WO2019164346A1 - L-트립토판을 생산하는 재조합 코리네형 미생물 및 이를 이용한 l-트립토판을 생산하는 방법 - Google Patents
L-트립토판을 생산하는 재조합 코리네형 미생물 및 이를 이용한 l-트립토판을 생산하는 방법 Download PDFInfo
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- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/77—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Corynebacterium; for Brevibacterium
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- C12P13/00—Preparation of nitrogen-containing organic compounds
- C12P13/04—Alpha- or beta- amino acids
- C12P13/22—Tryptophan; Tyrosine; Phenylalanine; 3,4-Dihydroxyphenylalanine
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- C12Y401/03—Oxo-acid-lyases (4.1.3)
- C12Y401/03027—Anthranilate synthase (4.1.3.27)
Definitions
- the present application relates to a genus of Corynebacterium producing recombinant L-tryptophan using genetic engineering techniques, and a method for producing L-tryptophan using the microorganism.
- L-Tryptophan is one of the essential amino acids, and has been widely used as a raw material for pharmaceuticals such as feed additives or sap and health food materials.
- microbial direct fermentation is mainly used for L-tryptophan production.
- the microorganisms used to produce L-tryptophan have been used mainly for the selection of analog-resistant strains through chemical or physical mutations.However, due to the rapid development of genetic recombination technology and molecular-level regulatory mechanisms in the 1990s, genetic engineering techniques were used. Recombinant strains are mainly used.
- L-tryptophan production using Escherichia coli has been conducted in various ways, including sugar influx, pentose phosphate pathway, serine biosynthesis, aromatic / tryptophan biosynthesis, and is now leading to industrial production.
- Microorganisms of the genus Corynebacterium, a commonly recognized as safe (GRAS) strain have the same advantages as Endotoxin-free and are applied to the production of glutamic acid, lysine, and valine. Inadequately applied to industrial production.
- One object of the present application is to provide a Corynebacterium microorganism that produces L-tryptophan, genetically recombined to overproduce L-tryptophan.
- Another object of the present application the step of culturing the microorganism in the medium; And it provides a method for producing L- tryptophan, comprising the step of recovering L-tryptophan from the cultured microorganism or medium.
- the L-tryptophan producing microorganism provided in the present application can enhance the expression of the genes encoding the feedback-released tryptophan operon and transketorase to improve L-tryptophan production in Corynebacterium spp. have.
- the combination of the expression of E. coli-derived tryptophan operon in the Corynebacterium genus microorganisms can significantly improve the production of L-tryptophan.
- it can be useful industrially, it is possible to provide a Corynebacterium genus microorganisms to enhance the fermentation stability to effectively produce L- tryptophan.
- One aspect of the present application for achieving the above object is a gene encoding an ansranilic acid synthase whose N-terminus is composed of the amino acid sequence of SEQ ID 32 and the feedback inhibition is released, and tryptophan operon and transke comprising the same
- ansranilic acid synthase whose N-terminus is composed of the amino acid sequence of SEQ ID 32 and the feedback inhibition is released, and tryptophan operon and transke comprising the same
- Another embodiment of the present application is modified to express the E. coli-derived tryptophan operon containing a gene encoding a feedback released anthranilic acid synthase in addition to the microorganism consisting of the amino acid sequence of SEQ ID NO: 33 N-terminal To provide a microorganism of the genus Corynebacterium that produces L-tryptophan.
- L-tryptophan is one of ⁇ -amino acids and refers to an aromatic amino acid that is an essential amino acid that is not synthesized in the body and has a chemical formula of C 11 H 12 N 2 O 2 .
- tryptophan operon refers to a group of genes encoding enzymes involved in synthesizing tryptophan from chorismic acid (chorismate).
- the tryptophan operon may be tryptophan operon derived from Corynebacterium spp., Or tryptophan operon derived from Escherichia spp.
- the tryptophan operon derived from the microorganism of the genus Corynebacterium may be the nucleotide sequence of SEQ ID NO: 34, but is not limited thereto.
- the tryptophan operon derived from the genus Escherichia may be the nucleotide sequence of SEQ ID NO: 43, but is not limited thereto.
- the gene group of tryptophan operon is one or more genes selected from the group consisting of trpE, trpG, trpD, trpC, trpB, and trpA genes in Corynebacterium spp., TrpE, trpD, trpC, in Escherichia spp.
- One or more genes selected from the group consisting of trpB and trpA genes are arranged under the promoter and effector to form the operon.
- the trpE, trpG, trpD, trpC, trpB, trpA genes of the genus Corynebacterium are amino acids of SEQ ID NO: 35, SEQ ID NO: 36, SEQ ID NO: 37, SEQ ID NO: 38, SEQ ID NO: 39, and SEQ ID NO: 40, respectively. It may be expressing the polypeptide of the sequence, but is not limited thereto.
- the trpE, trpD, trpC, trpB, and trpA genes of the Escherichia microorganism express polypeptides of the amino acid sequences of SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, and SEQ ID NO: 48, respectively. It may be, but is not limited thereto.
- the Corynebacterium microorganism may be Corynebacterium glutamicum
- Escherichia microorganism may be Escherichia coli.
- the tryptophan operon may have a known nucleotide sequence, and those skilled in the art can easily obtain the nucleotide sequence of tryptophan operon through a database such as NCBI or Kegg.
- Ordinary tryptophan operon is actively transcribed to produce sufficient amount of tryptophan as required by the cell, but in the presence of sufficient intracellular tryptophan, a repressor binds to tryptophan, which inactivates the tryptophan operon, thereby inhibiting transcription. .
- try to suppress the inhibitor of tryptophan operon and genetic manipulation is required so as not to receive feedback suppression by tryptophan.
- Proteins encoded by the tryptophan operon include anthranilate synthase, anthranilate phosphoribosyltransferase, phosphoribosylanthranilate isomerase, and indole-3-glycerol phosphate Synthetic enzymes (indole-3-glycerol phosphate synthase) and tryptophan synthase are known. However, it is not limited thereto. Specifically, first, anthranilic acid synthase acts on the chorismic acid to synthesize anthranilic acid.
