WO2017150560A1 - ヒドロキシニトリルリアーゼ - Google Patents
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Definitions
- the present invention relates to a method for cloning millipede-derived hydroxynitrile lyase (HNL) genes, enzymes produced by expression of these genes, and a method for producing optically active cyanohydrins using the expressed enzymes.
- HNL millipede-derived hydroxynitrile lyase
- Optically active cyanohydrin is an important intermediate in the production of pharmaceuticals and fine chemicals.
- a method for producing cyanohydrin a method in which a hydroxynitrile lyase is allowed to act on an aldehyde or ketone and a cyanide donor has been proposed (Patent Document 1).
- (R) -Hydroxynitrile lyase found from Yanbarto Sakayase has higher specific activity and better stability to heat and pH than hydroxynitrile lyase found from plants (patented) Document 2, Non-Patent Document 1).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-217590
- Patent Document 2 Japanese Unexamined Patent Publication No. 2015-167477
- Non-Patent Document 1 Dashimapur et al., Proc. Natl. Acad. Sci. USA. 112, 10605-10610 (2015)
- Patent Document 2 (R) -hydroxynitrile lyase found from Yanbartosaka Yasude is expressed in yeast, but its expression level is very small, and no expression system in E. coli has been constructed. Preparation was difficult.
- HNL hydroxynitrile lyase
- the present invention can provide (provide) HNL genes and HNLs derived from millipedes other than Yanbartosaka millipede, and further establish an expression system for the obtained HNL to provide a practically usable amount of HNL.
- the purpose is to provide a method.
- Another object of the present invention is to provide a method for producing an optically active cyanohydrin using the provided HNL.
- HNL genes can be cloned from various millipedes by using degenerate primers of specific sequences from sequences conserved among millipede-derived HNL genes.
- HNL gene and HNL were obtained from Japanese millipede.
- insect culture cells and specific E. coli a newly found HNL gene can be expressed and HNL can be produced.
- optically active cyanohydrins can be produced using the expressed HNL, thereby completing the present invention.
- the present invention is as follows.
- HNL millipede-derived hydroxynitrile lyase
- a method comprising selecting a gene having at least one of a base sequence encoding and a base sequence encoding VPNGKIH (SEQ ID NO: 16).
- the selection of the gene is performed by performing PCR using a gene present in an organism belonging to the millipede network as a template and using at least one DNA consisting of a base sequence encoding the conserved amino acid sequence as a primer [1 ] Method.
- the selection of the gene is carried out by performing DNA-DNA hybridization using a gene present in an organism belonging to the millipede network as a template and using a DNA comprising a base sequence encoding the conserved amino acid sequence as a probe. The method according to [1].
- the selection of the gene is performed by sequencing a gene present in an organism belonging to the millipede net and selecting a gene having a base sequence encoding the conserved amino acid sequence from the sequenced gene sequences.
- the gene present in the organism belonging to the millipede is a genomic DNA extracted from the organism belonging to the millipede or a cDNA obtained by reverse transcription from RNA extracted from the organism belonging to the millipede.
- HNL-FW CTGCAACTGCATTGGAMATTCAAGG (SEQ ID NO: 21), HNL-RV: ATGAATCTTRTCRCCGGTTGGAAC (SEQ ID NO: 22) HNL-FW2: SSAACTGCATTGGAYATMMRAGG (SEQ ID NO: 23) HNL-RV2: ATGAATCTTRTCRCCRTTTGGRAC (SEQ ID NO: 24) [7] The method according to any one of [1] to [6], wherein the organism belonging to the millipede net is a sea squirrel mosquito, a zelkova, a herabayasde, a kishayasude, a green baysade, or an amabikosude.
- a method for producing millipede-derived HNL, A millipede-derived HNL gene is prepared by the method according to any one of [1] to [7], The said method including expressing the gene of HNL obtained in a host cell, and obtaining HNL.
- the host cell is The method according to [8], which is an insect cultured cell.
- the host cell is The method according to [8], which is Escherichia coli having disulfide bond isomerase expression ability.
- [12] A plasmid comprising the gene according to [11] in a vector.
- [13] A transformant comprising a host capable of expressing a plasmid containing the gene according to [11] in a vector, wherein the host is an insect culture cell or Escherichia coli having disulfide bond isomerase expression ability. body.
- [14] A method for producing millipede-derived HNL, [13] A method for producing HNL, comprising culturing the transformant according to [13] and separating HNL from the culture.
- [15] [14] The method according to [14], wherein the host is an insect cultured cell, and the HNL gene is an HNL gene derived from a sea squirrel mosquito, a zelkova, a Herababayasde, a Kisha Yasude, a green bay sedge, or an Amabiko Yasude.
- [16] [14] The method according to [14], wherein the host is Escherichia coli having a disulfide bond isomerase expression ability, and the HNL gene is a gene of HNL derived from a sea squirrel mosquito, a zelkova, or a cricket.
- the HNL gene can be cloned from various millipedes.
- millipede-derived (R) -HNL having high specific activity and heat stability can be easily prepared using insect cultured cells or specific genetically modified Escherichia coli, and can be used for the production of optically active cyanohydrins. Since optically active cyanohydrin is an important intermediate in the production of pharmaceuticals and fine chemicals, the present invention is very useful industrially.
- FIG. 1 shows the result of SDS-PAGE analysis of NttHNL purified from Tamba red millipede.
- Lane 1 is “Broad Range Marker” (manufactured by Bio-Rad)
- Lane 2 is purified HNL (NttHNL).
- FIG. 2 is a diagram showing the effects of heat and pH on OgraHNL purified from E. coli. A is the optimum temperature, B is the optimum pH, C is the thermal stability, and D is the pH stability.
- FIG. 3 shows the influence of heat and pH on NtmHNL purified from E. coli. A is the optimum temperature and B is the optimum pH.
- NttHNL protein SEQ ID NO: 1
- SEQ ID NO: 2 The amino acid sequence of NttHNL protein (SEQ ID NO: 2)
- the amino acid sequence of NtmHNL protein SEQ ID NO: 3
- the nucleotide sequence of NtmHNL gene SEQ ID NO: 4
- the amino acid sequence of OgraHNL protein SEQ ID NO: 5
- the base sequence of OgraHNL gene SEQ ID NO: 6
- PfalHNL protein SEQ ID NO: 7
- SEQ ID NO: 8 The amino acid sequence of PfalHNL protein (SEQ ID NO: 8) are shown.
- the amino acid sequence of the Pton1HNL protein (SEQ ID NO: 9) and the base sequence of the Pton1HNL gene (SEQ ID NO: 10) are shown.
- the amino acid sequence of PlumHNL protein (SEQ ID NO: 11) and the base sequence of PlumHNL gene (SEQ ID NO: 12) are shown.
- the amino acid sequence of RspHNL protein (SEQ ID NO: 13) and the base sequence of RspHNL gene (SEQ ID NO: 14) are shown.
- the examination result of the optimal temperature of Pton3HNL is shown.
- the examination result of the optimum pH of Pton3HNL is shown.
- the examination result of the temperature stability of Pton3HNL is shown.
- the examination result of pH stability of Pton3HNL is shown.
- the production result (pH dependence) of (R) -mandelonitrile in Example 14 is shown.
- the production result (concentration dependence) of (R) -mandelonitrile in Example 14 is shown.
- the amino acid sequence of PtokHNL protein (SEQ ID NO: 83) and the base sequence of PtokHNL gene (SEQ ID NO: 84) are shown.
- the amino acid sequence (sequence number 85) of Pton2HNL protein and the base sequence (sequence number 86) of Pton2HNL gene are shown.
- the amino acid sequence (sequence number 87) of Pton3HNL protein and the base sequence (sequence number 88) of Pton3HNL gene are shown.
- the amino acid sequence of the RssHNL protein (SEQ ID NO: 89) and the base sequence of the RssHNL gene (SEQ ID NO: 90) are shown.
- the present invention relates to a method for producing a millipede-derived hydroxynitrile lyase (HNL) gene.
- a conserved amino acid sequence TAX 1 DIX 2 G (SEQ ID NO: 15) of a millipede-derived HNL is obtained from a gene present in an organism belonging to the millipede network (where X 1 is L or F, and X 2 is R or K And a gene having at least one of the base sequence encoding VPNGKIH (SEQ ID NO: 16).
- TALDIRG (SEQ ID NO: 17) TALDIKG (SEQ ID NO: 18) TAFDIRG (SEQ ID NO: 19) TAFDIKG (SEQ ID NO: 20)
- the conserved amino acid sequence of millipede-derived HNL of SEQ ID NO: 16 is VPNGDKIH.
- the base sequence encoding the conserved amino acid sequence is not limited.
- degenerate primers HNL-FW (SEQ ID NO: 21) and HNL-RV (SEQ ID NO: 22) described later, and degenerate primer HNL-FW2 (SEQ ID NO: 23) are used.
- HNL-RV SEQ ID NO: 24.
- the HNL gene can be cloned from various millipedes for the first time by using a primer (degenerate primer) having a base sequence encoding a conserved amino acid sequence.
- HNL genes are cloned from various millipedes using degenerate primers as described above.
- the present invention has at least one of base sequences encoding conserved amino acid sequences of millipede-derived HNL. Any method that includes selecting a gene is included. Examples of such a method include the following methods (1) to (3). (1) The selection of the gene is performed by performing PCR using a gene present in an organism belonging to the millipede as a template and at least one DNA consisting of a base sequence encoding the conserved amino acid sequence as a primer. Method.
- the selection of the gene is carried out by DNA-DNA hybridization using a gene present in an organism belonging to the millipede network as a template and DNA comprising a base sequence encoding the conserved amino acid sequence as a probe. How to be. (3) The selection of the gene involves sequencing a gene present in an organism belonging to the millipede net, and selecting a gene having a base sequence encoding the conserved amino acid sequence from the sequenced gene sequences. The method implemented by.
- the gene present in the organism belonging to the millipede network used in the method of the present invention is, for example, genomic DNA extracted from the organism belonging to the millipede network, or cDNA obtained by reverse transcription from RNA extracted from the organism belonging to the millipede network. be able to.
- a method for extracting genomic DNA and a method for preparing cDNA from RNA by reverse transcription known methods can be used as appropriate.
- the gene present in the organism belonging to the millipede network used as a template can be the genomic DNA or cDNA extracted as described above, preferably cDNA, and using these DNAs as templates and represented by SEQ ID NOs: 15 and 16 above.
- PCR is performed using at least one DNA consisting of a base sequence encoding a conserved amino acid sequence as a primer.
- the base sequence of the primer is not limited as long as it encodes the conserved amino acid sequence shown in SEQ ID NOs: 15 and 16.
- PCR can be performed using these degenerate primers to amplify the HNL gene derived from the organism.
