WO1996006926A1 - Procede pour produire de la l-valine et de la l-leucine - Google Patents
Procede pour produire de la l-valine et de la l-leucine Download PDFInfo
- Publication number
- WO1996006926A1 WO1996006926A1 PCT/JP1995/001719 JP9501719W WO9606926A1 WO 1996006926 A1 WO1996006926 A1 WO 1996006926A1 JP 9501719 W JP9501719 W JP 9501719W WO 9606926 A1 WO9606926 A1 WO 9606926A1
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- Prior art keywords
- dna
- valine
- microorganism
- gene
- strain
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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
- 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
- C12N15/70—Vectors or expression systems specially adapted for E. coli
-
- 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
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/06—Alanine; Leucine; Isoleucine; Serine; Homoserine
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/08—Lysine; Diaminopimelic acid; Threonine; Valine
Definitions
- the present invention relates to a microorganism belonging to the genus Escherichia having an ability to produce L-valine or L-bit isine, and more particularly, to a microorganism having enhanced L-valine or L-bit isine production ability.
- L-valine and L-leucine are mainly produced by a fermentation method using L-valine or L-one-mouth isine-producing bacteria belonging to the genus Brevibacterium, Corynebacterium cteridium or Serratia, or mutants thereof. (Amino Acid Fermentation, Gakkai Shuppan Center, pp. 379-422, 1989). Although the productivity of these amino acids has been considerably increased by conventional methods, in order to respond to the further increase in demand for L-valine and L-mouth cinnamate in the future, more inexpensive and efficient production methods will be required. Development is required.
- microorganisms belonging to the genus Escherichia may be used as L-valine or L-leucine-producing bacteria, which are excellent due to their rapid growth rate, how to proceed with gene analysis, and abundance of genetic material.
- L-valine or L-leucine-producing bacteria which are excellent due to their rapid growth rate, how to proceed with gene analysis, and abundance of genetic material.
- the present inventors have conducted intensive studies on the productivity of L-valine and L bite-isine by mutant strains of microorganisms belonging to the genus Escherichia and found that lipoic acid was required for growth. It has been found that the required mutation and / or the mutation deficient in H + -ATPase enhances the ability of L-nocrine or L-single-isine-producing bacteria to produce these amino acids, thereby completing the present invention.
- the first microorganism of the present invention is a microorganism belonging to the genus Escherichia having L-valine or L-mouth isin-producing ability, which is characterized by requiring lipoic acid for growth.
- the second microorganism of the present invention is a microorganism belonging to the genus Escherichia, which has an ability to produce L-palin or L-lipe isine, and is characterized by lacking H + -ATPase.
- the third microorganism of the present invention is a microorganism belonging to the genus Escherichia capable of producing L-valine or L-mouth isine, which requires lipoic acid for growth and lacks H + -ATPase. It is a microorganism characterized by the following.
- the present invention also provides a method for producing L-valine or L-mouth isine, which comprises culturing the microorganism in a liquid medium, producing and accumulating L-valine or L-mouth isine in the culture medium, and collecting the L-valine or L-mouth isine. Provide the law.
- ⁇ + - ⁇ ase deficiency means that the cells do not substantially express H + -ATPase activity, and the atp operon encoding eight types of H + -ATPase subunits. If the gene expression does not occur due to the whole or partial deletion or fragmentation of H + -ATPase, and the H + -ATPase protein expressed from the H + -ATPase gene does not have H + -ATPase activity. This includes any substitution, insertion or deletion of one or more nucleotides in the transgene.
- the i 1 vGMEDA operon refers to one having at least each of the following genes: i 1 vG, i 1 vM, i 1 vE, and i ⁇ v D, and has no activity ⁇ expresses a threonine deaminase ⁇ This includes those with the J_ gene or those that do not have the i1VA gene in principle.
- the microorganism of the present invention is a microorganism belonging to Escherichia coli having an ability to produce L-valine or L-isocyanate, and has any of the following properties. 1 Request lipoic acid for growth.
- Microorganisms having such a property include mutations requiring lipoic acid for growth (hereinafter referred to as “lipoic acid-requiring mutations”) or natural and H + -ATPa, due to natural or artificial mutation.
- lipoic acid-requiring mutations mutations requiring lipoic acid for growth
- H + -ATPa se deficient mutation A microorganism belonging to the genus Escherichia to which a mutation deficient in se (hereinafter referred to as “H + -ATPa se deficient mutation”) has been imparted with L-valine or L-mouth isine-producing ability, or L-valine of the above mutant strain Alternatively, it can be obtained by enhancing the ability to produce L-leucine.
- microorganism of the present invention can also be obtained by introducing a lipoic acid auxotrophic mutation and / or an H + -ATPase deficient mutation into a microorganism belonging to the genus Escherichia having L-valine or L-lipid isine-producing ability. can get.
- microorganisms used for obtaining the above microorganisms include microorganisms belonging to the genus Escherichia such as Escherichia coli (hereinafter also referred to as “£. Colij”) and non-pathogenic strains. Specific examples include the following strains: Escherichia coli K-12 (ATC C 10798)
- Escherichia coli W1485 (ATCC 12435)
- a mutation into a microorganism belonging to Escherichia coli can also be performed by other genetic methods, for example, a gene recombination method, a transduction method, a cell fusion method and the like.
- lipoic acid auxotroph (hereinafter referred to as “lipoic acid auxotroph”) is obtained by culturing the mutated cells on an agar plate medium and separating colonies that have become lipoic acid auxotrophic. (A. Herbert and JR Guest: J. Gen. Microbiol., 53, 363-381 (1968)).
- lipoic acid-requiring strain include coli W14851ip2 (ATCC25645).
- H + -ATPase deficient mutants cannot grow on an agar plate medium containing succinic acid as the sole carbon source among the mutated strains. Is obtained by obtaining a mutant strain capable of growing on a plate medium using as a sole carbon source, and obtaining a H + -ATPase-deficient strain from among these.
- Specific examples of the H + -ATPase-deficient strain include E. coli AN718CE (E. coli Genetic Stock Center, Yale University ⁇ Department of Biology) and the like.