- Ansranilic acid phosphoribosyl transferase then acts to synthesize phosphoribosyl anthranilic acid (N-(5'-phosphoribosyl) -anthranilate). Subsequently, phosphoribosyl anthranilic acid isomerase and indole-3-glycerol phosphatase act to synthesize indole-3-glycerol phosphate, and tryptophan synthase acts on L-tryptophan Complete the synthesis (Bonggaerts et al ., Metab Eng , 3, 289-300, 2001, Iris Brune et al ., J. Bacteriol., 189 (7): 2720-33, 2007).
- anthranilate synthase refers to an enzyme that synthesizes anthranilic acid from corrismic acid.
- the anthranilic acid synthase of the present application may be an anthranilic acid synthase derived from Corynebacterium spp., Or an ansranilic acid synthase derived from Escherichia spp.
- coryneglutacum the proteins produced by the trpE and trpG genes in tryptophan operon are polymerized, and the proteins produced by the trpE and trpD genes in E. coli form polymers to form anthranilic acid synthase.
- Ansranilic acid synthase of the present application unlike wild-type or natural-type protein having its activity, has the feature that the inhibition of feedback by the end product tryptophan, derivatives or analogs thereof is released or desensitized.
- the term "feedback inhibition” means that an end product of an enzyme system inhibits or inhibits a reaction at an early stage of the enzyme system. Therefore, in the case of releasing or desensitizing feedback inhibition of anthranilic acid synthase, it is possible to increase the productivity of tryptophan in comparison with the other cases.
- the anthranilic acid synthase in which the feedback inhibition is released is included in the present application as long as the feedback inhibition by tryptophan is released or desensitized.
- the anthranilic acid synthase from which the feedback inhibition is released may be N-terminal of the amino acid sequence of SEQ ID NO: 32, or N-terminal of the amino acid sequence of SEQ ID NO: 33.
- the amino acid sequence of SEQ ID NO: 32 is a sequence in which serine at position 38 is substituted with arginine
- the amino acid sequence of SEQ ID NO: 33 is a sequence in which proline at position 21 is substituted with serine.
- the polypeptide consisting of the amino acid sequence of SEQ ID NO: 32 or the amino acid sequence of SEQ ID NO: 33 is a polypeptide having the amino acid sequence of SEQ ID NO: 32 or SEQ ID NO: 33, a polypeptide consisting of the amino acid of SEQ ID NO: 32 or 33, or SEQ ID NO: 32 or 33 It can be used interchangeably with a polypeptide comprising an amino acid sequence of.
- the anthranilic acid synthase may have a known amino acid sequence derived from Corynebacterium microorganisms or an amino acid sequence derived from Escherichia genus microorganisms, and those skilled in the art will appreciate that anslanylic acid synthase may be obtained through a database such as NCBI or Kegg. Amino acid sequences can be easily obtained. However, in the case of microorganisms of the genus Corynebacterium to eliminate feedback inhibition, as long as the N-terminus includes the amino acid of SEQ ID NO: 32 in the entire amino acid sequence, thereafter, it is a known amino acid sequence or other feedback inhibition. Amino acid sequence with release mutations.
- the N-terminus from the entire amino acid sequence only includes the amino acid of SEQ ID NO: 33 from the entire amino acid sequence for feedback suppression, after which it may be a known amino acid sequence or an amino acid sequence containing other feedback suppression mutations. Can be.
- anthranilic acid synthase in the present application is defined as a polypeptide comprising the amino acid of SEQ ID NO: 32 or SEQ ID NO: 33, the amino acid of SEQ ID NO: 32 or 21, except that the position 38 is arginine It does not exclude mutations that can occur naturally in the amino acid sequence of SEQ ID NO: 33, except for serine, or its latent mutations, and are identical to polypeptides comprising the amino acid sequence of SEQ ID NO: 32 or SEQ ID NO: 33. Or it is apparent to those skilled in the art that if the corresponding activity corresponds to the anthranilic acid synthetase of the present application.
- an ansranilic acid synthase derived from the genus Corynebacterium microorganism of the present application includes that the position 38 is arginine, and the amino acid sequence of SEQ ID NO: 32 or 70%, 80%, 90%, 95 It may be a polypeptide consisting of an amino acid sequence having at least%, or 97% homology.
- the anthranilic acid synthetase derived from the genus Escherichia microorganism of the present application includes that the position 21 is serine, and the amino acid sequence of SEQ ID NO: 33 or 70%, 80%, 90%, 95%, or 97% thereof. It may be a polypeptide consisting of an amino acid sequence having the above homology.
- polypeptide having an amino acid sequence having such homology and exhibiting an efficacy corresponding to the polypeptide it is obvious that a polypeptide having an amino acid sequence in which some sequences are deleted, modified, substituted or added is also included within the scope of the present application.
- the term 'homology' or 'identity' refers to the degree of correlation with two given amino acid sequences or nucleotide sequences and may be expressed as a percentage.
- Sequence homology or identity of conserved polynucleotides or polypeptides is determined by standard alignment algorithms, and the default gap penalty established by the program used may be used together. Substantially, homologous or identical sequences are generally at least about 50%, 60%, 70%, 80% full or full-length in medium or high stringent conditions. Or 90% or more. Hybridization is also contemplated for polynucleotides containing degenerate codons instead of codons in polynucleotides.
- the homology, similarity, or identity of a polynucleotide or polypeptide is described, for example, in Smith and Waterman, Adv. Appl. As known from Math (1981) 2: 482, for example, Needleman et al. (1970), J Mol Biol. 48: 443, and can be determined by comparing the sequence information using a GAP computer program.
- the GAP program defines the total number of symbols in the shorter of the two sequences, divided by the number of similarly arranged symbols (ie, nucleotides or amino acids).
- the default parameters for the GAP program are (1) a binary comparison matrix (containing 1 for identity and 0 for non-identity) and Schwartz and Dayhoff, eds., Atlas Of Protein Sequence And Structure, National Biomedical Research Foundation, pp. As disclosed by 353-358 (1979), Gribskov et al (1986) Nucl. Acids Res. 14: weighted comparison matrix of 6745 (or EDNAFULL (EMBOSS version of NCBI NUC4.4) substitution matrix); (2) a penalty of 3.0 for each gap and an additional 0.10 penalty for each symbol in each gap (or gap opening penalty 10, gap extension penalty 0.5); And (3) no penalty for the end gap.