- HNL-FW CTGCAACTGCATTGGAMATTCAAGG (SEQ ID NO: 21), HNL-RV: ATGAATCTTRTCRCCGGTTGGAAC (SEQ ID NO: 22) HNL-FW2: SSAACTGCATTGGAYATMMRAGG (SEQ ID NO: 23) HNL-RV2: ATGAATCTTRTCRCCRTTTGGRAC (SEQ ID NO: 24)
- the gene present in the organism belonging to the millipede network used as a template can be the genomic DNA or cDNA extracted as described above, preferably the extracted genomic DNA, and using these DNAs as templates, the SEQ ID NO: 15 and DNA-DNA hybridization is carried out using at least one DNA consisting of a base sequence encoding the conserved amino acid sequence represented by 16 as a probe.
- a known method can be used as appropriate.
- the base sequence of the probe is not limited as long as it encodes the conserved amino acid sequence represented by SEQ ID NOs: 15 and 16.
- the same base sequence as the degenerate primers HNL-FW and HNL-RV or It can be a base sequence containing a part of these base sequences.
- DNA-DNA hybridization is performed to obtain an HNL gene derived from the organism.
- the HNL gene obtained by DNA-DNA hybridization can be appropriately amplified by a known amplification method such as PCR.
- Method (3) Sequencing of genes present in organisms belonging to the millipede net.
- the subject to be sequenced can be genomic DNA or cDNA extracted as described above.
- a known method can be appropriately used as the sequencing method.
- a gene having a base sequence encoding the conserved amino acid sequence is selected from the sequenced gene sequences.
- organisms belonging to the millipede family There is no limitation on organisms belonging to the millipede family. Examples of the organism belonging to the millipede net include Obiyasude of the Obiyasude Obiyasude family, Hagayasude of the Obiyasudee deer family, and Obiyasudee family Chibiyasude. In the Examples, it is shown that the HNL genes of Echinoptera spp.
- the cDNA preparation method and the PCR method using cDNA as a template are known methods. Referring to the description of the examples, the above-described HNL-FW and HNL-RV can be used as degenerate primers.
- the present invention relates to a gene having any one of the following base sequences (4) to (6).
- (4) a base sequence encoding a protein having the base sequence described in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 84, 86, 88 or 90 of the sequence listing and having HNL activity; (5) Deletion, substitution and / or addition of 1 to 50 bases in the base sequence described in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 84, 86, 88 or 90 in the sequence listing Or a base sequence encoding a protein having HNL activity; or (6) in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 84, 86, 88 or 90 of the sequence listing
- the genes having the nucleotide sequences set forth in SEQ ID NOs: 2, 4, 6, 8, 10, 12, 14, 84, 86, 88 and 90 in the sequence table of (4) are respectively, Tamba aka Yasude, Umaga Esia kayade, Yake Yasude.
- These are HNL genes derived from Herababa Yasude, Midribaba Yasude, Kisha Yasude, a kind of Amabiko Yasude, Parafontaria entokaiensis, Midribaba Yasude, Midribaba Yasude, and Amabiko Yasude.
- the range of “1 to 50” in the “base sequence having deletion, substitution and / or addition of 1 to 50 bases” referred to in the present specification is not particularly limited, but for example, preferably 1 to 40 bases More preferably, it means 1 to 30, more preferably 1 to 20, more preferably 1 to 10, still more preferably 1 to 5, particularly preferably about 1 to 3.
- SEQ ID NOs: 2, 4, 6, 8, 10, 12, 14, Based on the information of the nucleotide sequence described in 84, 86, 88 or 90, it can be prepared by any method known to those skilled in the art such as chemical synthesis, genetic engineering techniques or mutagenesis.
- a method in which a DNA having the base sequence described in SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 84, 86, 88 or 90 in the sequence listing is contacted with a mutagen agent, It can be prepared using a method of irradiating ultraviolet rays, a genetic engineering method, or the like.
- Site-directed mutagenesis which is one of the genetic engineering methods, is useful because it can introduce a specific mutation at a specific position.
- Molecular cloning 2nd edition Current Protocols in Molecular. It can be performed according to the method described in biology and the like.
- hybridizes under stringent conditions means a DNA base sequence obtained by using a DNA as a probe and using a colony hybridization method, a plaque hybridization method, a Southern blot hybridization method, or the like.
- a DNA base sequence obtained by using a DNA as a probe and using a colony hybridization method, a plaque hybridization method, a Southern blot hybridization method, or the like.
- hybridization at 65 ° C. in the presence of 0.7 to 1.0 M NaCl using a filter on which DNA derived from colonies or plaques or a fragment of the DNA is immobilized 0.
- Examples thereof include DNA that can be identified by washing a filter at 65 ° C. using a 1 to 2 ⁇ SSC solution (1 ⁇ SSC solution is 150 mM sodium chloride, 15 mM sodium citrate).
- Hybridization can be performed according to the method described in Molecular Cloning 2nd edition.
- DNA that hybridizes under stringent conditions include DNA having a certain degree of identity with the base sequence of DNA used as a probe, for example, 90% or more, preferably 93% or more, more preferably 95%. More preferably, DNA having identity of 98% or more, most preferably 99% or more is mentioned.
- the method for obtaining the gene of the present invention is not particularly limited, but preferably there is a method for producing the HNL gene of the present invention.
- the present invention includes a plasmid containing the gene of the present invention in a vector. Furthermore, the present invention includes a transformant containing the plasmid of the present invention in a host organism so that the HNL encoded by the gene of the present invention can be expressed. Examples of the host organism include insect cultured cells and Escherichia coli having disulfide bond isomerase expression ability.
- the type of vector used in the present invention is not particularly limited.
- the vector may be a self-replicating vector (for example, a plasmid), or may be integrated into the host cell genome when introduced into the host cell. It may be replicated together with other chromosomes.
- the vector is an expression vector.
- elements necessary for transcription for example, a promoter and the like
- a promoter is a DNA sequence that exhibits transcriptional activity in a host cell, and can be appropriately selected depending on the type of host. That is, the vector used for the plasmid of the present invention is not particularly limited as long as it can express the HNL gene of the present invention in a host organism. Examples of such expression vectors include pFastbac1, BacPAK6, pIEx-1, and pBiEx-1 in the case of insect cultured cells.
- promoters operable in insect cells include polyhedrin promoter, P10 promoter, autographa caliornica polyhedrosic basic protein promoter, baculovirus immediate early gene 1 promoter, or baculovirus 39K delayed early gene. There are promoters.
- examples of expression vectors include pUC19 (manufactured by Takara Bio Inc.), pBluescript, pET28, pCDF, pRSF, and the like.
- examples of a promoter operable in E. coli include, for example, a lac, trp or tac promoter.
- the present invention includes a method for producing millipede-derived HNL.
- Millipede-derived HNL production method (1) comprises preparing a millipede-derived HNL gene by the method of the present invention, and expressing the obtained HNL gene using insect cultured cells as a host to obtain HNL. It is the method of including.
- Millipede-derived HNL production method (2) includes preparing a millipede-derived HNL gene by the method of the present invention, expressing the obtained HNL gene using Escherichia coli as a host, and obtaining HNL.
- the E. coli is E. coli having disulfide bond isomerase expression ability.
- Millipede-derived HNL production method (3) is a method for producing HNL, comprising culturing the transformant of the present invention and separating HNL from the culture.
- the host is an insect cultured cell
- the HNL gene is an HNL gene derived from the sea squirrel mosquito, the zelkova, the king moth, the green lily, or the amobiko pearl And (3-2) a method in which the host is Escherichia coli having the ability to express disulfide bond isomerase, and the HNL gene is a gene of HNL derived from a marine mosquito, a zelkova, or a blackshade.
- Millipede-derived HNL production method (3-1) is to obtain HNL by expressing an HNL gene derived from insect cultivated cells as a host, using the HNL gene derived from the sea squirrel mosquito, japonicus, herababayashide, kishayasude, greenbayape, or amobikosade It is a method including.
- Millipede-derived HNL production method (3-2) comprises expressing HNL gene derived from E. coli scallop, zelkova or Kisha Yasude using Escherichia coli as a host to obtain HNL, wherein said Escherichia coli is disulfide-linked isomerase This method is E. coli having expression ability.
- recombinant gene transfer vectors and baculoviruses are co-introduced into insect cells using known methods, After obtaining the recombinant virus, the insect cells can be further infected with the recombinant virus to express the protein.
- the baculovirus for example, Autographa californica nuclear polyhedrosis virus, which is a virus that infects Coleoptera insects, can be used.
- Insect cells include Sf9 and Sf21 [Baculovirus Expression Vectors, A Laboratory Manual, WH Freeman & Company (W. H. Freeman and Company), New York (Spodoptera frugiperda ovary cells). New York), (1992)], HiFive (manufactured by Invitrogen), which is an ovary cell of Trichoplusia ni, and the like can be used.
- Examples of the method for co-introducing a recombinant gene introduction vector into insect cells and the baculovirus for preparing a recombinant virus include the calcium phosphate method and the lipofection method.
- E. coli having the ability to express disulfide bond isomerase and E. coli having mutations in thioredoxin reductase and glutathione reductase are used.
- E. coli having the ability to express disulfide bond isomerase include SHuffleSHT7 used in the Examples.
- E. coli having mutations in thioredoxin reductase and glutathione reductase include Origami and Rosetta-gami series E. coli strains (manufactured by Merck Millipore).
- the transformation of E. coli may be performed, for example, by using competent cells by a protoplast method or a known method.
- the above transformant is cultured in an appropriate nutrient medium under conditions that allow expression of the introduced gene.
- ordinary protein isolation and purification methods may be used. For example, when HNL is expressed in a dissolved state in a cell, after completion of the culture, the cell is collected by centrifugation, suspended in an aqueous buffer solution, disrupted by an ultrasonic crusher, etc., and cell-free extraction Obtain a liquid.
- an ordinary protein isolation and purification method that is, a solvent extraction method, a salting-out method using ammonium sulfate, a desalting method, a precipitation method using an organic solvent, Anion exchange chromatography using resin such as diethylaminoethyl (DEAE) Sepharose, cation exchange chromatography using resin such as S-Sepharose FF (Pharmacia), resin such as butyl sepharose and phenyl sepharose Purify HNL using methods such as hydrophobic chromatography, gel filtration using molecular sieves, affinity chromatography, chromatofocusing, and electrophoresis such as isoelectric focusing alone or in combination. Can be obtained as
- the present invention relates to a protein having an amino acid sequence of any one of (1) to (3) below and having HNL activity.
- Proteins having the amino acid sequences set forth in SEQ ID NOs: 1, 3, 5, 7, 9, 11, 13, 83, 85, 87 and 89 in the sequence listing of (1) are respectively Tamba aka Yasude, Umaga Esia kayade, Yake Yasude. HNL derived from Parafontaria spp., Paramecium spp., Paramecium spp., Parasitella spp.
- the proteins having the amino acid sequences set forth in SEQ ID NOs: 9, 85 and 87 are all HNL derived from Midribaba Yasude, but the collection sites are different.