- H + -ATPase is a complex assembly of eight types of subunits: about 500,000 membrane-bound enzymes, and a pump function that excretes H + out of the membrane by changing the free energy generated by hydrolyzing ATP. It has the function of synthesizing ATP using the H + concentration gradient across the membrane generated by intracellular respiration.
- this enzyme is divided into F0 fraction, which is integral with the membrane and has H + transport activity, and F1 fraction, which is superficially membrane and catalyzes the degradation and synthesis of ATP.
- Three kinds of c, F1, consist of five kinds of subunits: ⁇ ,, 5, and £. Any of these mutant strains can be used as a ⁇ + — ATPase-deficient strain.
- the H + -ATPase deficient mutation may be one that expresses a mutant subunit or one in which H + -ATPase-forming subunit is not expressed due to a mutation in a promoter site or the like.
- H + — ATPase inhibitors, TCA cycle inhibitors, respiratory chain inhibitors be particular cowpea adding various drugs such as uncoupling agents to the culture medium H + - ATP ase deficiency and as this c the same effect can be expected to be obtained H + - the AT Pa se inhibitors Dicyclohexylcarpoimidide, triptyltin, o-bitertin, etc., TCA cycle inhibitors such as malonic acid, monoiodoacetic acid, methyl violet, 2,4-dinitrophenol, etc., and electron transport inhibitors such as tenol Trifluoroacetone.
- droxyquinoline-N-oxide, antimycin, and uncouplers examples include valinomycin, atebulin, 4,5,6,7-tetrafluoro-2-trifluoromethylbenzimidazole and the like. These inhibitors may be used alone or as a mixture of two or more.
- lipoic acid auxotroph obtained as the as a parent strain further mutagenesis by selecting a strain deficient in H + -ATP ase, or H + -ATP ase deficient strain as a parent strain And a strain that has become lipoic acid-requiring and a mutant having both the lipoic acid-requiring mutation and the H + -ATPase-deficient mutation (hereinafter referred to as “lipoic acid-requiring H + -ATP ase-deficient strain).
- Mutants having both the lipoic acid auxotrophic mutation and the H + _ATPase deficient mutation can be transformed into a mutant having one of these mutations by transduction, transformation, cell fusion, or the like. It can also be obtained by introducing.
- a lipoic acid-requiring-H + -ATPase-deficient strain can be obtained by introducing a lipoic acid-requiring strain as a parent strain and introducing an H + -ATPase-deficient mutation into the strain.
- the parent strain is the above-mentioned W1485 1 ip2 strain
- the donor strain of the H + -ATPase deficient mutation is the above strain AN 718.
- the H +-ATPase deficient strain is used as the parent strain, and By transducing a lipoic acid auxotrophic mutation, a lipoic acid auxotrophic H + -ATPase-deficient strain can also be obtained.
- Examples of the lipoic acid auxotrophic ATPase deficient mutant obtained as described above include £. Coli AJ12631. AJ12631 was deposited on July 24, 1991 with the Ministry of International Trade and Industry at the National Institute of Advanced Industrial Science and Technology under the accession number FERM P-12381.On August 29, 1995, the international deposit was made under the Budapest Treaty. Has been assigned a FERM BP-5209 accession number.
- the microorganism of the present invention may be a lipoic acid-requiring mutant or a ⁇ + —ATPase-deficient mutant or a lipoic acid-requiring H + —ATPase-deficient mutant of a microorganism belonging to Pseudomonas X. — It can be obtained by imparting the ability to produce halin or L- mouth isine, or by enhancing the ability of the mutant strain to produce L-norin or L-mouth isin.
- the microorganism of the present invention can be obtained by introducing a lipoic acid-requiring mutation or an H + -ATPase-deficient mutation into a microorganism belonging to the genus Escherichia having L-monophosphoric acid or L-lipid isin-producing ability. Is also obtained.
- L-valine or L-bite isine raw Even for microorganisms with low productivity, the ability to produce L-valine or L-mouth isine can be increased by introducing a lipoic acid-requiring mutation or an H +-ATPase deficient mutation.
- L-18'-lin producing bacteria are lipoic acid-requiring mutants or H + -ATPase-deficient mutants or lipoic acid-requiring H + -ATPase-deficient mutants of microorganisms belonging to the genus Escherichia.
- the mutant is obtained by imparting L-parin-producing ability or enhancing the L-parin-producing ability of each of the mutant strains.
- the L-parin production ability is imparted or enhanced by, for example, introducing a L-valine biosynthesis gene whose control mechanism has been substantially released into a microorganism belonging to the genus Escherichia. Further, a mutation may be introduced so that the control mechanism of the L-valine biosynthesis gene held by the microorganism belonging to Escherichia coli is substantially released.
- the reaction at the final stage of biosynthesis of L-valine is carried out by the enzymes encoded by the i1vGMEDA operon.
- the i1v GME DA operon has the following genes: iIvG, i1vM, i1vE, i1vD, i] ⁇ . It encodes large and small subunits of Sozym II, transaminase, dihydroxyacid dehydratase, and threonine kinase. Of these enzymes, acetate hydroxyacid synthase, transaminase and dihydroxyacid dehydratase catalyze the synthetic pathway from pyruvate to L-parin and from 2-ketobutyric acid to L-isoisocyanate.
- Threonine deaminase catalyzes the deamination of L-threonine to 2-ketobutyric acid, which is the rate-limiting step in the biosynthesis of L-iso-isocyanate. Therefore, it is preferable to use an operon that does not express threonine deaminase activity in order to efficiently promote the reaction of the L-parin synthesis system.
- the i1V GME DA operon that does not express threonine deaminase activity has a mutation that causes loss of threonine deaminase activity in i1VA or destroys i1VA.
- the deleted i 1 v GME DA operon or i 18 was deleted; including the 1 v GME D operon.
- the i 1 V GME DA operon is composed of L-valine and Z or L-isoleucine. And the operon expression is regulated by Z or L bite-isine, so that the region required for attraction is removed or mutated in order to release the suppression of L-valine expression. Is preferred.
- the i1vGMEDA operon that does not express threonine deaminase activity and has been released from attenuation should be modified by mutating the wild-type i1vGMEDA operon or using genetic recombination technology. Is obtained by
- Examples of the i 1 V GMEDA operon include those derived from a bacterium belonging to the genus Escherichia, and in particular, those derived from £ 1 coU.
