WO2019107516A1 - 3-ヒドロキシアジピン酸、α-ヒドロムコン酸および/またはアジピン酸を生産するための遺伝子改変微生物および当該化学品の製造方法 - Google Patents
3-ヒドロキシアジピン酸、α-ヒドロムコン酸および/またはアジピン酸を生産するための遺伝子改変微生物および当該化学品の製造方法 Download PDFInfo
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- the present invention relates to a genetically modified microorganism in which a nucleic acid encoding a polypeptide involved in production of a target substance is introduced, or in which expression of the polypeptide is enhanced, and a method for producing a substance using the microorganism.
- 3-hydroxyadipic acid (IUPAC name: 3-hydroxyhexanedioic acid), ⁇ -hydromuconic acid (IUPAC name: (E) -hex-2-enedioic acid) and adipic acid (IUPAC name: hexanedioic acid) are dicarbons having 6 carbon atoms It is an acid. These can be used as polyesters by polymerizing with polyhydric alcohols and as raw materials of polyamides by polymerizing with polyhydric amines. In addition, ammonia can be added to these ends to lactamize, which can be a raw material of polyamide alone.
- 3-hydroxyadipate (3-hydroxyadipate) is described as a metabolic intermediate generated in microorganisms in the pathway for biosynthesis of butadiene.
- Patent Document 2 As an example of literature related to biosynthesis of ⁇ -hydromuconic acid using microorganisms, trans, trans-muconic acid from succinyl-CoA is disclosed in Patent Document 2 relating to production of muconic acid using non-naturally occurring microorganisms.
- ⁇ -hydromuconic acid (2,3-dehydroadipate) is described as a metabolic intermediate generated in microorganisms in the biosynthetic pathway.
- Patent documents 1 and 2 describe the metabolic pathway which can produce 3-hydroxyadipic acid or ⁇ -hydromuconic acid in the microorganism, but stop the metabolism with 3-hydroxyadipic acid or ⁇ -hydromuconic acid, and the culture solution There is no mention of secretion inside. Also, using non-naturally occurring microorganisms into which a nucleic acid encoding an enzyme catalyzing the reaction of reducing 3-oxoadipyl-CoA to 3-hydroxyadipyl-CoA described in Patent Documents 1 to 3 is actually used. It has not been tested whether 3-hydroxyadipic acid, ⁇ -hydromuconic acid or adipic acid can be produced.
- a genetically modified microorganism in which a nucleic acid encoding an enzyme exhibiting an excellent activity in a reduction reaction using 3-oxoadipyl-CoA as a substrate is introduced, or expression of the enzyme is enhanced, and production of a substance using the modified microorganism Intended to provide a method.
- the inventors of the present invention conducted extensive studies to achieve the above object, and as a result, a group of polypeptides having similar amino acid sequences catalyzed a reaction of reducing 3-oxoadipyr-CoA to 3-hydroxyadipyr-CoA It has been found to show activity, and the present invention has been completed.
- the present invention provides the following.
- the 13th amino acid residue from the N terminal side is phenylalanine or leucine
- the 15th amino acid residue from the N terminal side is leucine or glutamine
- the N terminal The 16th amino acid residue from the side is lysine or asparagine
- the 17th N amino acid residue is glycine or serine
- the 19th amino acid residue from the N terminal is proline or arginine
- N The genetically modified microorganism according to (2), wherein the 21st amino acid residue from the terminal side is preferably leucine, methionine or valine.
- the genetically modified microorganism according to any one of (1) to (3) which is a genetically modified version of a microorganism selected from the group consisting of Escherichia, Serratia, Hafnia and Pseudomonas.
- (1) to (4) having the ability to form 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA, and the ability to form 3-hydroxyadipate from 3-hydroxyadipyl-CoA, The genetically modified microorganism according to any one of the above 1.).
- a method for producing ⁇ -hydromuconic acid comprising culturing the genetically modified microorganism according to any one of (1) to (4) and (6) in a medium containing a carbon source as a fermentation raw material .
- a method for producing adipic acid which comprises culturing the genetically modified microorganism according to any one of (1) to (4) and (7) in a medium containing a carbon source as a fermentation source.
- a gene in which a nucleic acid encoding a polypeptide encoded by a 3-hydroxybutyryl-CoA dehydrogenase gene constituting a gene cluster and a 5-aminolevulinate synthase gene in a microorganism belonging to the genus Serratia, or a gene having enhanced expression of the polypeptide A method for producing one or more substances selected from the group consisting of 3-hydroxyadipic acid, ⁇ -hydromuconic acid and adipic acid, which comprises culturing a modified microorganism in a medium containing a carbon source as a fermentation source.
- the genetically modified microorganism according to the present invention expresses an enzyme that exhibits excellent activity in the reduction reaction from 3-oxoadipyl-CoA to 3-hydroxyadipyl-CoA, so It excels in the productivity of the produced 3-hydroxyadipic acid, ⁇ -hydromuconic acid and / or adipic acid.
- the method for producing a substance according to the present invention uses genetically modified microorganisms excellent in the productivity of 3-hydroxyadipic acid, ⁇ -hydromuconic acid and / or adipic acid produced via 3-hydroxyadipyl-CoA.
- the productivity of substances can be greatly improved.
- the microorganism of the present invention is a genetically modified microorganism into which a nucleic acid encoding the polypeptide described in (a) to (c) below has been introduced or the expression of the polypeptide has been enhanced.
- A The polypeptide consisting of the amino acid sequence of any of SEQ ID NOs: 1 to 6 and 213
- a polypeptide (c) sequence comprising an amino acid sequence which is deleted, inserted and / or added and which catalyzes a reaction of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA Having an identity of 70% or more to the amino acid sequence described in any of Nos. 1-6 and 213, and an activity of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA Polypeptide having
- 3-oxoadipyl-CoA reductase an enzyme that catalyzes a reaction of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA is referred to as "3-oxoadipyl-CoA reductase”.
- 3-hydroxyadipic acid may be abbreviated as 3HA, ⁇ -hydromuconic acid as HMA, and adipic acid as ADA.
- introducing nucleic acid refers to introducing a nucleic acid from the outside of the microorganism into the inside of the cell to give the microorganism the ability to produce the polypeptide encoded by the nucleic acid.
- the method of introduction is not particularly limited, and a method of incorporating the nucleic acid into an expression vector capable of autonomous replication in the microorganism and introducing it into a host microorganism, a method of incorporating the nucleic acid into the genome of the microorganism, and the like can be used.
- enhancing expression of a polypeptide refers to enhancing expression of a polypeptide originally possessed by a microorganism.
- the method of enhancing expression is not particularly limited, a method of increasing the copy number of a nucleic acid encoding the polypeptide, a method of modifying a promoter region upstream of the coding region of the polypeptide and a ribosome binding sequence can be mentioned. These methods may be performed alone or in combination.
- nucleic acids may be introduced. Also, introduction of nucleic acid may be combined with enhancement of expression of polypeptide.
- the amino acid sequence comprises one or several amino acids substituted, deleted, inserted and / or added, and 3-oxoadipyl
- the range of "one or several” is preferably 10 or less, more preferably 5 or less, particularly preferably 4 or less, and most preferably 1 or 2 for a polypeptide having an enzyme activity of -CoA reductase It is within.
- conservative substitution when an amino acid is substituted, the activity of the polypeptide is likely to be maintained when it is substituted with an amino acid having similar properties (so-called conservative substitution).
- the 20 kinds of amino acids constituting the natural protein are neutral amino acids (Gly, Ile, Val, Leu, Ala, Met, Pro) having a low polarity side chain, and neutral amino acids (Asn) having a hydrophilic side chain. , Gln, Thr, Ser, Tyr, Cys), acidic amino acids (Asp, Glu), basic amino acids (Arg, Lys, His), aromatic amino acids (Phe, Tyr, Trp) such as those having similar properties And the substitution among them often does not change the properties of the polypeptide.
- Sequence identity for a polypeptide having 70% or more sequence identity to the amino acid sequence of any one of SEQ ID NOs: 1-6 and 213, and having the enzyme activity of 3-oxoadipyl-CoA reductase, used in the present invention 80% or more is preferable, More preferably, it is 85% or more, More preferably, it is 90% or more, More preferably, it is 95% or more, More preferably, it is 97% or more, More preferably, it is 99% or more.
- sequence identity refers to all amino acid sequences that overlap in an optimal alignment when aligning two amino acid sequences or nucleotide sequences with or without introducing a gap (translation It means the ratio (percentage) of the same amino acid or base to the starting amino acid (including the starting amino acid) or the base sequence (including the start codon), which is calculated according to formula (1).
- the shorter sequence length to be compared is 400 amino acids or more, and in the case of less than 400 amino acids, sequence identity is not defined. Sequence identity can be easily checked using BLAST (Basic Local Alignment Search Tool), which is a commonly used algorithm in this field.
- BLAST is available to anyone from websites such as the National Center for Biotechnology Information (NCBI) and Kyoto Encyclopedia of Genes and Genomes (KEGG), and can easily determine sequence identity using default parameters. .
- sequence identity can also be determined using similar functions incorporated in software such as Genetyx.
- Sequence identity (%) number of matches (gaps are not counted) / shorter sequence length (length not including gaps at both ends) ⁇ 100 (1)
- SEQ ID NO: 2 when the sequence identity between the amino acid sequences described in SEQ ID NOs: 1 to 6 and 213 is calculated using Genetyx's function (% Identity Matrix), SEQ ID NO: 2 with the lowest sequence identity value The value of 4 is 71.51%, and the amino acid sequences of SEQ ID NOs: 1 to 6 and 213 have at least 70% or more sequence identity with each other.
- the calculation results of sequence identity using Genetyx are shown in Table 1. In Tables 1 to 5 below, the numbers on the leftmost side indicate the sequence numbers.
- Each amino acid sequence shown in SEQ ID NOs: 1 to 6 and 213 is used as Query, and the sequence identity with all amino acid sequences registered in NCBI's amino acid database (Non-redundant protein sequences) is checked using BLASTP. All the sequences having 70% or more of sequence identity were derived from Serratia bacteria.
- amino acid residues 15 to 38 from the N terminal side may simply be represented as “15 to 38 a.a.”
- Xaa is any amino acid residue, but 13a.a. is preferably phenylalanine or leucine, 15a.a. is preferably leucine or glutamine, 16a.a. is preferably lysine. Or asparagine, 17a.a.
- Consensus sequence 1 corresponds to an NAD + binding residue and amino acid residues around it. NAD + binding residues are described in Biochimie. 2012 Feb; 94 (2): 471-8. As shown in the above, it is characterized in that the 24th amino acid residue of consensus sequence 1 is aspartic acid, but the consensus sequence 1 is asparagine.
- consensus sequence 1 the polypeptides set forth in SEQ ID NOs: 1-6 and 213 are considered to exhibit excellent enzymatic activity as 3-oxoadipyl-CoA reductase.
- polypeptides described in (b) and (c) above also preferably have a consensus sequence 1 consisting of 24 amino acid residues shown in SEQ ID NO: 212 within 1 to 200 aa. More preferred consensus sequences are within 1 to 150 a.a., more preferably within 1 to 100 a.a. Specific examples thereof include the amino acid sequences of SEQ ID NOs: 7-16 and 70-138. The amino acid sequences of SEQ ID NOs: 7-16 and 70-138 have a consensus sequence 1 consisting of 24 amino acid residues as shown in SEQ ID NO: 212 in 15-38 a.a.
- amino acid sequences of SEQ ID NOS: 7 to 16 and 70 to 138 have sequence identity of 90% or more with the amino acid sequence of any of SEQ ID NOs: 1 to 6 and 213.
- sequence identity using Genetyx are shown in Tables 2-1 to 2-3 and Tables 3-1 to 3-3.
- the nucleic acid encoding the polypeptide according to (a) to (c) of the present invention may contain a sequence such that an additional peptide or protein is added to the N-terminus and / or C-terminus of the polypeptide.
- an additional peptide or protein is added to the N-terminus and / or C-terminus of the polypeptide.
- peptides or proteins for example, those containing secretory signal sequences, transport proteins, binding proteins, tag peptides for purification, fluorescent proteins and the like can be exemplified.
- those skilled in the art can select a peptide or protein having an addition function according to the purpose and add it to the polypeptide of the present invention.
- the sequence identity of the amino acid sequence does not include such a peptide or protein.
- the nucleic acid encoding the polypeptide set forth in SEQ ID NOs: 1-16, 70-138 or 213 is particularly limited as long as it is a base sequence that can be translated into the amino acid sequence set forth in SEQ ID NOs: 1-16 or 70-138. Alternatively, it can be determined with reference to the codon (standard genetic code) corresponding to each amino acid. At that time, the base sequence may be redesigned at codons frequently used for the host microorganism used in the present invention.
- base sequence of the nucleic acid encoding the polypeptide having the amino acid sequence set forth in SEQ ID NOS: 1-16, 70-138 and 213 include the base set forth in SEQ ID NOS: 54-69, 139-207 and 214, respectively. Sequence is mentioned.
- a polypeptide encoded by a certain nucleic acid has 3-oxoadipyl-CoA reductase activity
- transformant strain A and transformant strain B were prepared, and as a result of culture test, culture broth If 3-hydroxyadipic acid or ⁇ -hydromuconic acid can be identified therein, it is determined that the nucleic acid encodes a polypeptide having 3-oxoadipyl-CoA reductase activity.
- the determination method is described using the biosynthetic pathway shown in the following scheme 1.
- reaction A shows a reaction for producing 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA.
- reaction B shows a reaction for producing 3-hydroxyadipyl-CoA from 3-oxoadipyl-CoA.
- reaction C shows a reaction for producing 2,3-dehydroadipyr-CoA from 3-hydroxyadipyl-CoA.
- reaction D shows a reaction for producing adipyl-CoA from 2,3-dehydroadipyl-CoA.
- Reaction E shows a reaction of producing 3-hydroxyadipic acid from 3-hydroxyadipyr-CoA.
- Reaction F shows a reaction of producing ⁇ -hydromuconic acid from 2,3-dehydroadipyl-CoA.
- Reaction G shows a reaction for producing adipic acid from adipyl-CoA.
- Transformed strain A has an enzyme that catalyzes reaction A, reaction E and reaction F.
- Transformed strain B has an enzyme that catalyzes reaction A, reaction C, reaction E and reaction F.
- a transformed strain A is prepared.
- a plasmid expressing an enzyme catalyzing reaction A, reaction E and reaction F, respectively, is prepared.
- the reactions E and F can catalyze the reaction with the same enzyme.
- the plasmid is introduced into a strain of Escherichia coli BL21 (DE3), which is a microbial strain not capable of producing any of 3-hydroxyadipic acid, ⁇ -hydromuconic acid and adipic acid.
