immersing in ethanol for 30 seconds in an aqueous solution of sodium hypochlorite (effective chlorine concentration 1%) for 30 minutes. After washing three times with sterile water, the epithelial cells are removed, and the enzyme solution (1% cellulase onozuka R-10 and 0.05% macerozyme R-10 (Yakunoreto)) 0.6 M mannitol (pH 5. 8) The suspension was carried out at 26 ° C for 3 hours.
- the amount of protoporphyrin IX in the obtained lower layer was measured from the value of Ex 405 nm-Em 631.5 nm with a fluorescence spectrophotometer. All extraction operations were performed under safe light.
- the amount of protoporphyrin IX was 1.3 g / g fresh weight after 24 hours for the sensitive strain and 48 hours after 1.9 ⁇ g / g fresh weight, 1.7 ⁇ g / g fresh weight after 24 hours and 4.6 ⁇ g / g fresh weight after 48 hours for ETR-056 strain Ponorefillin IX accumulation was observed.
- ETR-245 and ETR-253 strains accumulation of protoporphyrin IX was hardly recognized.
- Fomesafen (trade name: Flex) and oxadiazone (trade name: Lonsta-1), which accumulate protoporphyrin IX as a light demanding herbicide
- birazoxifene (trade name: Noisa-1), which causes bleaching with chlorophyll synthesis inhibitor
- DPX-84 Bialaphos (trade name: Pasta), Dalifosate (trade name: Roundup), Butachlor (trade name: Mashette), a protein synthesis inhibitor
- Propanil (trade name, an inhibitor of photosynthetic photosystem I) Stam) and paraquat (trade name: Pregrottas), which generates active oxygen with an inhibitor of photosynthetic photosystem II.
- each resistant strain was transplanted to an MS liquid medium containing each drug, and the minimum inhibitory concentration (MIC) was measured.
- MIC minimum inhibitory concentration
- both resistant strains showed strong resistance to fomesafen and oxaziazone, which accumulate protoporphyrin IX with the protoporphyrin monogenoxidase inhibitor.
- the ETR-056 strain also showed resistance to paraquat, and the ETR-253 strain also showed resistance to vilazoxifene, DPX-84 and dalifosate.
- the ETR-056 strain is resistant to reactive oxygen species due to overproduction of superoxide dismutase
- the ETR-253 strain is multidrug resistant due to decreased membrane permeability
- the ETR-245 strain is the target enzyme.
- the mutant strain was considered to be resistant due to overproduction of the target enzyme.
- the MIC of Compound A was measured for the susceptible strain and the ETR-056 ETR-245 and ETR-253 strains. As a result, the MIC for the susceptible strain was 5 nM, but the MIC for the resistant strain was 2400 nM or more, indicating that all the resistant strains showed strong resistance to Compound A. It became. Therefore, in the following examples, compound A was used as a light demanding herbicide, and ETR-245 strain was used as a resistant strain.
- the resulting supernatant was centrifuged at 4 000 ⁇ g for 15 minutes at 4 ° C., and the precipitate was dissolved in 2 nil of 20% glycerin.
- the tank mass of the obtained crude enzyme solution was measured with a protein measurement kit (Bio-Rad).
- reaction buffer 100 mM Tris-HCl (pH 7.6) ImM EDTA 5 mM DTT 0.03% Tween80
- the crude enzyme solution was added to a final concentration of 0.1 mg protein / ml. And heated slowly to room temperature. After heating, add protoporphyrinogen IX to a final concentration of 2 ⁇ M and add nitrogen.
- the reaction was started by replacing the gas phase with the gas. After 10 minutes from the reaction, the fluorescence for 30 minutes was monitored with a fluorescence spectrophotometer, and the enzyme activity was measured (Ex: 405 nm, Em: 631.5 nm).