- the bacterium belonging to the genus Escherichia is not particularly limited, and specific examples thereof include Neidhardt, FC et. Al., Escherichia coli and Salmonella tvphimurium, American Society for Microbiology, Washington DC. 1208, table 1. Things are available.
- a wild-type strain is used as a donor of a DNA containing the i1vGMEDA operon, a DNA containing the wild-type i1V GMEDA operon is obtained.
- the K-12 wild strain is active isoacetate II (AHASII), an active acetate hydroxyacid synthase, because the J_L ⁇ gene has a frameshift mutation. Is not expressed (Proc. Natl. Acad. Sci. USA 7S, 922.1991). Therefore, when using the K-12 strain as a DNA donor, prepare a mutant strain whose frame has been restored so that the activity of acetate hydroxyacid synthase II encoded by the i1vG gene is restored. The mutant strain must be used as a DNA donor.
- a gene other than the strain derived from the K-12 strain may be used as a DNA donor bacterium to singulate the transgene alone and then introduced into the i1V GMEDA operon derived from the K-12 strain. That is, the i1 vMEDA portion was singulated using the K-12 strain as a DNA donor, and only ⁇ ⁇ _ ⁇ gene was used as a DNA donor using £ . ⁇ 2 ⁇ other than the strain derived from the K-12 strain. The two are connected to form the full-length i 1 V GM EDA operon.
- isozyme II (AHASII) of acetate hydroxy acid synthase is composed of two large and small subunits, and the large subunit is encoded by the i1VG gene. The small subunit is coded for the i1vM gene.
- the method for obtaining the i 1 vGMEDA operon with the release of Athens is as follows.
- the position and nucleotide sequence of the attenuator located in the 5 'upstream region of the i 1 v GMED A operon have been reported by RP Lawther et al. (Nucleic Acids Res. 15.2137 (1987)).
- the nucleotide sequence described as SEQ ID NO: 1 in the sequence listing is a sequence containing a promoter, an attenuator, and an i1 vG gene coding region in the nucleotide sequence of the i1vGMEDA operon. Contains.
- the amino acid sequence encoded by the i1vG gene is shown in SEQ ID NO: 2.
- the DNA sequence from 966 to 971 encodes the contiguous portion of the two leucine residues present in the leader peptide, and the DNA sequence from 999 to 1007 is present in the leader peptide 3
- DNA sequences from positions 1008 to 1016 encode a contiguous portion of the three isoloicin residues present in the leader peptide.
- the DNA sequence from position 1081 to position 1104 encodes a part of a row-independent terminator uniform stem loop in the attenuator.
- RNA is transcribed from the DNA sequence from positions 1081 to 1104. Because of the formation of a / loop, transcription by RNA polymerase is terminated and i1V GMED A operator is not expressed.
- L-valine is deficient in the cell
- L-valine-bound tRNA is deficient in the cell
- ribosome translation is performed at a continuous portion of valine residues in the leader peptide coding region. Stagnates.
- the mRNA forms a new three-dimensional structure, and as a result, the row-independent terminator formed by RNAs transcribed from the DNA sequence from the 1081th to the 1104th is uniform. No more Stem loops are formed.
- transcription by RNA polymerase continues and the i 1 V GMED A operon is expressed.
- L-isoleucine or L bite The i 1 vGMEDA operon is similarly expressed when isin is deficient.
- the NA sequence or the DNA sequence from positions 1081 to 1104 may be removed.
- the sequence from 966 to 971 of the sequence disclosed in SEQ ID NO: 1 in the sequence listing is similarly removed. It is good to remove the DNA sequence or the DNA sequence from the 1081th position to the 1104th position.
- the mutation is not limited to one that removes all the attenuators present in the 5 'upstream of the i 1 vGMEDA operon.
- the mutation may be such that the attenuator cannot form a row-independent terminator uniform stem loop.
- the mutation may be such that the leader peptide does not contain a continuous portion of palin residues.
- a mutation may be used that does not include a continuous portion of leucine residues in the leader peptide. In any of the above cases, the actuation will not work.
- the removal of the area necessary for the attenuator includes removing all, a part, or a portion of the attenuator existing in the 5 'upstream region of the i 1 vGMED A operon, and newly removing the area inside the attenuator. Insertion of a unique DNA fragment is also included.
- coli for example, coli K-12 strain, E. coli W3110 strain, coli MCI 061 strain (in these three strains, JJL L £ has undergone a frame shift), g. Coli ⁇ 162 ⁇ * (thr-10, car -94, Sue, relAl, ilvG603, thi-1) and E. coli (the above two strains have normal i1vG) to obtain a culture.
- the above microorganisms may be cultured by an ordinary solid culture method, but it is preferable to employ a liquid culture method in consideration of the efficiency at the time of collection.
- the cultivation is carried out by submerged aeration and shaking, shaking cultivation or static cultivation for 30 to 42, preferably about 37 to 4 to 24 hours.
- the £ .geUliI162 strain is available from the E. coli Genetic Stock Center (Connecticut, USA). The index number for this strain is CGSC5919. The detailed properties of this strain are described in Mol. Gen. Genet. 143, 243 (1976), J. Bacteriol., 149, 294 (1982).
- the culture thus obtained is centrifuged at, for example, 3.000 r.p.m. for 5 minutes to obtain E. eel cells. From these cells, methods such as the method of Saito and Miura (Biochem. Biophys. Acta., 72, 619 (1963)) and the method of KS Kirby (Biochem. J., 64, 405, (1956)) are used. Chromosomal DNA can be obtained.
- a chromosomal DNA library is prepared for single carp i1vGMEDA operon from the thus obtained staining DNA.
- chromosomal DNA is partially digested with an appropriate restriction enzyme to obtain a mixture of various fragments.
- restriction enzymes can be used by adjusting the degree of cleavage by adjusting the cleavage reaction time and the like.
- Sau3A I is allowed to act on chromosomal DNA at a temperature of 30 or more, preferably 37, at an enzyme concentration of 1 to 10 units / ml for various times (1 minute to 2 hours) to digest it.
- the cut chromosomal DNA fragment is ligated to a vector DNA that can be replicated autonomously in Escherichia coli bacterial cells to produce a recombinant DNA.