- An expression plasmid in which a nucleic acid encoding a polypeptide to be tested for the presence or absence of the enzyme activity is inserted downstream of a suitable promoter is introduced into the obtained transformant, to obtain a transformant A.
- transformant strain A is cultured, and it is confirmed whether or not the culture solution after the culture contains 3-hydroxyadipic acid. If 3-hydroxyadipic acid can be confirmed in the culture solution, then transformant strain B is prepared. Transformed strain B is obtained by preparing and introducing a plasmid expressing an enzyme catalyzing reaction C into transformed strain A. The transformant strain B is cultured, and it is confirmed whether or not the culture solution after the culture contains ⁇ -hydromuconic acid. If it can be confirmed that the culture solution after culture contains ⁇ -hydromuconic acid, 3-hydroxyadipic acid produced by transformant A and ⁇ -hydromuconic acid produced by transformant B are 3-hydroxy adipate. It is determined that the polypeptide of interest has 3-oxoadipyl-CoA reductase activity, as it is known that it was produced via adipyl-CoA.
- pcaF NCBI Gene ID: 1041755, SEQ ID NO: 20
- pcaF NCBI Gene ID: 1041755, SEQ ID NO: 20
- pcaI and pcaJ NCBI Gene ID: 1046613, 1046612, SEQ ID NO: 23, 24
- the polypeptides encoded by pcaI and pcaJ catalyze reactions E and F by forming a complex.
- Pseudomonas putida KT2440 strain gene paaF (NCBI Gene ID: 1046932, SEQ ID NO: 47) is used.
- the culture method of the transformed strain A and the transformed strain B is as follows. At the time of culture, an antibiotic for stably holding a plasmid, and a substance which induces expression of a polypeptide encoded by the incorporated nucleic acid can be appropriately added.
- One transformation platinum A or B was added to 5 mL of culture medium I (Bacto tryptone (Difco Laboratories) 10 g / L, Bacto yeast extract (Difco Laboratories) 5 g / L, sodium chloride 5 g / L) adjusted to pH 7 Inoculate the ear and shake culture at 30 ° C., 120 min-1 for 18 hours to obtain a pre-culture solution.
- the medium II succinic acid 10 g / L, glucose 10 g / L, ammonium sulfate 1 g / L, potassium phosphate 50 mM, magnesium sulfate 0.025 g / L, iron sulfate
- 0.25 mL of the preculture liquid was adjusted to pH 6.5 0.0625 mg / L, manganese sulfate 2.7 mg / L, calcium chloride 0.33 mg / L, sodium chloride 1.25 g / L, Bacto tryptone 2.5 g / L, Bacto yeast extract 1.25 g / L
- the obtained culture broth contains 3-hydroxyadipic acid or ⁇ -hydromuconic acid.
- the presence of 3-hydroxyadipic acid or ⁇ -hydromuconic acid in the culture can be confirmed by centrifuging the culture and analyzing the supernatant by LC-MS / MS.
- the conditions of analysis are as follows.
- LC detector DAD (210 nm) MS / MS: Triple-Quad LC / MS (manufactured by Agilent Technologies) Ionization method: ESI negative mode.
- the value of the activity of 3-oxoadipyl-CoA reductase can be determined by using 3-oxoadipyl-CoA reductase, which is prepared from 3-oxoadipate by enzymatic reaction, using 3-oxoadipyl-CoA as a substrate and 3-hydroxyadipyl- It can be calculated by measuring CoA.
- the specific method is as follows.
- 3-oxoadipic acid can be prepared by known methods (for example, the method described in Reference Example 1 of WO 2017/099209).
- PCR is performed using genomic DNA of Pseudomonas putida strain KT2440 as a template according to a conventional method to amplify the full length of a nucleic acid encoding CoA transferase (pcaI and pcaJ, NCBI-GeneID: 1046613 and 1046612) Do.
- the nucleotide sequences of the primers used in this PCR are, for example, SEQ ID NOs: 25 and 26.
- the amplified fragment is inserted into the KpnI site of pRSF-1b (manufactured by Novagen), an expression vector for E. coli, in the same frame as the histidine tag sequence.
- the plasmid is introduced into E. coli BL21 (DE3), induction of expression of the enzyme by isopropyl-.beta.-thiogalactopyranoside (IPTG) is carried out according to a conventional method, followed by purification using a histidine tag from the culture solution, CoA Obtain a transferase solution.
- the enzyme reaction solution for preparation of 3-oxoadipyl-CoA having the following composition is prepared using the solution, reacted for 3 minutes at 25 ° C., and then UF membrane (Amicon Ultra-0.5 mL 10 K, manufactured by Merck Millipore) is used. The enzyme is removed by treatment, and the resulting permeate is converted to a 3-oxoadipyl-CoA solution.
- Enzyme reaction solution for preparation of 3-oxoadipyl-CoA 100 mM Tris-HCl (pH 8.2) 10 mM MgCl 2 0.5 mM succini-CoA 5mM 3-oxoadipic acid sodium salt 2 ⁇ M CoA transferase.
- PCR is carried out according to a conventional method using genomic DNA of the target microorganism strain as a template to amplify the entire nucleic acid encoding 3-oxoadipyl-CoA reductase.
- the nucleotide sequences of the primers used in this PCR are, for example, SEQ ID NOs: 31 and 32.
- the amplified fragment is inserted into the BamHI site of an expression vector pACYCDuet-1 (manufactured by Novagen) for E. coli in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- the genetically modified microorganism in which the expression of the polypeptide described in (a) to (c) is enhanced is a microorganism originally having a nucleic acid encoding the polypeptide described in (a) to (c).
- the host microorganism is a microorganism having the expression of the polypeptide described in (a) to (c) possessed by the host microorganism enhanced by genetic modification.
- microorganisms originally having a nucleic acid encoding the polypeptide described in (a) to (c) include the following Serratia microorganisms.
- Serratia marcescens a microorganism having SEQ ID NO: 1, 70-80, 82-85, 87-118
- Serratia nematodiphila a microorganism having SEQ ID NO: 2, 81, 119
- Serratia plymuthica SEQ ID NO: 3, 131-136, 138
- Serratia proteamaculans a microorganism having SEQ ID NO: 4, 137
- Serratia urealitica a microorganism having SEQ ID NO: 5
- Serratia sp Serratia sp.
- BW 106 (a microorganism having SEQ ID NO: 6), Serratia sp. S119 (a microorganism having SEQ ID NO: 7), Serratia sp. YD25 (a microorganism having SEQ ID NO: 8), Serratia sp. FS14 (a microorganism having SEQ ID NO: 9), Serratia sp. HMSC15F11 (a microorganism having SEQ ID NO: 10), Serratia sp. JKS 0001 99 (a microorganism having SEQ ID NO: 11), Serratia sp. TEL (a microorganism having SEQ ID NO: 12), Serratia sp.
- ISTD04 (a microorganism having SEQ ID NO: 13), Serratia sp. SCBI (a microorganism having SEQ ID NO: 14), Serratia sp. S4 (a microorganism having SEQ ID NO: 15), Serratia sp. C-1 (a microorganism having SEQ ID NO: 16), Serratia sp. OMLW3 (a microorganism having SEQ ID NO: 86), Serratia sp. OLEL 1 (a microorganism having SEQ ID NO: 120), Serratia sp. OLEL2 (a microorganism having SEQ ID NO: 123), Serratia liquefaciens (a microorganism having SEQ ID NO: 213) and the like.
- polypeptides described in (a), (b) and (c) above also have 3-hydroxybutyryl-CoA dehydrogenase activity, and this 3-hydroxybutyryl-CoA dehydrogenase is a microorganism of the genus Serratia. And a 3-hydroxybutyryl-CoA dehydrogenase gene which constitutes a 5-aminolevulinate synthase gene and a gene cluster.
- the “gene cluster” refers to a series of nucleic acid groups having related functions in close proximity It means the area that exists. Specific components of the gene cluster include, for example, a nucleic acid group transcriptionally regulated by a single transcriptional regulator, an operon transcribed under the control of a single transcriptional promoter, and the like. Whether a certain nucleic acid is a nucleic acid that constitutes a gene cluster can also be examined online using a gene cluster search program such as antiSMASH.
- the gene encoding the amino acid sequence of SEQ ID NO: 4 is registered as Gene ID: CP000826.1 in the NCBI database, and is conserved on the genome of Serratia proteamaculans 568, and Gene ID: CP000826 It can be searched that it is stored in the positions 2015313 to 2016842 of .1. Furthermore, from the positional information of this gene, gene sequences before and after it can be confirmed, and it can also be confirmed that the gene cluster shown in FIG. 1 is formed with the 5-aminolevulinate synthase gene (Protein ID: ABV40933.1).
- the amino acid sequences of 127 to 133, 135 to 137 and 213 can be confirmed on NCBI by the protein ID and gene ID shown in Table 13.
- a “nucleic acid encoding a polypeptide encoded by a 3-hydroxybutyryl-CoA dehydrogenase gene constituting a 5-aminolevulinate synthase gene and a gene cluster in a microorganism of Serratia” is used in the present invention. Described as 3-hydroxybutyryl-CoA dehydrogenase gene, and the polypeptide encoded by the 3-hydroxybutyryl-CoA dehydrogenase gene is described as "3-hydroxybutyryl-CoA dehydrogenase used in the present invention”.
- the gene cluster containing the 3-hydroxybutyryl-CoA dehydrogenase gene used in the present invention includes other nucleic acids in the cluster as long as it contains at least the 3-hydroxybutyryl-CoA dehydrogenase gene and the 5-aminolevulinate synthase gene. It may be done.
- FIG. 1 shows a specific example of a gene cluster including the 3-hydroxybutyryl-CoA dehydrogenase gene used in the present invention.
- Serratia genus microorganism having the gene cluster is S. Marcescens, S. Nematodiphila, S. Plymuthica, S. Proteamaculans, S. Urealitica, S. Liquefaciens, Serratia sp. BW 106, Serratia sp. S119, Serratia sp. YD25, Serratia sp. FS 14, Serratia sp. HMSC15F11, Serratia sp. JKS 0001 99, Serratia sp. TEL, Serratia sp. ISTD04, Serratia sp. SCBI, Serratia sp. S4, Serratia sp. C-1, Serratia sp. OMLW3, Serratia sp. OLEL1, Serratia sp. OLEL2, S. Liquefaciens etc. are mentioned.
- the 3-hydroxybutyryl-CoA dehydrogenase used in the present invention has excellent 3-oxoadipyl-CoA reductase activity. Whether a nucleic acid encoding 3-hydroxybutyryl-CoA dehydrogenase has 3-oxoadipyl-CoA reductase activity can be confirmed in the same manner as described above.
- polypeptide encoded by the 3-hydroxybutyryl-CoA dehydrogenase gene used in the present invention is characterized by having a consensus sequence 1.
- amino acid sequence of such polypeptide include the amino acid sequence of SEQ ID NO: 1-16, 70-138 or 213.
- one or more amino acids may be substituted, deleted, inserted and / or changed in the amino acid sequence of any one of SEQ ID NOs: 7 to 16 or 70 to 138, as long as they have the consensus sequence 1 above.
- a nucleic acid encoding a polypeptide comprising an added amino acid sequence and having an enzyme activity catalyzing a reaction of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA can also be preferably used.
- the range of "one or several" is preferably 10 or less, more preferably 5 or less, particularly preferably 4 or less, and most preferably 1 or 2 or less.
- sequence identity is 70% or more, preferably 80% or more, more preferably 85% or more, still more preferably 90% or more, more preferably with the amino acid sequence of any polypeptide of SEQ ID NO: 7-16 or 70-138.
- the reaction has a sequence identity of preferably 95% or more, more preferably 97% or more, more preferably 99% or more, and catalyzing a reaction of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA
- a nucleic acid encoding a polypeptide having an enzymatic activity can also be preferably used.
- 3-hydroxybutyryl-CoA dehydrogenase used in the present invention
- a polypeptide having the activity of 3-oxoadipyl-CoA reductase for example, PaaH derived from Pseudomonas putida strain KT2440 (SEQ ID NO: 208), Escherichia coli str. K-12 substr.
- polypeptide examples include PaaH (SEQ ID NO: 209) derived from MG1655 strain, DcaH (SEQ ID NO: 210) derived from Acinetobacter baylyi ADP1 strain, PaaH (SEQ ID NO: 211) derived from Serratia plymuthica NBRC 102599 strain, etc. As shown in Table 4 and Table 5, it can be seen that Consensus Sequence 1 is not included.
- these polypeptides consist of an amino acid sequence in which one or several amino acids are substituted, deleted, inserted and / or added in the amino acid sequence of any one of (b) SEQ ID NO: 1-6 and 213, And a polypeptide having an enzyme activity catalyzing a reaction for reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA, or (c) against the amino acid sequence of any one of SEQ ID NOs: 1 to 6 and 213 It does not correspond to a polypeptide having a sequence identity of 70% or more and having an enzyme activity that catalyzes a reaction of reducing 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA.
- the microorganism which can be used as a host for obtaining the genetically modified microorganism in the present invention is Escherichia coli, Serratia, Hafnia, Psuedomonas, Corynebacterium, Bacillus, Streptomyces, Cupriavidus, Acinetobacter, Alcaligenes, Brevibacterium.
- Microorganisms belonging to the genera Delftia, Shimwellia, Aerobacter, Rhizobium, Thermobifida, Clostridium, Schizosaccharomyces, Kluyveromyces, Pichia and Candida are included. Among these, microorganisms belonging to the genus Escherichia, Serratia, Hafnia, and Pseudomonas are preferable.
- a method of producing 3-hydroxyadipic acid, ⁇ -hydromuconic acid and / or adipic acid using the genetically modified microorganism of the present invention is described.
- the genetically modified microorganism of the present invention is capable of producing 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA (reaction A), and produces 3-hydroxyadipic acid from 3-hydroxyadipyl-CoA If it is capable of (reaction E), 3-hydroxyadipic acid can be produced.
- reaction A 3-oxoadipyl-CoA and coenzyme A
- 3-hydroxyadipic acid from 3-hydroxyadipyl-CoA
- reaction E 3-hydroxyadipic acid
- a microorganism having these generation capabilities as a host microorganism
- genetically modified microorganisms capable of highly producing 3-hydroxyadipic acid can be obtained.
- the following microorganisms are mentioned as microorganisms presumed to originally have these production ability.
- Escherichia genus such as Escherichia fergusonii, Escherichia coli, Pseudomonas chlororaphis, Pseudomonas putida, Pseudomonas azotoformans, Pseudomonas chlororaphis subsp.
- Corinobacterium such as P.