- the polynucleotide encoding the anthranilic acid synthase may be included without limitation so long as it is a sequence capable of encoding the anthranilic acid synthase.
- polynucleotide encoding the anthranilic acid synthase is within a range that does not change the amino acid sequence of the polypeptide due to the degeneracy of the codon or in consideration of the codon preferred in the organism to express the polypeptide. In the coding region, various modifications may be made. Meanwhile, the polynucleotide encoding the polypeptide may be a polynucleotide comprising a polynucleotide sequence having at least 70%, 80%, 90%, 95%, or 97% homology or identity thereto.
- polynucleotide sequence encodes a polypeptide having such homology or identity and exhibiting substantially the same or equivalent potency as the polypeptide
- polynucleotide sequences in which some sequences have been deleted, modified, substituted or added are also within the scope of the present application. Inclusion is self-evident.
- Probes that can be prepared from known gene sequences, such as the amino acid of SEQ ID NO: 32 or SEQ ID NO: 33, are hydrided under stringent conditions with complementary sequences to all or part of the polynucleotide sequence, for example. Any sequence encoding a polypeptide having the same or similar activity as the polypeptide consisting of the sequence can be included without limitation.
- stringent conditions refers to conditions that enable specific hybridization between polynucleotides. Such conditions are described specifically in the literature (eg, J. Sambrook et al., Homology). For example, genes with high homology, 70% or more, 80% or more, specifically 90% or more, more specifically 95% or more, more specifically 97% or more, particularly specifically 99% or more Genes having homologous hybridization and hybridization with less homologous genes, or 60 ° C, 1 ⁇ SSC, 0.1% SDS, specifically 60 ° C, 0.1 At the salt concentration and temperature corresponding to x SSC, 0.1% SDS, and more specifically 68 ° C., 0.1 ⁇ SSC, and 0.1% SDS, the conditions for washing once, specifically, two to three times can be enumerated.
- Hybridization requires that two nucleic acids have complementary sequences, although mismatch between bases is possible depending on the stringency of the hybridization.
- the term “complementary” is used to describe the relationship between bases of nucleotides that can hybridize with each other. For example, with respect to DNA, adenosine is complementary to thymine and cytosine is complementary to guanine.
- the present application may also include isolated nucleotide fragments that are complementary to the entire sequence as well as substantially similar nucleotide sequences.
- polynucleotides having homology can be detected using hybridization conditions including hybridization steps at Tm values of 55 ° C. and using the conditions described above.
- the Tm value may be 60 ° C, 63 ° C or 65 ° C, but is not limited thereto and may be appropriately adjusted by those skilled in the art according to the purpose.
- Proper stringency for hybridizing polynucleotides depends on the length and degree of complementarity of the polynucleotides and variables are well known in the art (see Sambrook et al., Supra, 9.50-9.51, 11.7-11.8).
- transketolase refers to xylulose-5-phosphate and erythrose 4-phosphate of fructose-6-phosphate and glyceraldehyde-3-phosphate (E4P, erythorse-4-). phosphate) (Kochetov, GA 1982, Transketolase from yeast, rat liver, and pig liver, Methods Enzymol., 90: 209-23). Tryptophan production originates from the aromatic amino acid metabolic cycle, which begins with the condensation reaction of phosphoenolpyruvate with erythrose 4-phosphate.
- smooth supply of two precursors is essential for improving tryptophan productivity, and it is intended to enhance the expression of the tkt gene for smooth supply of erythrose 4-phosphate as a precursor of tryptophan, which is known to be relatively insufficient in the present application.
- the transketorase of the present application has the above activity, those skilled in the art can obviously use the amino acid sequence having the activity regardless of the origin of the microorganism. Specifically, it may have a known amino acid sequence derived from Corynebacterium microorganisms or an amino acid sequence derived from Escherichia microorganisms, those skilled in the art can easily facilitate the amino acid sequence of transketorase through a database such as NCBI or Kegg Can be obtained. More specifically, the transketorase may be derived from Corynebacterium microorganisms, and even more specifically from Corynebacterium glutamicum. Specifically, Corynebacterium glutamicum-derived transketorase may use the nucleotide sequence of SEQ ID NO: 41 or the amino acid sequence of SEQ ID NO: 42.
- the term "enhanced / enhanced" a gene means a state in which the synthesis of the gene of interest into a functioning protein is increased compared to intrinsic or prior to modification.
- intrinsic refers to a state in which the parent strain originally had before the transformation, when the trait of the microorganism changes due to genetic variation caused by natural or artificial factors.
- the expression enhancement of the present application is to increase the intracellular copy number of the gene encoding the protein of interest, to introduce a mutation in the expression control sequence of the chromosomal gene encoding the protein, gene expression on the chromosome encoding the protein
- a method of replacing a regulatory sequence with a highly active sequence, a method of replacing a gene encoding the protein on a chromosome with a mutated gene to increase the protein activity, and a gene on the chromosome that encodes the protein to enhance the activity of the protein It may be made by any one or more methods selected from the group consisting of a method for introducing a mutation in. More specifically, the enhanced expression of the present application may be a substitution of a strong promoter for the promoter of the gene of interest.
- the copy number increase of the gene in the above is not particularly limited, but may be performed in a form operably linked to a vector, or by inserting into a chromosome in a host cell.
- a vector capable of replicating and functioning independently of the host, to which the polynucleotide encoding the protein of the present application is operably linked may be introduced into the host cell.
- a vector capable of inserting the polynucleotide into a chromosome in a host cell to which the polynucleotide is operably linked may be introduced into the chromosome of the host cell. Insertion of the polynucleotide into the chromosome can be by any method known in the art, for example by homologous recombination.
- modifying the expression control sequence to increase the expression of the polynucleotide is not particularly limited, but deletion, insertion, non-conservative or conservative substitution or their nucleic acid sequence to further enhance the activity of the expression control sequence. It can be carried out by inducing a variation in sequence in combination or by replacing with a nucleic acid sequence having stronger activity.
- the expression control sequence may include, but is not particularly limited to, a promoter, an operator sequence, a sequence encoding a ribosomal binding site, a sequence for controlling termination of transcription and translation, and the like.