- a base sequence identical to that of the restriction enzyme Sau3AI used to cut chromosomal DNA was generated.
- DNA ligase preferably T4 DNA ligase is added thereto at a temperature of 4 to 16 and an enzyme concentration of 1 to 1.
- the DNA is allowed to act for 1 hour or more, preferably 6 to 24 hours, under the condition of 100 units Zml to obtain recombinant DNA.
- microorganisms of the genus Escherichia for example, E. coli M 1262 strain (leuB6, ilvI614.ilvH612.l, relAl, spoTl, ilvB619, ilvG603, ilvG605 (am) .thi-1) Acetohydroxy acid synthase deficient mutant, coli AB2070 strain (proA2, trp-3. HisC4, ilvE12.metE46.thi-1, ara- 9, lacYl or lacZ4.galK2.malAl.mtl-1.rpsL8 or rpsL9, ton -1. tsx-3. scan R, scan one, transaminase B-deficient mutants such as SUDE44) or U AB1280 strain,
- a chromosomal DNA library is prepared by transforming a dihydroxy acid dehydratase deficient mutant such as). This transformation was performed using the method of DM Morrison (Methods in Enzymology 68.
- the £. Coli MI262 strain is available from the coli Genetic Stock Center (Connecticut, USA). The index number of the strain is CGSC5769. The detailed properties of this strain are described in Mol. Gen. Genet, 156.1 (1977).
- the £. Coli AB2070 strain is available from the coli Genetic Stock Center (Connecticut, USA). Its index is CGSC2070. The detailed properties of this strain are described in J. Bacteriol., Plate 730 (1972).
- Creating a recombinant DNA by linking to NA and using the recombinant DNA to create a chromosomal DNA library can obtain DNA fragments containing the target gene more efficiently. Can be.
- a strain having high dihydroxyacid dehydratase activity or a strain having complemented auxotrophy due to dihydroxyacid dehydratase gene deficiency was selected, and recombinant DNA containing i_L ⁇ gene was selected.
- a candidate strain with recombinant DNA containing the iJ_L ⁇ M gene retains the recombinant DNA from which the i1vGM gene has been cloned
- prepare a cell extract from the candidate strain It can be achieved by preparing a crude enzyme solution therefrom and confirming that the acetate hydroxy acid synthase activity is high.
- the enzyme activity of acetate hydroxysynthase can be measured by the method of MD Felice et al. (Methods in Enzymology 166.241).
- nucleotide sequence of DNA containing the iIV GM gene has already been reported by RP Lawther et al. (Nucleic Acids Res. 15, 2137 (1987)).
- confirmation can also be made by singulating the recombinant DNA from the candidate strain, decoding its base sequence, and comparing it with the base sequence described in the report.
- mutations occur in the open reading frame of the iIvG gene of the £. Coli K-12 strain. As a result, a frame shift occurs, and the translation ends because a codon appears throughout. That is, the stop codon appears at the 982 to 984th position from the ATG (1st to 3rd) of the start codon of the i1vG gene.
- i 1 v GM gene obtained from the same strain, it is necessary to restore the mutated portion to normal by the site 'directed mutagenesis method.
- the i1VG gene (ilvG603) of the Escherichia coli MI162 strain, two base pairs of TG are inserted before the stop codon TGA at positions 982 to 984, and the frame returns to normal. ing. Others are described in detail in Fig. 2 of J. Bacteriol. 149, 294 (1982).
- the method for confirming whether or not the candidate strain having the recombinant DNA containing the J_J_LJ_ gene retains the cloned recombinant DNA with the i1vE gene is as follows. Since a transaminase B-deficient mutant is required for isoleucine, when a transaminase B-deficient mutant is used as a host, a strain that does not contain isoloisin and can grow on a minimal medium can be isolated. By recovering the recombinant DNA from the strain, a DNA fragment containing the i1vE gene can be obtained. Or, ⁇ ! The nucleotide sequence of DNA containing the JLI gene has already been reported by RP Lawther et al.
- the method for confirming whether the candidate strain having the recombinant DNA containing the i1vD gene has the recombinant DNA in which the i1vD gene has been cloned is as follows. Since the dihydroxy acid dehydratase deficient mutant is required for isoleucine, leucine, and valine, when the dihydroxy acid dehydratase deficient mutant is used as a host, the strain capable of growing on a palin-free medium is unified. By recovering the recombinant DNA from the strain, a DNA fragment containing the i1VD gene can be obtained.
- the nucleotide sequence of the DNA containing the JJ_ ⁇ gene has already been reported by RP Lawther et al. (Nucleic Acids Res. 15, 2137 (1987)). So, the candidate It can also be confirmed by singulating recombinant DNA from the strain, decoding its nucleotide sequence, and comparing it with the nucleotide sequence reported in the same report.
- a DNA fragment having the i 1 V GM gene, a DNA fragment having the ⁇ _L J_ gene, and a DNA fragment having the upper gene are ligated.
- the entire nucleotide sequence of the i1v GMEDA operon which has already been reported by RP Lawther et al. (Nucleic Acids Res. 15. 2137 (1987)), can be referred to.
- a chromosome DNA was prepared from a strain having the wild-type i 1 vGMED A operon on the chromosome by the method of Saito, Miura, etc., and the polymerase chain reaction method (PCR: polymerase) Chain reaction; White, TJ et al; Trends Genet. 5, 185 (1989)), and can also be performed by amplifying the i 1 v GMED A operon.
- PCR polymerase chain reaction
- a primer complementary to both 3 'ends of the DA duplex containing the entire region or a partial region of the i1V GMEDA operation is used.
- primer DNA was synthesized using the phosphoramidite method (Tetrahedron Letters, 22, 1 859 (1981)) and the like, using a commercially available DNA synthesizer (eg, DNA synthesizer model 380B manufactured by Applied Biosystems).
- the PCR reaction was performed using a commercially available PCR reaction device (PerkinElmer, Inc., DNA Thermal Cycler PJ2000, etc.) and using TaQ DNA polymerase (supplied by Takara Shuzo Co., Ltd.). Can be performed according to the method specified by
- the i1vGMEDA operon amplified by the PCR method is connected to a vector DNA capable of autonomous replication in Escherichia bacteria cells, and introduced into the Escherichia bacteria cells to introduce mutations into the JJ_A gene. In addition, the operation of removing the area necessary for the attenu- ation is difficult.