- aureofaciens such as Psuedomonas sp., Hafnia alvei, such as Hafnia, such as Corynebacterium acetoacidophilum, Corynebacterium acetoglutamicum, Corynebacterium ammoniagenes, such as Corynebacterium glutamicum, such as Bacillus subtilis C, such as Stre Cupellavidium, for example, to the genus Tomyces, Cupriavidus metallidurans, Cupriavidus necator, Cupriavidus, such as Cupriavidus, such as Acinetobacter baylyi, Acinetobacter, such as Acinetobacter radioresistens, such as the genus Alcaligenes, such as the genus Alcaligenes Shimwell such as Delftia spp., Shimwellia blattae a genus, Aerobacter genus such as Aerobacter cloacae, Rhizobium species such as Rhizob
- reaction A 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA
- reaction E 3-hydroxyadipate from 3-hydroxyadipyl-CoA
- the ability to generate these reactions is imparted by introducing into the microorganism a nucleic acid encoding an enzyme catalyzing reactions A and E appropriately combined and introduced into a microorganism. be able to.
- a microorganism having these generation capabilities as a host microorganism, a genetically modified microorganism capable of highly producing ⁇ -hydromuconic acid can be obtained.
- Escherichia genus such as Escherichia fergusonii, Escherichia coli, Pseudomonas fluorescens, Pseudomonas putida, Pseudomonas azotoformans, Pseudomonas chlororaphis subsp.
- Aureofaciens such as Psuedomonas, Hafnia alvei, such as Hafnia, Bacillus badius, such as Bacillus, Cupriavidus metallidurans, Cupriavidus numazuensis, such as Cupriavidus, such as Cupriavidus, Acinetobacter baylyceli, Delftia genus such as Delftia acidovorans, Shimwellia such as Shimwellia blattae , Serratia grimesii, Serratia ficaria, Serratia fonticola, Serratia odorifera, Serratia plymuthica, Serratia spp., Such as Serratia entomophila or Serratia nematodiphila.
- the ability of the genetically modified microorganism of the present invention to produce 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA (reaction A), dehydrating 3-hydroxyadipyl-CoA to give 2,3-dehydroazid Reactions A and C, if not originally possessing the ability to form pill-CoA (Reaction C) and 2,3-dehydroadipyl-CoA to generate ⁇ -hydromuconic acid (Reaction F).
- the ability to generate these can be imparted by introducing into a microorganism a nucleic acid encoding an enzyme catalyzing F, in an appropriate combination.
- the ability of the genetically modified microorganism of the present invention to produce 3-oxoadipyl-CoA and coenzyme A from succinyl-CoA (reaction A), dehydrating 3-hydroxyadipyl-CoA to give 2,3-dehydroadipyl-CoA
- the ability to generate (reaction C), the ability to reduce 2,3-dehydroadipyl-CoA to form adipyl-CoA (reaction D), and the ability to form adipic acid from adipyl-CoA (reaction G) If it has, adipic acid can be produced.
- microorganism having these producing ability as a host microorganism, a genetically modified microorganism capable of highly producing adipin can be obtained.
- Microorganisms which are presumed to inherently have the ability to produce these include Thermobifida genera such as Thermobifida fusca.
- the ability of the genetically modified microorganism of the present invention to produce 3-oxoadipyl-CoA and coenzyme A from succinyl-CoA (reaction A), dehydrating 3-hydroxyadipyl-CoA to give 2,3-dehydroadipyl-CoA
- the ability to generate (reaction C), the ability to reduce 2,3-dehydroadipyl-CoA to form adipyl-CoA (reaction D), and the ability to form adipic acid from adipyl-CoA (reaction G)
- the ability to generate these can be imparted by introducing into a microorganism a nucleic acid encoding an enzyme that catalyzes reactions A, C, D, and G appropriately combined and introduced into a microorganism.
- acyltransferase As an enzyme catalyzing reaction A for producing 3-oxoadipyl-CoA, for example, acyltransferase ( ⁇ -ketothiolase) can be used.
- the acyltransferase is not particularly limited in classification by EC number, but EC 2.3.1. Acyltransferases classified into-are preferred, and specifically, enzymes classified into EC 2.3. 1.174 as 3-oxoadipyl-CoA thiolase, EC 2.3. 1.9 as acetyl-CoA C-acetyltransferase
- Enzymes classified, enzymes classified as EC2.3.1.16 as acetyl-CoA C-acyltransferase can be mentioned.
- PaaJ NCBI-Protein ID: NP_415915
- PcaF NCBI-Protein ID: NP_743536
- Pseudomonas putida KT 2440 strain and the like can be preferably used.
- acyltransferase can generate 3-oxoadipyl-CoA using succinyl-CoA and acetyl-CoA as a substrate depends on the reaction of 3-oxoadipyl-CoA with purified acyltransferase and 3-oxoadipyl-CoA as a substrate
- the reduction reaction by the purified 3-oxoadipyl-CoA reductase can be combined and the reduction can be confirmed by measuring the amount of reduction of NADH accompanying the reduction of 3-oxoadipyl-CoA.
- the specific measurement method is, for example, as follows.
- PCR is carried out according to a conventional method using genomic DNA of the target microorganism strain as a template to amplify a full-length nucleic acid encoding acyltransferase.
- the amplified fragment is inserted into the SacI site of an expression vector pACYCDuet-1 (manufactured by Novagen) for E. coli in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- coli BL21 (DE3), induction of expression of the enzyme by isopropyl- ⁇ -thiogalactopyranoside (IPTG) is carried out according to a conventional method, followed by purification using a histidine tag from a culture solution, Obtain a transferase solution.
- the acyltransferase activity can be confirmed by preparing an enzyme reaction solution of the following composition using the enzyme solution and measuring the decrease in absorption at 340 nm associated with the oxidation of NADH at 30 ° C.
- Whether or not the enzyme originally expressed in the host microorganism used in the present invention has an acyltransferase activity can be determined by performing the above-mentioned measurement using cell free extract (CFE) instead of the purified acyltransferase. It can confirm.
- CFE cell free extract
- the specific measuring method for E. coli is, for example, as follows.
- E. coli MG1655 strain to be subjected to activity measurement was inoculated in 5 mL of culture medium adjusted to pH 7 (media composition: 10 g / L of tryptone, 5 g / L of yeast extract, 5 g / L of sodium chloride) Incubate with shaking for 18 hours.
- the obtained culture solution was adjusted to pH 7 (medium composition: 10 g / L of tryptone, 5 g / L of yeast extract, 5 g / L of sodium chloride, 2.5 mM of ferulic acid, 2.5 mM of p-coumaric acid, benzoic acid 2.
- a UF membrane (Amicon Ultra-0.5 mL 10 K, manufactured by Merck Millipore), the permeate is removed, and then 0.4 mL of Tris-HCl buffer is used. After removing low molecular weight contaminants by repeating the addition three times, resuspend with Tris-HCl buffer to make the volume 0.1 mL, which is called CFE. In place of the purified enzyme, 0.05 mL of the CFE is added to a total of 0.1 mL of the enzyme reaction solution to confirm the enzyme activity.
- enoyl-CoA hydratase As an enzyme catalyzing the reaction C for producing 2,3-dehydroadipyl-CoA, for example, enoyl-CoA hydratase can be used.
- the enoyl-CoA hydratase is not particularly limited in classification by EC number, but EC number 4.2.1. Enoyl-CoA hydratase classified into-is preferred, and specific examples thereof include enzymes classified into EC 4.2.1.17 as enoyl-CoA hydratase or 2,3-dehydroadipyl-CoA hydratase.
- PaaF (NCBI-ProteinID: NP_415911) derived from Escherichia coli MG1655 strain
- PaaF (NCBI-ProteinID: NP_745427) derived from Pseudomonas putida KT 2440 strain, and the like can be preferably used.
- enoyl-CoA hydratase catalyzes a reaction in which 2,3-dehydroadipyl-CoA is generated using 3-hydroxyadipyl-CoA as a substrate
- the activity is detected by detecting 3-hydroxyadipyl-CoA generated using purified enoyl-CoA hydratase using 2,3-dehydroadipyl-CoA prepared by enzyme reaction from ⁇ -hydromuconic acid as a substrate It can confirm by that.
- the specific measurement method is, for example, as follows.
- the ⁇ -hydromuconic acid used here can be prepared by a known method (for example, the method described in Reference Example 1 of WO 2016/199858 A1).
- PCR is performed using the genomic DNA of Pseudomonas putida strain KT2440 as a template according to a conventional method, and the nucleic acid encoding CoA transferase (pcaI and pcaJ, NCBI-GeneID: 1046613 and 1046612) Amplify the full length of The amplified fragment is inserted into the KpnI site of pRSF-1b (manufactured by Novagen), an expression vector for E. coli, in the same frame as the histidine tag sequence. The plasmid is introduced into E.
- Enzyme reaction solution for preparing 2,3-dehydroadipyl-CoA 100 mM Tris-HCl (pH 8.0) 10 mM MgCl 2 0.4 mM succini-CoA 2 mM ⁇ -hydromuconic acid sodium salt 20 ⁇ g / mL CoA transferase.
- PCR is carried out according to a conventional method using genomic DNA of the target microorganism strain as a template to amplify a full-length nucleic acid encoding enoyl-CoA hydratase.
- the amplified fragment is inserted into the NdeI site of an expression vector pET-16b (manufactured by Novagen) for E. coli in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- coli BL21 (DE3), induction of expression of the enzyme by isopropyl-.beta.-thiogalactopyranoside (IPTG) is carried out according to a conventional method, followed by purification from a culture solution using a histidine tag, and enoyl -Obtain a CoA hydratase solution.
- the enoyl-CoA hydratase activity is prepared by preparing an enzyme reaction solution of the following composition using the solution, reacting at 30 ° C.
- Whether the enzyme originally expressed in the host microorganism used in the present invention has enoyl-CoA hydratase activity can be determined by using 0.05 mL of a total of 0.1 mL of CFE instead of purified enoyl-CoA hydratase. It can confirm by adding and performing the above-mentioned measurement.
- a specific example of the method for preparing CFE for E. coli is as described in the method for confirming acyltransferase activity.
- enoyl-CoA reductase As an enzyme catalyzing the reaction D for producing adipyl-CoA, for example, enoyl-CoA reductase can be used.
- the enoyl-CoA reductase is not particularly limited in classification by EC number, but EC number 1.3. -.
- Enzymes classified into Specific examples thereof are described in, for example, JP-A-2011-515111, J Appl Microbiol. 2015 Oct; 119 (4): 1057-63.
- Etc. among which TER (UniProtKB: Q5EU90) derived from Euglena gracilis Z strain, Tfu_1647 (NCBI-ProteinID: AAZ55682) derived from Thermobifida fusca YX strain, DcaA (NCBI-ProteinID: AAL09094) derived from Acinetobacter baylyi ADP1 strain. .1) can be preferably used.
- enoyl-CoA reductase has 2,3-dehydroadipyl-CoA as a substrate
- the activity to form adipyl-CoA is 2,3-dehydroadipyl prepared by enzymatic reaction from ⁇ -hydromuconic acid It can be confirmed by measuring the amount of reduction of NADH accompanying the reduction of 2,3-dehydroadipyl-CoA using purified enoyl-CoA reductase, using -CoA as a substrate.
- PCR is performed according to a conventional method using genomic DNA of a target microorganism strain as a template to amplify a full-length nucleic acid encoding enoyl-CoA reductase.
- the amplified fragment is inserted into the NdeI site of an expression vector pET-16b (manufactured by Novagen) for E. coli in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- reaction E for producing 3-hydroxyadipic acid As the enzyme catalyzing reaction E for producing 3-hydroxyadipic acid, reaction F for producing ⁇ -hydromuconic acid, and reaction G for producing adipic acid, for example, CoA transferase or acyl-CoA hydrolase can be used. , CoA transferase is preferred.
- the CoA transferase is not particularly limited in classification by EC number, but EC number 2.8.3. CoA transferase classified into-is preferable, and specifically, CoA transferase or an enzyme classified into EC 2.8.3.6 as acyl-CoA transferase and the like can be mentioned.
- CoA transferase refers to an enzyme having a catalytic activity (CoA transferase activity) of a reaction for producing carboxylic acid and succinyl-CoA using acyl-CoA and succinic acid as a substrate.
- PcaI and PcaJ (NCBI-Protein ID: NP — 746081 and NP — 746082) derived from Pseudomonas putida KT 2440 are preferably used as the enzyme catalyzing the reaction E for producing 3-hydroxyadipic acid and the reaction F for producing ⁇ -hydromuconic acid. be able to.
- DcaI and DcaJ (NCBI-Protein ID: CAG68538 and CAG68539) derived from Acinetobacter baylyi ADP1 strain can preferably be used as an enzyme catalyzing the reaction G for producing adipic acid.
- the activity of CoA transferase using 3-hydroxyadipyl-CoA, 2,3-dehydroadipyl-CoA or adipyl-CoA as a substrate is 3-hydroxyadipate and succinyl-CoA because this enzyme reaction is a reversible reaction.
- 3-hydroxyadipyl-CoA, 2,3-dehydroadipyl-CoA or adipyl-CoA produced using purified CoA transferase with ⁇ -hydromuconic acid and succinyl-CoA, or adipic acid and succinyl-CoA as a substrate Can be confirmed by detecting
- the specific measurement method is, for example, as follows.
- 3-hydroxy adipic acid is prepared according to the method described in Reference Example 1 of WO 2016/199856 A1.
- PCR is performed using genomic DNA of the target microorganism strain as a template according to a conventional method to amplify the entire nucleic acid encoding CoA transferase.
- the amplified fragment is inserted into the KpnI site of pRSF-1b (manufactured by Novagen), an expression vector for E. coli, in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- ⁇ -hydromuconic acid is prepared by the method described in Reference Example 1 of WO2016 / 199858A1.
- PCR is performed using genomic DNA of the target microorganism strain as a template according to a conventional method to amplify the entire nucleic acid encoding CoA transferase.
- the amplified fragment is inserted into the KpnI site of pRSF-1b (manufactured by Novagen), an expression vector for E. coli, in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- PCR is performed using genomic DNA of the target microorganism strain as a template according to a conventional method to amplify a full-length nucleic acid encoding CoA transferase.
- the amplified fragment is inserted into the KpnI site of pRSF-1b (manufactured by Novagen), an expression vector for E. coli, in the same frame as the histidine tag sequence.
- the plasmid is introduced into E.
- Whether the enzyme originally expressed in the host microorganism used in the present invention has CoA transferase activity can be determined by adding 0.05 mL of CFE to a total of 0.1 mL of the enzyme reaction solution instead of purified CoA transferase. This can be confirmed by measuring the A specific example of the method for preparing CFE for E. coli is as described in the method for confirming acyltransferase activity.