- the method for measuring the HNL activity of the protein having HNL activity of the present invention is described in “Method for measuring (R) -mandelonitrile synthesis activity” shown in the Examples.
- the second of the protein of the present invention is a protein having an amino acid sequence having a deletion, substitution and / or addition of 1 to 50 amino acids in the amino acid sequence described in SEQ ID NO: 1 in the Sequence Listing.
- the range of “1 to 50” in the “amino acid sequence having 1 to 50 amino acid deletions, substitutions and / or additions” mentioned here is a protein having a deletion or the like having an HNL activity. Means that.
- the range of “1 to 50” is, for example, 1 to 40, preferably 1 to 30, more preferably 1 to 20, more preferably, from the viewpoint that the ratio of the protein having the HNL activity is high. 1 to 10, more preferably 1 to 7, even more preferably 1 to 5, and particularly preferably about 1 to 3.
- the (3) of the protein of the present invention is a protein having an amino acid sequence having 90% or more identity to the amino acid sequence described in SEQ ID NO: 1 in the Sequence Listing.
- the identity in the “amino acid sequence having 90% or more identity to the amino acid sequence described in SEQ ID NO: 2 in the Sequence Listing” is as follows.
- the protein having the identity of the amino acid sequence has the HNL activity. As long as it is an enzyme, it is not particularly limited.
- the identity of the amino acid sequence is not particularly limited as long as it is 90% or more, but is preferably 95% or more, more preferably 96% or more, further preferably 97% or more, more preferably 98%, and particularly preferably 99%. That's it.
- the method for obtaining a protein having HNL activity of the present invention is not particularly limited, and may be a protein synthesized by chemical synthesis or a recombinant protein produced by a gene recombination technique.
- the protein having the HNL activity of the present invention is obtained by mounting a gene encoding the protein having the HNL activity on a vector, transforming a host cell with this vector, culturing the transformed host cell, The protein encoded by the gene can be accumulated therein, and the accumulated protein can be collected by a production method.
- Examples of the method for obtaining a gene encoding a protein having HNL activity include the aforementioned method of the present invention.
- the method for preparing the protein of the present invention can be, for example, a method for producing the above-mentioned millipede-derived HNL of the present invention.
- the present invention includes a method for producing an optically active cyanohydrin. This method comprises preparing an optically active cyanohydrin that causes a millipede-derived HNL to act on a reaction solvent containing an aldehyde or ketone and hydrogen cyanide or a substance that generates cyanide ions in the reaction system.
- Millipede-derived HNL is the protein having the HNL activity of the present invention or the transformant of the present invention.
- the protein having HNL activity of the present invention may be a crude enzyme or a purified enzyme.
- the transformant of the present invention may be a microbial cell itself or a crushed product of the microbial cell.
- millipede-derived HNL is a protein having the HNL activity of the present invention or a transformant of the present invention.
- the aldehyde or ketone serving as a reaction substrate can be, for example, a compound represented by the formula (I) R 1 — (C ⁇ O) R 2 .
- R 1 and R 2 are (i) a hydrogen atom, (ii) a substituted or unsubstituted linear or branched saturated alkyl group having 1 to 18 carbon atoms, or (iii) a substituted group. Or, an unsubstituted ring is an aromatic group having 5 to 22 members. However, R 1 and R 2 do not represent a hydrogen atom at the same time.
- the substituent is one or more amino groups, imino groups, hydroxy groups, alkoxy groups having 1 to 8 carbon atoms, halogens, carboxyl groups , A cycloalkyl group having 3 to 20 carbon atoms, or an aromatic group having up to 22 carbon atoms that may be substituted with a heteroatom of N, O, or S (where the substituent is a cyclic substituent) Substituted by one or more halogens, hydroxy groups, linear or branched alkyl groups having 1 to 8 carbon atoms, linear or branched alkenyl groups having 2 to 8 carbon atoms May be.)
- the aromatic group may be a heteroaromatic group in which up to 4 ring members are substituted by N, O and / or S.
- R 1 and R 2 are substituted aromatic groups
- the substituents are one or more amino groups, imino groups, hydroxy groups, alkoxy groups having 1 to 8 carbon atoms, allyloxy groups, halogens, carboxyl groups.
- hydrogen cyanide is used as a raw material.
- a method of supplying hydrogen cyanide either a method of supplying as a liquid or a method of supplying as a gas can be employed.
- hydrocyanic acid that is, hydrocyanic acid
- any substance that generates cyanide ions (CN ⁇ ) when added to the reaction system can be used. Examples thereof include hydrogen cyanide salts such as sodium cyanide and potassium cyanide, and cyanohydrins such as acetone cyanohydrin. It is done.
- reaction solvent As a reaction solvent, when a large amount of water is present in the reaction system, racemization of the optically active cyanohydrin produced by the enzymatic reaction is likely to occur, or when an aldehyde or ketone having low solubility in water is used as a raw material, the production efficiency It is preferable to use a reaction solvent composed mainly of an organic solvent that is hardly soluble or insoluble in water, from the viewpoint of lowering the temperature. As such an organic solvent, any organic solvent that does not affect the synthesis reaction of the optically active cyanohydrin by an enzymatic reaction can be used without particular limitation. Physical properties of the raw material aldehyde or ketone used in the synthesis reaction, and the product cyanohydrin can be used.
- aliphatic or aromatic linear, branched or cyclic saturated or unsaturated hydrocarbon solvents which may be halogenated, such as pentane, hexane, toluene, xylene, methylene chloride, etc.
- An aliphatic or aromatic linear or branched or cyclic saturated or unsaturated alcohol solvent which may be halogenated, such as isopropyl alcohol, n-butanol, isobutanol, t-butanol, Hexanol, cyclohexanol, n-amyl alcohol, etc .; aliphatic or aromatic linear or branched or cyclic saturated or unsaturated ether solvents which may be halogenated, such as diethyl ether, dipropyl ether , Diisopropyl ether, dibutyl ether, methyl-t-butyl ether and the like; Aliphatic or aromatic linear or branched or cyclic saturated or unsaturated ester solvents, such as methyl formate, methyl acetate, ethyl acetate, butyl acetate, methyl propionate, etc. These may be used alone or in combination. These organic solvents may be saturated with an aqueous buffer solution
- the concentration of aldehyde or ketone in the reaction solvent is preferably in the range of 0.01 mM to 5 M.
- a recombinant microbial cell in an amount exhibiting an enzyme activity of 1 unit / mmol or more can be used.
- the enzyme activity of the bacterial cells is, for example, suspended by suspending the bacterial cells in water or a buffer solution, using a supernatant obtained by centrifugation, using DL-mandelonitrile as a substrate, and the substrate depending on the enzyme. It can be calculated by measuring the change in absorbance when it is decomposed to produce benzaldehyde at a wavelength of 249.6 nm.
- the pH of the reaction solvent does not need to be adjusted when the organic solvent is used without being saturated with an aqueous buffer, but when the organic solvent is saturated with an aqueous buffer, the pH of the aqueous buffer is 3-7. In the range of 3 to 6, preferably 3 to 6.
- the reaction temperature is preferably as low as possible within the range in which the enzyme activity is exerted in order to suppress the by-production of racemic cyanohydrin that does not depend on the enzyme reaction, and is usually 0 to 50 ° C., preferably 10 to 45 ° C.
- reaction solution and the bacterial cells are separated to obtain a reaction product solution.
- the target optically active cyanohydrin is obtained. Separation of products can be performed by commonly used means such as distillation separation, column chromatography separation, and extraction separation.
- a dehydrating agent or the like may be added for dehydration treatment, or a stabilizer or the like may be added.
- Example 1 Purification of HNL (NttHNL) from Tamba red squirrel A Tamba red squirrel, Nedyopus tambanus tambanus (Attems) was collected at Toyama Prefectural University. A crude enzyme solution was extracted from millipede, and NttHNL was purified as follows.
- NttHNL was adsorbed on ResourceQ and eluted with a NaCl concentration gradient. Thereafter, it was added to Superdex 75 10/300 GL (manufactured by GE Healthcare) and eluted with PBS.
- the purified NttHNL showed (R) -mandelonitrile synthesis activity, and its specific activity was 4700 U / mg.
- N-terminal amino acid sequence analysis and internal sequence analysis of purified NttHNL were performed.
- EEEPLTXDKL an N-terminal amino acid sequence, EEEP (I / L) TCDQ (I / L) PK, and (I / L) QTQAVEVAK were obtained.
- Example 2 Cloning of NttHNL gene
- Total RNA was extracted from Tamba akayase using TRIzol (Invitrogen), and cDNA was synthesized using Gene Racer Kit (Invitrogen).
- a degenerate primer was designed from the N-terminal amino acid sequence of NttHNL and the internal sequence, and a partial sequence of cDNA encoding NttHNL was amplified by PCR.
- the amplified DNA was connected to pCR-blunt (Invitrogen), and the base sequence of the insert was determined. Subsequently, 5′- and 3′-RACE were performed using primers designed from the internal sequence to determine the full-length base sequence of the cDNA encoding NttHNL.
- NttHNL-F1 GTTCCAGTTCCTCCGTTAGAAGATTTT (SEQ ID NO: 27)
- NttHNL-F2 CCCAGCTGCAACTGCATTGGACATT
- NttHNL-R1 CTCTGCAATTGCAGAACCATTGCACCGTA
- SEQ ID NO: 29 NttHNL-R1: CCATTTGGGGTGTTCAAATTTAGTAATT (SEQ ID NO: 30)
- NttHNL-FW ATGCTGTTTTACGTTTCGATTCTTCTAG (SEQ ID NO: 31)
- NttHNL-RV TTAATAGAAAAGCAAACACACATGGTG (SEQ ID NO: 32)
- Example 3 Homology Cloning of Millipede-derived Hydroxynitrile Lyase Gene (P. laminata (Attems)), P. tominomine Attems, and one species of Amabiko millipede (Ruukiria sp.), Each from one individual, total RNA was prepared by the method described above, Gene Racer Kit or SMART RACE Combine cDNA using cDNA Amplification Kit (Clontech) Made. A partial sequence of each millipede-derived HNL gene was amplified by PCR using degenerate primers designed from homologous sequences of ChuaHNL and NttHNL. Degenerate primer sequence: HNL-FW: CTGCAACTGCATTGGAMATTCAAGG (SEQ ID NO: 17), HNL-RV: ATGAATCTTRTCRCCGGTTGGAAC (SEQ ID NO: 18)
- NtmHNL-F1 TGGTGGACCTAATAACTCCGCCATA (SEQ ID NO: 33)
- NtmHNL-F2 CCCAGATGGAAGTTCATATTGCCGCTTA (SEQ ID NO: 34)
- NtmHNL-R1 GAGTGGGTCCGGTTCCATTGTTATTAT (SEQ ID NO: 35)
- NtmHNL-R2 GCCATTGCACGTATAAGCGCAATAT (SEQ ID NO: 36)
- OgraHNL-F1 CGTTGGTGGTCTCATAATATCTCAGCTAT (SEQ ID NO: 37)
- OgraHNL-F2 CACCAATCTGAACACTCCAAATGGAA, (SEQ ID NO: 38)
- OgraHNL-R1 GGATCGGTTCCGTTGTTGTT
- NtmHNL-FW ATGCTGTTTTACGTCCTGATTCTTC (SEQ ID NO: 57), NtmHNL-RV: TCAATAGAAAGCAAAAAGCCATCATGG (SEQ ID NO: 58), OgraHNL-FW: ATGTTTTACTACGTTTCAAACTACT (SEQ ID NO: 59), OgraHNL-RV: CTAATAGAAAAGCAAAACAGCCATGG (SEQ ID NO: 60), PfalHNL-FW: ATGACTTCGATCATTCTCCACG (SEQ ID NO: 61), PfalHNL-RV: TTAGTAATAGAGAGGGACAGAAAGGG (SEQ ID NO: 62), PlumHNL-FW: ATGACTTCGATCATTCTCCTCATGACTG (SEQ ID NO: 63), PlumHNL-RV: GCTTAATTCAATTGCACTTTATTTTTATATC (SEQ ID NO: 64), Pton1HNL-FW: ATGACTTCAATC
- Pton2HNL Midribabayase-derived hydroxynitrile lyase
- Pton3HNL Midribabayase-derived hydroxynitrile lyase
- RssHNL Amibiko millipede-derived hydroxynitrile lyase
- the respective amino acid sequences are shown in SEQ ID NOs: 1, 3, 5, 7, 9, 11, 13, 83, 85, 87, and 89.