- RNA fraction was obtained by Distilled water was added to the dried precipitate to dilute it to lmg / ml, 10M lithium chloride was added to a final concentration of 2M, and the mixture was allowed to stand on ice for 2 days. After standing, the precipitate was collected by centrifugation at 2,000 xg for 30 minutes at 4 ° C to obtain a total RNA fraction.
- RNA fraction Purification of mRNA of the total RNA fraction was performed using an oligo dT span column (Pharmacia) according to the attached instructions.
- the cDNA library was prepared using Superscript Lamda System (GIBC0 BRL). This kit can use a primer adapter during the first strand synthesis, and insert the resulting cDNA into the lacZ promoter of gt22A in the forward direction.
- GIBC0 BRL Superscript Lamda System
- ⁇ g of the mRNA obtained by the above method was used as type II, and subjected to cDNA first strand synthesis, cDNA second strand synthesis, adapter binding, restriction enzyme treatment, and column chromatography according to the instructions attached to the kit.
- phage particles were reconstituted using Gigapack Gold (Stratagene) according to the attached instructions.
- Primary library containing approximately 1.9 million independent clones -Was stained with Escherichia coli Y1090 (r-) strain, propagated, and stored as an amplification library.
- the form was added to a 4% closate, stirred well, allowed to stand at room temperature for at least 30 minutes, and centrifuged to obtain phage particles as a supernatant.
- the obtained phage particles were again stained with Escherichia coli Y1090 (r-) strain ⁇ 3 ⁇ 4g, and a single plaque was suspended in SM medium containing 4% black form.
- the recovered recombinant phage particles were reinfected with the SASX38 strain, and only those showing growth recovery ability were reselected.
- Amplification of the cDNA insert was performed by PCR. That is, the DNA contained in the collected recombinant phage particles was designated as type III, and Taq DNA polymerase (TAKARA EX Taq, Takara Shuzo), and a forward primer for gt22A (5'-ATT GGT GGC GAC GAC TCC TGG AG-3 ', SEQ ID NO: 4) and reverse primer (5'-CCA GAC C CTG GTA ATG GTA GCG-3', SEQ ID NO: 5) for 1.5 minutes at 94 ° C and 1.5 minutes at 69 ° C.
- One cycle consisting of 2 minutes of reaction at 72 ° C. for 30 minutes was performed for 30 cycles.
- pBluescript SK (-) (Stratagene), as described in the aforementioned protocol (eg, Current Protocols in Molecular Biology, Jhon Wiley & Sons, Ausubel, M. et al.), In a positive orientation to the lacZ promoter. That is, pBluescript SK (-) was recovered after digestion with EcoRV, and Taq DNA polymerase (TAKARA EX Taq, Takara Shuzo) was added thereto. The mixture was reacted with C for 2 hours, and T was added to the 3 'end of the plasmid.
- TAKARA EX Taq Takara Shuzo
- a competent cell of Escherichia coli XL-1 Blue 3 ⁇ 4 (Stratagene) prepared by the CaCl 2 method was transformed, and spread on a LB solid medium containing IPTG.Xgal and ampicillin at 37 ° C. Cultured overnight at C. After the culture, the white colonies with the inserts were selected and selected, and were subjected to shake culture in an LB liquid medium containing ampicillin, followed by preparation of a plasmid DNA by the alkaline lysis method.
- the obtained plasmid DNA was cleaved with a restriction enzyme, and a host Escherichia coli having a plasmid into which cDNA was inserted in a forward direction was selected.
- the resulting plasmid was named pBNtPX-1 (FIG. 1), and the selected host E. coli was supplemented with dalyserin to 15% and stored at -80 ° C.
- E. coli harboring pBNtPX-1 was cultured in LB liquid medium containing ampicillin, the plasmid was purified in large quantities by the cesium chloride method.
- the competent cell of Escherichia coli SASX38 strain prepared by the CaCl 2 method was transformed using the obtained plasmid.