- polypeptides described in (a) to (c) or 3-hydroxybutyryl-CoA dehydrogenase are characterized by having superior activity to 3-oxoadipyl-CoA reductase used in the prior art. I assume.
- “superior activity” means culture in a medium containing a carbon source as a fermentation raw material, which is the same host microorganism, a genetically modified microorganism which expresses the polypeptide or conventional 3-oxoadipyl-CoA reductase under expression conditions
- it means producing 3-hydroxyadipic acid, ⁇ -hydromuconic acid, or adipic acid in high yield as compared to a genetically modified microorganism expressing conventional 3-oxoadipyl-CoA reductase.
- the 3-hydroxyadipic acid yield is calculated according to the formula (3).
- the ⁇ -hydromuconic acid yield or adipic acid yield is calculated by replacing 3-hydroxyadipic acid of the formula (3) with ⁇ -hydromuconic acid or adipic acid, respectively.
- Yield (%) 3-hydroxy adipic acid production amount (mol) / consumption of carbon source (mol) x 100 ... Formula (3).
- the polypeptide described in (a) to (c) or 3-hydroxybutyryl-CoA dehydrogenase has an activity superior to that of 3-oxoadipyl-CoA reductase used in the prior art.
- the specific method to do this is as follows.
- the vector pBBR1MCS-2 (ME Kovach, (1995), Gene 166: 175-176) capable of autonomous replication in E. coli is cleaved with XhoI to obtain pBBR1MCS-2 / XhoI.
- PCR amplification of upstream region 200b of gapA is performed according to a conventional method using genomic DNA of Escherichia coli K-12 MG1655 as a template (the primer used is For example, the obtained fragment and pBBR1MCS-2 / XhoI are ligated using In-Fusion HD Cloning Kit (Clontech) to obtain plasmid pBBR1MCS-2 :: Pgap, for example.
- pBBR1MCS-2 :: Pgap is cut with ScaI to obtain pBBR1MCS-2 :: Pgap / ScaI.
- the full-length nucleic acid encoding acyltransferase is PCR-amplified according to a conventional method (the primers used are, for example, SEQ ID NOs: 21 and 22), and the obtained fragment and pBBR1MCS-2 :: Pgap / ScaI, In-Fusion HD Cloning Kit Ligated using to give the plasmid pBBR1MCS-2 :: AT.
- Cleavage pBBR1 MCS-2 :: AT with HpaI to obtain pBBR1 MCS-2 :: AT / HpaI.
- the full length nucleic acid encoding CoA transferase is PCR amplified according to a conventional method (the primers used are, for example, SEQ ID NOs: 25 and 26), and the obtained fragment and pBBR1MCS-2 :: AT / HpaI, In-Fusion HD Cloning Kit
- the plasmid is ligated with pBBR1MCS-2 :: ATCT.
- an expression vector pACYCDuet-1 capable of autonomous replication in E. coli is cleaved with BamHI to obtain pACYCDuet-1 / BamHI.
- the nucleic acid encoding the polypeptide of SEQ ID NO: 1-16 or 70-138 or 3-oxoadipyl-CoA reductase used in the prior art is PCR-amplified according to a conventional method (for example, the primers used are SEQ ID NO: 31 and 32) ), The obtained fragment and pACYCDuet-1 / BamHI are ligated using In-Fusion HD Cloning Kit (Clontech), and the polypeptide of SEQ ID NO: 1-16 or 70-138 or used in the prior art A plasmid is obtained which expresses the 3-oxoadipyl-CoA reductase.
- the obtained plasmid and pBBR1 MCS-2 are introduced into E. coli strain BL21 (DE3) by electroporation (NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801).
- the supernatant obtained by centrifuging the cells from the culture solution is subjected to membrane treatment using Millex-GV (0.22 ⁇ m, PVDF, manufactured by Merck), and the permeate is analyzed to analyze 3-hydroxyadipine in the culture supernatant. Determine the concentration of acid and carbon source. Quantitative analysis of 3-hydroxyadipic acid by LC-MS / MS is performed under the following conditions.
- LC detector DAD (210 nm) MS / MS: Triple-Quad LC / MS (manufactured by Agilent Technoogies) Ionization method: ESI negative mode.
- HPLC Shimazu Prominence (manufactured by Shimadzu Corporation)
- nucleic acid when a nucleic acid encoding any of acyltransferase, CoA transferase, enoyl-CoA hydratase or enoyl-CoA reductase is introduced into a host microorganism, the nucleic acid is artificially prepared based on the amino acid sequence of the enzyme present in the database. And may be separated from nature. In the case of artificial synthesis, the frequency of use of codons corresponding to each amino acid may be changed according to the host microorganism to be introduced.
- the method for introducing a nucleic acid encoding any of acyltransferase, CoA transferase, enoyl-CoA hydratase or enoyl-CoA reductase into a host microorganism is not particularly limited, and an expression vector capable of autonomous replication in the host microorganism can be used.
- a method of incorporating the nucleic acid into a host microorganism, a method of incorporating the nucleic acid into the genome of the host microorganism, and the like can be used.
- the organism serving as a gene source is not particularly limited.
- Acinetobacter such as Acinetobacter baylyi, Acinetobacter radioresists, Aerobacter such as Aerobacter cloacae, Alcaligenes such as Alcaligenes faecalis, Bacillus genera such as Bacillus badius, Bacillus magertium, Bacillus roseus, Brevibacterium genus such as Brevibacterium iodoinum, Corynebacterium acetoacidophilum, Corynebact Coribacillus such as rium acetoglutamicum, Corynebacterium ammoniagenes, Corynebacterium glutamicum, and the like, and the Cupriavidus, such as Cupriavidus, such as Cupriavi s ich, such as Cui Hafnia, Microbacterium a Microbacterium genus such as moniaphilum, Nocardioides genus
- Rhodospor such as toruloides such as the genus of the genus of Serratia, such as Sailtia, such as Sailtia, such as Sailtia, such as S. Strept, such as Streptomyces vinaceus
- the genus Myces includes genus Yarrowia such as Yarrowia lipolytica, the genus Yersinia such as Yersinia ruckeri, the genus Euglena such as Euglena gracilis, and the genus Thermobifida such as Thermobifida fusca , Euglena, Thermobifida.
- the expression vector or nucleic acid for integration into a genome is a promoter, a ribosome binding sequence, a nucleic acid encoding a polypeptide to be expressed, a transcription termination sequence It is preferable that it is comprised. In addition, a gene that controls promoter activity may be included.
- the promoter used in the present invention is not particularly limited as long as it is capable of expressing an enzyme in a host microorganism, and examples include a gap promoter, trp promoter, lac promoter, tac promoter, T7 promoter and the like.
- a nucleic acid or enhancing expression of a polypeptide using an expression vector it is not particularly limited as long as it can be autonomously replicated in the microorganism, for example, pBBR1MCS vector, pBR322 vector, pMW vector, pET Vectors, pRSF vectors, pCDF vectors, pACYC vectors, and derivatives of the above-mentioned vectors, and the like can be mentioned.
- the introduction is performed using site-specific homologous recombination.
- site homologous recombination is not particularly limited, for example, a method using ⁇ Red recombinase and FLP recombinase (Proc Natl Acad Sci USA 2000. Jun 6; 97 (12): 6640-6645.), ⁇ Red recombinase and Methods using the sacB gene (Biosci Biotechnol Biochem. 2007 Dec; 71 (12): 2905-11) can be mentioned.
- the method for introducing the expression vector or nucleic acid for integration into a genome is not particularly limited as long as it is a method for introducing a nucleic acid into a microorganism, for example, calcium ion method (Journal of Molecular Biology, 53, 159 (1970)), electroporation method NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801) and the like.
- a medium containing a carbon source that can be used by ordinary microorganisms, as a fermentation source is preferably a genetically modified microorganism into which a nucleic acid encoding 3-oxoadipyl-CoA reductase has been introduced or whose expression of the polypeptide has been enhanced.
- Culture in liquid medium in addition to the carbon source that can be used by the genetically modified microorganism, a medium containing a nitrogen source, an inorganic salt, and, if necessary, an organic trace nutrient such as an amino acid or a vitamin, is suitably used. Any of a natural medium and a synthetic medium can be used as long as the nutrient source is contained.
- the fermentation raw material is a raw material that can be metabolized by the genetically modified microorganism.
- “Metabolism” refers to the conversion of one chemical substance, which is taken from the outside of a cell by a microbe from the outside of a cell or generated from another chemical substance in the cell, into another chemical substance by enzymatic reaction.
- saccharides can be preferably used as a carbon source. Specific examples of saccharides include monosaccharides such as glucose, sucrose, fructose, galactose, mannose, xylose and arabinose, disaccharides to which these monosaccharides are bound, polysaccharides, starch saccharification solutions containing these, molasses, cellulose The biomass saccharified liquid etc. are mentioned.
- 3-hydroxyadipic acid, ⁇ -hydromuconic acid and / or adipic acid can be efficiently produced by adding succinic acid which is a substrate of CoA transferase.
- the carbon sources listed above may be used alone or in combination.
- the concentration of the carbon source in the culture medium is not particularly limited, and can be appropriately set according to the type of the carbon source etc.
- 5 g / L to 300 g / L of saccharides, succinic acid Is 0.1 g / L to 100 g / L.
- nitrogen sources used for culturing the genetically modified microorganism include ammonia gas, ammonia water, ammonium salts, urea, nitrates, and other organic nitrogen sources that are additionally used, such as oil syrup, soybean hydrolysate, Casein decomposition products, other amino acids, vitamins, corn steep liquor, yeast or yeast extract, meat extract, peptides such as peptone, various fermented cells and hydrolysates thereof can be used.
- the concentration of the nitrogen source in the culture medium is not particularly limited, but preferably 0.1 g / L to 50 g / L.
- inorganic salts used for culturing the genetically modified microorganism for example, phosphate, magnesium salt, calcium salt, iron salt, manganese salt and the like can be appropriately added and used.
- the culture conditions of the genetically modified microorganism for producing 3-hydroxyadipic acid, ⁇ -hydromuconic acid and / or adipic acid include the culture medium of the above-mentioned component composition, culture temperature, agitation speed, pH, aeration amount, inoculum size, etc. Depending on the type of the genetically modified microorganism and the external conditions, etc., it is appropriately adjusted or selected and set. When foaming occurs in liquid culture, antifoaming agents such as mineral oil, silicone oil and surfactants can be appropriately blended in the medium.
- the produced products can be recovered.
- Recovery, for example, isolation, of the produced product can be carried out according to a general method of stopping the culture when the accumulation amount is moderately increased and collecting the fermented product from the culture. .
- the product is isolated from the culture by column chromatography, ion exchange chromatography, activated carbon treatment, crystallization, membrane separation, distillation and the like. be able to.
- the acid component is added to the salt of the product to recover the precipitate, and the culture is concentrated by using a reverse osmosis membrane, an evaporator, etc.
- the crystals of the product and / or the salt of the product are precipitated by cooling crystallization or adiabatic crystallization, and the crystals of the product and / or the salt of the product are separated by centrifugation or filtration.
- the method of obtaining the product by hydrolysis after recovering the ester of the product by distillation after adding an alcohol to the culture to convert the product to an ester, and the like It is not limited.
- these recovery methods can be appropriately selected and optimized depending on the physical properties of the product and the like.
- Reference Example 1 An enzyme catalyzing a reaction for producing 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA (reaction A), and a reaction for producing 3-hydroxyadipic acid from 3-hydroxyadipyl-CoA (reaction E) Preparation of a plasmid expressing an enzyme catalyzing a reaction (reaction F) for producing ⁇ -hydromuconic acid from 2,3-dehydroadipyl-CoA
- reaction F Preparation of a plasmid expressing an enzyme catalyzing a reaction (reaction F) for producing ⁇ -hydromuconic acid from 2,3-dehydroadipyl-CoA
- the vector pBBR1MCS-2 autonomously replicable in E.
- coli (ME Kovach, (1995), Gene 166: 175-176) was cleaved with XhoI to obtain pBBR1MCS-2 / XhoI.
- the obtained fragment and pBBR1MCS-2 / XhoI were ligated using In-Fusion HD Cloning Kit (manufactured by Clontech), and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant E. coli strain, and the plasmid whose base sequence was confirmed by a conventional method was named pBBR1MCS-2 :: Pgap.
- pBBR1MCS-2 :: Pgap was digested with ScaI to obtain pBBR1MCS-2 :: Pgap / ScaI.
- a primer for PCR amplification of the full length of acyltransferase gene pcaF NCBI Gene ID: 1041755, SEQ ID NO: 20
- genomic DNA of Pseudomonas putida strain KT2440 as a template Were designed SEQ ID NOs: 21 and 22
- PCR was performed according to a conventional method.
- the obtained fragment and pBBR1MCS-2 :: Pgap / ScaI were ligated using In-Fusion HD Cloning Kit and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant strain, and the plasmid whose base sequence was confirmed by a conventional method was named pBBR1MCS-2 :: AT. Subsequently, pBBR1MCS-2 :: AT was cleaved with HpaI to obtain pBBR1MCS-2 :: AT / HpaI.
- Coa transferase genes PcaI and PcaJ NCBI Gene ID: 1046613, 1046612, SEQ ID NOs: 23, 24
- Genomic DNA of Pseudomonas putida strain KT2440 as a template to amplify a gene encoding an enzyme catalyzing Reaction E and Reaction F.
- the primers for PCR amplification of the continuous sequence containing the full length of (SEQ ID NOs: 25 and 26) were designed, and the PCR reaction was carried out according to a conventional method.
- the obtained fragment and pBBR1MCS-2 :: AT / HpaI were ligated using In-Fusion HD Cloning Kit and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant strain, and the plasmid whose base sequence was confirmed by a conventional method was named pBBR1MCS-2 :: ATCT.
- Reference Example 2 Preparation of a plasmid for expressing the polypeptide set forth in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213
- the expression vector pACYCDuet-1 (Novagen) capable of autonomous replication in E. coli is digested with BamHI , PACYCDuet-1 / BamHI.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 54 was designed using genomic DNA of Serratia marcescens ATCC 13880 as a template (SEQ ID NOs: 31, 32) The PCR reaction was performed according to a conventional method.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 55 was designed using genomic DNA of Serratia nematodiphila strain DSM 21420 as a template (SEQ ID NO: 33, 34) The PCR reaction was performed according to a conventional method.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 56 was designed using the genomic DNA of Serratia plymuthica NBRC 102599 strain as a template (SEQ ID NO: 35, 36) The PCR reaction was performed according to a conventional method.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 57 was designed using genomic DNA of Serratia proteamaculans 568 strain as a template (SEQ ID NO: 37, 38) The PCR reaction was performed according to a conventional method.