- the base sequences of the respective genes are shown in SEQ ID NOs: 2, 4, 6, 8, 10, 12, 1484, 86, 88, and 90.
- the homology of each amino acid sequence is summarized in Table 1. This method revealed that a gene encoding a millipede-derived hydroxynitrile lyase having 41% or more homology with ChuaHNL can be cloned.
- Example 4 Cloning of ChuaHNL gene
- Total RNA was prepared from Yanvaltosaka Yasude by the method shown in Example 3, and cDNA was synthesized.
- a region encoding ChuaHNL was amplified using primers and ligated into pCR-blunt.
- ChuaHNL-RV aagctttAGTAAAAAAGCAAAGCAACCGTGGGTTTCG (SEQ ID NO: 70)
- Example 5 Expression of hydroxynitrile lyase gene in insect cultured cells
- the above-mentioned millipede-derived hydroxynitrile lyase gene was expressed using a baculovirus-insect cell expression system.
- the insert DNA was prepared by PCR using each plasmid DNA obtained in Examples 2, 3 and 4 as a template and various primers and Tks Gflex DNA polymerase.
- IFSf-NttHNL-FW gggcgcggatccATGCTGTTTTACGTTTGATTC
- IFSf-NttHNL-RV acttctcgacaagctttTATAGAGAAAGCAAAACAACCCATGG
- IFSf-NtmHNL-FW catcggggcgcggatccATGCTGTTTTACGTTTCGATTCTTC
- IFSf-NtmHNL-RV actctcgacaagcttTCAATAGAAAGCAAAACAGCCCATGG
- IFSf-OgraHNL-FW catcggggcgcggatccATGTTGTACTACGTTTCAATAC
- IFSf-OgraHNL-RV actctcgacaagctttCTAATA
- the insert DNA was connected to the BamHI-HindIII site of pFastbac1 vector (Invitrogen) using In-Fusion HD cloning kit (Takara Bio). Further, a sequence encoding a His tag was introduced directly under the signal peptide cleavage site of each hydroxynitrile lyase using KOD-Plus-Mutageness Kit (Toyobo Co., Ltd.). The signal peptide cleavage site was predicted using SignalP (Nature Methods, 8: 785-786, 2011). Thereafter, the sequence of the insert was sequenced to confirm that there was no mutation due to PCR.
- Each of the obtained plasmids was introduced into Escherichia coli DH10BAC, and recombinant bacmid DNA was extracted from the transformant using QIAGEN Plasmid Mini Kit (manufactured by Qiagen). Recombinant bacmid DNA was transfected into Sf9 cells using X-tremeGENE 9 DNA transfection reagent (Roche). Recombinant baculovirus was collected and again infected with Sf9 cells to amplify the recombinant baculovirus, and further infected with Sf9 cells to amplify the recombinant baculovirus.
- the titer of the recombinant baculovirus was calculated by comparing the sample with a baculovirus genomic DNA known in the titer by real-time PCR using the ee1 gene amplification primer (Biotechnol. Prog., 20: 354-360, 2004).
- the recombinant baculovirus DNA was prepared using NucleoSpin Virus (manufactured by Takara).
- Each millipede-derived HNL was secreted and expressed by infecting each recombinant baculovirus with Sf9 cells (1.5 ⁇ 10 6 cells / mL) at a multiplicity of infection of 1.
- Cells were removed by centrifugation 72 hours after infection with the recombinant baculovirus, and the culture supernatant was collected.
- the culture supernatant was diluted with an equal amount of 20 mM HEPES-NaOH (pH 8.0) and added to cComplete Histag Purification resin (Roche).
- Each HNL adsorbed on the carrier was eluted with 10 mM HEPES-NaOH (pH 8.0) containing 0.1 M imidazole and 0.1 M NaCl.
- the protein concentration was measured using TaKaRa BCA Protein Assay Kit (manufactured by Takara) using fetal bovine serum-derived albumin as a standard. Each hydroxynitrile lyase showed (R) -mandelonitrile synthesis activity. See Table 2a.
- Example 6 Expression of millipede-derived hydroxynitrile lyase gene in E. coli ChuaHNL, NttHNL, NtmHNL, OgraHNL, PfalHNL, PtonHNL, PtonHNL, PtamHNL, PtonHNL, PtamHNL, PtamHNL, PtamHNL, PtamHNL , Pton3HNL, RssHNL gene expression was tried.
- PCR was carried out using each plasmid DNA obtained in Example 3 as a template and various primers and Tks Gflex DNA polymerase.
- the insert DNA was ligated to the NdeI-HindIII site of the pET28 vector (Clontech) using an In-Fusion HD cloning kit (Takara Bio) so that it could be expressed as a His tag fusion protein.
- PlamHNL was connected to the BamHI-HindIII site of the pET28 vector. Thereafter, the sequence of the insert was sequenced to confirm that there was no mutation due to PCR.
- Each obtained plasmid was introduced into Escherichia coli BL21 (DE3) or SHuffle T7 (manufactured by New England Biolabs).
- the transformant was cultured in an LB medium containing kanamycin at 30 ° C. for 16 hours, transferred to a TB autoinduction medium, and cultured at 26 ° C. for 24 hours. After collection, the cells were disrupted by ultrasonic waves, and insoluble substances were precipitated by centrifugation to obtain a cell-free extract.
- the expression of the hydroxynitrile lyase gene was evaluated by the degradation activity of mandelonitrile. That is, the cell-free extract was added to 0.1 M citrate buffer containing 2 mM (R, S) -mandelonitrile, and the formation of benzaldehyde was monitored at 280 nm.
- E. coli BL21 (DE3), no expression of any hydroxynitrile lyase gene was observed. However, in E. coli SHuffle T7, expression of NtmHNL, OgraHNL, Pton2HNL, Pton3HNL and PlamHNL genes was observed (see Table 2a).
- Example 7 Purification of OgraHNL OgraHNL was purified as follows. The cell-free extract prepared by the method of Example 6 was added to HisTrap HP (manufactured by GE Healthcare). OgraHNL was eluted with an imidazole concentration gradient (20-500 mM). The fraction from which OgraHNL was eluted was collected and added to ResourceQ (manufactured by GE Healthcare). OgraHNL was eluted with a sodium chloride concentration gradient (0-300 mM). The fraction from which OgraHNL was eluted was collected and concentrated using an Amicon Ultra-4 centrifugal filter unit (Millipore).
- the purified OgraHNL showed (R) -mandelonitrile synthesis activity, and its specific activity, 1779 U / mg, was almost identical to the specific activity of OgraHNL expressed in insect cultured cells, 2225 U / mg (see Table 2a).
- Example 8 Effect of temperature and pH on OgraHNL
- Optimal temperature and temperature stability The optimal temperature and temperature stability of OgraHNL were examined. The enzyme reaction was carried out at 200 ⁇ l of a reaction solution containing 0.4 U OgraHNL, 300 mM citrate buffer (pH 4.2), 50 mM benzaldehyde, 100 mM KCN at each temperature for 5 minutes.
- (R) -mandelonitrile was quantified using HPLC, and the measurement results are shown in FIG. 2-A. The optimum temperature for OgraHNL was estimated to be 35 ° C.
- Example 9 Purification of NtmHNL NtmHNL was purified as follows. The cell-free extract prepared by the method of Example 6 was added to HisTrap HP (manufactured by GE Healthcare). NtmHNL was eluted with an imidazole concentration gradient (20-500 mM). The fraction from which NtmHNL was eluted was collected and added to ResourceQ (manufactured by GE Healthcare). NtmHNL was eluted with a sodium chloride concentration gradient (0-300 mM). The purification steps are summarized in Table 3. The purified NtmHNL showed (R) -mandelonitrile synthesis activity, and its specific activity was 1016 U / mg.
- Example 10 Effect of temperature and pH on NtmHNL
- a Optimum temperature and temperature stability The optimum temperature and temperature stability of NtmHNL were examined. The enzyme reaction was carried out at 200 ⁇ l of a reaction solution containing 0.4 U of NtmHNL, 300 mM citrate buffer (pH 4.2), 50 mM benzaldehyde, 100 mM KCN at each temperature for 5 minutes.
- R -mandelonitrile was quantified using HPLC, and the measurement results are shown in FIG. 3-A. The optimum temperature for NtmHNL was estimated to be 30 ° C.
- Example 11 Purification of PlumHNL Purification of PlamHNL was performed as follows. The cell-free extract prepared by the method of Example 6 was added to Ni Sepharose 6 FastFlow (GE Healthcare). PlumHNL was eluted with 20 mM KPB (pH 8.0) containing 100 mM imidazole and 500 mM sodium chloride. The purified PlumHNL showed (R) -mandelonitrile synthesis activity, and its specific activity was 1156 U / mg.
- Example 12 Purification of Pton3HNL from recombinant E. coli Purification of Pton3HNL was performed as follows. The cell-free extract prepared by the method of Example 6 was applied to HisTrap HP (manufactured by GE Healthcare) and eluted with an imidazole concentration gradient (20-500 mM). The fraction from which Pton3HNL was eluted was collected, then applied to ResourceQ (manufactured by GE Healthcare), and eluted with a sodium chloride concentration gradient (0-300 mM). The fraction from which Pton3HNL was eluted was collected and used as a purified enzyme.
- HisTrap HP manufactured by GE Healthcare
- ResourceQ manufactured by GE Healthcare
- the purified Pton3HNL showed (R) -mandelonitrile synthesis activity, and its specific activity was 2140 U / mg.
