WO2005103275A1 - 発酵法によるl-トリプトファンの製造法 - Google Patents
発酵法によるl-トリプトファンの製造法 Download PDFInfo
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1205—Phosphotransferases with an alcohol group as acceptor (2.7.1), e.g. protein kinases
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- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/88—Lyases (4.)
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- 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
- C12P13/22—Tryptophan; Tyrosine; Phenylalanine; 3,4-Dihydroxyphenylalanine
- C12P13/227—Tryptophan
Definitions
- the present invention relates to a method for producing L-tributophan by a fermentation method.
- L-triptophan is industrially useful as a feed additive, a pharmaceutical raw material for infusions and the like.
- L-amino acids are industrially produced by fermentation using microorganisms belonging to the genus Plebipacterium, Corynepacterium, Escherichia, and the like.
- a method using a recombinant Escherichia coli is described in JP-A-57-71397 or US Patent No. 4,371,614.
- a method using a mutant strain of subtilis (Bacillus subtilis) is described in JP-B-53-39517 or JP-B-62-34399, and a method using a recombinant Bacillus subtilis is disclosed in
- a method using a mutant strain of the genus Brevibacterium is described in JP-A-57-74096, which is described in JP-A-104790 or JP-B-62-34399.
- a method using a recombinant Brevibacterium is described in JP-A-62-51980.
- breeding of these L-tryptophan-producing bacteria is mainly due to the enhancement of enzymes that catalyze reactions in the common pathway of various amino acid biosynthesis and subsequent pathways unique to L-tributophane biosynthesis, or by L-tryptophan. It has been done by avoiding regulation (feedback inhibition). Specifically, the application of nutritional requirements to microorganisms, the provision of drug resistance, and the amplification of biosynthetic enzyme genes by recombinant DNA techniques have been performed. As such a biosynthetic enzyme gene, L-triptophan operon and the like are known (JP-A-57-71397, JP-A-62-244382, U.S. Pat. No. 4371614).
- bacteria of the genus Escherichia belonging to the genus Escherichia bacterium which has the ability to produce L-glutamic acid and has a constitutive expression of malate synthase, isocitrate lyase, isocitrate dehydrogenase kinase Z phosphatase operant (hereinafter also referred to as “ace operon”).
- ace operon isocitrate dehydrogenase kinase Z phosphatase operant
- An object of the present invention is to provide a method for efficiently producing L-tributofan by improving the ability of microorganisms to produce L-tributanoic acid.
- the present inventors have conducted intensive studies on the improvement of L_tributophane production ability of a bacterium belonging to the genus Escherichia, and as a result, an L-tryptophan analog named JAT is produced as a by-product with production of L-tributophane.
- JAT an L-tryptophan analog
- the present invention is as follows.
- L-tryptophan-producing ability, and malate synthase 'isocitrate lyase' isocitrate dehydrogenase ⁇ ⁇ kinase / phosphatase operon is constitutively expressed or the operon
- a method for producing L-tryptophan comprising culturing bacteria with enhanced expression in a medium, producing and accumulating L-tryptophan amino acids in the medium, and collecting the L-tryptophan amino acids.
- the bacterium is a bacterium that constitutively expresses the operon when the expression level of the iclR gene decreases or disappears.
- L-tryptophan-producing bacteria are cultured in a medium to produce and accumulate L-tryptophan in the same medium, and L-tryptophan is collected.
- Bacteria that express constitutively or have enhanced expression of rate synthase, isocitrate lysate, or isocitrate dehydrogenase kinase / phosphatase operon, or have enhanced expression of tribubutane synthase A method for reducing the by-product of an L-tributophan analog by using the method.
- FIG. 1 is a diagram showing the structure of a plasmid vector pTSl having a temperature-sensitive replication origin.
- FIG. 2 is a diagram showing an ODS column chromatogram of a fermentation product. The numerical values indicate the elution time (minutes). BEST MODE FOR CARRYING OUT THE INVENTION
- the bacterium used in the method for producing L-tryptophan of the present invention has L-tryptophan-producing ability and constitutively expresses the malate synthase 'isocitrate lyase ⁇ isocitre-1-dehydrogenase kinase ⁇ / phosphatase operon. Or a bacterium with enhanced expression of the same.