- a primer for amplifying a nucleic acid described in SEQ ID NO: 58 was designed using genomic DNA of Serratia urealytica Lr5 / 4 as a template (SEQ ID NO: 215, 216) The PCR reaction was performed according to a conventional method.
- Serratia sp In order to amplify a nucleic acid encoding the polypeptide of SEQ ID NO: 6, Serratia sp.
- Primers for amplifying the nucleic acid set forth in SEQ ID NO: 59 were designed using the genomic DNA of strain BW106 as a template (SEQ ID NOs: 217 and 218), and PCR was performed according to a conventional method.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 214 was designed using genomic DNA of Serratia liquefaciens FK01 as a template (SEQ ID NO: 219, 220)
- the PCR reaction was performed according to a conventional method.
- the resulting fragments and pACYCDuet-1 / BamHI were ligated using In-Fusion HD Cloning Kit (Clontech) and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant strain, and the nucleotide sequence was confirmed by a conventional method.
- the expression of 3-oxoadipyl-CoA reductase incorporated into the plasmid is induced with IPTG, and 14 amino acids including a histidine tag are added at the N-terminus.
- a plasmid for expressing the polypeptide of SEQ ID NO: 1 is “pACYCDuet-1 :: Smr1”
- a plasmid for expressing the polypeptide of SEQ ID NO: 2 is “pACYCDuet-1 :: Snm1”
- the plasmid for expressing the polypeptide described in 3 is “pACYCDuet-1 :: Spl1”
- the plasmid for expressing the polypeptide described in SEQ ID NO: 4 is “pACYCDuet-1 :: Spe1”, in SEQ ID NO: 5
- the plasmid for expressing the described polypeptide is “pACYCDuet-1 :: Sur1”
- the plasmid for expressing the polypeptide described in SEQ ID NO: 6 is “pACYCDuet-1 :: Ssp1”, described in SEQ ID NO: 213
- paaH SEQ ID NO: 28
- dcaH SEQ ID NO: 29
- paaH SEQ ID NO: 30
- a plasmid for expressing a polypeptide encoded by the nucleic acid set forth in SEQ ID NO: 27 is “pACYCDuet-1 :: Ppu1”
- a plasmid for expressing a polypeptide encoded by the nucleic acid set forth in SEQ ID NO: 28 is “pACYCDuet- 1: To express a polypeptide encoded by the nucleic acid described in "pACYCDuet-1 :: Aci1”
- a plasmid for expressing a polypeptide encoded by the nucleic acid represented by SEQ ID NO: 29 The plasmid of (pACYCDuet-1 :: Spl2) is shown in Table 6 for these plasmids.
- Example 1 Preparation of 3-hydroxyadipic acid-producing Escherichia coli into which a nucleic acid encoding the polypeptide of SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 was introduced
- the plasmid pBBR1MCS-2 prepared in Reference Example 1 :: ATCT was introduced into E. coli strain BL21 (DE3) by electroporation (NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801).
- the introduced strain was cultured at 37 ° C. on LB agar medium containing 25 ⁇ g / mL kanamycin.
- the obtained recombinant strain was designated BL21 (DE3) / pBBR1MCS-2 :: ATCT.
- the seven types of plasmids prepared in Reference Example 2 were introduced into BL21 (DE3) / pBBR1MCS-2 :: ATCT by electroporation, respectively.
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin and 15 ⁇ g / mL chloramphenicol.
- the recombinant strain into which “pACYCDuet-1 :: Smr1” has been introduced is “Ec / Smr1_3HA”
- the recombinant strain into which “pACYCDuet-1 :: Snm1” has been introduced is “Ec / Snm1_3HA”
- the recombinant strain into which Ec / Sur1_3HA and pACYCDuet-1 :: Ssp1 have been introduced is referred to as "Ec / Ssp1_3HA” and the recombinant strain into which
- Comparative Example 1 Preparation of E. coli capable of producing 3-hydroxyadipic acid into which a nucleic acid encoding 3-oxoadipyl-CoA reductase has been introduced
- the plasmid pBBR1MCS-2 was electroporated into E. coli strain BL21 (DE3). (NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801).
- the introduced strain was cultured at 37 ° C. on LB agar medium containing 25 ⁇ g / mL kanamycin.
- the obtained recombinant strain was designated BL21 (DE3) / pBBR1MCS-2 :: ATCT.
- the four types of plasmids prepared in Reference Example 3 were introduced into BL21 (DE3) / pBBR1MCS-2 :: ATCT by electroporation, respectively.
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin and 15 ⁇ g / mL chloramphenicol.
- the recombinant strain into which “pACYCDuet-1 :: Ppu1” has been introduced is “Ec / Ppu1_3HA”
- the recombinant strain into which “pACYCDuet-1 :: Eco1” has been introduced is “Ec / Eco1_3HA”
- the recombinant strain into which “Ec / Aci1_3HA” and “pACYCDuet-1 :: Spl2” have been introduced is referred to as “Ec / Spl2_3HA”
- the recombinant strains obtained in this comparative example are shown in Table 7 .
- Example 2 Production test of 3-hydroxyadipic acid using E. coli capable of producing 3-hydroxyadipic acid into which a nucleic acid encoding the polypeptide set forth in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 has been introduced
- the recombinant E. coli strain prepared in Example 1 was used to test production of 3-hydroxyadipic acid.
- Comparative example 2 Production test of 3-hydroxyadipate using E. coli capable of producing 3-hydroxyadipate into which a nucleic acid encoding 3-oxoadipyl-CoA reductase has been introduced Production of Comparative Example 1 in the same manner as in Example 2 Table 7 shows the results of a production test of 3-hydroxyadipic acid using the resulting E. coli.
- Example 2 From the results in Table 7, it was revealed that the recombinant strain used in Example 2 has an improved yield of 3-hydroxyadipic acid than the recombinant strain used in Comparative Example 2. That is, it was found that by introducing a nucleic acid encoding the polypeptide described in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 into a microorganism, the productivity of 3-hydroxyadipic acid is significantly improved. .
- PCR amplification of the full length of the enoyl-CoA hydratase gene paaF (NCBI Gene ID: 1046932, SEQ ID NO: 47) using genomic DNA of Pseudomonas putida strain KT2440 as a template
- the following primers were designed (SEQ ID NOS: 48, 49), and PCR was performed according to a conventional method.
- the obtained fragment and pCDF-1b / KpnI were ligated using In-Fusion HD Cloning Kit (Clontech), and introduced into E. coli strain DH5 ⁇ .
- the said plasmid was extracted from the obtained recombinant strain, and the base sequence was confirmed by a conventional method.
- the expression of enoyl-CoA hydratase incorporated into the plasmid is induced by IPTG, and 11 amino acids including a histidine tag are added to the N-terminal.
- the obtained plasmid was called "pCDF-1b :: EHa”.
- Example 3 Preparation of ⁇ -hydromuconic acid-producing Escherichia coli into which a nucleic acid encoding the polypeptide set forth in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 was introduced
- Plasmid pCDF-1b prepared in Reference Example 4 EHa was electroporated into E. coli strain BL21 (DE3) / pBBR1 MCS-2 :: ATCT prepared in Example 1.
- the introduced strain was cultured at 37 ° C. on LB agar medium containing 25 ⁇ g / mL kanamycin and 50 ⁇ g / mL streptomycin.
- the obtained recombinant strain was designated BL21 (DE3) / pBBR1 MCS-2 :: ATCT / pCDF-1b :: EHa.
- the plasmids “pACYCDuet-1 :: Ppu1”, “pACYCDuet-1 :: Eco1”, “pACYCDuet-1 :: Aci1”, and “pACYCDuet-1 :: Spl2” prepared in Reference Example 3 were respectively BL21 ( DE3) / pBBR1MCS-2 :: ATCT / pCDF-1b :: EHa was introduced by electroporation. The introduced strain was cultured at 37 ° C. on LB agar medium containing 25 ⁇ g / mL kanamycin, 50 ⁇ g / mL streptomycin and 15 ⁇ g / mL chloramphenicol.
- the recombinant strain into which "pACYCDuet-1 :: Ppu1” has been introduced is “Ec / Ppu1_HMA”
- the recombinant strain into which "pACYCDuet-1 :: Eco1” is introduced is “Ec / Eco1_HMA”
- "pACYCDuet-1 :: Aci1” The recombinant strains into which “Ec / Aci1_HMA” and “pACYCDuet-1 :: Spl2” have been introduced are referred to as “Ec / Spl2_HMA”, and the recombinant strains obtained in this comparative example are shown in Table 8 .
- Example 4 Production test of ⁇ -hydromuconic acid using E. coli capable of producing ⁇ -hydromuconic acid into which a nucleic acid encoding the polypeptide of SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 was introduced
- Example 3 The production test of ⁇ -hydromuconic acid was carried out using the E. coli prepared above. Medium I (Bacto tryptone (Difco Laboratories) 10 g / L adjusted to pH 7, Bacto yeast extract (Difco Laboratories) 5 g / L, sodium chloride 5 g / L, kanamycin 25 ⁇ g / mL, streptomycin 50 ⁇ g / mL and chloram The recombinant E.
- coli strain prepared in Example 3 was inoculated into 5 mL of phenicol (15 ⁇ g / mL) and inoculated with one platinum loop, and cultured with shaking at 30 ° C., 120 min ⁇ 1 for 18 hours.
- Medium II succinic acid 10 g / L, glucose 10 g / L, ammonium sulfate 1 g / L, potassium phosphate 50 mM, magnesium sulfate 0.025 g / L, iron sulfate 0.0625 mg
- 0.25 mL of the culture solution was adjusted to pH 6.5 / L, manganese sulfate 2.7 mg / L, calcium chloride 0.33 mg / L, sodium chloride 1.25 g / L, Bacto tryptone 2.5 g / L, Bacto yeast extract 1.25 g / L, kanamycin 25 ⁇ g / mL, streptomycin 50 ⁇ g / mL, chloramphenicol 15 ⁇ g
- Comparative example 4 Production test of ⁇ -hydromuconic acid using E. coli having ability to produce ⁇ -hydromuconic acid into which a nucleic acid encoding 3-oxoadipyl-CoA reductase has been introduced E. coli produced in Comparative Example 3 in the same manner as Example 4.
- Table 8 shows the results of testing production of ⁇ -hydromuconic acid using
- Example 4 has an improved yield of ⁇ -hydromuconic acid than the recombinant strain used in Comparative Example 4. That is, it was found that by introducing a nucleic acid encoding the polypeptide described in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 into a microorganism, the productivity of ⁇ -hydromuconic acid is remarkably improved.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 55 was designed using genomic DNA of Serratia nematodiphila strain DSM 21420 as a template (SEQ ID NO: 50, 51)
- the PCR reaction was performed according to a conventional method.
- a primer for amplifying the nucleic acid described in SEQ ID NO: 56 was designed using genomic DNA of Serratia plymuthica NBRC 102599 strain as a template (SEQ ID NO: 52, 53)
- the PCR reaction was performed according to a conventional method.
- the obtained fragment and pBBR1MCS-2 :: Pgap / ScaI prepared in Reference Example 1 were ligated using In-Fusion HD Cloning Kit and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant strain, and the plasmids whose nucleotide sequences were confirmed by a conventional method were respectively designated as "pBBR1MCS-2 :: Snm1" and "pBBR1MCS-2 :: Spl1".
- Example 5 Preparation of Serratia Microorganism Microorganisms Modified to Enhance the Expression of the Polypeptides Set forth in SEQ ID NOS: 2 and 3 Serratia nematodiphila Strain DSM 21420, a microorganism having a nucleic acid originally encoding the polypeptide of SEQ ID NO: 2 as a host microorganism And, using the Serratia plymuthica NBRC 102599 strain, which is a microorganism having a nucleic acid originally encoding the polypeptide of SEQ ID NO: 3, a recombinant strain in which the expression of the polypeptide possessed by each was increased was produced.
- the pBBR1MCS-2 Snm1 or pBBR1MCS-2 :: Spl prepared in Reference Example 5 was electroporated into each of the aforementioned Serratia microorganism strains (NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801). The strain after introduction was cultured at 30 ° C. in LB agar medium containing 25 ⁇ g / mL of kanamycin. The recombinant strains obtained in this example were named Sn / S nm1 and Sp / Spl1.
- Example 6 Production test of 3-hydroxyadipic acid and ⁇ -hydromuconic acid using Serratia microorganism modified to enhance expression of the polypeptide set forth in SEQ ID NO: 2, 3 Expression of the polypeptide set forth in SEQ ID NO: 2, 3 In order to evaluate the enhanced effect, production tests of 3-hydroxyadipic acid and ⁇ -hydromuconic acid were performed using the recombinant Serratia microorganism strain prepared in Example 5.
- Example 5 In 5 mL of medium I (Bacto tryptone (Difco Laboratories) 10 g / L, Bacto yeast extract (Difco Laboratories) 5 g / L, sodium chloride 5 g / L, kanamycin 25 ⁇ g / mL) adjusted to pH 7 in Example 5
- the prepared recombinant strain was inoculated with one platinum ear and cultured with shaking at 30 ° C., 120 min ⁇ 1 for 18 hours.
- Comparative example 6 Production Test of 3-Hydroxyadipic Acid and ⁇ -Hydromuconic Acid Using Serratia Microorganisms that Do Not Enhance Expression of the Polypeptides Set forth in SEQ ID NOS: 2 and 3
- An Example Using Serratia Microorganisms Produced in Comparative Example 5 The production test of 3-hydroxyadipic acid and ⁇ -hydromuconic acid was conducted in the same manner as in 6. The results are shown in Table 9.
- Comparative example 7 It is confirmed that the polypeptide described in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 has an activity to reduce 3-oxoadipyl-CoA to generate 3-hydroxyadipyl-CoA Control Test for Making Recombinant E. coli expressing enzymes catalyzing Reaction A, Reaction E, and Reaction F were produced.
- pACYCDuet-1 was introduced into BL21 (DE3) / pBBR1MCS-2 :: ATCT.
- the obtained recombinant strain was designated Ec / NC_3HA.
- Example 3 coli strains (Ec / Smr1_HMA, Ec / Snm1_HMA, Ec / Spl1_HMA, Ec / Spe1_HMA, Ec / Sur1_HMA, Ec / Ssp1_HMA, Ec / Slq1_HMA) prepared in Example 3 The culture was performed under the same conditions as in Example 4 to measure 3-hydroxyadipic acid or ⁇ -hydromuconic acid in the culture solution. The results are shown in Table 10.