- a strong promoter may be linked to the top of the polynucleotide expression unit instead of the original promoter, but is not limited thereto.
- Examples of known strong promoters include cj1 to cj7 promoters (Korean Patent No. 10-0620092), lac promoter, trp promoter, trc promoter, tac promoter, lambda phage PR promoter, P L promoter, tet promoter, gapA promoter, SPL7 Promoter, SPL13 (sm3) promoter (Korean Patent No. 10-1783170), O2 promoter (Korean Patent No. 10-1632642), tkt promoter and yccA promoter and the like, but is not limited thereto.
- modification of the polynucleotide sequence on the chromosome is not particularly limited, but the mutation in the expression control sequence by deletion, insertion, non-conservative or conservative substitution, or a combination thereof, to further enhance the activity of the polynucleotide sequence. Or by replacing with a polynucleotide sequence that has been modified to have stronger activity.
- the term "introduction" of a gene refers to the activity of a specific protein as it is expressed in the microorganism, which is not originally possessed by the microorganism, or to enhanced activity compared to the intrinsic or pre-modification activity of the protein. It means to appear.
- a polynucleotide encoding a specific protein may be introduced into a chromosome in a microorganism, or a vector containing a polynucleotide encoding a specific protein may be introduced into a microorganism to exhibit its activity.
- the introduction and enrichment of such protein activity is generally at least 1%, 10%, 25%, 50%, based on the activity or concentration of the protein in the wild type or unmodified microbial strain. 75%, 100%, 150%, 200%, 300%, 400% or 500%, up to 1000% or 2000% may be increased, but is not limited thereto.
- the term “microorganism that produces L-tryptophan” refers to a microorganism capable of producing an excess of L-tryptophan from a carbon source in the medium compared to wild-type or unmodified microorganisms.
- the microorganism producing L-tryptophan may be a recombinant microorganism.
- the type is not particularly limited, but the genus Enterbacter, Escherichia, Erwinia, Serratia, Providencia ( Providencia), Corynebacterium genus and Brevibacterium genus microorganisms. More specifically, it may be a microorganism belonging to the genus Escherichia or Corynebacterium.
- the microorganism of the genus Corynebacterium may be corynebacterium glutamicum, but the expression of the gene encoding tryptophan operon and transketorase is enhanced to produce L-tryptophan.
- Microorganisms belonging to this growing Corynebacterium genus can be included without limitation.
- Another aspect of the present application for achieving the above object is a gene encoding an ansranilic acid synthase with an N-terminus consisting of the amino acid sequence of SEQ ID NO: 32 and the feedback inhibition is released, and a tryptophan operon comprising the same; Culturing Corynebacterium genus microorganisms producing L-tryptophan, in which the expression of the gene encoding the transketorase is enhanced, in a medium; And it provides a method for producing L- tryptophan, comprising the step of recovering L-tryptophan from the cultured microorganism or medium.
- Ansranilate synthase, tryptophan operon, transketolase, L-tryptophan, and microorganisms having the N-terminus consisting of the amino acid sequence of SEQ ID NO: 32 or SEQ ID NO: 33 and whose feedback inhibition is released are as described above.
- the term "culture” means growing the microorganisms under appropriately controlled environmental conditions. Cultivation process of the present application may be made according to suitable media and culture conditions known in the art. This culture process can be easily adjusted and used by those skilled in the art according to the strain selected. Specifically, the culture may be batch, continuous and fed-batch, but is not limited thereto.
- the term "medium” means a substance mixed with nutrients necessary for culturing the microorganism as a main component, and supplies nutrients and growth factors, including water, which is indispensable for survival and development.
- the medium and other culture conditions used for the culture of the microorganism of the present application can be used without any particular limitation as long as the medium is used for the culture of ordinary microorganisms, the microorganism of the present application is suitable carbon source, nitrogen source, personnel, inorganic It can be cultured in a conventional medium containing a compound, an amino acid and / or vitamins, etc. under aerobic conditions, adjusting the temperature, pH and the like.
- the carbon source may include carbohydrates such as glucose, fructose, sucrose, maltose, mannitol, sorbitol, and the like; Alcohols such as sugar alcohols, glycerol, pyruvic acid, lactic acid, citric acid and the like; Amino acids such as organic acids, glutamic acid, methionine, lysine and the like.
- natural organic nutrients such as starch hydrolyzate, molasses, blackstrap molasses, rice winters, cassava, sugarcane residue and corn steep liquor can be used, specifically glucose and sterilized pretreated molasses (ie, reducing sugars).
- Carbohydrates, such as molasses), and other appropriate amounts of carbon sources can be used in various ways without limitation. These carbon sources may be used alone or in combination of two or more thereof, but are not limited thereto.
- nitrogen source examples include inorganic nitrogen sources such as ammonia, ammonium sulfate, ammonium chloride, ammonium acetate, ammonium phosphate, anmonium carbonate, and ammonium nitrate; Organic nitrogen sources such as amino acids such as glutamic acid, methionine, glutamine, etc., peptones, NZ-amines, meat extracts, yeast extracts, malt extracts, corn steep liquor, casein hydrolysates, fish or their degradation products, skim soy cakes or their degradation products Can be used. These nitrogen sources may be used alone or in combination of two or more thereof, but is not limited thereto.
- inorganic nitrogen sources such as ammonia, ammonium sulfate, ammonium chloride, ammonium acetate, ammonium phosphate, anmonium carbonate, and ammonium nitrate
- Organic nitrogen sources such as amino acids such as glutamic acid, methionine, glutamine, etc., peptones, NZ-amines
- the personnel may include a first potassium phosphate, a second potassium phosphate, or a sodium-containing salt corresponding thereto.
- a first potassium phosphate sodium chloride, calcium chloride, iron chloride, magnesium sulfate, iron sulfate, manganese sulfate, calcium carbonate and the like may be used, and other amino acids, vitamins and / or suitable precursors may be included. These components or precursors may be added batchwise or continuously to the medium. However, it is not limited to this.
- compounds such as ammonium hydroxide, potassium hydroxide, ammonia, phosphoric acid, sulfuric acid, and the like can be added to the medium in an appropriate manner to adjust the pH of the medium.
- antifoaming agents such as fatty acid polyglycol esters can be used to suppress bubble generation.