- Examples of the bacterium used in the present invention include a bacterium belonging to the genus Escherichia, the genus Enterobacter, the genus Tarebushiella, the genus Serratia, the genus Erwinia or Pantoea, the genus Pseudomonas, the genus Earthpactor, and the genus Aeropactor.
- bacteria belonging to the genus Escherichia are preferred.
- Specific examples of the bacterium belonging to the genus Escherichia include Escherichia coli.
- L-tributophan-producing ability refers to the ability to accumulate a significant amount of L-tributophan in a medium when a bacterium is cultured in the medium, or the L-tributophan content in a bacterial cell as a wild-type strain. Or, the ability to increase as compared to a non-transformed strain.
- the bacterium having L-tryptophan-producing ability may be a mutant strain or a genetically modified strain. Mutants that increase the intracellular activity of an enzyme involved in L-tryptophan biosynthesis, specifically, a mutation that increases the expression level of an enzyme, or a mutation that releases feedback inhibition And a mutant having the following formula: Mutants can be obtained, for example, by irradiation with ultraviolet light or a mutagen that is commonly used in mutagenesis treatments such as N-methyl-N'-nitro_N-nitrosogazine (NTG) or nitrite to produce a wild-type strain of a genus Escherichia. Alternatively, it can be obtained by treating a derivative thereof.
- NTG N-methyl-N'-nitro_N-nitrosogazine
- transgenic strain a strain in which the copy number of a gene encoding an enzyme involved in biosynthesis of L-tributophane is increased, or a strain in which an expression control sequence is modified so that the expression level of the gene is increased Or a strain into which a gene encoding an enzyme whose feedback inhibition has been released has been introduced.
- Preferred bacteria having L-tryptophan-producing ability are bacteria in which one or more of the activities of anthranilate synthase activity, phosphodalicerate dehydrogenase activity or tryptophan synthase activity are enhanced.
- anthranilate synthase and phosphoglycerate dehydrogenase are subject to feedback inhibition by L-tryptophan and L-serine, respectively, the enzyme activity can be enhanced by retaining the desensitized mutant enzyme.
- the anthranilate synthase gene (trpE) and / or the phosphoglycerate dehydrogenase gene (serA) are subject to feedback inhibition.
- such a bacterium includes a plasmid having a mutant serA encoding a desensitized phosphodarycelate dehydrogenase in Escherichia coli SV164, which retains a desensitized anthranilate synthase.
- a transformed strain obtained by introducing PGH5 (see W094 / 08031) may be mentioned.
- a bacterium into which recombinant DNA containing the tryptophan operon has been introduced is a suitable L-tributophan-producing bacterium.
- Escherichia coli having a tributophan operon containing a gene encoding a desensitized anthranilate synthase JP-A-57-71397, JP-A-62-244382). No. 4,371,614.
- the expression of a gene encoding tryptophan synthase (trpBA) can also be enhanced or imparted with L-tributophan-producing ability.
- Tryptophan synthase consists of ⁇ -subunit mosquito and is encoded by trpA (GenBank Accession No. V00364) and trpB (GenBank Accession No. V00365), respectively.
- the tryptophan synthase activity can be measured by the method described in Science 1958; 128 (3328): p843-844.
- the nucleotide sequence of trpA is shown in SEQ ID NO: 15, and the nucleotide sequence of trpB is shown in SEQ ID NO: 17.
- a target gene can be obtained by synthesizing a primer based on a known sequence and performing PCR with chromosomal DNA of a bacterium belonging to the genus Escherichia such as Escherichia coli K-12 strain as a type III DNA. Noh.
- a recombinant DNA can be prepared by ligating a gene of interest with a vector that functions in bacteria, and the bacterium can be transformed with the recombinant DNA. Transformation can be performed by the method of DA Morrison (Methods in Enzymology, 68, 326, 1979), or by treating recipient cells with calcium chloride to increase DNA permeability (Mandel, M. and Higa, A , J. Mol., Biol., 53, 159 (1970)).