- Example 13 Effect of temperature and pH on Pton3HNL
- Optimum temperature and temperature stability The optimum temperature and temperature stability of Pton3HNL were examined. The enzyme reaction was carried out at 200 ⁇ l of a reaction solution containing 0.4 U of Pton3HNL, 300 mM citrate buffer (pH 4.2), 50 mM benzaldehyde, and 100 mM KCN at each temperature for 5 minutes.
- (R) -mandelonitrile was quantified using HPLC, and the measurement result is shown in FIG. 11a. The optimum temperature for Pton3HNL was estimated to be 30 °C.
- Example 14 Production of (R) -mandelonitrile using recombinant Escherichia coli Optically active cyanohydrin was synthesized by whole cell reaction in aqueous solution using E. coli Shuffle in which Pton3HNL was expressed. Bacteria were collected from 0.8 mL of the culture solution, suspended in 150 ⁇ L of 0.4 M citrate buffer (pH 3.0), 10 ⁇ L of 1 M benzaldehyde and 20 ⁇ L of 1 M KCN were added, and the mixture was incubated at 22 ° C. for 5 minutes. After extraction, the reaction product was analyzed by HPLC as described above and the enantiomeric excess (ee) was clarified.
- optically active cyanohydrins are important intermediates in the production of pharmaceuticals and fine chemicals
- the present invention is useful in fields related to the production of pharmaceuticals and fine chemicals.
- SEQ ID NO: 1 NttHNL protein SEQ ID NO: 2: NttHNL gene SEQ ID NO: 3: NtmHNL protein SEQ ID NO: 4: NtmHNL gene SEQ ID NO: 5: OgraHNL protein SEQ ID NO: 6: OgraHNL gene SEQ ID NO: 7: PfalHNL protein SEQ ID NO: 8: PfalHNL gene SEQ ID NO: 9: Pton1HNL protein SEQ ID NO: 10: Pton1HNL gene SEQ ID NO: 11: PlamHNL protein SEQ ID NO: 12: PlamHNL gene SEQ ID NO: 13: RspHNL protein SEQ ID NO: 14: RspHNL gene SEQ ID NO: 15: conserveed amino acid sequence of millipede-derived HNL SEQ ID NO: 16: Millipede Conserved amino acid sequence of derived HNL SEQ ID NO: 17: conserveed amino acid sequence of millipede-derived HNL SEQ ID NO: 18: conserveed amino
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Abstract
Description
関連出願の相互参照
本出願は、2016年3月1日出願の日本特願2016-038640号の優先権を主張し、その全記載は、ここに特に開示として援用される。
特許文献2:日本特開2015-167477号公報
本発明者らは、ヤスデ由来HNL遺伝子間で保存された配列から、特定の配列の縮重プライマーを用いることで、様々なヤスデからHNL遺伝子をクローニングすることができることを見出し、この方法により、様々なヤスデからHNL遺伝子及びHNLを得た。さらに、昆虫培養細胞及び特定の大腸菌を用いることで、新たに見出されたHNL遺伝子を発現させ、HNLを製造し得ることを見出した。加えて、発現させたHNLを用いて、光学活性シアノヒドリンを製造できることを見出して、本発明を完成した。
[1]
ヤスデ由来ヒドロキシニトリルリアーゼ(以下、HNL)遺伝子の製造方法であって、
ヤスデ網に属する生物に存在する遺伝子から、ヤスデ由来HNLの保存アミノ酸配列TAX1DIX2G(配列番号15)(但し、X1はL又はFであり、X2はR又はKである)をコードする塩基配列およびVPNGDKIH(配列番号16)をコードする塩基配列の少なくとも一方を有する遺伝子を選択することを含む方法。
[2]
前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなる少なくとも1つのDNAをプライマーとして用いてPCRを行うことにより実施される、[1]に記載の方法。
[3]
前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなるDNAをプローブとして用いて、DNA-DNAハイブリダイゼーションを行うことにより実施される、[1]に記載の方法。
[4]
前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子のシーケンシングを行い、シーケンシングされた遺伝子配列の中から、前記保存アミノ酸配列をコードする塩基配列を有する遺伝子を選択することにより実施される、[1]に記載の方法。
[5]
ヤスデ網に属する生物に存在する遺伝子が、ヤスデ網に属する生物より抽出したゲノムDNA、又は、ヤスデ網に属する生物より抽出したRNAより逆転写で得られるcDNAである[1]~[4]のいずれか1項に記載の方法。
[6]
前記プライマーが、下記の縮重プライマーHNL-FW及びHNL-RVである[2]に記載の方法。
HNL-FW:CTGCAACTGCATTGGAMATTCAAGG(配列番号21)、
HNL-RV:ATGAATCTTRTCRCCGTTTGGAAC(配列番号22)
HNL-FW2:SSAACTGCATTGGAYATMMRAGG(配列番号23)
HNL-RV2:ATGAATCTTRTCRCCRTTTGGRAC(配列番号24)
[7]
ヤスデ網に属する生物が、ウマガエシアカヤスデ、ヤケヤスデ、ヘラババヤスデ、キシャヤスデ、ミドリババヤスデ、またはアマビコヤスデである[1]~[6]のいずれか1項に記載の方法。
[8]
ヤスデ由来HNLの製造方法であって、
[1]~[7]のいずれか1項に記載の方法でヤスデ由来HNL遺伝子を調製し、
得られたHNLの遺伝子を、宿主細胞内で発現させて、HNLを得ることを含む前記方法。
[9]
前記宿主細胞が、
昆虫培養細胞である[8]に記載の方法。
[10]
前記宿主細胞が、
ジスルフィド結合イソメラーゼ発現能を有する大腸菌である、[8]に記載の方法。
[11]
下記(4)~(6)の何れかの塩基配列を有する遺伝子。
(4)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;
(5)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列において1から50個の塩基の欠失、置換及び/又は付加を有する塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;又は
(6)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列とストリンジェントな条件下でハイブリダイスする塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列。
[12]
[11]に記載の遺伝子をベクター中に含むプラスミド。
[13]
[11]に記載の遺伝子をベクター中に含むプラスミドを発現可能に含む宿主からなる形質転換体であって、前記宿主は、昆虫培養細胞、又はジスルフィド結合イソメラーゼ発現能を有する大腸菌である、形質転換体。
[14]
ヤスデ由来HNLの製造方法であって、
[13]に記載の形質転換体を培養し、培養物からHNLを分離することを含む、HNLの製造方法。
[15]
宿主が昆虫培養細胞であり、HNL遺伝子が、ウマガエシアカヤスデ、ヤケヤスデ、ヘラババヤスデ、キシャヤスデ、ミドリババヤスデ、またはアマビコヤスデ由来HNL遺伝子である、[14]に記載の方法。
[16]
宿主がジスルフィド結合イソメラーゼ発現能を有する大腸菌であり、HNL遺伝子が、ウマガエシアカヤスデ、ヤケヤスデまたはキシャヤスデ由来HNLの遺伝子である、[14]に記載の前記方法。
[17]
下記(1)~(3)の何れかのアミノ酸配列を有し、かつHNL活性を有するタンパク質。
(1)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列;
(2)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列において1から50個のアミノ酸の欠失、置換及び/又は付加を有するアミノ酸配列;又は
(3)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列に対して90%以上の同一性を有するアミノ酸配列
[18]
下記(1)~(3)の何れかのアミノ酸配列を有し、かつHNL活性を有する[17]に記載のタンパク質。
(1)配列表の配列番号85又は87に記載のアミノ酸配列;
(2)配列表の配列番号85又は87に記載のアミノ酸配列において1から50個のアミノ酸の欠失、置換及び/又は付加を有するアミノ酸配列;又は
(3)配列表の配列番号85又は87に記載のアミノ酸配列に対して90%以上の同一性を有するアミノ酸配列
[19]
アルデヒドまたはケトンとシアン化水素または反応系においてシアン化物イオンを生成する物質とを含む反応溶媒にヤスデ由来HNLを作用させる光学活性シアノヒドリンを調製することを含む、光学活性シアノヒドリンの製造方法であって、
前記ヤスデ由来HNLが、[17]若しくは[18]に記載のタンパク質であるか、または[13]に記載の形質転換体である、前記方法。
本発明は、ヤスデ由来ヒドロキシニトリルリアーゼ(HNL)遺伝子の製造方法に関する。
この方法は、ヤスデ網に属する生物に存在する遺伝子から、ヤスデ由来HNLの保存アミノ酸配列TAX1DIX2G(配列番号15)(但し、X1はL又はFであり、X2はR又はKである)をコードする塩基配列およびVPNGDKIH(配列番号16)をコードする塩基配列の少なくとも一方を有する遺伝子を選択することを含む方法である。
配列番号15のヤスデ由来HNLの保存アミノ酸配列は、TAX1DIX2Gであり、X1はL又はFであり、X2はR又はKである。X1およびX2の組合せは4通りある。具体的には、以下の4つである。
TALDIRG(配列番号17)
TALDIKG(配列番号18)
TAFDIRG(配列番号19)
TAFDIKG(配列番号20)
配列番号16のヤスデ由来HNLの保存アミノ酸配列は、VPNGDKIHである。