- oxygen or oxygen-containing gas into the medium or to inject nitrogen, hydrogen or carbon dioxide gas without the injection of gas to maintain the anaerobic and unaerobic state, It is not.
- the temperature of the medium may be 20 ° C to 50 ° C, specifically 30 ° C to 37 ° C, but is not limited thereto.
- the incubation period may continue until the desired amount of useful material is obtained, specifically, may be 10 hours to 100 hours, but is not limited thereto.
- the step of recovering tryptophan is to recover the desired L- tryptophan from the medium using a suitable method known in the art according to the culture method of the microorganism of the present application, for example, batch, continuous or fed-batch culture method.
- a suitable method known in the art for example, centrifugation, filtration, treatment with crystallized protein precipitation agent (salting method), extraction, ultrasonic crushing, ultrafiltration, dialysis, molecular sieve chromatography (gel filtration), adsorption chromatography, ion exchange chromatography, affinity chromatography
- Various chromatography such as HPLC, HPLC and the like can be used in combination, but is not limited to these examples.
- the recovery step may comprise an additional purification process.
- the purification process may purify the recovered L-tryptophan using any suitable method known in the art.
- the present application provides a gene encoding an anslanylic acid synthase, wherein the N-terminus is composed of the amino acid sequence of SEQ ID 32, and the feedback inhibition is released, and a tryptophan operon and transketorase comprising the same. It provides the use of L-tryptophan production of Corynebacterium microorganism with enhanced expression of the gene.
- the present application provides a gene encoding a feedback released anthranilic acid synthetase having an N-terminus consisting of the amino acid sequence of SEQ ID NO: 33 and an E. coli-derived tryptophan operon in addition to the microorganism. It provides for the production of L-tryptophan of the Corynebacterium microorganism modified as possible.
- the trpE promoter Upstream and trpE 38 Downsteam regions where chromosomal homologous recombination occurs were obtained. Specifically, the trpE promoter upstream region using the primers of SEQ ID NO: 1 and SEQ ID NO: 2, using Corynebacterium glutamicum ATCC13869 chromosomal DNA as a template, and trpE using the primers of SEQ ID NO: 3 and SEQ ID NO: 4 Gene fragments in the Downsteam region of mutation 38 were obtained by PCR.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec denaturation, 60 ° C. 30 sec annealing, and 72 ° C. 60 sec polymerization 30 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- PCR was performed using primers of SEQ ID NO: 6 and SEQ ID NO: 7 as a template using a synthetically produced promoter SPL7 (SEQ ID NO: 5, Korean Patent No. 10-1783170).
- Solg TM Pfu-X DNA polymerase (SolGent co.) was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 seconds denaturation, 62 ° C. 30 seconds annealing, and 72 ° C. 30 seconds polymerization. After repeating 30 times, the polymerization was performed at 72 ° C. for 5 minutes.
- PCR was performed using primers of SEQ ID NO: 8 and SEQ ID NO: 9 using Corynebacterium glutamicum genomic DNA as a template to obtain fragments before trpE 38 from Corynebacterium glutamicum. .
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec. Denaturation, 62 ° C. 30 sec. Annealing, and 72 ° C. 30 sec. Polymerization 30 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- the amplified trpE promoter upstream and trpE 38 mutation downstream region, the SPL7 promoter and trpE 38 frontal fragment, and the chromosome transformation vector pDZ (patented 10-0924065) cleaved with SmaI restriction enzyme were obtained from the Gibson assembly ( Recombinant plasmids were obtained by cloning using DG Gibson et al., NATURE METHODS, VOL. 6 NO.5, MAY 2009, NEBuilder HiFi DNA Assembly Master Mix) method and named pDZ-PSPL7-trpE (S38R). Cloning was performed by mixing Gibson assembly reagent and each of the gene fragments in the calculated moles and then preserving at 50 ° C. for 1 hour.
- the produced pDZ-PSPL7-trpE (S38R) vector was transformed into wild-type Corynebacterium glutamicum ATCC13869 strain by electroporation, followed by a second crossover process, and a stronger promoter of the SPL7 promoter, a promoter of trp operon, on the chromosome. And the amino acid No. 38 of TrpE was replaced with serine to arginine (SEQ ID NO: 32). This genetic manipulation was confirmed by PCR and genome sequencing using SEQ ID NO: 10 and SEQ ID NO: 11, which can amplify the external regions of the homologous recombination upstream and downstream regions where the gene was inserted, and named CA04-8325. It was.
- the trpE (S38R) upstream region was sequenced using primers of SEQ ID NO: 1 and SEQ ID NO: 3 with Corynebacterium glutamicum ATCC13869 chromosomal DNA as a template. Using the primer of SEQ ID NO: 4, a gene fragment of the Downsteam region of the trpE 38 mutation was obtained through PCR.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec denaturation, 60 ° C. 30 sec annealing, and 72 ° C. 60 sec polymerization 30 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- Recombinant plasmids were obtained by cloning the trpE (S38R) upstream and trpE (S38R) downstream fragments amplified by the above method, and the vector pDZ for chromosomal transformation cleaved with SmaI restriction enzyme using the Gibson assembly method, and the pDZ- Named trpE (S38R). Cloning was performed by mixing Gibson assembly reagent and each of the gene fragments in the calculated moles and then preserving at 50 ° C. for 1 hour.
- PDZ-trpE (S38R) vector was transformed into wild-type Corynebacterium glutamicum ATCC13869 strain by electroporation, followed by a crossover process, and amino acid 38 of TrpE was identified on serine on the chromosome. Strains were replaced with those obtained. The genetic manipulation was confirmed by PCR and genome sequencing using SEQ ID NO: 10 and SEQ ID NO: 11, which can amplify the external regions of the homologous upstream and downstream regions where the gene was inserted, and named CA04-8312. It was.
- the trpE promoter upstream region was identified using primers of SEQ ID NO: 1 and SEQ ID NO: 2 using the Corynebacterium glutamicum ATCC13869 chromosomal DNA as a template. Using the primers of SEQ ID NO: 8 and SEQ ID NO: 4, gene fragments of the trpE promoter downstream (Downsteam) region were obtained through PCR.