- Examples of the vector include pUC19, pUC18, pUC118, pUC119, pBR322, pHSG299, pHSG298, pHSG399, pHSG398, RSF1010, pMW119, pMW118, pMW219, pMW218, pSTV28, PSTV29 and the like, and other phage vectors can also be used. .
- Increasing the copy number of a gene can also be achieved by causing multiple copies of the gene of interest on the bacterial chromosomal DNA.
- homologous recombination is performed using a sequence present in multiple copies on the chromosome DNA as a target.
- a sequence present in multiple copies on the chromosome DNA repetitive DNA and an inpartite repeat present at the end of a transposable element can be used.
- the activity of the target enzyme can also be increased by substituting a strong expression regulatory sequence such as the promoter of the gene encoding the target enzyme (see JP-A-1-215280).
- a strong expression regulatory sequence such as the promoter of the gene encoding the target enzyme (see JP-A-1-215280).
- lac promoter, trp promoter, trc promoter, tac promoter, PR promoter of lambda phage, PL promoter, tet promoter, amyE promoter and the like are known as strong promoters.
- L-tryptophan-producing bacteria strains containing L-feralanine and L-orchid synthon-requiring traits Escherichia coli 'AGX17 (pGX44) [NRRL B-12263], and plasmids containing the tryptophan operon Hold PGX50 AGX6 (pGX50) aroP [NRRL B-12264] (all refer to US Pat. No. 4,371,614).
- the bacterium used in the present invention is a bacterium capable of producing L-tributophan as described above, and further comprises a malate synthase / isocitrate lyase 'isocitreto-dehydrogenase kinase Z phosphatase operon (ace operon).
- ace operon a malate synthase / isocitrate lyase 'isocitreto-dehydrogenase kinase Z phosphatase operon.
- a bacterium with enhanced expression or expression of the operon is a bacterium capable of producing L-tributophan as described above, and further comprises a malate synthase / isocitrate lyase 'isocitreto-dehydrogenase kinase Z phosphatase operon.
- Constitutive expression of malate synthase, isocitrate lyase, isocitrate dehydrogenase kinase Z phosphatase operon indicates that the promoter of the ace operon is suppressed by the repressor protein iclR Means that they are not affected, and that suppression has been lifted.
- the constitutive expression of the ace operon and the enhanced expression of the operon indicate that the ace operon encodes proteins such as malate synthase (aceB) and isocitrate lyase (aceA). It can be confirmed by the fact that the enzyme activity of isocitrate dehydrogenase kinase Z phosphatase (aceK) is increased as compared with the non-modified strain or the wild-type strain.
- aceB malate synthase
- aceA isocitrate lyase
- the repressor (iclR) binding site on the ace operon may be modified so that iclR cannot bind.
- suppression can be released by replacing the promoter of the operon with a strong promoter that is not suppressed by iclR (such as the lac promoter).
- expression of the ace operon can be constitutive.
- the expression control sequence of the gene encoding iclR is modified so that it does not express the gene, or the coding region is modified so that the function of the repressor is lost, so that the ace Can be suppressed from being suppressed.
- the iclR gene can be obtained from Escherichia coli (EMBL / GenBank / DDBJ accession M31761, J. Bacteriol. 18, 3656-3656 (1990)). Also, the iclR-like gene is Streptomyces sericolor (EMBL / GenBank / DDBJ accession AL117387, Mol. Microbiol. 21 (1), 77-96 (1996)), Acinetobacter Sp. ). SEQ ID NO: 5 shows the sequence of the iclR gene of Escherichia coli.
- the bacteria are irradiated with ultraviolet light or a normal mutation such as N-methyl-N'-nitro-N-et-mouth soguanidine (NTG) or nitrite.
- NTG N-methyl-N'-nitro-N-et-mouth soguanidine
- a method of treating with the mutagen used in the treatment and selecting a mutant strain in which the expression of iclR or the function of iclR is reduced or eliminated is used.
- bacteria were transformed with DNA containing the iclR gene (deleted iclR) that was deleted so that the internal sequence of the iclR gene was deleted and did not produce a normally functioning repressor.
- DNA containing the iclR gene deleted iclR
- the iclR on the chromosome can be destroyed.
- Such gene disruption by gene replacement using homologous recombination has already been established, and there are a method using linear DNA and a method using a plasmid containing a temperature-sensitive replication origin.