(1)前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなる少なくとも1つのDNAをプライマーとして用いてPCRを行うことにより実施される方法。
(2)前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなるDNAをプローブとして用いて、DNA-DNAハイブリダイゼーションを行うことにより実施される方法。
(3)前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子のシーケンシングを行い、シーケンシングされた遺伝子配列の中から、前記保存アミノ酸配列をコードする塩基配列を有する遺伝子を選択することにより実施される方法。
鋳型として用いるヤスデ網に属する生物に存在する遺伝子は上記のように抽出したゲノムDNAまたはcDNAであることができ、好ましくはcDNAであり、これらのDNAを鋳型とし、前記配列番号15および16で示される保存アミノ酸配列をコードする塩基配列からなる少なくとも1つのDNAをプライマーとして用いてPCRを行う。プライマーの塩基配列は、配列番号15および16で示される保存アミノ酸配列をコードするものであれば、制限はないが、例えば、下記の縮重プライマーHNL-FW及びHNL-RV、並びにHNL-FW2及びHNL-RV2を挙げることができる。これら縮重プライマーを用いてPCRを行い、前記生物由来のHNL遺伝子を増幅することができる。
HNL-RV:ATGAATCTTRTCRCCGTTTGGAAC(配列番号22)
HNL-FW2:SSAACTGCATTGGAYATMMRAGG(配列番号23)
HNL-RV2:ATGAATCTTRTCRCCRTTTGGRAC(配列番号24)
鋳型として用いるヤスデ網に属する生物に存在する遺伝子は上記のように抽出したゲノムDNAまたはcDNAであることができ、好ましくは抽出したゲノムDNAであり、これらのDNAを鋳型とし、前記配列番号15および16で示される保存アミノ酸配列をコードする塩基配列からなる少なくとも1つのDNAをプローブとして用いて、DNA-DNAハイブリダイゼーションを行う。DNA-DNAハイブリダイゼーションは、公知の方法を適宜利用できる。プローブの塩基配列は、配列番号15および16で示される保存アミノ酸配列をコードするものであれば、制限はないが、例えば、前記の縮重プライマーHNL-FW及びHNL-RVと同様の塩基配列又はこれら塩基配列の一部を含む塩基配列であることができる。これらプローブを用いてDNA-DNAハイブリダイゼーションを行い、前記生物由来のHNL遺伝子を得る。DNA-DNAハイブリダイゼーションで得られたHNL遺伝子は、PCRなど公知の増幅方法で適宜増幅することができる。
ヤスデ網に属する生物に存在する遺伝子のシーケンシングを行う。シーケンシングを行う対象は、上記のように抽出したゲノムDNAまたはcDNAであることができる。シーケンシングの方法は公知の方法を適宜利用することができる。シーケンシングされた遺伝子配列の中から、前記保存アミノ酸配列をコードする塩基配列を有する遺伝子を選択する。
実施例では、オビヤスデ目ヤケヤスデ科に属すウマガエシアカヤスデ、ヤケヤスデ、オビヤスデ目ババヤスデ科に属すヘラババヤスデ、キシャヤスデ、ミドリババヤスデ、及びアマビコヤスデのHNL遺伝子をクローニングすることができたことを示す。
本発明は、下記(4)~(6)の何れかの塩基配列を有する遺伝子に関する。
(4)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;
(5)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列において1から50個の塩基の欠失、置換及び/又は付加を有する塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;又は
(6)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列とストリンジェントな条件下でハイブリダイスする塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列。
本発明は、ヤスデ由来HNLの製造方法を包含する。
ヤスデ由来HNLの製造方法(1)は、上記本発明の方法でヤスデ由来HNL遺伝子を調製し、得られたHNLの遺伝子を、昆虫培養細胞を宿主として用いて発現させて、HNLを得ることを含む方法である。
本発明は、下記(1)~(3)の何れかのアミノ酸配列を有し、かつHNL活性を有するタンパク質に関する。
(1)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列;
(2)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列において1から50個のアミノ酸の欠失、置換及び/又は付加を有するアミノ酸配列;又は
(3)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列に対して90%以上の同一性を有するアミノ酸配列
本発明は、光学活性シアノヒドリンの製造方法を包含する。
この方法は、アルデヒドまたはケトンとシアン化水素または反応系においてシアン化物イオンを生成する物質とを含む反応溶媒にヤスデ由来HNLを作用させる光学活性シアノヒドリンを調製することを含む。
式(I) において、R1 とR2 は、(i)水素原子、(ii)置換または非置換の炭素数1~18の線状または分枝鎖状の飽和アルキル基、または(iii) 置換または非置換の環員が5~22の芳香族基である。ただし、R1 とR2 は同時に水素原子を表すことはない。上記(ii)で、R1 とR2 が置換アルキル基の場合、置換基は、1個またはそれ以上のアミノ基、イミノ基、ヒドロキシ基、炭素数1~8のアルコキシ基、ハロゲン、カルボキシル基、炭素数3~20のシクロアルキル基、または N 、O、Sのヘテロ原子で置換されていてもよい炭素数22までの芳香属基である(ここで、置換基が環状置換基の場合は、それ自体が1個またはそれ以上のハロゲン、ヒドロキシ基、炭素数1~8の線状若しくは分枝鎖状のアルキル基、炭素数2~8の線状若しくは分枝鎖状のアルケニル基で置換されていてもよい。)。上記(iii) で、芳香族基は、環員の4個までがN、Oおよび/またはSによって置換されているヘテロ芳香族基であってもよい。また、R1 とR2 が置換芳香族基の場合、置換基は、1個またはそれ以上のアミノ基、イミノ基、ヒドロキシ基、炭素数1~8のアルコキシ基、アリルオキシ基、ハロゲン、カルボキシル基、炭素数22までの線状若しくは分枝鎖状の飽和若しくは不飽和のアルキル基である(ここで、一つの芳香族基が少なくとも2個の置換基により置換されてもよい)。
難溶または不溶である有機溶媒を主成分としてなる反応溶媒を用いることが好ましい。かかる有機溶媒としては、酵素反応による光学活性シアノヒドリンの合成反応に影響を与えないものであれば特に制限なく用いることができ、合成反応に用いる原料のアルデヒドまたはケト
ンの物性、生成物であるシアノヒドリンの物性に応じて適宜選択することができる。具体的には、ハロゲン化されていてもよい脂肪族または芳香族の直鎖状または分枝状または環状の飽和または不飽和炭化水素系溶媒、例えば、ペンタン、ヘキサン、トルエン、キシレン、塩化メ
チレンなど;ハロゲン化されていてもよい脂肪族または芳香族の直鎖状または分枝状または環状の飽和または不飽和アルコール系溶媒、例えば、イソプルピルアルコール、n-ブタノール、イソブタノール、t-ブタノール、ヘキサノール、シクロヘキサノール、n-アミルアルコールなど;ハロゲン化されていてもよい脂肪族また
は芳香族の直鎖状または分枝状または環状の飽和または不飽和エーテル系溶媒、例えば、ジエチルエーテル、ジプロピルエーテル、ジイソピルエーテル、ジブチルエーテル、メチル-t-ブチルエーテルなど;ハロゲン化されていてもよい脂肪族または芳香族の直鎖状または分枝
状または環状の飽和または不飽和エステル系溶媒、例えば、ギ酸メチル、酢酸メチル、酢酸エチル、酢酸ブチル、プロピオン酸メチルなどが挙げられ、これらを単独で用いても、また複数を混合して用いてもよい。また、これらの有機溶媒は、pH7 以下の水系緩衝液、例えばク
エン酸緩衝液、リン酸緩衝液、酢酸緩衝液などで飽和させてもよい。
整する。反応温度は酵素反応によらないラセミシアノヒドリンの副生を抑制するために、酵素活性が発揮される範囲でできる限り低いほうが好ましく、通常0~50℃、好ましくは10~45℃とする。
は、蒸留分離、カラムクロマトグラフィー分離、抽出分離など通常用いられる手段で行いうる。このとき、脱水剤などを添加して脱水処理をしたり、安定剤などを添加してもよい。
0.4UのHNL、300mM クエン酸緩衝液(pH4~5)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、30~35℃の温度で5分間行い、HPLCを用いて(R)-マンデロニトリルを定量する。
タンバアカヤスデ、Nedyopus tambanus tambanus(Attems)を富山県立大学内で採集した。ヤスデから粗酵素液を抽出し、以下のようにNttHNLの精製を行った。
タンバアカヤスデからTRIzol(インビトロジェン社製)を使用してtotal RNAを抽出し、Gene Racer Kit(インビトロジェン社製)を用いてcDNAを合成した。NttHNLのN末端アミノ酸配列と内部配列から縮重プライマーを設計し、NttHNLをコードするcDNAの部分配列をPCRにより増幅した。
縮重プライマー配列:
NttHNL-F:GARGARCCNHTNACNTGYGATAA(配列番号25)、
NttHNL-R:TTYTCNACNGCYTGNGTCTG(配列番号26)
プライマー配列:
NttHNL-F1:GTTCCAGTTCCTCCGTTAGAAGATTTT(配列番号27)、
NttHNL-F2:CCCAGGCTGCAACTGCATTGGACATT(配列番号28)、
NttHNL-R1:CTCTGCAATTGCAGAACCATTGCACGTA(配列番号29)、
NttHNL-R1:CCATTTGGGGTGTTCAAATTAGTATATT(配列番号30)
ジーンスペシフィックプライマー配列:
NttHNL-FW:ATGCTGTTTTACGTTTCGATTCTTCTAG(配列番号31)、
NttHNL-RV:TTAATAGAAAGCAAAACAACCATGGTG(配列番号32)
ウマガエシアカヤスデ(N. tambanus mangaesinus (Attems))、ヤケヤスデ(Oxidus gracilis (C. L. Koch))、ヘラババヤスデ(Parafontaria falcifera (Verhoeff))、キシャヤスデ(P. laminata (Attems))、ミドリババヤスデ(P. tonominea Attems)、アマビコヤスデの1種(Riukiaria sp.)、それぞれ1個体から、前述の方法でtotal RNAを調製し、Gene Racer KitまたはSMART RACE cDNA Amplification Kit(クロンテック社製)を用いてcDNAを合成した。ChuaHNLとNttHNLの相同配列から設計した縮重プライマーを用いてPCRを行うことで、各ヤスデ由来HNL遺伝子の部分配列を増幅した。
縮重プライマー配列:
HNL-FW:CTGCAACTGCATTGGAMATTCAAGG(配列番号17)、
HNL-RV:ATGAATCTTRTCRCCGTTTGGAAC(配列番号18)
プライマー配列:
NtmHNL-F1:TGGTGGACCTAATAACTCCGCCATA(配列番号33)、
NtmHNL-F2:CCCAGATGGAAGTTCATATTGCGCTTA(配列番号34)、
NtmHNL-R1:GAGTGGGTCGGTTCCATTGTTATTAT(配列番号35)、
NtmHNL-R2:GCCATTGCACGTATAAGCGCAATAT(配列番号36)、
OgraHNL-F1:CGTTGGTGGTCCTAATAATTCAGCTAT(配列番号37)、
OgraHNL-F2:CACCAATCTGAACACTCCAAATGGAA、(配列番号38)