- the vector DNA to be used, the transformation method, and the method for confirming the presence of the i1vGMEDA operation are the same as those described above.
- the open J _ ⁇ _ gene Since a frame shift mutation exists inside the reading frame, it is necessary to restore this mutation to the normal state by site directed mutagenesis. If the E. coli MI 162 strain (thr-10, car-94. ⁇ relAl, ilvC603, thi-1) or E. coli sculpture is used as the DNA donor, the i1vG gene can be used as is. it can.
- the “attenuator” is a base sequence that forms a row-independent terminator uniform stem // loop. For example, the portion from the 1081th position to the 1104th position in the nucleotide sequence described in SEQ ID NO: 1 in the sequence listing.
- a DNA fragment upstream of athenyue part of the il vGMEDA operation and prepare the i1 vGMEDA operation lower than the attenuator part of the iGMVDA operation.
- the DNA fragment of the basin may be prepared and ligated.
- a DNA fragment in the upstream region of the attenuator unit can be prepared by cleaving a DNA fragment containing the full-length i1V GMEDA operon with an appropriate restriction enzyme.
- a DNA fragment in the upstream region from the attenuator unit may be amplified by the PCR method.
- the primer DNA used in the PCR method has already been reported by RP Lawther et al. (Nucleic Acids Res. 15, 2137 (1987)).
- the nucleotide sequence has already been reported by G. Coppola et al. (Gene SI, 21 (1991)) It may be chemically synthesized based on the base sequence.
- a DNA fragment of the i 1 vGMEDA operon in the upstream region from a part of the ate niyu may be chemically synthesized.
- the i 1 vG 1_ ⁇ operon may be obtained by preparing the i 1 vGMEDA operon from which a part of the attenuator or a part in the vicinity has been removed.
- the position and base sequence of the attenuator have already been reported by R. P. Lawther et al. (Nucleic Acids Res. 15, 2137 (1987)), and DNA to be removed is determined based on this sequence.
- the DNA to be removed may be a portion of the DNA necessary for the attenuator to form a row-independent terminator uniform stem loop, or a region encoding a continuous valine residue located upstream of the stem no loop.
- An appropriate DNA portion containing the DNA or a DNA portion containing both are preferred.
- To remove a part or neighborhood of the attenuator prepare a DNA fragment upstream of the DNA part to be removed from the i1vGMEDA operon, and remove the DNA fragment from the i1vGMEDA operon.
- the DNA fragment may be prepared downstream of the DNA portion to be ligated.
- a DNA fragment upstream of the portion of the DNA removed from the i1vGMEDA operation can be prepared by cleaving a DNA fragment containing the full-length i1vGMEDA operation with an appropriate restriction enzyme.
- i 1 vGMEDA operon The DNA fragment upstream of the DNA portion to be removed may be amplified by the PCR method.
- the primer DNA used in the PCR method has already been reported by RP Lawther et al. (Nucleic Acids Res. 15, 2137 (1987)) and has already been reported by G. Coppola et al. (Gene I, 21 (1991)) It may be chemically synthesized based on the base sequence.
- a DNA fragment in the upstream region of the DNA portion to be removed in the i 1 vGMEDA operon may be chemically synthesized.
- an i 1 V GMEDA operon may be obtained by preparing an i 1 V GMEDA operon in which a new DNA fragment has been inserted inside the attenuator. Since the position and nucleotide sequence of the attenuator have already been reported by RP Lawther et al. Or G. Coppola et al., The insertion position of the new DNA fragment inserted based on this sequence and the Determine the nucleotide sequence.
- the new DNA fragment to be inserted may be a DNA fragment necessary for the rat to form a row-independent terminating Stemno loop, or a continuous DNA fragment located upstream of the Stemno loop. It is preferably inserted into the DNA portion encoding the valine residue. As a result of the insertion, the attenuator may not be able to form a row-independent terminator-like stem loop, and it is expected that the attenuator will not function.
- the nucleotide sequence of the new DNA fragment to be inserted was designed so that when it was inserted, it did not form a row-independent terminator uniform stemno loop. It is preferable that the valine residue is designed not to be located upstream of the loop.
- a DNA fragment upstream of the DNA portion into which the new DNA fragment is to be inserted in the 1 V GM ⁇ A operon is prepared, and 1 Prepare a DNA fragment downstream of the DNA fragment into which the new DNA fragment is to be inserted in the vGMEDA opin, then prepare a new DNA fragment to be inserted, and ligate the three.
- i 1 vGMEDA A DNA fragment upstream of the DNA portion into which a new DNA fragment is inserted in the peron can be prepared by cleaving a DNA fragment containing the full-length i1vGMEDA operon with an appropriate restriction enzyme.
- the DNA fragment of the i 1 vGMEDA operon upstream of the DNA portion into which the new DNA fragment is inserted may be amplified by the PCR method.
- the primer DNA used in the PCR method has already been reported by RP Lawther et al. (Nucleic Acids Res. 15, 2137 (1987))
- the nucleotide sequence has already been reported by G. Coppola et al. (GeneSI 21 (1991))
- Chemical synthesis may be performed based on the base sequence.
- a DNA fragment in the i 1 vGMEDA operon that is located in an upstream region of the DNA portion into which a new DNA fragment is inserted may be chemically synthesized.
- New DNA fragments to be inserted can be prepared by chemical synthesis.
- the DNA fragment of the i1 vGMEDA operon upstream of the DNA portion into which the new DNA fragment is inserted, or the DNA fragment of the i1 vGMEDA operon downstream of the DNA portion into which the new DNA fragment is inserted may be ligated.
- a new DNA fragment inserted into the primer DNA may be ligated.
- one of the new DNA fragments to be inserted into the 3 'DNA primer used to amplify the DNA fragment upstream of the DNA portion into which the new DNA fragment of the i1 vGMEDA operon is inserted Are connected.
- the new DNA fragment to be inserted into the 5 'DNA primer used to extend the DNA fragment downstream of the DNA portion of the i1 vGMEDA operon into which the new DNA fragment is inserted is used. Connect the complementary strands. The two DNA fragments to be amplified using these primers are ligated.