- Ec / Smr1_3HA, Ec / Snm1_3HA, Ec / Spl1_3HA, Ec / Spe1_3HA, Ec / Sur1_3HA, Ec / Ssp1_3HA, and Ec / Slq1_3HA produced 3-hydroxyadipic acid
- Ec / Sm1_Hm_HMA It was found that ⁇ -hydromuconic acid produced by Ec / Spl1_HMA, Ec / Spe1_HMA, Ec / Sur1_HMA, Ec / Ssp1_HMA, and Ec / Slq1_HMA were both produced via 3-hydroxyadipyr-CoA. Therefore, the polypeptide described in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 has an activity to reduce 3-oxoadipyl-CoA to form 3-hydroxyadipyl-CoA all right.
- Reference Example 6 An enzyme that catalyzes a reaction that produces 3-oxoadipyl-CoA and coenzyme A from acetyl-CoA and succinyl-CoA (reaction A), and an enzyme that catalyzes a reaction that produces adipic acid from adipyl-CoA (reaction G) Preparation of Expressing Plasmid
- the 6.6 kb fragment obtained by cleaving pBBR1MCS-2 :: AT prepared in Reference Example 1 with HpaI was named pBBR1MCS-2 :: AT / HpaI.
- Reference Example 7 Preparation of a plasmid for expressing an enzyme catalyzing a reaction (reaction D) for producing adipyl-CoA from 2,3-dehydroadipyl-CoA
- An expression vector pMW119 (made by Nippon Gene Co., Ltd.) capable of autonomous replication in E. coli is SacI And pMW119 / SacI was obtained.
- Primers were designed (SEQ ID NOS: 225, 226), and PCR reaction was performed according to a conventional method.
- the obtained fragment and pMW119 / SacI were ligated using In-Fusion HD Cloning Kit (manufactured by Clontech), and introduced into E. coli strain DH5 ⁇ .
- the plasmid was extracted from the obtained recombinant E.
- pMW119 :: Pgap the plasmid whose base sequence was confirmed by a conventional method was designated as pMW119 :: Pgap. Subsequently, pMW119 :: Pgap was digested with SphI to obtain pMW119 :: Pgap / SphI.
- a primer was designed to PCR amplify the full length of dcaA (NCBI-Protein ID: AAL 09094.1, SEQ ID NO: 227) from Acinetobacter baylyi ADP1 strain (sequence The PCR reaction was carried out according to a conventional method.
- the obtained fragment and pMW119 :: Pgap / SphI were ligated using In-Fusion HD Cloning Kit (manufactured by Clontech), and introduced into E. coli strain DH5 ⁇ .
- the said plasmid was extracted from the obtained recombinant strain, and the plasmid which confirmed the base sequence by the conventional method was made into pMW119 :: ER.
- Example 7 Preparation of E. coli Having Adipic Acid-Producing Ability into which a Nucleic Acid Encoding the Polypeptide Represented in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 has been Introduced
- Plasmid pBBR1MCS-2 prepared in Reference Example 6 :: ATCT2 was introduced into E. coli strain BL21 (DE3) by electroporation (NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801). The introduced strain was cultured at 37 ° C. on LB agar medium containing 25 ⁇ g / mL kanamycin. The obtained recombinant strain was designated BL21 (DE3) / pBBR1 MCS-2 :: ATCT2.
- the plasmid pCDF-1b :: EHa prepared in Reference Example 4 was introduced into BL21 (DE3) / pBBR1 MCS-2 :: ATCT2 by electroporation.
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin and 50 g / mL streptomycin.
- the resulting recombinant strain was designated BL21 (DE3) / pBBR1 MCS-2 :: ATCT2 / pCDF-1b :: EHa.
- the plasmid pMW119 :: ER prepared in Reference Example 7 was electroporated into BL21 (DE3) / pBBR1 MCS-2 :: ATCT2 / pCDF-1b :: EHa.
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin, 50 ⁇ g / mL streptomycin and 100 ⁇ g / mL ampicillin.
- the obtained recombinant strain was designated BL21 (DE3) / pBBR1MCS-2 :: ATCT2 / pCDF-1b :: EHa / pMW119 :: ER.
- the seven types of plasmids prepared in Reference Example 2 were electroporated into BL21 (DE3) / pBBR1 MCS-2 :: ATCT2 / pCDF-1b :: EHa / pMW119 :: ER, respectively.
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin, 50 ⁇ g / mL streptomycin, 100 ⁇ g / mL ampicillin and 15 ⁇ g / mL chloramphenicol.
- the recombinant strain into which “pACYCDuet-1 :: Smr1” has been introduced is “Ec / Smr1_ADA”, and the recombinant strain into which “pACYCDuet-1 :: Snm1” has been introduced is “Ec / Snm1_ADA”, “pACYCDuet-1 :: Spl1” "Ec / Spl1_ADA”, the recombinant strain into which "pACYCDuet-1 :: Spe1” has been introduced “Ec / Spe1_ADA”, the recombinant strain into which "pACYCDuet-1 :: Sur1” has been introduced " The recombinant strains into which Ec / Sur1_ADA and pACYCDuet-1 :: Ssp1 have been introduced are referred to as "Ec / Ssp1_ADA” and the recombinant strains into which pACYCDuet-1 ::
- the introduced strain was cultured at 37 ° C. on an LB agar medium containing 25 ⁇ g / mL kanamycin, 50 ⁇ g / mL streptomycin, 100 ⁇ g / mL ampicillin and 15 ⁇ g / mL chloramphenicol.
- the recombinant strain into which "pACYCDuet-1 :: Ppu1" has been introduced is “Ec / Ppu1_ADA”
- the recombinant strain into which "pACYCDuet-1 :: Eco1” has been introduced is “Ec / Eco1_ADA”
- Ec / Aci1_ADA” and the recombinant strain into which "pACYCDuet-1 :: Spl2” was introduced are referred to as "Ec / Spl2_ADA”
- the recombinant strains obtained in this comparative example are shown in Table 11 .
- Example 8 Production test of adipic acid using E. coli capable of producing adipic acid into which a nucleic acid encoding the polypeptide set forth in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 has been introduced E. coli prepared in Example 7
- the production test of adipic acid was conducted using Medium I (Bacto tryptone (Difco Laboratories) 10 g / L adjusted to pH 7, Bacto yeast extract (Difco Laboratories) 5 g / L, sodium chloride 5 g / L, kanamycin 25 ⁇ g / mL, streptomycin 50 ⁇ g / mL, ampicillin 100 ⁇ g
- Example 3 coli strain prepared in Example 3 was inoculated into 5 mL of (mL / mL and chloramphenicol (15 ⁇ g / mL)) and cultured with shaking at 30 ° C. and 120 min ⁇ 1 for 18 hours.
- Comparative Example 9 Production test of adipic acid using E. coli capable of producing adipic acid into which a nucleic acid encoding 3-oxoadipyl-CoA reductase has been introduced Adipine was prepared using E. coli prepared in Comparative Example 8 in the same manner as in Example 8. The results of the acid production test are shown in Table 11.
- Example 8 has an improved adipic acid yield than the recombinant strain used in Comparative Example 9. That is, it was found that by introducing a nucleic acid encoding the polypeptide set forth in SEQ ID NO: 1, 2, 3, 4, 5, 6, 213 into a microorganism, the productivity of adipic acid is remarkably improved.
- Example 9 Confirmation that the polypeptides described in SEQ ID NOS: 2 and 4 have the activity of 3-oxoadipyl-CoA reductase
- the strain BL21 (DE3) was introduced by electroporation. The introduced strain was cultured at 37 ° C. on LB agar medium containing 15 ⁇ g / mL of chloramphenicol. The resulting recombinant strains were designated BL21 (DE3) / pACYCDuet-1 :: Snm1 and BL21 (DE3) / pACYCDuet-1 :: Spe1.
- IPTG was added to the culture solution to a concentration of 500 ⁇ M, and shaking culture was performed at 16 ° C. and 100 min ⁇ 1 for 18 hours.
- the culture solution was centrifuged at 6,000 rpm for 15 minutes at 4 ° C., and the supernatant was removed, and the cell pellet was suspended in Binding Buffer of His-Bind Buffer Kit (Merck).
- the resulting cell suspension was sonicated with Digital Sonifier (manufactured by BRANSON) while cooling with ice.
- the solution after disruption was centrifuged at 13000 rpm and 4 ° C. for 30 minutes, and the obtained supernatant was used as a cell disruption solution.
- His-Bind Resin solution was added to 30 mL of the cell lysate and incubated at 4 ° C. for 1 hour. The solution was centrifuged at 4000 rpm for 5 minutes at 4 ° C., and 20 mL of the supernatant was removed, and then the His-Bind Resin solution was loaded onto the column. After washing twice with 10 mL of Binding Buffer, it was washed twice with 10 mL of Wash Buffer 1 (imidazole 25 mM) and twice with 10 mL of Wash Buffer 2 (imidazole 60 mM). Finally, it was eluted four times with 2 mL of Elution Buffer (imidazole 1 mM), and the fractions were collected.
- the fraction whose band could be confirmed around 55 kDa which is the molecular weight of the target enzyme was centrifuged at 8000 rpm and 4 ° C. for 15 minutes, the supernatant was removed, and 5 mL of Strage Buffer was added and washed. After further centrifuging at 8000 rpm and 4 ° C. for 15 minutes and removing the supernatant, adding 3 mL of Strage Buffer was repeated twice. The obtained solutions were named enzyme solutions Snm1 and Spe1.
- 3-oxoadipic acid was prepared by the method described in Reference Example 1 of WO 2017/099209.
- PCR is performed on the full length of CoA transferase pcaI and pcaJ (NCBI-GeneID: 1046613 and 1046612, SEQ ID NOS: 23 and 24) using genomic DNA of Pseudomonas putida strain KT2440 as a template Primers for amplification were designed (SEQ ID NOS: 230, 231), and PCR was performed according to a conventional method.
- the obtained fragment and pRSF-1b / KpnI were ligated using In-Fusion HD Cloning Kit (manufactured by Clontech), and introduced into E. coli strain DH5 ⁇ .
- the said plasmid was extracted from the obtained recombinant strain, and the base sequence was confirmed by a conventional method.
- the obtained plasmid was called "pRSF-1b :: CT".
- pRSF-1b CT was introduced into E. coli BL21 (DE3) and induction of expression of the enzyme by isopropyl-.beta.-thiogalactopyranoside (IPTG) in a conventional manner, followed by purification using a histidine tag from the culture broth To obtain a CoA transferase solution.
- the enzyme reaction solution for preparation of 3-oxoadipyl-CoA having the following composition is prepared using the solution, reacted at 25 ° C. for 3 minutes, and treated with UF membrane (Amicon Ultra-0.5 mL 10 K, manufactured by Merck Millipore) The resulting permeate was used as a solution of 3-oxoadipyl-CoA.
- Enzyme reaction solution for preparation of 3-oxoadipyl-CoA 100 mM Tris-HCl (pH 8.2) 10 mM MgCl 2 0.5 mM succini-CoA 5mM 3-oxoadipic acid sodium salt 2 ⁇ M CoA transferase.
- 3-oxoadipyl-CoA reductase activity was confirmed by measuring the amount of 3-hydroxyadipyl-CoA produced.
- An enzyme reaction solution of the following composition is prepared using enzyme solutions Snm1 and Spe1, and the enzyme reaction solution after reaction at 25 ° C. for 1 hour is subjected to membrane treatment using Millex-GV (0.22 ⁇ m, PVDF, manufactured by Merck) The permeate was analyzed by LC-MS / MS under the same conditions as in Example 2.
- the 3-oxoadipyl-CoA concentration was quantified using the method of Kaschabek et al. (J Bacteriol. 2002 Jan; 184 (1): 207-215), and the concentration in the enzyme reaction solution was adjusted to 15 ⁇ M.
- the results of similar reactions by adding Tris-HCl instead of the enzyme solution as a control are also shown in Table 12.