- PCR was performed using primers of SEQ ID NO: 6 and SEQ ID NO: 7 using the synthetic promoter SPL7 as a template.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec denaturation, 60 ° C. 30 sec annealing, and 72 ° C. 60 sec polymerization 30 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- Recombinant plasmids were obtained by cloning the trpE promoter upstream, trpE promoter downstream and SPL7 promoter fragments amplified by the above method, and chromosome transformation vector pDZ digested with SmaI restriction enzymes using the Gibson assembly method, and pDZ-SPL7_trpE Named it. Cloning was performed by mixing Gibson assembly reagent and each of the gene fragments in the calculated moles and then preserving at 50 ° C. for 1 hour.
- the pDZ-SPL7_trpE vector prepared by the above process was transformed into wild-type Corynebacterium glutamicum ATCC13869 strain by electroporation, and then replaced by the SPL7 promoter, which is a trp operon strong promoter on the chromosome, through a second crossover process.
- SPL7 promoter which is a trp operon strong promoter on the chromosome
- This genetic manipulation was confirmed by PCR and genome sequencing using SEQ ID NO: 10 and SEQ ID NO: 11, which can amplify the external regions of the homologous upstream and downstream regions where the gene was inserted, and named CA04-8315. It was.
- the sequence of the primer used in this Example is as follows.
- SEQ ID NO: 1 (Pspl7-trpE (S38R) _L-1) TCGAGCTCGGTACCCAAACAACTGCGACGTGTGTC SEQ ID NO: 2 (Pspl7-trpE (S38R) _L-2) CATGAAGCGCCGGTACCTTAATCATTTTTGGGTTC SEQ ID NO: 3 (Pspl7-trpE (S38R) _R-1) GCCCTGTTGGAACGCGCTGATATCACCACCAAGAA SEQ ID NO: 4 (Pspl7-trpE (S38R) _R-2) CTCTAGAGGATCCCCAGATGTCACCGTTGTAAATG SEQ ID NO: 6 (Pspl7-1) CCCAAAAATGATTAAGGTACCGGCGCTTCATGTCA SEQ ID NO: 7 (Pspl7-2) GGGATTCGTGCTCATGATATCTGTTTTGATCTCCTCC SEQ ID NO: 8 (trpE (S
- Corynebacterium glutamicum ATCC13869 chromosomal DNA was used as a template for the genetic manipulation, and the upstream region to additionally insert the tkt gene was identified using SEQ ID NO: 12 and SEQ ID NO: 13, SEQ ID NO: 14 and SEQ ID NO: 15 Gene fragments in the Downsteam region where additional tkt genes were inserted were obtained by performing PCR.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 2 minutes, 95 ° C. 20 seconds denaturation, 62 ° C. 40 seconds annealing, 72 ° C. 30 seconds polymerization, and repeated 27 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- PCR was performed on the tkt gene fragment containing the tkt promoter using SEQ ID NO: 16 and SEQ ID NO: 17 using the Corynebacterium glutamicum ATCC13869 chromosomal DNA of a wild species as a template. Obtained through.
- Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were repeated for 2 minutes at 95 ° C., followed by 95 ° C. 20 seconds denaturation, 62 ° C. 40 seconds annealing, and 72 ° C. 1 minute 20 seconds polymerization. After that, the polymerization was carried out at 72 ° C. for 5 minutes.
- the upstream to which the amplified tkt gene is to be inserted and the downstream region to which the tkt gene is to be inserted, the tkt gene including the tkt promoter, and the chromosome transformation vector pDZ cleaved with SmaI restriction enzyme were cloned using the Gibson assembly method. Recombinant plasmids were obtained and named pDZ-Pn-tkt. Cloning was performed by mixing Gibson assembly reagent and each of the gene fragments in the calculated moles and then preserving at 50 ° C. for 1 hour.
- the produced pDZ-Pn-tkt vector was transformed into ATCC13869 and CJ04-8325 strains by electroporation, and a second crossover process was performed to obtain a strain in which a tkt gene including a tkt promoter was inserted on a chromosome.
- the genetic manipulations were confirmed by PCR and genome sequencing using the SEQ ID NO: 18 and SEQ ID NO: 19 primers to amplify the external regions of the upstream and downstream regions of the homologous recombination where the gene was inserted. 8321 and CA04-8352.
- the sequence of the primer used in this Example is as follows.
- SEQ ID NO: 12 (Pn-tkt_L-1) TCGAGCTCGGTACCCAAACTTTGAGTGGGTGCGTG SEQ ID NO: 13 (Pn-tkt_L-2) TCGAGCTACGAGGGCGGTTCCCAGCCCTTCATTAG SEQ ID NO: 14 (Pn-tkt_R-1) ATTAACGGTTAATTGATTCTGGACGTCATGACTAC SEQ ID NO: 15 (Pn-tkt_R-2) CTCTAGAGGATCCCCGCCTCGATGATGCAGTCGTC SEQ ID NO: 16 (Pn-tkt-1) GAAGGGCTGGGAACCGCCCTCGTAGCTCGAGAGTT SEQ ID NO: 17 (Pn-tkt-2) CATGACGTCCAGAATCAATTAACCGTTAATGGAGTCC SEQ ID NO: 18 (Confirm_Pn-tkt-1) ACCCAGAACCCCAAATTTTC SEQ ID NO: 19 (Confirm_Pn-tkt-2) TTGAG
- Glucose 30 g (NH 4 ) 2 SO 4 15 g, MgSO 4 7H 2 O 1.2 g, KH 2 PO 4 1 g, yeast extract 5 g, biotin 900 ⁇ g, thiamine hydrochloride 4500 ⁇ g, calcium-pantothenic acid 4500 ⁇ g, CaCO 3 30 g (based on 1 liter of distilled water).
- Tryptophan production was not confirmed in CA04-8312, a strain that releases feedback in trpE of wild-type Corynebacterium, CA04-8315, which has enhanced expression of tryptophan operon, and CA04-8321, which has enhanced tkt.
- CA04-8352 strain which combines these individual traits, produced about five times improved tryptophan compared to CA04-8325. This means that tryptophan operon enrichment with release of feedback to tryptophan and tkt expression enhancement should be combined to improve tryptophan production.