- the 1J_JLA gene is removed or the expressed snyonin deaminase is removed so that the threonine deaminase activity is not expressed.
- Transforms inside the J_LA gene to be deactivated The i1VA gene is modified so as to cause a mutation, insertion, deletion or the like.
- a modification method for example, there is a method in which a restriction enzyme site existing in the _LJ_ ⁇ gene is cleaved and a DNA fragment downstream of the cleavage point is removed. i The DNA fragment may be cut out by cutting the IVA gene at two restriction sites and religating it.
- the expressed threonine deminase can be inactivated.
- the restriction enzyme cleavage site is a sticky end
- the expressed threonine deaminase can also be inactivated by blunting the sticky end and then linking the ends.
- threonine deaminase can be inactivated by site-directed mutagenesis or the like.
- ⁇ tennis Huet Chillon is released, and threonine deaminase activity was expressed that L, and deleted i 1 v GMED operon i 1 V GMEDA operon or i 1 v A, n that desensitized i 1 vGMEDA * operon
- ⁇ ⁇ encodes the deletion of the ⁇ IV transgene or the inactive threonine deaminase or a part thereof!
- the DNA fragment containing the released i 1 V GMED A ′ operon obtained as described above is introduced as a recombinant DNA into a suitable host microorganism and expressed, thereby encoding the ⁇ 1 vGMEDA ′ operon. It is possible to obtain microorganisms with high expression of enzymes of the phosphorus biosynthesis system.
- the host microorganisms belonging to the genus Escherichia are preferable, and examples include Escherichia coli.
- the release type i 1 V GMED A 'operon may be extracted from the recombinant DNA and inserted into another vector DNA.
- a vector DNA that can be used in the present invention, a plasmid vector DNA is preferable, and examples thereof include pUC19, pUC18 pBR322, pHSC299 pHSG298, pHSG399, pHSG398, RSF1010, pMW119, pMW118, pMW219 pMW218 and the like.
- a phage DNA vector can be used. 1
- desensitized ⁇ expression 1 vGMEDA 'operon in order to efficiently implement, desensitized i 1 V GMED A * 1 ac upstream of operons, trp, other acting in the microorganism, such as P L A promoter may be linked, and a promoter specific to the i1V GMEDA * operon may be used as it is or after amplification.
- a DNA fragment containing the release type i1 vGMEDA * operon inserted into an autonomously replicable vector DNA is introduced into a host, and the host is retained as extrachromosomal DNA such as plasmid.
- a DNA fragment containing the released i1vGMEDA 'operon can be obtained by transduction, transposon (Berg, DE and Berg, CM, Bio / Technol., 1,417 (1983)), Mu phage (Japanese Unexamined Patent Publication No. No. 109985) or homologous recombination (Experiments in Molecular Genetics,
- the number of release type i 1 vGMEDA 'operons to be introduced into the host may be one or more.
- the DNA fragment containing the released i I vGMEDA * open is introduced into a microorganism belonging to the genus Escherichia deficient in lipoic acid-requiring or / and H + -ATPase deficient, thereby obtaining L —Palin-producing bacteria are obtained.
- L-valine-producing bacteria can be obtained by introducing lipoic acid auxotrophy or Z and H + -ATPase deficiency into microorganisms that have been transfected with a DNA fragment containing the released i 1 vGME operon. .
- L-lipid isine-producing ability is lipoic acid-requiring mutant, H +
- H + By adding or enhancing the strain or a mutant having both the lipoic acid-requiring 1 H + -ATPase deficient mutation, it is expected that the ability to produce L-lipe isine can be imparted or enhanced.
- the addition or enhancement of the ability to produce L-lipe isine may be achieved, for example, in addition to the above-mentioned properties required for L-valine production, by adding the L-leucine biosynthesis gene whose control mechanism has been substantially released to microorganisms belonging to the genus Escherichia. It is done by introducing.
- a mutation may be introduced so that the control mechanism of the L-lipid isin biosynthetic gene held by a microorganism belonging to the genus Escherichia is substantially released.
- An example of such a gene is the 1euA gene in which inhibition by L-leucine has been substantially released.
- the microorganism of the present invention may have, in addition to the L-valine-producing ability or L-one-isine-producing ability described above, known properties effective for improving amino acid-producing ability, for example, various nutrient requirements, drug shochu properties, and drugs. It may also have a characteristic that a gene that improves amino acid biosynthesis is amplified by properties such as sensitivity and drug dependency or by genetic engineering techniques. ⁇ 2> Method for producing L-valine or L-leucine of the present invention
- the microorganism of the present invention is cultured in a liquid medium, L-parin or L-isine is produced and accumulated in the culture solution, and L-noline is produced from the culture solution. Or it can be done by collecting L bite ischine.
- the L-valine-producing bacterium of the present invention is used for the production of L-valine
- the L-single-isine-producing bacterium of the present invention is used for the production of L-leucine.
- the cultivation of L-valine-producing bacteria or L-leucine-producing bacteria and the collection and purification of L-valine or L-one-isine from the culture solution are performed by conventional amino acid production by fermentation using microbes. T, in the same manner as in the manufacturing method.
- the medium used for cultivation may be a synthetic medium or a natural medium as long as it contains a carbon source, a nitrogen source, and an inorganic substance, and if necessary, contains an appropriate amount of a nutrient required by the strain used for growth. Good.
- the carbon source include various carbohydrates such as glucose-sucrose and various organic acids.
- alcohols such as ethanol-glycerol can be used depending on the assimilation properties of the microorganism used.
- ammonia As a nitrogen source, Ammonia, various ammonium salts such as ammonium sulfate, amines and other nitrogen compounds, and natural nitrogen sources such as neptone, soybean hydrolyzate, and fermentation cell decomposed products can be used.
- the inorganic substance monopotassium phosphate, magnesium sulfate, sodium chloride, ferrous sulfate, manganese sulfate, calcium carbonate and the like are used.
- the cultivation is preferably carried out under aerobic conditions such as shaking cultivation and aeration / agitation culturing, and the cultivation temperature is 20 to 40, preferably 30 to 38.