- a temperature-sensitive replication origin, a deletion type iclR and a marker gene showing resistance to drugs such as ampicillin are introduced to prepare a recombinant DNA, and a coryneform bacterium is transformed with the recombinant DNA to obtain a temperature-sensitive replication origin.
- a coryneform bacterium is transformed with the recombinant DNA to obtain a temperature-sensitive replication origin.
- the strain in which the recombinant DNA has been integrated into the chromosome is originally present on the chromosome
- the two fusion genes of the chromosomal iclR and the deleted iclR sandwich the other part of the recombinant DNA (vector part, temperature-sensitive replication origin and drug resistance). It is inserted into the chromosome in a state. Therefore, in this state, the normal iclR is dominant, and the transformant expresses a normal repressor.
- one copy of the iclR is recombined with the vector portion (including the temperature-sensitive replication origin and one drug resistance marker) by recombination of the two iclRs.
- the vector portion including the temperature-sensitive replication origin and one drug resistance marker
- the excised DNA is maintained in the form of a plasmid when cultured at a temperature at which the temperature-sensitive replication origin functions.
- iclR on the plasmid is eliminated from the cell together with the plasmid. Then, by selecting a strain in which the deletion type iclR remains on the chromosome by PCR, Southern hybridization, or the like, a strain in which the iclR has been disrupted can be obtained.
- the bacterium of the present invention may be one in which the expression of the ace operon is enhanced.
- To enhance the expression of the ace operon for example, ligating the DNA containing the ace operon to a strong promoter such as a lac promoter and introducing it into bacteria by plasmid homologous recombination, phage DNA or transposon By allowing the DNA to exist in multiple copies on a chromosome.
- Examples of the DNA containing the ace operator include a DNA containing the nucleotide sequence registered in GenBank Accession No. X12431 (AceBA) and M18974 (AceK).
- the gene sequence of AceB is shown in SEQ ID NO: 9
- the gene sequence of AceA is shown in SEQ ID NO: 7
- the gene sequence of AceK is shown in SEQ ID NO: 11.
- L-tributophan By culturing the bacterium of the present invention obtained as described above in a medium, producing and accumulating L-tributophan in the medium, and collecting one tributophan from the medium, L-tributophan can be produced.
- the cultivation of the bacterium of the present invention is carried out by a conventional method using a usual medium containing a carbon source, a nitrogen source, inorganic salts, and if necessary, organic trace nutrients such as amino acids and vitamins.
- I can.
- Either a synthetic medium or a natural medium can be used.
- the carbon source and the nitrogen source used in the medium may be of any type as long as the strain to be cultured is available.
- sugars such as glucose, glycerol, fructose, sucrose, maltose, mannose, galactose, starch hydrolyzate, molasses, etc. are used.
- Others are organic acids such as acetic acid and citric acid, and alcohols such as ethanol. Can be used alone or in combination with other carbon sources.
- fructose is used as the main carbon source, the yield of L-tryptophan relative to sugar and the production rate are improved.
- inorganic ammonium salts such as ammonium sulfate, ammonium chloride and ammonium phosphate
- organic nitrogen such as soybean hydrolysate, ammonia gas, ammonia water and the like
- potassium phosphate magnesium sulfate, iron ions, manganese ions, etc. are added in small amounts.
- organic trace nutrients it is desirable to include required substances such as vitamin B1 or yeast extract in an appropriate amount as necessary.
- the culture may be performed under conditions according to the strain used.Specifically, the culture is preferably performed under aerobic conditions for 16 to 72 hours, and the culture temperature is 30 ° C to 45 ° C. During the culture, the pH is controlled at 5-7. For pH adjustment, an inorganic or organic acidic or alkaline substance, ammonia gas or the like can be used.
- Collection of L-tryptophan from the fermentation broth can be carried out by appropriately combining known methods such as an ion exchange resin method, a precipitation method and the like.
- the production of L-tryptophan analogs by-produced with the production of L-tributophan is significantly reduced. That is, the ability to express the ace operon constitutively, or enhancing the expression of the operon, or enhancing the activity of tryptophan synthase, reduces the production of by-products. It is presumed that the improvement in the yield of L-tributophane is based on the results.