- the transformed SASX38 strain was spread on an LB medium and cultured at 28 ° C. As a result, when pBNtPX-1 was used, a large number of large colonies in which growth had recovered was found in small colonies. As described above, the expression of protoponolefilinogenogenoxidase activity in Escherichia coli by pBNtPX-1 was confirmed.
- a dilution clone was prepared using a Deletion kit for Kilo-Sequence (Takara Shuzo) according to the attached instructions, and a Cycle Sequencing kit Ampl iTaq FS ( The nucleotide sequence was elucidated using Perkin-Elmer Co., Ltd.) and Photo-Quencher (ABI PRISM 310, Pakin-Elma Co., Ltd.) according to the attached instructions.
- this polypeptide is a dinucleotide binding domain (GXGXXG) conserved at the end of protoporphyrinogen oxidase in many organisms (Nishimura, K. et al. (1995) J. Biol. Chem. 270: 8076-8080)), which confirmed that it was protoporphyrinogen oxidase.
- Bacillus subtilis and animal protoporphyrinogen oxidase are also located upstream of this domain. While only ⁇ 11 amino acids are found, 77 amino acids are found in chloroplast protoporphyrinogen oxidase of tobacco, and in tobacco this is a transit peptide for chloroplasts. it was thought.
- Table 5 Comparison of amino acid sequences of chloroplast protoporphyrinogenogenoxidase in tobacco (upper) and Arabidopsis (lower) Homology: 75.9%
- Protoporphyrinogenoxidase gene is amplified by PCR using the obtained cDNA form. Tried that.
- the primers for PCR include forward primer (5′-GCG GTC TAC AAG TCA GGC ACT CAT-3 ′, SEQ ID NO: 6) and reverse primer (5′-CAT GCC AAT TTT CCC AAG GCA TGA TCG TAT T -3 ', SEQ ID NO: 7), 1 cycle of 94 ° C for 3 minutes, 94 ° C for 20 seconds and 61 ° in a thin wall tube with Taq DNA polymerase (TAKARA EX Taq, Takara Shuzo) C was performed for 30 cycles at 30 seconds, 72 ° C for 1 minute and 30 seconds, and 1 cycle at 72 ° C for 5 minutes.
- TAKARA EX Taq Takara Shuzo
- Plasmids into which the chloroplast-type protoporphyrin genoxidase gene from the susceptible strain or ETR-245 strain was inserted were named pCR-HC or pCR-RC ( Figure 2). % And glycerin was added thereto, and stored at -80C.
- the plasmids were purified in large amounts by the cesium chloride method.
- competent cells of Escherichia coli SASX38 strain prepared by the CaCl method were transformed.
- the transformed SASX38 strain was spread on an LB medium and cultured at 28 ° C. As a result, when any of the plasmids was used, a large number of recovered and large forces were observed in a small colony.
- pCR-HC and pCR-RC were used to express protoponolerefrininogen oxidase activity in Escherichia coli.
- the Escherichia coli SASX38 strain containing the above two plasmids was cultured with shaking at 28 ° C overnight in LB liquid medium containing 50 ⁇ g / ml ampicillin. After measuring the OD 600, 50 ⁇ g / ml ampicillin and 0 1 10 100 1, 000 2 000 5 000 is Les, the compound-free LB liquid medium 10, OOOnM, the same 0D 6 ⁇ value And shaking culture at 28 ° C. Over time some collected, microplate one tri one loaders (MTP - 120, corona electric Co.) to measure the 0D 530 with, made the growth of E. coli in the control group (Compound A onm) 50% Hinder The concentration (IC 50 ) was calculated.
- pCR-HC is les, in the pCR-RC-free E. coli, the IC 50 respectively about 2. 5 nM some les, becomes 10, OOOnM above, R / S ratio (resistance-type IC 5Q Z wild type IC 5 )) was 4,000 or more. Incidentally, 10, medium cloudy in OOOnM above, it was impossible to measure the OD 530. Based on the above results, the mechanism of compound A resistance in the ETR-245 strain indicates that the chloroplast-type protoporphyrinogenogenoxidase gene is mutated to a light-requiring herbicide-resistant type due to some mutation in the gene. It was thought to be.