- the pH of the medium is usually in the range of 5 to 9, preferably in the range of 6.5 to 7.2.
- the pH of the medium can be adjusted with ammonia, calcium carbonate, various acids, various bases, buffers and the like. Usually, after 1 to 3 days of culture, the desired L-palin or L-leucine accumulates in the culture solution.
- FIG. 1 is a diagram showing a procedure for constructing plasmid pHSGSK.
- FIG. 2 is a diagram showing the procedure for constructing plasmid pdGMl.
- FIG. 3 is a diagram showing a procedure for constructing the plasmid PMWGMA2.
- FIG. 4 is a diagram showing a procedure for constructing plasmid pMWD5.
- FIG. 5 is a diagram showing a procedure for constructing the plasmid pMWd AR6.
- BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
- Example 1 Creation of L-valine-producing Bacterium 1. Chromosomal DNA was extracted from the 162 strain Umezuki Escherichia coli MI of the release type i ⁇ vGMED operon-expressing plasmid DMWdAR6. The chromosome D NA was cut with the restriction enzyme Hind111. The Hind111-Hindill DNA fragment containing the i1 vGM gene has been found to be 4.8 kb long.
- Hinddlll-Hindil DNA fragment having a length of about 4.8 kb and a DNA fragment obtained by digesting plasmid vector pBR322 (purchased from Takara Shuzo Co., Ltd.) with Hindill were used. Connected.
- the obtained DNA ligation mixture was introduced into an Escherichia coli Ml 262 strain, which is an acetate hydroxy acid synthase deficient strain.
- a strain that was transformed and complemented with the acetohydroxyacid synthase-deficient trait was selected, and the plasmid carried by the strain was isolated.
- a 4.8 kb DNA fragment containing the i1vGM gene and a part of the 5 'end of the i1vE gene was found at the Hindlll site of PBR322. Had been inserted.
- the plasmid was named pBRGM7.
- a large fragment obtained by digesting fragment (A) with _ ⁇ _m_ ⁇ J and a DNA fragment obtained by digesting vector PUC 18 (Takara Shuzo) with _ ⁇ JQ_ ⁇ I are ligated to form plasmid pUC A It was created.
- the large fragment obtained by digesting fragment (B) with iL & JlI and the large fragment obtained by digesting PHSG399 (Takara Shuzo) with Hinc II and Kp ⁇ I were ligated. To make plasmid pHSGB.
- Plasmid pUCA] is digested with LBJII, the cut end is blunt-ended using the large fragment of DNA polymerase I (Klenow fragment), digested with PstI, and finally DN containing fragment (A). The A fragment was singulated.
- Plasmid pHS08 is digested with ⁇ 1 ⁇ «1111, the blunt end is digested with a large fragment of DNA polymerase I (Klenow fragment), digested with I, and finally contains fragment (B). The DNA fragment was isolated. Both DNA fragments were ligated to prepare plasmid pHSGSK.
- fragment (C) corresponds to a fragment obtained by digesting a 4.8 kb HindIII_Hindill fragment containing the i1 vGM gene with SmaI and KpnI, and contains promoter, SD sequence and ⁇ J_JL Includes the upstream region of the gene, but lacks about 0.2 kb of the sequence from the leader sequence to the attenuator region.
- the procedure for constructing pHSGSK is summarized in FIG.
- Plasmid pDRIA4 described in JP-A-2-458 is a shuttle vector pDR1120 that is autonomously replicable in Escherichia bacteria and autonomously replicable in Brevibacterium bacteria; prepared by ligating a BamHI-BamHI fragment containing a part of the 3 'end of the i1VA gene and the i1vD gene encoding threonine deaminase derived from E. coli K-12. You. The BamH I_ _ ⁇ jnHI fragment is described as 2.3 kb in Japanese Patent Application Laid-Open No. 2-458, but is now found to be 2.75 kb.
- Plasmid pDR IA 4 Is present outside the chromosomal DNA of Brevibacterium flavum AJ 12358 (FERM P-9765) or Brevibacterium flavum AJ 12359 (FERM P-9765). Plasmid pDRIA4 can be prepared from these strains by a conventional method. Although threonine deaminase encoded by the J_J_ ⁇ A gene of pDRIA4 has been released from feedback inhibition by L-isoleucine, release of this feedback inhibition is not essential in the present invention.
- plasmid pDR I A4 BamHI 2.
- the i1VA gene which encodes a threonine deaminase that has been substantially desensitized by L-isoleucine in a 75 kb DNA fragment. was prepared and ligated to a DNA fragment obtained by cleaving vector pMWl19 (manufactured by Futaba Gene) with Hindill and BamHI. The plasmid thus produced was named pMWA1.
- a DNA fragment obtained by cleaving plasmid pMWA1 with iijidlll was ligated to a DNA fragment containing the i1vGM gene obtained by cleaving plasmid pdGMl with Hindill.
- plasmid pMWGMA2 contains the i1 vGM gene with the attenuator removed, part of the 5 'end of the i1vE gene, and part of the 3' end of the i1 vD gene. are doing.
- Figure 3 summarizes the procedure for constructing pMWGM A2.
- a chromosomal DNA of Escherichia coli 1I162 strain was prepared and cut with Sa1I and ⁇ _1 to prepare a DNA fragment mixture.
- a vector pUC19 (Takara Shuzo) was cut with Sa1I and PstI to prepare a DNA fragment.
- the DNA fragment mixture and the DNA fragment obtained by cutting pUC19 were ligated to obtain a DNA mixture.
- the DNA mixture was transfected into the transaminases B-deficient strain AB2070 (J. Bacteriol. 109, 703, 1972, purchased from Escherichia coli Genetic Stock Center; CGSC2070), transformed, and transformed into branched-chain amino acids. The strain whose demand was restored was selected.
- Plasmid was prepared from the same strain, and the plasmid pUC19 was cleaved with Sa1I and PstI, The Sa1I-PstI DNA fragment containing the i1vE gene was ligated. This plasmid was named pUCE1.
- pUCEl has a part at the 3 ′ end of the i1vM gene, an i1vE gene, and a part at the 5 ′ end of the i1vD gene.
- PMWGMA2 was partially digested with HindII to prepare a DNA fragment mixture.