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Abstract
Description
(a)配列番号1~6及び213のいずれかのアミノ酸配列からなるポリペプチド、
(b)配列番号1~6及び213のいずれかのアミノ酸配列において、1もしくは数個のアミノ酸が置換、欠失、挿入及び/または付加されたアミノ酸配列からなり、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する反応を触媒する酵素活性を有するポリペプチド、
(c)配列番号1~6及び213のいずれかのアミノ酸配列に対して70%以上の配列同一性を有し、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する反応を触媒する酵素活性を有するポリペプチド。
(2) 前記(b)及び(c)のいずれかに記載のポリペプチドが、配列番号212のアミノ酸配列からなる領域を含む、(1)記載の遺伝子改変微生物。
(3) 前記配列番号212のアミノ酸配列において、N末端側から13番目のアミノ酸残基がフェニルアラニンまたはロイシンであり、N末端側から15番目のアミの酸残基がロイシンまたはグルタミンであり、N末端側から16番目のアミノ酸残基がリシンまたはアスパラギンであり、N末端側から17番目のアミノ酸残基がグリシンまたはセリンであり、N末端側から19番目のアミノ酸残基がプロリンまたはアルギニンであり、N末端側から21番目のアミノ酸残基が好ましくはロイシン、メチオニンまたはバリンである、(2)記載の遺伝子改変微生物。
(4) Escherichia属、Serratia属、Hafnia属及びPseudomonas属からなる群から選ばれる微生物の遺伝子改変体である、(1)~(3)のいずれか1項に記載の遺伝子改変微生物。
(5) アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力及び3-ヒドロキシアジピル-CoAから3-ヒドロキシアジピン酸を生成する能力を有する、(1)~(4)のいずれか1項に記載の遺伝子改変微生物。
(6) アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力、3-ヒドロキシアジピル-CoAから2,3-デヒドロアジピル-CoAを生成する能力及び2,3-デヒドロアジピル-CoAからα-ヒドロムコン酸を生成する能力を有する、(1)~(4)のいずれか1項に記載の遺伝子改変微生物。
(7) アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力、3-ヒドロキシアジピル-CoAから2,3-デヒドロアジピル-CoAを生成する能力、2,3-デヒドロアジピル-CoAからアジピル-CoAを生成する能力及びアジピル-CoAからアジピン酸を生成する能力を有する、(1)~(4)のいずれか1項に記載の遺伝子改変微生物。
(8) (1)~(5)のいずれかに記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、3-ヒドロキシアジピン酸の製造方法。
(9) (1)~(4)及び(6)のいずれか1項に記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、α-ヒドロムコン酸の製造方法。
(10) (1)~(4)及び(7)のいずれか1項に記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、アジピン酸の製造方法。
(11) Serratia属微生物において5-アミノレブリン酸シンターゼ遺伝子と遺伝子クラスターを構成する3-ヒドロキシブチリル-CoAデヒドロゲナーゼ遺伝子にコードされるポリペプチドをコードする核酸を導入または当該ポリペプチドの発現を増強した遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、3-ヒドロキシアジピン酸、α-ヒドロムコン酸及びアジピン酸からなる群から選ばれる1つ以上の物質の製造方法。
(a)配列番号1~6および213のいずれかに記載のアミノ酸配列からなるポリペプチド
(b)配列番号1~6および213のいずれかに記載のアミノ酸配列において、1もしくは数個のアミノ酸が置換、欠失、挿入および/または付加されたアミノ酸配列からなり、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する反応を触媒する酵素活性を有するポリペプチド
(c)配列番号1~6および213のいずれかに記載のアミノ酸配列に対して70%以上の配列同一性を有し、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する活性を有するポリペプチド
式(1)に従い、Genetyxの機能(%Identity Matrix)を用いて配列番号1~6および213に記載のアミノ酸配列間の配列同一性を算出すると、最も配列同一性の値が低い配列番号2と4との値は71.51%となり、配列番号1~6および213に記載のアミノ酸配列は、お互いに少なくとも70%以上の配列同一性を有している。Genetyxを用いた配列同一性の算出結果を表1に示す。なお、下記表1~表5において、一番左側の数字は配列番号を示す。
カラム:Synergi hydro-RP(Phenomenex社製)、長さ100mm、内径3mm、粒径2.5μm
移動相:0.1%ギ酸水溶液/メタノール=70/30
流速:0.3mL/分
カラム温度:40℃
LC検出器:DAD(210nm)
・MS/MS:Triple-Quad LC/MS(Agilent Technologies社製)
イオン化法:ESI ネガティブモード。
100mM Tris-HCl(pH8.2)
10mM MgCl2
0.5mM succiniy-CoA
5mM 3-oxoadipic acid sodium salt
2μM CoA transferase。
10mM MgCl2
150μL/mL 3-oxoadipyl-CoA solution
0.5mM NADH
1mM dithiothreitol
10μM 3-oxoadipyl-CoA reductase。
10mM MgCl2
0.1mM succinyl-CoA
0.2mM acetyl-CoA
0.2mM NADH
1mM dithiothreitol
10μg/mL 3-oxoadipyl-CoA reductase
5μg/mL acyltransferase。
100mM Tris-HCl(pH8.0)
10mM MgCl2
0.4mM succiniy-CoA
2mM α-hydromuconic acid sodium salt
20μg/mL CoA transferase。
10mM MgCl2
300μL/mL 2,3-dehydroadipyl-CoA solution
1mM dithiothreitol
20μg/mL enoyl-CoA hydratase。
10mM MgCl2
300μL/mL 2,3-dehydroadipyl-CoA solution0.2mM NADH
1mM dithiothreitol
20μg/mL enoyl-CoA reductase。
10mM MgCl2
0.4mM succiniy-CoA
2mM 3-hydroxyadipic acid sodium salt
20μg/mL CoA transferase。
10mM MgCl2
0.4mM succiniy-CoA
2mM α-hydromuconic acid sodium salt
20μg/mL CoA transferase。
10mM MgCl2
0.4mM succiniy-CoA
2mM adipic acid sodium salt
20μg/mL CoA-transferase。
カラム:Synergi hydro-RP(Phenomenex社製)、長さ100mm、内径3mm、粒径2.5μm
移動相:0.1%ギ酸水溶液/メタノール=70/30
流速:0.3mL/分
カラム温度:40℃
LC検出器:DAD(210nm)
・MS/MS:Triple-Quad LC/MS(Agilent Technoogies社製)
イオン化法:ESI ネガティブモード。
カラム:Shodex Sugar SH1011(昭和電工株式会社製)、長さ300 mm、内径8 mm、粒径6μm
移動相:0.05M 硫酸水溶液
流速:0.6mL/min
カラム温度:65℃
検出器:RI。
アセチル-CoAおよびスクシニル-CoAから3-オキソアジピル-CoAおよび補酵素Aを生成する反応(反応A)を触媒する酵素、及び3-ヒドロキシアジピル-CoAから3-ヒドロキシアジピン酸を生成する反応(反応E)かつ2,3-デヒドロアジピル-CoAからα-ヒドロムコン酸を生成する反応(反応F)を触媒する酵素を発現するプラスミドの作製
大腸菌内で自律複製可能なベクターpBBR1MCS-2(ME Kovach, (1995), Gene 166: 175-176)をXhoIで切断し、pBBR1MCS-2/XhoIを得た。当該ベクターに構成的な発現プロモーターを組み込むために、Escherichia coli K-12 MG1655のゲノムDNAを鋳型としてgapA(NCBI Gene ID: NC_000913.3)の上流域200b(配列番号17)をPCR増幅するためのプライマーを設計し(配列番号18、19)、常法に従ってPCR反応を行った。得られた断片およびpBBR1MCS-2/XhoI を、In-Fusion HD Cloning Kit(Clontech社製)を用いて連結し、大腸菌株DH5αに導入した。得られた組換え大腸菌株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpBBR1MCS-2::Pgapとした。続いてpBBR1MCS-2::PgapをScaIで切断し、pBBR1MCS-2::Pgap/ScaI を得た。 反応Aを触媒する酵素をコードする遺伝子を増幅するために、Pseudomonas putida KT2440株のゲノムDNAを鋳型としてアシルトランスフェラーゼ遺伝子pcaF(NCBI Gene ID: 1041755、配列番号20)の全長をPCR増幅するためのプライマーを設計し(配列番号21、22)、常法に従ってPCR反応を行った。得られた断片およびpBBR1MCS-2::Pgap/ScaIを、In-Fusion HD Cloning Kitを用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpBBR1MCS-2::ATとした。続いてpBBR1MCS-2::ATをHpaIで切断し、pBBR1MCS-2::AT/HpaIを得た。反応Eおよび反応Fを触媒する酵素をコードする遺伝子を増幅するために、Pseudomonas putida KT2440株のゲノムDNAを鋳型としてCoAトランスフェラーゼ遺伝子PcaIおよびPcaJ(NCBI Gene ID: 1046613、1046612、配列番号23、24)の全長を含む連続した配列をPCR増幅するためのプライマーを設計し(配列番号25、26)、常法に従ってPCR反応を行った。得られた断片およびpBBR1MCS-2::AT/HpaIを、In-Fusion HD Cloning Kitを用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpBBR1MCS-2::ATCTとした。
配列番号1、2、3、4、5、6、213に記載のポリペプチドを発現するためのプラスミドの作製
大腸菌内で自律複製可能な発現ベクターpACYCDuet-1(Novagen社製)をBamHIで切断し、pACYCDuet-1/BamHIを得た。配列番号1のポリペプチドをコードする核酸を増幅するために、Serratia marcescens ATCC13880株のゲノムDNAを鋳型として、配列番号54に記載の核酸を増幅するためのプライマーを設計し(配列番号31、32)、常法に従ってPCR反応を行った。配列番号2のポリペプチドをコードする核酸を増幅させるために、Serratia nematodiphila DSM21420株のゲノムDNAを鋳型として、配列番号55に記載の核酸を増幅するためのプライマーを設計し(配列番号33,34)、常法に従ってPCR反応を行った。配列番号3のポリペプチドをコードする核酸を増幅させるために、Serratia plymuthica NBRC102599株のゲノムDNAを鋳型として、配列番号56に記載の核酸を増幅するためのプライマーを設計し(配列番号35,36)、常法に従ってPCR反応を行った。配列番号4のポリペプチドをコードする核酸を増幅させるために、Serratia proteamaculans 568株のゲノムDNAを鋳型として、配列番号57に記載の核酸を増幅するためのプライマーを設計し(配列番号37,38)、常法に従ってPCR反応を行った。配列番号5のポリペプチドをコードする核酸を増幅させるために、Serratia ureilytica Lr5/4株のゲノムDNAを鋳型として、配列番号58に記載の核酸を増幅するためのプライマーを設計し(配列番号215,216)、常法に従ってPCR反応を行った。配列番号6のポリペプチドをコードする核酸を増幅させるために、Serratia sp. BW106株のゲノムDNAを鋳型として、配列番号59に記載の核酸を増幅するためのプライマーを設計し(配列番号217,218)、常法に従ってPCR反応を行った。配列番号213のポリペプチドをコードする核酸を増幅させるために、Serratia liquefaciens FK01株のゲノムDNAを鋳型として、配列番号214に記載の核酸を増幅するためのプライマーを設計し(配列番号219,220)、常法に従ってPCR反応を行った。得られたそれぞれの断片およびpACYCDuet-1/BamHI を、In-Fusion HD Cloning Kit(Clontech社製)を用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認した。なお当該プラスミドに組み込まれた3-オキソアジピル-CoAレダクターゼの発現はIPTGで誘導され、N末端にヒスチジンタグを含む14個のアミノ酸が付加されている。
3-オキソアジピル-CoAレダクターゼを発現するためプラスミドの作製
本発明の(a)~(c)に記載のポリペプチド以外で、3-オキソアシル-CoAを基質として3-ヒドロキシアシル-CoAを生成する還元反応を触媒する4種類の酵素を発現するためのプラスミドを作製した。Pseudomonas putida KT2440株由来のpaaH(配列番号27)、Escherichia coli str. K-12 substr. MG1655株由来のpaaH(配列番号28)、Acinetobacter baylyi ADP1株由来のdcaH(配列番号29)、Serratia plymuthica NBRC102599株由来のpaaH(配列番号30)の4種類を用いた。配列番号27に記載の核酸を増幅するためのプライマーとして(配列番号39,40)、配列番号28に記載の核酸を増幅するためのプライマーとして(配列番号41,42)、
配列番号1,2,3,4、5、6、213に記載のポリペプチドをコードする核酸が導入された3-ヒドロキシアジピン酸生産能を有する大腸菌の作製
参考例1で作製したプラスミドpBBR1MCS-2::ATCTを、大腸菌株BL21(DE3)にエレクトロポレーション(NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801)で導入した。導入後の当該株をカナマイシン25μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/ pBBR1MCS-2::ATCTとした。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入された3-ヒドロキシアジピン酸生産能を有する大腸菌の作製
参考例1で作製したプラスミドpBBR1MCS-2::ATCTを、大腸菌株BL21(DE3)にエレクトロポレーション(NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801)で導入した。導入後の当該株をカナマイシン25μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/ pBBR1MCS-2::ATCTとした。
配列番号1,2,3,4、5、6、213に記載のポリペプチドをコードする核酸が導入された3-ヒドロキシアジピン酸生産能を有する大腸菌を用いた3-ヒドロキシアジピン酸の生産試験
実施例1で作製した組換え大腸菌株を用いて、3-ヒドロキシアジピン酸の生産試験を行った。
当該培養液より菌体を遠心分離した上清をMillex-GV(0.22μm、PVDF、Merck社製)を用いて膜処理し、透過液を以下の方法で分析することで培養上清中に蓄積した3-ヒドロキシアジピン酸および炭素源の濃度を定量した。その結果を表7に示す。また式(3)用いて算出した3-ヒドロキシアジピン酸の収率を表7に示す。
・HPLC:1290Infinity(Agilent Technologies社製)
カラム:Synergi hydro-RP(Phenomenex社製)、長さ100mm、内径3mm、粒径2.5μm
移動相:0.1%ギ酸水溶液/メタノール=70/30
流速:0.3mL/分
カラム温度:40℃
LC検出器:DAD(210nm)
・MS/MS:Triple-Quad LC/MS(Agilent Technologies社製)
イオン化法:ESI ネガティブモード。
・HPLC:Shimazu Prominence(島津製作所製)
カラム:Shodex Sugar SH1011(昭和電工株式会社製)、長さ300 mm、内径8 mm、粒径6μm
移動相:0.05M 硫酸水溶液
流速:0.6mL/min
カラム温度:65℃
検出器:RI
・HPLC:1290Infinity(Agilent Technologies社製)
カラム:Synergi hydro-RP(Phenomenex社製)、長さ100mm、内径3mm、粒径2.5μm
移動相:0.1%ギ酸水溶液/メタノール=70/30
流速:0.3mL/分
カラム温度:40℃
LC検出器:DAD(210nm)
・MS/MS:Triple-Quad LC/MS(Agilent Technologies社製)
イオン化法:ESI ネガティブモード。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入された3-ヒドロキシアジピン酸生産能を有する大腸菌を用いた3-ヒドロキシアジピン酸の生産試験
実施例2と同様の方法にて、比較例1で作製した大腸菌を用いて3-ヒドロキシアジピン酸の生産試験を行った結果を表7に示す。
3-ヒドロキシアジピル-CoAから2,3-デヒドロアジピル-CoAを生成する反応(反応C)を触媒する酵素を発現するためのプラスミドの作製