- the L-tributophan analog was analyzed by LC / MS and LC / NMR to have the following properties, and was named JAT.
- the present invention provides a method for producing L-tryptophan, comprising culturing a bacterium having an ability to produce L-tryptophan in a medium, producing and accumulating L-tryptophan in the medium, and collecting the L-tryptophan.
- Plasmid P CE1134 containing MudII1734 Japanese Unexamined Patent Publication No. 2-109985 was digested with BamHI to remove the DNA fragment containing the lac operon, and after blunt-ending, Smal linker was inserted.
- the plasmid obtained by recleaving this plasmid with Smal and self-closing was named pMull34.
- trp operation gene was excised from plasmid pGXIOO.
- pGXIOO is the P BR313, E. coli MT 2 strain (U.S. Patent No. 4, 371, 614 Pat) having desensitized type trpE gene is obtained by ⁇ the DNA fragment derived from, XhoI, smal cut As a result, a trp operon-containing DNA fragment of about 7.6 kb can be cut out.
- a DNA fragment containing the trp operon was excised from pGXIOO by XhoI and Smal digestion, blunt-ended, and inserted into the Smal site of pCE1134 described above.
- a similar trp-operin-containing DNA fragment can also be cloned from E. coli MT2 strain chromosomal DNA by direct PCR using the primers of SEQ ID NOS: 1 and 2 described in the sequence listing.
- a plasmid pMudtrp G, lac carrying Mud (named Mudtrp G , lac) into which the trp open gene from the ⁇ 2 strain was inserted was constructed.
- L-palin resistance was introduced into the L1 strain from an L-sleonine-producing strain B-3996 (Tokuhyohei Hei 55-101682) derived strain.
- M9 minimal medium (4g / L glucose, 12. 8g / L Na 2 HP0 4 '7 0, 3g / L KH 2 P0 4, 0.
- ME8581 strain (HfrH (valS-uxuAB): lacZ98:: Tnl0 relAl thi-1, National Institute of Genetics LacZ98 :: TnlO was transduced with P1 into LlValR according to a standard method using tetracycline resistance derived from TnlO as an index. The obtained strain was deficient in ratatose utilization as expected. Then, Ratatosu utilization ability is missing, because TnlO itself to obtain a strain that has been removed, tetra SITA phosphorus sensitive strain 14- l-lac- tet s from transduced strain was obtained by replica process .
- the 14-1-lac-tet s strain remained defective in assimilating ratatose.
- TnlO the status of TnlO of the same strain was confirmed in a Southern hybridization experiment, no band that hybridized to the tet gene was detected, but a band that hybridized to the IS10 region of TnlO was detected. It is believed that IS10 remained above.
- PCR was performed using Pyrobest DNA Polymerase (Takara Shuzo) according to the attached instructions to amplify the iclR fragment.
- the W3110 genome extracted using the RNA / DNA maxi Kit (Qiagen) was designated as type III, and oligonucleotides of SEQ ID NO: 3 and SEQ ID NO: 4 shown in the sequence listing were used as primers.
- the amplified DNA fragment after PCR was purified using Wizard PCR Preps (Pupa Mega). The purified DNA fragment was digested with restriction enzyme 0 RI and ⁇ (Takara Shuzo), and then purified by phenol-cloth form treatment and ethanol precipitation.
- This digested fragment was ligated with pUC18 (Takara Shuzo) cleaved and purified by the same enzyme using DNA ligation Kit Ver. 2 (Takara Shuzo).
- Use this binding reaction solution with JM109 Bets cells (Takara Shuzo) were transformed, plated on ampicillin (Amp) (Meiji Seika) and 50 ⁇ ⁇ ⁇ containing LB agar plates (LB + Amp plate), and colonies were selected at 37 ° C. The colonies were cultured in test tubes in LB medium containing 50 ⁇ of Amp at 37 ° C, and plasmid extraction was performed using an automatic plasmid extractor PI-50 (Kurabo Industries).
- the resulting plasmid pUCiclR was digested with restriction enzyme o065I (Takara Shuzo), and then blunt-ended and ligated using BKL kit (Takara Shuzo). JM109 was transformed with the binding reaction solution, and colonies were selected and plasmids were extracted as described above.