- pUCE1 is cut with iLiJldin, and a 1.7 kb Hindlll-Hindil DNA fragment containing a part of the i1vE gene and a part of the 5 'end of the i1vD gene is included.
- a DNA mixture obtained by ligating the two a dihydroxyacid dehydratase (iIvD gene product) -deficient AB 1280 strain was transformed, and among the transformed strains, the requirement for branched-chain amino acids was determined. Those that disappeared were selected.
- Plasmid was prepared from the same transformant, and pMWGMA2 was derived from pUCE1 and a DNA fragment obtained by cleaving pMWGMA2 only at the iLldIII site existing between attGM and i1v ⁇ .
- a 1.7 kb Hindlll-Hindill DNA fragment containing a part of the JJ_ ⁇ gene and a part of the ⁇ _! _ ⁇ Gene was ligated, and the i1v GME operon was regenerated.
- the resulting plasmid was named pMWD5.
- the procedure for constructing pMWD5 is summarized in FIG.
- the plasmid pMWD5 obtained as described above is a plasmid having the i1V GME DA operon in which pMWl19 is used as a vector and in which the region required for attentation has been removed.
- the plasmid PMWD5 thus obtained was completely digested with SnaBI and then partially digested with Accl11.
- the obtained DNA fragment was recirculated to obtain a plasmid pMWdAR6 in which only the i1VA gene was disrupted (FIG. 5).
- the plasmid pMWdAR6 obtained in this way is a plasmid lacking the area necessary for the attainment and having the i1vGMEDA operon in which the i1VA gene has been destroyed.
- E. coli AJ12631 is derived from E. coli 14851ip2 (ATCC25645) by using Plkc phage (IFO20008) to convert atpA401, a mutant gene that has a mutation in the subunit of F1 of the H + -ATPase derived from coli AN718 (CGS C6308). It is a strain obtained by transduction (see Japanese Patent Application Laid-Open No. 5-137568). Transduction strains having an H + -ATPase deficient mutation were selected using the bgl gene located near the atpA401 gene as a marker.
- the bgl gene encodes a phospho-9-glucosidase, and eoli having a wild-type bgl gene (bgl-) cannot assimilate salicin, but having a mutant bgl gene (bgl +) has salicin as the only carbon It becomes possible to grow as a source, and when promotimul blue (BTB) is added to the plate medium, the salicin-assimilating strain colonies are colored yellow by the organic acid produced by themselves. Therefore, if the mutant bgl gene (bgl + ) and the atpA401 gene are linked and transduced, H + -A TPase-deficient mutants can be efficiently selected.
- BTB promotimul blue
- a salicin-assimilating (bgl + ) strain was cloned from coU A 718, followed by infecting the AN718 (bgl + ) strain with Plkc, and transducing eoii W14851ip2 using the obtained lysate.
- the lipoic acid auxotrophy and H + -ATPase activity of the obtained transgenic strain were examined, and it was confirmed that both the lipoic acid auxotrophy and H + -ATPase deficient mutation were retained.
- E. W1485atpA401 is a strain obtained by similarly transducing ⁇ eU W1485 with atpA401.
- Example 2 Production of L-no, * Phosphorus The L-valine productivity of the L-valine-producing bacteria obtained in Example 1 was evaluated. Bact Each transformant is applied to a medium consisting of 1% tryptone, 0.5% yeast extract, 5% NaClO.5%, agar 1.5%, and ampicillin 100g / ml, and culture at 37'C for 18 to 24 hours.
- ACATAAGCCC TCCTTGAGTC ACCAHATGT GCATAAGATA TCGCTGCTGT AGCCCGCTAA 660
- ATC GCC GTG GGC GCA CGT TTT GAT GAC CGG GTG ACC GGC AAA CTG AAC 2040 lie ALa Val Gly Ala Arg Phe Asp Asp Arg Val Thr Gly Lys Leu Asn
- GAT CGT AAA CCT GCG GAT TGC GTC GTG ACC ACA GAT GTG GGG CAG CAC 2328 Asp Arg Lys Pro Ala Asp Cys Val Val Thr Thr Asp Val Gly Gin His
- ATC ACC TCC AGC GGT TTA GGT ACC ATG GGT TTT GGT TTA CCG GCG CCG 2424 lie Thr Ser Ser Gly Leu Gly Thr Met Gly Phe Gly Leu Pro Ala Ala
- Gly Ala Ala Met Ala Ala lie Gly Tyr Ala Arg Ala Thr Gly Lys Thr
- Lys lie Val Leu Leu Asp Asn Gin Arg Leu Gly Met Val Arg Gin Trp
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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DE69535674T DE69535674T2 (de) | 1994-08-30 | 1995-08-30 | Verfahren zur herstellung von l-valin und l-leucin |
US08/793,441 US5888783A (en) | 1994-08-30 | 1995-08-30 | Methods for producing L-valine and L-leucine |
EP95930006A EP0872547B1 (en) | 1994-08-30 | 1995-08-30 | Process for producing l-valine and l-leucine |
JP50832796A JP3709564B2 (ja) | 1994-08-30 | 1995-08-30 | L−バリン及びl−ロイシンの製造法 |
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JP20485694 | 1994-08-30 | ||
JP6/204856 | 1994-08-30 |
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US09/231,061 Division US6214591B1 (en) | 1994-08-30 | 1999-01-14 | Methods for producing L-valine and L-leucine |
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WO1996006926A1 true WO1996006926A1 (fr) | 1996-03-07 |
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PCT/JP1995/001719 WO1996006926A1 (fr) | 1994-08-30 | 1995-08-30 | Procede pour produire de la l-valine et de la l-leucine |
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EP (1) | EP0872547B1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP0872547A1 (en) | 1998-10-21 |
EP0872547B1 (en) | 2007-12-26 |
JP3709564B2 (ja) | 2005-10-26 |
DE69535674D1 (de) | 2008-02-07 |
US5888783A (en) | 1999-03-30 |
CN1162976A (zh) | 1997-10-22 |
CN1124340C (zh) | 2003-10-15 |
EP0872547A4 (en) | 2001-05-23 |
DE69535674T2 (de) | 2009-01-02 |
US6214591B1 (en) | 2001-04-10 |
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