OgraHNL-R1:GGATCGGTTCCGTTGTTGTTATTA(配列番号39)、
OgraHNL-R2:CGTATAGGCGCAATAGGAGCTTCCATT(配列番号40)、
PfalHNL-F1:GACTTCACCATTGGTTCTGATTCTAT(配列番号41)、
PfalHNL-F2:CCCCAAGGTGCCAACTATTGTGCATA(配列番号42)、
PfalHNL-R1:CAGCCTGACGTTGTGTAGCTGATATGT(配列番号43)、
PfalHNL-R2:CGGGACCATTGCAAGAGTATGCACAAT(配列番号44)、
PlamHNL-F1:ATTCAAGGAACTCACATAACAATAAATGACTTC(配列番号45)、
PlamHNL-F2:ATGAATCTTGTCACCGTTTGGAACTGATCG(配列番号46)、
PlamHNL-R1:GAGTTGTTTAGGCGATATGTATCCAGTATTC(配列番号47)、
PlamHNL-R2:GAGTTGTTTAGGCGATATGTATCCAGTATTC(配列番号48)、
Pton1HNL-F1:GGTCCCGATGCTATGACGGCCTATTT(配列番号49)、
Pton1HNL-F2:GGTGCCAACTATTGTGCATACTTTT(配列番号50)、
Pton1HNL-R1:GCCTGGAGTTGTTGAGGCGATATGTA(配列番号51)、
Pton1HNL-R2:GGGACCATTGCAAAAGTATGCACAATA(配列番号52)、
RspHNL-F1:CCGGGGCAAAACAGGTTTGGTA(配列番号53)、
RspHNL-F2:GGGTGCCAACTATTGCGCATACTCTT(配列番号54)、
RspHNL-R1:GCCAGTATTGGAAGTGCATTTGTATT(配列番号55)、
RspHNL-R2:CAGGGGATCATCGAGGTCGACATATT(配列番号56)
PtokHNL-F1:GGACAGCCTTTTCGACTAATTGTGAT(配列番号91)
PtokHNL-F2:CCCAAGGTGCCAACTACTGTGCATA(配列番号92)
PtokHNL-R1:GCCTGGAGTTGTTGAGGCGATATGTAT(配列番号93)
PtokHNL-R2:GCAAGAGTAGCCTATGCACAGTAGTTG(配列番号94)
Pton2HNL-F1:CCGATGGTCTGACAGCCTATTTGACTA(配列番号95)
Pton2HNL-F2:CCCCAAGGTGCCAACTACTGTGCATA(配列番号96)
Pton2HNL-R1:GGCGATATGTATCCAGTATTCGTAGTGCA(配列番号97)
Pton2HNL-R2:CGGGACCATTGCAAGAGTATGCACAGT(配列番号98)
Pton3HNL-F1:CTGACAGCCTATTTGACTAATTGTGAT(配列番号99)
Pton3HNL-F2:GCATACTCTTGCAATGGTTCCGAAA(配列番号100)
Pton3HNL-R1:GCCTGGAGTTGTTGAGGCGATATGTAT(配列番号101)
Pton3HNL-R2:CGGAACCATTGCAAGAGTATGCACA(配列番号102)
RssHNL-F1:GACTTCCTCATCGCTCCTGATTGTAT(配列番号103)
RssHNL-F2:CGTCGAGGATCCCAAGGGTGCCAA(配列番号104)
RssHNL-R1:GCCAGCTATATTGGAAGTGCATTT(配列番号105)
RssHNL-R2:CCATCGCAAGAGTATGCGCAATAGTT(配列番号106)
ジーンスペシフィックプライマー配列:
NtmHNL-FW:ATGCTGTTTTACGTCTCGATTCTTC(配列番号57)、
NtmHNL-RV:TCAATAGAAAGCAAAACAGCCATGG(配列番号58)、
OgraHNL-FW:ATGTTGTACTACGTTTCAATACTTT(配列番号59)、
OgraHNL-RV:CTAATAGAAAGCAAAACAGCCATGG(配列番号60)、
PfalHNL-FW:ATGACTTCGATCATTTTCCTCACG(配列番号61)、
PfalHNL-RV:TTAGTAATAGAGAGGACAGAAAGGG(配列番号62)、
PlamHNL-FW:ATGACTTCGATCATTCTCCTCATGACTG(配列番号63)、
PlamHNL-RV:GCTTAATTCAATTGCACTTTAATTTTTATATC(配列番号64)、
Pton1HNL-FW:ATGACTTCAATCATTCTCCTCTTGG(配列番号65)、
Pton1HNL-RV:TTAGTAATAGAGAGGACAGAAAGGGTG(配列番号66)、
RspHNL-FW:ATGACTTCGATCATGTTCAGCCTG(配列番号67)、
RspHNL-RV:TTAGCTATAGAAGGGGCAGATAGGG(配列番号68)
PtokHNL-FW:ATGACTTCGATCATTCTCCTCACG(配列番号107)
PtokHNL-RV:TTAGTAATAGAGGGGACAGAAAAGG(配列番号108)
Pton2HNL-FW:ATGACTTCGATCATTCTCCTCACG(配列番号109)
Pton2HNL-RV:TTAGTAATAGAGAGGACAGTAAAGGTG(配列番号110)
Pton3HNL-FW:ATGACTTCGATCATTCTCCTCACG(配列番号111)
Pton3HNL-RV:TTAGTAATAGAGAGGACAGTAAAGG(配列番号112)
RssHNL-FW:ATGACTTCGATCATGCTCTGTTTAAC(配列番号113)
RssHNL-RV:TTAGCTATAGAAGGGGCAGAAAGGG(配列番号114)
ChuaHNL:ヤンバルトサカヤスデ由来ヒドロキシニトリルリアーゼ
NttHNL:タンバアカヤスデ由来ヒドロキシニトリルリアーゼ(配列番号1)
NtmHNL:ウマガエシアカヤスデ由来ヒドロキシニトリルリアーゼ(配列番号3)
OgraHNL:ヤケヤスデ由来ヒドロキシニトリルリアーゼ(配列番号5)
PfalHNL:ヘラババヤスデ由来ヒドロキシニトリルリアーゼ(配列番号7)
Pton1HNL:ミドリババヤスデ由来ヒドロキシニトリルリアーゼ(配列番号9)
PlamHNL:キシャヤスデ由来ヒドロキシニトリルリアーゼ(配列番号11)
RspHNL:アマビコヤスデの1種由来ヒドロキシニトリルリアーゼ(配列番号13)
PtokHNL:P. tokaiensis由来ヒドロキシニトリルリアーゼ(配列番号83)
Pton2HNL:ミドリババヤスデ由来ヒドロキシニトリルリアーゼ(配列番号85)
Pton3HNL:ミドリババヤスデ由来ヒドロキシニトリルリアーゼ(配列番号87)
RssHNL:アマビコヤスデ由来ヒドロキシニトリルリアーゼ(配列番号89)
それぞれの遺伝子の塩基配列を配列番号2、4、6、8、10、12、1484、86、88、及び90に示す。それぞれのアミノ酸配列の相同性を表1にまとめた。この方法で、ChuaHNLと、41%以上の相同性を有するヤスデ由来ヒドロキシニトリルリアーゼをコードする遺伝子をクローニングできることが明らかとなった。
ヤンバルトサカヤスデから実施例3に示した方法でtotal RNAを調製し、cDNAを合成した。プライマーを用いてChuaHNLをコードする領域を増幅し、pCR-bluntへつなぎこんだ。
プライマー配列:
ChuaHNL-FW:ggatccATGTTGAGTTCACTAGTAGTAACAGTAA(配列番号69)、
ChuaHNL-RV:aagcttAGTAAAAAGCAAAGCAACCGTGGGTTTCG(配列番号70)
上記のヤスデ由来ヒドロキシニトリルリアーゼ遺伝子をバキュロウイルス-昆虫細胞発現系を用いて発現した。インサートDNAは実施例2,3および4で得た各プラスミドDNAを鋳型とし、各種プライマーとTks Gflex DNA polymerase を用いてPCRにより調製した。
IFSf-NttHNL-FW:gggcgcggatccATGCTGTTTTACGTTTCGATTC(配列番号71),
IFSf-NttHNL-RV:acttctcgacaagcttTTAATAGAAAGCAAAACAACCATGG(配列番号72),
IFSf-NtmHNL-FW:catcgggcgcggatccATGCTGTTTTACGTTTCGATTCTTC(配列番号73),
IFSf-NtmHNL-RV:acttctcgacaagcttTCAATAGAAAGCAAAACAGCCATGG(配列番号74),
IFSf-OgraHNL-FW:catcgggcgcggatccATGTTGTACTACGTTTCAATAC(配列番号75),
IFSf-OgraHNL-RV:acttctcgacaagcttCTAATAGAAAGCAAAACAGCCATG(配列番号76),
IFSf-PfalHNL-FW:catcgggcgcggatccATGACTTCGATCATTTTCCTCACG(配列番号77),
IFSf-PfalHNL-RV:acttctcgacaagcttTTAGTAATAGAGAGGACAGAAAGGG(配列番号78),
IFSf-Pton1HNL-FW:catcgggcgcggatccATGACTTCAATCATTCTCCTCTTG(配列番号79),
IFSf-Pton1HNL-RV:acttctcgacaagcttTTAGTAATAGAGAGGACAGAAAGGGTG(配列番号80),
IFSf-RspHNL-FW:catcgggcgcggatccATGACTTCGATCATGTTCAGCCTG(配列番号81),
IFSf-RspHNL-RV:acttctcgacaagcttTTAGCTATAGAAGGGGCAGATAGGG(配列番号82)
IFSf-PtokHNL-FW:catcgggcgcggatccATGACTTCGATCATTCTCCTCACG(配列番号115)
IFSf-PtokHNL-RV:acttctcgacaagcttTTAGTAATAGAGGGGACAGAAAAGG(配列番号116)
IFSf-Pton2HNL-FW:catcgggcgcggatccATGACTTCGATCATTCTCCTCACG(配列番号117)
IFSf-Pton2HNL-RV:acttctcgacaagcttTTAGTAATAGAGAGGACAGTAAAGGTG(配列番号118)
IFSf-Pton3HNL-FW:catcgggcgcggatccATGACTTCGATCATTCTCCTCACG(配列番号119)
IFSf-Pton3HNL-RV:acttctcgacaagcttTTAGTAATAGAGAGGACAGTAAAGG(配列番号120)
IFSf-RssHNL-FW:catcgggcgcggatccATGACTTCGATCATGCTCTGTTTA(配列番号121)
IFSf-RssHNL-RV:acttctcgacaagcttttagcTATAGAAGGGGCAGAAAGGG(配列番号122)
大腸菌BL21(DE3)及びSHuffle T7(ニューイングランドバイオラボ社製)における、ChuaHNL、NttHNL、NtmHNL、OgraHNL、PfalHNL、Pton1HNL、PlamHNL、RspHNL、PtokHNL、Pton2HNL、Pton3HNL、RssHNL遺伝子発現を試みた。
OgraHNLの精製は以下のように行った。実施例6の方法で調製した無細胞抽出液をHisTrap HP(GEヘルスケア社製)に添加した。OgraHNLはイミダゾールの濃度勾配(20-500mM)で溶出した。OgraHNLが溶出されたフラクションを回収し、ResourceQ(GEヘルスケア社製)に添加した。OgraHNLは塩化ナトリウムの濃度勾配(0-300mM)で溶出した。OgraHNLが溶出されたフラクションを回収し、アミコンウルトラ-4 遠心式フィルターユニット(ミリポア社製)を用いて濃縮した。その後、Superdex75 10/300 GL(GEヘルスケア社製)に添加し、0.1M NaClを含む10mM HEPES-NaOH(pH8.0)で溶出した。精製工程を表2bにまとめた。
(a)至適温度と温度安定性