- the resulting flop Rasumi de the CO RI, purified cleaved with V3 ⁇ 477dIII, temperature-sensitive plasmid pTSl purified was cleaved with the same enzymes (pMA 031 (J. Bacteriol 162 ( 3), 1196 -. 1202) and pBR322 (Takara (Sake brewing).
- JM109 was transformed with the binding reaction solution, and colonies were selected on an LB + Amp plate at 30 ° C. The colonies were cultured in test tubes at 30 ° C in LB medium containing 50 g / mL Amp, and plasmids were extracted as described above. Plasmid from which the desired length fragment was obtained by digestion with coRI and mojjdlll was designated as plasmid pTSAiclR for iclR rupture.
- No. 202 was transformed with pTSAiclR, and colonies were selected on an LB + Amp plate at 30 ° C. After subjected to liquid culture overnight 10-3 dilutions to plated on LB + Amp plates at 30 ° C, were selected colonies in 42 ° C. After spread on LB + Am P plates at 30 ° C, the cells 1/8 plate fraction were suspended in LB medium 2 mL, and cultured with shaking 4- 5 hours at 42 ° C. 10-5 diluted bacterial cells by hundreds of colonies among the colonies obtained were plated on LB plates to confirm inoculated grown on LB plate and LB + Amp Plate was confirmed Amp sensitivity-resistant.
- PCR amplification and purification were carried out in the same manner as described above using sequences 13 and 14 described in the sequence listing as primers.
- ⁇ After cleavage and purification with ⁇ and ⁇ , plus digested and purified with the same enzyme
- the plasmid was ligated with midpMW118 (Nippon Gene), and JM109 was transformed with the ligated solution. Plasmids were extracted from the transformants, ⁇ 1 ⁇ , fragment of interest length was obtained, et al is intended to trpBA plasmid for amplifying (p ⁇ 118tr P BA) in cutting.
- the No. 202 was transformed with plasmid P MW118 ⁇ Pi PMW118trpBA, respectively obtained transformant No. 202 / pMW, the No. 202 / pMWtrpBA.
- Example 4 L-Tributophan-producing culture of iclR broken strain and trpBA amplified strain
- Soy protein hydrolysis (as total nitrogen) 0.4 g / L
- This medium was cultured in a 1 L small fermentor at 800 rpm at 30 ° C. for 11 to 15 hours. In addition, the fermentation was transferred to the main culture. The main culture was performed using a 1 L small fermenter. Culture medium The following were used.
- Soy protein hydrolysis (total nitrogen content) 0.75 g / L
- NH 4 C1 3.13 g / L 30 ml of seed culture was transferred to a small fermentor, and the starting volume was about 300 ml.
- the medium was first stirred at 800 rpm, and compressed air sterilized by a sterilizing filter was passed through lvvm.
- the temperature was maintained at 31 ° C, and the pH was maintained at 6.7 with ammonia gas.
- the glucose concentration in the small fermenter was adjusted to 5-20 g / L by pumping a glucose solution 700 g / L (W / V) (sterilized with autoclaving).
- Table 1 shows the fermentation results of L-tributophan (Trp) in the above culture.
- the fermentation yield and fermentation productivity (production per unit time) of L-tryptophan are shown as relative values when the value in No. 202 is set to 1.
- the amount of JAT by-product was estimated from the Trp area of HPLC.
- No. 202 and No. 202 / p ⁇ show the by-product of JAT, while No. 202AiclR and o. 202 / pMWtrpBA show almost no by-product, and the fermentation yield and productivity are low. Improved.
- Table 1 Fermentation results of 202, 202AiclR, No. 202 / pMW, No. 202pMWtrpBA strains
- Trp and JAT The analysis of Trp and JAT was performed as follows. That is, 20 samples were injected into L-column 0DS-5 ⁇ , ⁇ 4.6 ⁇ 250 ram, eluted under the following conditions for 65 minutes, and the absorption at 210 nm was detected.
- L-tributane can be efficiently produced.
- the production of by-products accompanying the production of L-tryptophan can be reduced.
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