- the light-required herbicide-resistant protoporphyrin monogenoxidase gene (pAraC-) described in WO 95/34659, described in WO95 / 34659, is a mutation of alanine, which is the 220th amino acid, to a phosphorus. lVal).
- the cDNA in the resulting plasmid was subcloned again into pBluescript SK (-), and the entire nucleotide sequence of the cDNA was elucidated. It was confirmed that the target nucleotide sequence was obtained.
- the resulting light-required herbicide-resistant plasmid was named pBAtPX-RC (FIG. 3).
- Escherichia coli SASX38 strain carrying pCR-HC containing wild-type tobacco protoporphyrinogenogenoxidase gene of tobacco, and tobacco-resistant protoporphyrinogenoxidase gene of tobacco are included PCR-RC-bearing Escherichia coli SASX38 strain, Arabidopsis wild-type protovorphyrin monogenoxidase gene-containing pBAtPX-C-bearing E. coli SASX38 strain and Arabidopsis thaliana Using SASX38 strain E.
- pCR-H which carries the tobacco wild-type protoporphyrinogenoxidase gene
- pCR-RC which carries the tobacco resistant protoporphyrinogenoxidase gene and Arabidopsis wild-type protoporphyrinogenoxidase Retain genes
- pBAtPX-C and pBAtPX-RC carrying Arabidopsis resistant protoporphyrinogen oxidase gene was cleaved with Xhol, and blunt-ended with a Klenow fragment of DNA polymerase I (Takara Shuzo).
- the fragment was separated into a protoponolefilinogenogenoxidase gene fragment and a plasmid fragment by agarose gel electrophoresis, and a protoporphyrinogenoxidase gene fragment was recovered.
- Plasmid fragments derived from the obtained pBI121 and the proto port Honoré Philippines Roh one Geno Kishida Ichize gene fragment was Raige one Chillon with DNA Ligation Kit (Takara Shuzo Co., Ltd.), Competent of E. coli HB101 strain was produced by the CaCl 2 method The senor was transformed, spread on an LB solid medium containing kanamycin, and cultured at 37 ° C for a whole time.
- plasmid DNA was prepared by the alkaline lysis method.
- the obtained plasmid DNA was digested with restriction enzymes, and Escherichia coli having a plasmid into which each protoporphyrinogen oxidase gene was inserted was selected.
- the wild type of tobacco is a binary vector containing the resistant protoporphyrinogenoxidase-zetase gene inserted into the pBI-NtPX-HC, respectively, the pBI-NtPX-RC (Fig.
- the binary vector into which the resistant or resistant protoponolehuirinogen oxidase gene was inserted was named pBI-AtPX-HC or pBI-AtPX-RC (Fig. 5), respectively. Glycerin was added thereto and stored at -80 ° C.
- the four kinds of the above-mentioned nocturnal inarii vectors were introduced into Agrobacterium tumefaciens strain LBA4404 (Clontech) by the triparental mating method. That is, E. coli HB101 strain carrying a binary vector, E. coli strain HB101 which holds the helper phage P RK2013 (Clontech, Inc.) and A. tumefaciens LBA4404 strain NB agar medium (0. 8% Nutrient broth, 1. 5% bacterial medium After culturing for 2 days at 28 on agar (Wako Pure Chemical Industries), the three were mixed well and cultured at 28 ° C for another 2 days.
- the leaf disk was allowed to stand on a 0.6% agar-containing MS solid medium supplemented with 2 ppm of NM and 0.2 ppm of BA with the leaves upside down, and cultured at 25 ° C. for 48 hours.