OgraHNLの至適温度と温度安定性を検討した。酵素反応は、0.4UのOgraHNL、300mM クエン酸緩衝液(pH4.2)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量し、測定結果を図2-Aに示した。OgraHNLの至適温度は35℃と推定された。
OgraHNLの至適pHとpH安定性を検討した。酵素反応は、0.4UのOgraHNL、300mM クエン酸緩衝液(pH2.5-5.5)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量した。測定結果を図2-Bに示した。OgraHNLの至適pHは5.0と推定された。
各緩衝液中で25℃、60分間インキュベート後、残存活性を測定することで、pH安定性を検討した。測定結果を図2-Dに示した。OgraHNLはpH3-10.5で安定であった。しかし、Tris-HCl緩衝液中では、不安定であることが示された。
NtmHNLの精製は以下のように行った。実施例6の方法で調製した無細胞抽出液をHisTrap HP(GEヘルスケア社製)に添加した。NtmHNLはイミダゾールの濃度勾配(20-500mM)で溶出した。NtmHNLが溶出されたフラクションを回収し、ResourceQ(GEヘルスケア社製)に添加した。NtmHNLは塩化ナトリウムの濃度勾配(0-300mM)で溶出した。精製工程を表3にまとめた。精製したNtmHNLは(R)-マンデロニトリル合成活性を示し、その比活性は、1016U/mgであった。
(a)至適温度と温度安定性
NtmHNLの至適温度と温度安定性を検討した。酵素反応は、0.4UのNtmHNL、300mM クエン酸緩衝液(pH4.2)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量し、測定結果を図3-Aに示した。NtmHNLの至適温度は30℃と推定された。
NtmHNLの至適pHとpH安定性を検討した。酵素反応は、0.4UのNtmHNL、300mM クエン酸緩衝液(pH2.5-5.5)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量し、測定結果を図3-Bに示した。NtmHNLの至適pHは4.8と推定された。
PlamHNLの精製は以下のように行った。実施例6の方法で調製した無細胞抽出液をNi Sepharose 6 FastFlow(GEヘルスケア社製)に添加した。PlamHNLは100mM イミダゾール、500mM 塩化ナトリウムを含む20mM KPB(pH8.0)で溶出した。精製したPlamHNLは(R)-マンデロニトリル合成活性を示し、その比活性は1156U/mgであった。
Pton3HNLの精製は以下のように行った。実施例6の方法で調製した無細胞抽出液をHisTrap HP(GEヘルスケア社製)に供し、イミダゾールの濃度勾配(20-500mM)で溶出した。Pton3HNLが溶出されたフラクションを回収後、ResourceQ(GEヘルスケア社製)に供し、塩化ナトリウムの濃度勾配(0-300mM)で溶出した。Pton3HNLが溶出されたフラクションを回収し、精製酵素として使用した。
(a)至適温度と温度安定性
Pton3HNLの至適温度と温度安定性を検討した。酵素反応は、0.4UのPton3HNL、300mM クエン酸緩衝液(pH4.2)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量し、測定結果を図11aに示した。Pton3HNLの至適温度は30℃と推定された。
Pton3HNLの至適pHとpH安定性を検討した。酵素反応は、0.4UのPton3HNL、300mM クエン酸緩衝液(pH2.5-5.5)、50mM ベンズアルデヒド、100mM KCNを含む反応液200μl、各温度で、5分間行った。HPLCを用いて(R)-マンデロニトリルを定量した。測定結果を図11bに示した。Pton3HNLの至適pHは4.5と推定された。
各緩衝液中で25℃、60分間インキュベート後、残存活性を測定することで、pH安定性を検討した。測定結果を図11dに示した。Pton3HNLはpH3-10.5で安定であった。
組換え大腸菌体を用いた(R)-mandelonitrileの生産
Pton3HNLを発現させたE.coli Shuffleを用いて水溶液中での全菌体反応による光学活性シアノヒドリン合成を行った。培養液0.8 mLから集菌後、150μLの0.4 Mクエン酸緩衝液 (pH3.0)に懸濁し10 μLの1 M ベンズアルデヒド、20 μLの1 M KCNを加えて22℃で5分インキュベートした。反応産物は、抽出後、上記の通りHPLCにて分析を行い、鏡像体過剰率(ee)を明らかにした結果、図12の通り、鏡像体過剰率(ee)は、97.6%に達した。
pHを2.5~5.0の範囲で変化させた結果を図12aに示し、菌体の濃度を2倍(2x)、4倍(4x)、6倍(6x)を変化させた結果を図12bに示す。
配列番号2:NttHNL遺伝子
配列番号3:NtmHNLタンパク質
配列番号4:NtmHNL遺伝子
配列番号5:OgraHNLタンパク質
配列番号6:OgraHNL遺伝子
配列番号7:PfalHNLタンパク質
配列番号8:PfalHNL遺伝子
配列番号9:Pton1HNLタンパク質
配列番号10:Pton1HNL遺伝子
配列番号11:PlamHNLタンパク質
配列番号12:PlamHNL遺伝子
配列番号13:RspHNLタンパク質
配列番号14:RspHNL遺伝子
配列番号15:ヤスデ由来HNLの保存アミノ酸配列
配列番号16:ヤスデ由来HNLの保存アミノ酸配列
配列番号17:ヤスデ由来HNLの保存アミノ酸配列
配列番号18:ヤスデ由来HNLの保存アミノ酸配列
配列番号19:ヤスデ由来HNLの保存アミノ酸配列
配列番号20:ヤスデ由来HNLの保存アミノ酸配列
配列番号21:縮重プライマーHNL-FW
配列番号22:縮重プライマーHNL-RV
配列番号23:縮重プライマーHNL-FW2
配列番号24:縮重プライマーHNL-RV2
配列番号25~82:プライマー
配列番号83:PtokHNLタンパク質
配列番号84:PtokHNL遺伝子
配列番号85:Pton2HNLタンパク質
配列番号86:Pton2HNL遺伝子
配列番号87:Pton3HNLタンパク質
配列番号88:Pton3HNL遺伝子
配列番号89:RssHNLタンパク質
配列番号90:RssHNL遺伝子
配列番号91~122:プライマー
Claims (19)
- ヤスデ由来ヒドロキシニトリルリアーゼ(以下、HNL)遺伝子の製造方法であって、
ヤスデ網に属する生物に存在する遺伝子から、ヤスデ由来HNLの保存アミノ酸配列TAX1DIX2G(配列番号15)(但し、X1はL又はFであり、X2はR又はKである)をコードする塩基配列およびVPNGDKIH(配列番号16)をコードする塩基配列の少なくとも一方を有する遺伝子を選択することを含む方法。 - 前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなる少なくとも1つのDNAをプライマーとして用いてPCRを行うことにより実施される、請求項1に記載の方法。
- 前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子を鋳型として、前記保存アミノ酸配列をコードする塩基配列からなるDNAをプローブとして用いて、DNA-DNAハイブリダイゼーションを行うことにより実施される、請求項1に記載の方法。
- 前記遺伝子の選択が、ヤスデ網に属する生物に存在する遺伝子のシーケンシングを行い、シーケンシングされた遺伝子配列の中から、前記保存アミノ酸配列をコードする塩基配列を有する遺伝子を選択することにより実施される、請求項1に記載の方法。
- ヤスデ網に属する生物に存在する遺伝子が、ヤスデ網に属する生物より抽出したゲノムDNA、又は、ヤスデ網に属する生物より抽出したRNAより逆転写で得られるcDNAである請求項1~4のいずれか1項に記載の方法。
- 前記プライマーが、下記の縮重プライマーHNL-FW及びHNL-RVまたはHNL-FW2及びHNL-RV2である請求項2に記載の方法。
HNL-FW:CTGCAACTGCATTGGAMATTCAAGG(配列番号21)、
HNL-RV:ATGAATCTTRTCRCCGTTTGGAAC(配列番号22)
HNL-FW2:SSAACTGCATTGGAYATMMRAGG(配列番号23)
HNL-RV2:ATGAATCTTRTCRCCRTTTGGRAC(配列番号24) - ヤスデ網に属する生物が、ウマガエシアカヤスデ、ヤケヤスデ、ヘラババヤスデ、キシャヤスデ、ミドリババヤスデ、またはアマビコヤスデである請求項1~6のいずれか1項に記載の方法。
- ヤスデ由来HNLの製造方法であって、
請求項1~7のいずれか1項に記載の方法でヤスデ由来HNL遺伝子を調製し、
得られたHNLの遺伝子を、宿主細胞内で発現させて、HNLを得ることを含む前記方法。 - 前記宿主細胞が、
昆虫培養細胞である請求項8に記載の方法。 - 前記宿主細胞が、
ジスルフィド結合イソメラーゼ発現能を有する大腸菌である、請求項8に記載の方法。 - 下記(4)~(6)の何れかの塩基配列を有する遺伝子。
(4)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;
(5)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列において1から50個の塩基の欠失、置換及び/又は付加を有する塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列;又は
(6)配列表の配列番号2、4、6、8、10、12、14、84、86、88又は90に記載の塩基配列とストリンジェントな条件下でハイブリダイスする塩基配列を有し、HNL活性を有するタンパク質をコードする塩基配列。 - 請求項11に記載の遺伝子をベクター中に含むプラスミド。
- 請求項11に記載の遺伝子をベクター中に含むプラスミドを発現可能に含む宿主からなる形質転換体であって、前記宿主は、昆虫培養細胞、又はジスルフィド結合イソメラーゼ発現能を有する大腸菌である、形質転換体。
- ヤスデ由来HNLの製造方法であって、
請求項13に記載の形質転換体を培養し、培養物からHNLを分離することを含む、HNLの製造方法。 - 宿主が昆虫培養細胞であり、HNL遺伝子が、ウマガエシアカヤスデ、ヤケヤスデ、ヘラババヤスデ、キシャヤスデ、ミドリババヤスデ、またはアマビコヤスデ由来HNL遺伝子である、請求項14に記載の方法。
- 宿主がジスルフィド結合イソメラーゼ発現能を有する大腸菌であり、HNL遺伝子が、ウマガエシアカヤスデ、ヤケヤスデまたはキシャヤスデ由来HNLの遺伝子である、請求項14に記載の前記方法。
- 下記(1)~(3)の何れかのアミノ酸配列を有し、かつHNL活性を有するタンパク質。
(1)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列;
(2)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列において1から50個のアミノ酸の欠失、置換及び/又は付加を有するアミノ酸配列;又は
(3)配列表の配列番号1、3、5、7、9、11、13、83、85、87又は89に記載のアミノ酸配列に対して90%以上の同一性を有するアミノ酸配列 - 下記(1)~(3)の何れかのアミノ酸配列を有し、かつHNL活性を有する請求項17に記載のタンパク質。
(1)配列表の配列番号85又は87に記載のアミノ酸配列;
(2)配列表の配列番号85又は87に記載のアミノ酸配列において1から50個のアミノ酸の欠失、置換及び/又は付加を有するアミノ酸配列;又は
(3)配列表の配列番号85又は87に記載のアミノ酸配列に対して90%以上の同一性を有するアミノ酸配列 - アルデヒドまたはケトンとシアン化水素または反応系においてシアン化物イオンを生成する物質とを含む反応溶媒にヤスデ由来HNLを作用させる光学活性シアノヒドリンを調製することを含む、光学活性シアノヒドリンの製造方法であって、
前記ヤスデ由来HNLが、請求項17若しくは18に記載のタンパク質であるか、または請求項13に記載の形質転換体である、前記方法。
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