- the wild type Corynebacterium microorganisms produce only a very small amount of tryptophan, even if they do not produce tryptophan.
- the promoter upstream and trpDCBA Downsteam regions where chromosomal homologous recombination takes place were first obtained. Specifically, using the primers of SEQ ID NO: 20 and SEQ ID NO: 21 using the Corynebacterium glutamicum chromosomal DNA as a template, the promoter upstream region was used, and the primers of SEQ ID NO: 22 and SEQ ID NO: 23 were further downstream ( Gene fragments from the Downsteam region were obtained by PCR.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec. Denaturation, 58 ° C. 30 sec. Annealing, and 72 ° C. 60 sec. Polymerization 30 times. The polymerization was carried out at 72 ° C. for 5 minutes.
- PCR was performed using primers of SEQ ID NO: 24 and SEQ ID NO: 25 using the synthetically produced promoter SPL7 as a template.
- Polymerase was used Solg TM Pfu-X DNA polymerase (SolGent co.), PCR amplification conditions were denatured at 95 °C for 5 minutes, 95 °C 30 seconds denaturation, 58 °C 30 seconds annealing, 72 °C 60 seconds polymerization After repeating 30 times, the polymerization was performed at 72 ° C. for 5 minutes.
- PCR was performed using SEQ ID NO: 26 and SEQ ID NO: 27 using E. coli W3110 genomic DNA as a template.
- Solg TM Pfu-X DNA polymerase As polymerase, Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec. Denaturation, 58 ° C. 30 sec. Annealing, and 72 ° C. 30 sec. The polymerization was carried out at 72 ° C. for 5 minutes.
- PCR was performed using E. coli W3110 genomic DNA as a template.
- Solg TM Pfu-X DNA polymerase was used, and PCR amplification conditions were denatured at 95 ° C. for 5 minutes, 95 ° C. 30 sec. Denaturation, 58 ° C. 30 sec. Annealing, and 72 ° C. 7 min polymerization 30 times. The polymerization was carried out at 72 ° C. for 10 minutes.
- Recombinant plasmids were obtained by cloning using the Gibson assembly method and named pDZ-PSPL7-trpE (P21S) DCBA.eco. Cloning was performed by mixing Gibson assembly reagent and each of the gene fragments in the calculated moles and then preserving at 50 ° C. for 1 hour.
- the pDZ-PSPL7-trpE (P21S) DCBA.eco vector was transformed into wild-type Corynebacterium glutamicum ATCC13869, CJ04-8321 and CJ04-8352 strains by electroporation, followed by a second crossover process, followed by chromosomes.
- the genetic manipulations were confirmed by PCR and genome sequencing using the SEQ ID NO: 30 and SEQ ID NO: 31 primers, which can amplify the external regions of the upstream and downstream regions of the homologous recombination where the gene was inserted. 8316, CA04-8330 and CA04-8357.
- the sequence of the primer used in this Example is as follows.
- CA04-8330 and CA04-8357 strains prepared in Example 4 and the CA04-8352 strain prepared in Example 2 was cultured in the following manner. Each strain was inoculated into a 250 ml corner-baffle flask containing 25 ml of seed medium and shaken at 200 rpm for 20 hours at 30 ° C. Thereafter, 1 ml of the seed culture was inoculated into a 250 ml corner-baffle flask containing 25 ml of production medium and shake-cultured at 200 rpm for 24 hours. After the incubation, the production amount of L-tryptophan was measured by HPLC.
- Glucose 30 g (NH 4 ) 2 SO 4 15 g, MgSO 4 7H 2 O 1.2 g, KH 2 PO 4 1 g, yeast extract 5 g, biotin 900 ⁇ g, thiamine hydrochloride 4500 ⁇ g, calcium-pantothenic acid 4500 ⁇ g, CaCO 3 30 g (based on 1 liter of distilled water).
- Tryptophan operon expression-enhanced strain CA04-8316 containing E. coli-derived trpE released wild-type Corynebacterium produced L-tryptophan at 0.03 g / L
- CA04-8321 enhanced with tkt only
- the yield of tryptophan of the strain CA04-8330 enhanced with the release of E. coli-derived tryptophan operon was improved to 0.32 g / L.
- tryptophan production was expected to be about 0.3-0.6 g / L, but it produced 2.72 g / L, which is about 10 times better than CA04-8352.