- the leaf disk was transferred to an MS liquid medium supplemented with 500 ppm of carbenicillin and 200 ppm of claforan ⁇ r ⁇ , 2 ppm of NM and 0.2 ppm of BA, and cultured with shaking at 27 ° C for 48 to 72 hours. tumefaciens was removed.
- genomic DNA was extracted and purified from the leaves of the transformed plant by the CTAB method.
- Taq DNA polymerase TAKARA EX Taq, Takara Shuzo
- forward primer for Ca V 35S promoter 5′-CAC AGA TGG TTA GAG AGG CTT ACG CAG-3 ′, SEQ ID NO: 9
- N0S terminator reverse primer 5'-TCA TCG CM GAC CGG CM CAG GAT TCA-3, SEQ ID NO: 10
- N0S terminator reverse primer 5'-TCA TCG CM GAC CGG CM CAG GAT TCA-3, SEQ ID NO: 10 in a thin wall tube at 94 ° C for 3 minutes, 1 cycle, 94 ° C 30 cycles of 20 seconds, 62 ° C, 30 seconds and 72 ° C, 3 minutes.
- Leaves of approximately the same leaf position were collected from the transformed, non-transformed body and the non-transformed body after the confirmation of the transgene, and leaf disks having a diameter of 9 mm were prepared. 0, 125, 250, 500, 1 , 250, 2, 500, 5,000, 12,500 nM floating on a Petri dish containing Compound A aqueous solution. After culturing at 27 ° C under continuous strong light for one week, the whitening degree of the leaf disk was observed, and the allowable concentration of Compound A was calculated.
- Tobacco wild type (pBI—NtPX-HC) 500n X 4 Tobacco t-type (pB to NtPX-RC)> 12,500n, VI> X 100
- protoporphyrinogen oxidase which is resistant to a light-requiring herbicide derived from tobacco.
- protoporphyrinogen oxidase which is resistant to a light-requiring herbicide derived from tobacco.
- a plant highly resistant to light-requiring herbicides is expressed by expressing the enzyme in a host plant. It is possible to create
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Application Number | Priority Date | Filing Date | Title |
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CA002303403A CA2303403A1 (en) | 1997-09-11 | 1998-09-10 | Novel protoporphyrinogen oxidase tolerant to photobleaching herbicide |
US09/508,418 US6905852B1 (en) | 1997-09-11 | 1998-09-10 | Herbicide-resistant protoporphyrinogen oxidase isolated from Nicotiana tabacum |
EP98941798A EP1020525A4 (en) | 1997-09-11 | 1998-09-10 | PROTOPORPHYRINOGEN OXIDASE, WHICH IS TOLERANT TO HERBICIDES NEEDING LIGHT |
AU90011/98A AU741013B2 (en) | 1997-09-11 | 1998-09-10 | Novel protoporphyrinogen oxidase tolerant to light-requiring herbicides |
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JP26508497 | 1997-09-11 | ||
JP9/265084 | 1997-09-11 |
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PCT/JP1998/004064 WO1999013087A1 (fr) | 1997-09-11 | 1998-09-10 | Nouvelle protoporphyrinogene oxydase tolerante vis-a-vis des herbicides necessitant de la lumiere |
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US (1) | US6905852B1 (ja) |
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WO2001036606A2 (de) * | 1999-11-16 | 2001-05-25 | Basf Plant Science Gmbh | Protoporphyrinogen-ix-oxidase und seine verwendung |
JP2015519913A (ja) * | 2012-06-19 | 2015-07-16 | ビーエーエスエフ アグロ ベー.ブイ. | 除草剤に対する増加した耐性を有する植物 |