大腸菌内で自律複製可能な発現ベクターpCDF-1b(Novagen社製)をKpnIで切断し、pCDF-1b/KpnIを得た。反応Cを触媒する酵素をコードする遺伝子を増幅するために、Pseudomonas putida KT2440株のゲノムDNAを鋳型としてエノイル-CoAヒドラターゼ遺伝子paaF(NCBI Gene ID: 1046932、配列番号47)の全長をPCR増幅するためのプライマーを設計し(配列番号48、49)、常法に従ってPCR反応を行った。得られた断片およびpCDF-1b/KpnI を、In-Fusion HD Cloning Kit(Clontech社製)を用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認した。なお当該プラスミドに組み込まれたエノイル-CoAヒドラターゼの発現はIPTGで誘導され、N末端にヒスチジンタグを含む11個のアミノ酸が付加されている。得られたプラスミドを「pCDF-1b::EHa」とした。
配列番号1、2、3、4、5、6、213に記載のポリペプチドをコードする核酸が導入されたα-ヒドロムコン酸生産能を有する大腸菌の作製
参考例4で作製したプラスミドpCDF-1b::EHaを、実施例1で作製した大腸菌株BL21(DE3)/pBBR1MCS-2::ATCTにエレクトロポレーションで導入した。導入後の当該株をカナマイシン25μg/mLおよびストレプトマイシン50μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/pBBR1MCS-2::ATCT/ pCDF-1b::EHaとした。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入されたα-ヒドロムコン酸生産能を有する大腸菌の作成
参考例4で作製したプラスミドpCDF-1b::EHaを、参考例2で作製した大腸菌株BL21(DE3)/ pBBR1MCS-2::ATCTにエレクトロポレーションで導入した。導入後の当該株をカナマイシン25μg/mLおよびストレプトマイシン50μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/ pBBR1MCS-2::ATCT/ pCDF-1b::EHaとした。
配列番号1、2、3、4、5、6、213に記載のポリペプチドをコードする核酸が導入されたα-ヒドロムコン酸生産能を有する大腸菌を用いたα-ヒドロムコン酸の生産試験
実施例3で作製した大腸菌を用いてα-ヒドロムコン酸の生産試験を行った。pH7に調整した培地I(Bactoトリプトン(Difco Laboratories社製)10g/L、Bacto酵母エキス(Difco Laboratories社製)5g/L、塩化ナトリウム5g/L、カナマイシン25μg/mL、ストレプトマイシン50μg/mLおよびクロラムフェニコール15μg/mL)5mLに、実施例3で作製した組換え大腸菌株を一白金耳植菌し、30℃、120min-1で18時間振とう培養した。当該培養液0.25mLをpH6.5に調整した培地II(コハク酸10g/L、グルコース10g/L、硫酸アンモニウム1g/L、リン酸カリウム50mM、硫酸マグネシウム0.025g/L、硫酸鉄0.0625mg/L、硫酸マンガン2.7mg/L、塩化カルシウム0.33mg/L、塩化ナトリウム1.25g/L、Bactoトリプトン2.5g/L、Bacto酵母エキス1.25g/L、カナマイシン25μg/mL、ストレプトマイシン50μg/mL、クロラムフェニコール15μg/mLおよびIPTG0.01mM)5mLに添加し、30℃、120min-1で24時間振とう培養した。
当該培養液より菌体を遠心分離した上清をMillex-GV(0.22μm、PVDF、Merck社製)を用いて膜処理し、透過液を実施例2と同様の条件でLC-MS/MSにて分析した。培養上清中に蓄積したα-ヒドロムコン酸の定量分析を行った結果、および式(3)を用いて算出したα-ヒドロムコン酸の収率を表8に示す。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入されたα-ヒドロムコン酸生産能を有する大腸菌を用いたα-ヒドロムコン酸の生産試験
実施例4と同様の方法にて、比較例3で作製した大腸菌を用いてα-ヒドロムコン酸の生産試験を行った結果を表8に示す。
配列番号2、3に記載のポリペプチドの発現を増強するためのプラスミドの作製
配列番号2、3に記載のポリペプチドを構成的に発現するための様々なプラスミドを作製した。
配列番号2、3に記載のポリペプチドの発現を増強するように改変したSerratia属微生物の作製
宿主微生物として、元来配列番号2のポリペプチドをコードする核酸を有する微生物であるSerratia nematodiphila DSM21420株、および元来配列番号3のポリペプチドをコードする核酸を有する微生物であるSerratia plymuthica NBRC102599株を用いて、それぞれが有するポリペプチドの発現を増大させた組換え株を作製した。参考例5で作製したpBBR1MCS-2::Snm1あるいはpBBR1MCS-2::Spl1を、上述のSerratia属微生物株それぞれにエレクトロポレーション(NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801)で導入した。導入後の当該株をカナマイシン25μg/mLを含有するLB寒天培地にて、30℃で培養した。本実施例で得られた組換え株をSn/Snm1、Sp/Spl1とした。
配列番号2、3に記載のポリペプチドの発現を増強するように改変したSerratia属微生物を用いた3-ヒドロキシアジピン酸およびα-ヒドロムコン酸生産試験
配列番号2、3に記載のポリペプチドの発現を増強した効果を評価するために、実施例5で作製した組換えSerratia属微生物株を用いて、3-ヒドロキシアジピン酸およびα-ヒドロムコン酸の生産試験を行った。
当該培養液より菌体を遠心分離した上清をMillex-GV(0.22μm、PVDF、Merck社製)を用いて膜処理し、透過液を実施例2と同様の条件でLC-MS/MSにて分析した。培養上清中に蓄積した3-ヒドロキシアジピン酸およびα-ヒドロムコン酸の定量分析を行った結果およびそれぞれの収率を表9に示す。
配列番号2、3に記載のポリペプチドの発現を増強していないSerratia属微生物の作製
実施例5と同様の方法にて、pBBR1MCS-2::gapをSerratia nematodiphila DSM21420株およびSerratia plymuthica NBRC102599株それぞれに導入した。得られた組換え株をSn/NC、およびSp/NCとした。
配列番号2、3に記載のポリペプチドの発現を増強していないSerratia属微生物を用いた3-ヒドロキシアジピン酸およびα-ヒドロムコン酸の生産試験
比較例5で作製したSerratia属微生物を用いて実施例6と同様の方法にて3-ヒドロキシアジピン酸およびα-ヒドロムコン酸の生産試験を行った。結果を表9に示す。
配列番号1、2、3、4、5、6、213に記載のポリペプチドが、3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する活性を有していることを確認するためのコントロール試験
反応Aと反応E、反応Fを触媒する酵素を発現させた組換え大腸菌を作製した。実施例1と同様の方法にて、pACYCDuet-1をBL21(DE3)/ pBBR1MCS-2::ATCTに導入した。得られた組換え株をEc/NC_3HAとした。
アセチル-CoAおよびスクシニル-CoAから3-オキソアジピル-CoAおよび補酵素Aを生成する反応(反応A)を触媒する酵素、及びアジピル-CoAからアジピン酸を生成する反応(反応G)を触媒する酵素を発現するプラスミドの作製
参考例1で作製したpBBR1MCS-2::ATをHpaIで切断して得られる6.6kbの断片をpBBR1MCS-2::AT/HpaIとした。反応Gを触媒する酵素をコードする遺伝子を増幅するために、Acinetobacter baylyi ADP1株のゲノムDNAを鋳型としてCoAトランスフェラーゼ遺伝子dcaIおよびdcaJ(NCBI Gene ID:CR543861.1、配列番号221、222)の全長を含む連続した配列をPCR増幅するためのプライマーを設計し(配列番号223、224)、常法に従ってPCR反応を行った。得られた断片およびpBBR1MCS-2::AT/HpaIを、In-Fusion HD Cloning Kitを用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpBBR1MCS-2::ATCT2とした。
2,3-デヒドロアジピル-CoAからアジピル-CoAを生成する反応(反応D)を触媒する酵素を発現するためのプラスミドの作製
大腸菌内で自律複製可能な発現ベクターpMW119(ニッポンジーン社製)をSacIで切断し、pMW119/SacIを得た。当該ベクターに構成的な発現プロモーターを組み込むために、Escherichia coli K-12 MG1655のゲノムDNAを鋳型としてgapA(NCBI Gene ID: NC_000913.3)の上流域200b(配列番号17)をPCR増幅するためのプライマーを設計し(配列番号225、226)、常法に従ってPCR反応を行った。得られた断片およびpMW119/SacIを、In-Fusion HD Cloning Kit(Clontech社製)を用いて連結し、大腸菌株DH5αに導入した。得られた組換え大腸菌株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpMW119::Pgapとした。続いてpMW119::PgapをSphIで切断し、pMW119::Pgap/SphIを得た。反応Dを触媒する酵素をコードする遺伝子を増幅するために、Acinetobacter baylyi ADP1株由来のdcaA(NCBI-ProteinID:AAL09094.1、配列番号227)の全長をPCR増幅するためのプライマーを設計し(配列番号228、229)、常法に従ってPCR反応を行った。得られた断片およびpMW119::Pgap/SphIを、In-Fusion HD Cloning Kit(Clontech社製)を用いて連結し、大腸菌株DH5αに導入した。得られた組換え株から当該プラスミドを抽出し、常法により塩基配列を確認したプラスミドをpMW119::ERとした。
配列番号1、2、3、4、5、6、213に記載のポリペプチドをコードする核酸が導入されたアジピン酸生産能を有する大腸菌の作製
参考例6で作製したプラスミドpBBR1MCS-2::ATCT2を、大腸菌株BL21(DE3)にエレクトロポレーション(NM Calvin, PC Hanawalt. J. Bacteriol, 170 (1988), pp. 2796-2801)で導入した。導入後の当該株をカナマイシン25μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/pBBR1MCS-2::ATCT2とした。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入されたアジピン酸生産能を有する大腸菌の作成
参考例3で作製したプラスミド「pACYCDuet-1::Ppu1」、「pACYCDuet-1::Eco1」、「pACYCDuet-1::Aci1」、「pACYCDuet-1::Spl2」それぞれを、BL21(DE3)/pBBR1MCS-2::ATCT2/pCDF-1b::EHa/pMW119::ERにエレクトロポレーションで導入した。導入後の当該株をカナマイシン25μg/mL、ストレプトマイシン50μg/mL、アンピシリン100μg/mLおよびクロラムフェニコール15μg/mLを含有するLB寒天培地にて、37℃で培養した。
配列番号1、2、3、4、5、6、213に記載のポリペプチドをコードする核酸が導入されたアジピン酸生産能を有する大腸菌を用いたアジピン酸の生産試験
実施例7で作製した大腸菌を用いてアジピン酸の生産試験を行った。pH7に調整した培地I(Bactoトリプトン(Difco Laboratories社製)10g/L、Bacto酵母エキス(Difco Laboratories社製)5g/L、塩化ナトリウム5g/L、カナマイシン25μg/mL、ストレプトマイシン50μg/mL、アンピシリン100μg/mLおよびクロラムフェニコール15μg/mL)5mLに、実施例3で作製した組換え大腸菌株を一白金耳植菌し、30℃、120min-1で18時間振とう培養した。当該培養液0.25mLをpH6.5に調整した培地II(コハク酸10g/L、グルコース10g/L、硫酸アンモニウム1g/L、リン酸カリウム50mM、硫酸マグネシウム0.025g/L、硫酸鉄0.0625mg/L、硫酸マンガン2.7mg/L、塩化カルシウム0.33mg/L、塩化ナトリウム1.25g/L、Bactoトリプトン2.5g/L、Bacto酵母エキス1.25g/L、カナマイシン25μg/mL、ストレプトマイシン50μg/mL、アンピシリン100μg/mLおよびクロラムフェニコール15μg/mLおよびIPTG0.01mM)5mLに添加し、30℃、120min-1で24時間振とう培養した。
当該培養液より菌体を遠心分離した上清をMillex-GV(0.22μm、PVDF、Merck社製)を用いて膜処理し、透過液を実施例2と同様の条件でLC-MS/MSにて分析した。培養上清中に蓄積したアジピン酸の定量分析を行った結果、および式(3)を用いて算出したアジピン酸の収率を表11に示す。
3-オキソアジピル-CoAレダクターゼをコードする核酸が導入されたアジピン酸生産能を有する大腸菌を用いたアジピン酸の生産試験
実施例8と同様の方法にて、比較例8で作製した大腸菌を用いてアジピン酸の生産試験を行った結果を表11に示す。
配列番号2および4に記載のポリペプチドが3-オキソアジピル-CoAレダクターゼの活性を有していることの確認
参考例2で作製したプラスミドpACYCDuet-1::Snm1およびpACYCDuet-1::Spe1を、大腸菌株BL21(DE3)にエレクトロポレーションで導入した。導入後の当該株をクロラムフェニコール15μg/mLを含有するLB寒天培地にて37℃で培養した。得られた組み換え株をBL21(DE3)/pACYCDuet-1::Snm1およびBL21(DE3)/pACYCDuet-1::Spe1とした。
100mM Tris-HCl(pH8.2)
10mM MgCl2
0.5mM succiniy-CoA
5mM 3-oxoadipic acid sodium salt
2μM CoA transferase。
10mM MgCl2
150μL/mL 3-oxoadipyl-CoA solution
0.5mM NADH
1mM dithiothreitol
10μM 3-oxoadipyl-CoA reductase。
Claims (11)
- 以下(a)~(c)のいずれかに記載のポリペプチドをコードする核酸を導入、または当該ポリペプチドの発現を増強した遺伝子改変微生物:
(a)配列番号1~6及び213のいずれかのアミノ酸配列からなるポリペプチド、
(b)配列番号1~6及び213のいずれかのアミノ酸配列において、1もしくは数個のアミノ酸が置換、欠失、挿入及び/または付加されたアミノ酸配列からなり、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する反応を触媒する酵素活性を有するポリペプチド、
(c)配列番号1~6及び213のいずれかのアミノ酸配列に対して70%以上の配列同一性を有し、かつ3-オキソアジピル-CoAを還元して3-ヒドロキシアジピル-CoAを生成する反応を触媒する酵素活性を有するポリペプチド。 - 前記(b)及び(c)のいずれかに記載のポリペプチドが、配列番号212のアミノ酸配列からなる領域を含む、請求項1記載の遺伝子改変微生物。
- 前記配列番号212のアミノ酸配列において、N末端側から13番目のアミノ酸残基がフェニルアラニンまたはロイシンであり、N末端側から15番目のアミの酸残基がロイシンまたはグルタミンであり、N末端側から16番目のアミノ酸残基がリシンまたはアスパラギンであり、N末端側から17番目のアミノ酸残基がグリシンまたはセリンであり、N末端側から19番目のアミノ酸残基がプロリンまたはアルギニンであり、N末端側から21番目のアミノ酸残基が好ましくはロイシン、メチオニンまたはバリンである、請求項2記載の遺伝子改変微生物。
- Escherichia属、Serratia属、Hafnia属及びPseudomonas属からなる群から選ばれる微生物の遺伝子改変体である、請求項1~3のいずれか1項に記載の遺伝子改変微生物。
- アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力及び3-ヒドロキシアジピル-CoAから3-ヒドロキシアジピン酸を生成する能力を有する、請求項1~4のいずれか1項に記載の遺伝子改変微生物。
- アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力、3-ヒドロキシアジピル-CoAから2,3-デヒドロアジピル-CoAを生成する能力及び2,3-デヒドロアジピル-CoAからα-ヒドロムコン酸を生成する能力を有する、請求項1~4のいずれか1項に記載の遺伝子改変微生物。
- アセチル-CoA及びスクシニル-CoAから3-オキソアジピルCoA及び補酵素Aを生成する能力、3-ヒドロキシアジピル-CoAから2,3-デヒドロアジピル-CoAを生成する能力、2,3-デヒドロアジピル-CoAからアジピル-CoAを生成する能力及びアジピル-CoAからアジピン酸を生成する能力を有する、請求項1~4のいずれか1項に記載の遺伝子改変微生物。
- 請求項1~5のいずれかに記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、3-ヒドロキシアジピン酸の製造方法。
- 請求項1~4及び6のいずれか1項に記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、α-ヒドロムコン酸の製造方法。
- 請求項1~4及び7のいずれか1項に記載の遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、アジピン酸の製造方法。
- Serratia属微生物において5-アミノレブリン酸シンターゼ遺伝子と遺伝子クラスターを構成する3-ヒドロキシブチリル-CoAデヒドロゲナーゼ遺伝子にコードされるポリペプチドをコードする核酸を導入または当該ポリペプチドの発現を増強した遺伝子改変微生物を、炭素源を発酵原料として含む培地にて培養することを含む、3-ヒドロキシアジピン酸、α-ヒドロムコン酸及びアジピン酸からなる群から選ばれる1つ以上の物質の製造方法。
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US20200291435A1 (en) | 2020-09-17 |
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