- KCCM Korea Microorganism Conservation Center
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Abstract
Description
서열번호 1 (Pspl7-trpE(S38R)_L-1) | TCGAGCTCGGTACCCAAACAACTGCGACGTGTGTC |
서열번호 2 (Pspl7-trpE(S38R)_L-2) | CATGAAGCGCCGGTACCTTAATCATTTTTGGGTTC |
서열번호 3 (Pspl7-trpE(S38R)_R-1) | GCCCTGTTGGAACGCGCTGATATCACCACCAAGAA |
서열번호 4 (Pspl7-trpE(S38R)_R-2) | CTCTAGAGGATCCCCAGATGTCACCGTTGTAAATG |
서열번호 6 (Pspl7 - 1) | CCCAAAAATGATTAAGGTACCGGCGCTTCATGTCA |
서열번호 7 (Pspl7 - 2) | GGGATTCGTGCTCATGATATCTGTTTTGATCTCCTCC |
서열번호 8 (trpE (S38R) - 1) | ATCAAAACAGATATCATGAGCACGAATCCCCATGT |
서열번호 9 (trpE (S38R) - 2) | GTGGTGATATCAGCGCGTTCCAACAGGGCTGCATC |
서열번호 10(Confirm_Pspl7-trpE(S38R) - 1) | GAAGAAGAGGCTGCAGATG |
서열번호 11 (Confirm_Pspl7-trpE(S38R) - 2) | GATCAGCGCCATCATGTT |
서열번호 12 (Pn-tkt_L - 1) | TCGAGCTCGGTACCCAAACTTTGAGTGGGTGCGTG |
서열번호 13 (Pn-tkt_L - 2) | TCGAGCTACGAGGGCGGTTCCCAGCCCTTCATTAG |
서열번호 14 (Pn-tkt_R - 1) | ATTAACGGTTAATTGATTCTGGACGTCATGACTAC |
서열번호 15 (Pn-tkt_R - 2) | CTCTAGAGGATCCCCGCCTCGATGATGCAGTCGTC |
서열번호 16 (Pn-tkt - 1) | GAAGGGCTGGGAACCGCCCTCGTAGCTCGAGAGTT |
서열번호 17 (Pn-tkt - 2) | CATGACGTCCAGAATCAATTAACCGTTAATGGAGTCC |
서열번호 18 (Confirm_Pn-tkt - 1) | ACCCAGAACCCCAAATTTTC |
서열번호 19 (Confirm_Pn-tkt - 2) | TTGAGTTCGACAACTTTGG |
형질 | 사용한 포도당(g/L) | 트립토판 생산량 (g/L) | 트립토판 수율 (*100 g/g, %) | |
ATCC13869 | 30 | 0.00 | 0.00 | |
CA04-8312 | trpE::trpE(S38R) | 30 | 0.00 | 0.00 |
CA04-8315 | Pn::SPL7_trpE | 30 | 0.00 | 0.00 |
CA04-8321 | ::Pn_tkt | 30 | 0.00 | 0.00 |
CA04-8325 | Pn::SPL7_trpE(S38R) | 30 | 0.05 | 0.16 |
CA04-8352 | SPL7_trpE(S38R), ::Pn_tkt | 30 | 0.27 | 0.90 |
서열번호 20 (TY384) | ttcgagctcggtacccGATCGAGGCTAACAAGGCA |
서열번호 21 (HR-sp R) | GGTACCACTAAACCGGAAGGGCCCTCCTGCTGTACTTTCGACA |
서열번호 22 (trpA-HR F) | AGTTAAACTAAACAGGAAGAGCCAGTTAAGGGAC |
서열번호 23 (HR-vector R) | gactctagaggatccccATCATGGGAATCCGGCCAT |
서열번호 24 (HR-sp F) | GGCCCTTCCGGTTTAGTGGTACCGGCGCTTCATGTCAACAATC |
서열번호 25 (spl7-trpE R) | TTTGCATGATATCTGTTTTGATCTCCTCCAATA |
서열번호 26 (spl7-trpE F) | CAAAACAGATATCATGCAAACACAAAAACCGAC |
서열번호 27 (trpE P21S R) | GAAAAAGCGCGGTGGAATTGTCGCGATAAGCGC |
서열번호 28 (trpE P21S F) | CAAAACAGATATCATGCAAACACAAAAACCGAC |
서열번호 29 (trpA-HR R) | TCTTCCTGTTTAGTTTAACTGCGCGTCGCCGCTT |
서열번호 30 (Nested 1F) | CGTTGACCCAAACATGCTG |
서열번호 31 (Nested 1R) | CTTCTTCATTTCGGCTATCG |
형질 | 사용한 포도당(g/L) | 트립토판 생산량 (g/L) | 트립토판 수율 (*100 g/g, %) | |
ATCC13869 | 30 | 0.00 | 0.00 | |
CA04-8316 | ::SPL7_trpE(P21S)DCBA.eco | 30 | 0.03 | 0.10 |
CA04-8330 | ::Pn_tkt, ::SPL7_trpE(P21S)DCBA.eco | 30 | 0.32 | 1.06 |
CA04-8352 | SPL7_trpE(S38R), ::Pn_tkt | 30 | 0.27 | 0.90 |
CA04-8357 | SPL7_trpE(S38R), ::Pn_tkt, ::SPL7_trpE(P21S)DCBA.eco | 30 | 2.72 | 9.06 |
Claims (8)
- N-말단이 서열번호 32의 아미노산 서열로 구성되고 피드백 저해가 해제된 안스라닐산 합성효소를 코딩하는 유전자와 이를 포함하는 트립토판 오페론 및 트랜스케토라제를 코딩하는 유전자의 발현이 강화된, L-트립토판을 생산하는 코리네박테리움속 미생물.
- 제1항에 있어서, 상기 트립토판 오페론 발현의 강화는 트립토판 오페론의 프로모터가 강한 프로모터로 치환된, L-트립토판을 생산하는 코리네박테리움속 미생물.
- 제1항에 있어서, 상기 미생물은 추가적으로 N-말단이 서열번호 33의 아미노산 서열로 구성된 피드백 해제된 안스라닐산 합성효소를 코딩하는 유전자와 이를 포함하는 대장균 유래 트립토판 오페론이 발현되도록 변형된, L-트립토판을 생산하는 코리네박테리움속 미생물.
- 제3항에 있어서, 상기 대장균 유래 트립토판 오페론은 트립토판 오페론의 프로모터가 강한 프로모터로 치환된, L-트립토판을 생산하는 코리네박테리움속 미생물.
- 제1항에 있어서, 상기 미생물은 코리네박테리움 글루타미쿰인, L-트립토판을 생산하는 코리네박테리움속 미생물.
- N-말단이 서열번호 32의 아미노산 서열로 구성되고 피드백 저해가 해제된 안스라닐산 합성효소를 코딩하는 유전자와 이를 포함하는 트립토판 오페론 및 트랜스케토라제를 코딩하는 유전자의 발현이 강화된 L-트립토판을 생산하는 코리네박테리움속 미생물을 배지에서 배양하는 단계; 및 상기 배양된 미생물 또는 배지로부터 L-트립토판을 회수하는 단계를 포함하는, L-트립토판 생산 방법.
- 제6항에 있어서, 상기 미생물은 추가적으로 N-말단이 서열번호 33의 아미노산 서열로 구성된 피드백 해제된 안스라닐산 합성효소를 코딩하는 유전자와 이를 포함하는 대장균 유래 트립토판 오페론이 발현되도록 변형된, L-트립토판 생산 방법.
- 제6항에 있어서, 상기 미생물은 코리네박테리움 글루타미쿰인, L-트립토판 생산 방법.
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KR102205717B1 (ko) | 2019-04-05 | 2021-01-22 | 씨제이제일제당 주식회사 | 신규 l-트립토판 배출 단백질 변이체 및 이를 이용한 l-트립토판을 생산하는 방법 |
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KR102278000B1 (ko) * | 2020-03-17 | 2021-07-15 | 씨제이제일제당 주식회사 | 프리페네이트 디하이드라타아제 활성 강화를 통한 l-트립토판을 생산하는 방법 |
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