JP2021168691A (ja) * | 2015-08-03 | 2021-10-28 | モンサント テクノロジー エルエルシー | 植物における除草剤耐容性のための方法及び組成物 |
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JP4720223B2 (ja) | 2004-05-18 | 2011-07-13 | 住友化学株式会社 | 除草活性化合物耐性植物 |
AU2015271948A1 (en) * | 2010-08-03 | 2016-01-21 | Cibus Europe B.V. | Mutated protoporphyrinogen IX oxidase (PPX) genes |
US20120122223A1 (en) | 2010-08-03 | 2012-05-17 | Cibus Us Llc | Mutated protoporphyrinogen ix oxidase (ppx) genes |
UA112969C2 (uk) | 2010-08-03 | 2016-11-25 | Сібас Юс Ллс | Рослина, стійка до одного або більше ррх-інгібуючих гербіцидів, яка містить мутантний ген протопорфіриноген ix оксидази (ррх) |
JP6334169B2 (ja) | 2010-12-16 | 2018-05-30 | ビーエーエスエフ アグロ ベー.ブイ. | 除草剤耐性の増大した植物 |
US10041087B2 (en) | 2012-06-19 | 2018-08-07 | BASF Agro B.V. | Plants having increased tolerance to herbicides |
EP3033419A4 (en) | 2013-08-12 | 2017-07-05 | BASF Agro B.V. | Plants having increased tolerance to herbicides (ppo) |
UY35701A (es) | 2013-08-12 | 2015-02-27 | Basf Se | Plantas que tienen una mayor tolerancia a herbicidas inhibidores de la protoporfirinógeno oxidasa (ppo) |
US10378023B2 (en) * | 2015-09-01 | 2019-08-13 | Monsanto Technology Llc | Methods and compositions for herbicide tolerance in plants |
CN109475099A (zh) | 2016-07-29 | 2019-03-15 | 孟山都技术公司 | 用于在植物中进行基因表达的方法和组合物 |
Citations (1)
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WO1997032011A1 (en) * | 1996-02-28 | 1997-09-04 | Novartis Ag | Dna molecules encoding plant protoporphyrinogen oxidase and inhibitor-resistant mutants thereof |
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1998
- 1998-09-10 CA CA002303403A patent/CA2303403A1/en not_active Abandoned
- 1998-09-10 AU AU90011/98A patent/AU741013B2/en not_active Ceased
- 1998-09-10 EP EP98941798A patent/EP1020525A4/en not_active Withdrawn
- 1998-09-10 US US09/508,418 patent/US6905852B1/en not_active Expired - Fee Related
- 1998-09-10 WO PCT/JP1998/004064 patent/WO1999013087A1/ja not_active Application Discontinuation
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WO1995034659A1 (en) * | 1994-06-16 | 1995-12-21 | Ciba-Geigy Ag | Manipulation of protoporphyrinogen oxidase enzyme activity in eukaryotic organisms |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001036606A2 (de) * | 1999-11-16 | 2001-05-25 | Basf Plant Science Gmbh | Protoporphyrinogen-ix-oxidase und seine verwendung |
WO2001036606A3 (de) * | 1999-11-16 | 2001-11-15 | Basf Plant Science Gmbh | Protoporphyrinogen-ix-oxidase und seine verwendung |
JP2015519913A (ja) * | 2012-06-19 | 2015-07-16 | ビーエーエスエフ アグロ ベー.ブイ. | 除草剤に対する増加した耐性を有する植物 |
JP2018186826A (ja) * | 2012-06-19 | 2018-11-29 | ビーエーエスエフ アグロ ベー.ブイ. | 除草剤に対する増加した耐性を有する植物 |
JP2021168691A (ja) * | 2015-08-03 | 2021-10-28 | モンサント テクノロジー エルエルシー | 植物における除草剤耐容性のための方法及び組成物 |
Also Published As
Publication number | Publication date |
---|---|
AU741013B2 (en) | 2001-11-22 |
CA2303403A1 (en) | 1999-03-18 |
US6905852B1 (en) | 2005-06-14 |
AU9001198A (en) | 1999-03-29 |
EP1020525A1 (en) | 2000-07-19 |
EP1020525A4 (en) | 2004-08-25 |
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