WO2016129637A1 - 核酸、融合タンパク質、組換え細胞、並びに、イソプレン又は環式テルペンの生産方法 - Google Patents
核酸、融合タンパク質、組換え細胞、並びに、イソプレン又は環式テルペンの生産方法 Download PDFInfo
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- WO2016129637A1 WO2016129637A1 PCT/JP2016/053977 JP2016053977W WO2016129637A1 WO 2016129637 A1 WO2016129637 A1 WO 2016129637A1 JP 2016053977 W JP2016053977 W JP 2016053977W WO 2016129637 A1 WO2016129637 A1 WO 2016129637A1
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- protein
- synthase
- isoprene
- nucleic acid
- cyclic
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- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000019525 primary metabolic process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 108010067247 tacrolimus binding protein 4 Proteins 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000003535 tetraterpenes Chemical class 0.000 description 1
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Images
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- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Definitions
- the present invention relates to a nucleic acid, a fusion protein, a recombinant cell, and a method for producing isoprene or a cyclic terpene, and more specifically, encodes a fusion protein of an isoprene synthase or a cyclic terpene synthase and an FKBP family protein.
- the present invention relates to a nucleic acid, a fusion protein, a recombinant cell having the nucleic acid and the like, and a method for producing isoprene or a cyclic terpene using the recombinant cell.
- Isoprene is a monomer raw material for synthetic polyisoprene, and is an especially important material in the tire industry.
- development and commercialization of technology for converting from the production process of basic chemical products that depend on petroleum to the production process from renewable resources such as plant resources has been steadily progressing.
- Isoprene synthase (isoprene synthase; EC 4.2.3.27) has the effect of converting dimethylallyl diphosphate (DMAPP), which is an isomer of isopentenyl diphosphate (IPP), to isoprene.
- DMAPP dimethylallyl diphosphate
- IPP isopentenyl diphosphate
- Isoprene production methods using recombinant cells are known.
- isoprene is produced using a recombinant cell into which a nucleic acid (gene) encoding isoprene synthase has been introduced.
- the recombinant cells are cultured using methanol or synthesis gas as a carbon source, and isoprene is obtained from the culture.
- production technology using recombinant E. coli using sugar as a raw material is also known (for example, Patent Documents 3 and 4).
- the terpene is a generic name for compounds having 10 or more carbon atoms in which two or more molecules of isopentenyl diphosphate (IPP), which is an isoprene unit (C5), are linked by the action of prenyl transferase.
- IPP isopentenyl diphosphate
- Terpenes are classified into monoterpenes (C10), sesquiterpenes (C15), diterpenes (C20) triterpenes (C30), tetraterpenes (C40), etc., depending on the number of isoprene units.
- cyclic monoterpenes, cyclic sesquiterpenes, and cyclic diterpenes are often useful as perfume raw materials, cosmetic raw materials, pharmaceutical intermediates, adhesive raw materials, and high-functional resin raw materials.
- Cyclic terpenes are synthesized by cyclization of linear terpenes by the action of cyclic terpene synthase.
- a cyclic monoterpene is synthesized by binding two molecules of IPP to produce, for example, geranyl diphosphate (GPP), and then taking a cyclic structure by the action of a cyclic monoterpene synthase.
- GPP geranyl diphosphate
- Cyclic sesquiterpenes are synthesized by cyclization of the precursor farnesyl diphosphate (C15: FPP) by the action of cyclic sesquiterpene synthase.
- Cyclic diterpenes are synthesized by cyclization of the precursor geranylgeranyl diphosphate (C20: GGPP) by the action of cyclic diterpene synthase.
- a method for producing a cyclic terpene using a recombinant cell for example, a method for producing ⁇ -ferrandrene, which is a kind of cyclic monoterpene, is known (Patent Document 5).
- geranyl diphosphate (GPP) or neryl diphosphate (NPP) is converted to ⁇ -ferrandrene using a recombinant cell into which a nucleic acid encoding ⁇ -ferrandrene synthase has been introduced, -Ferrandren is produced.
- GPP geranyl diphosphate
- NPP neryl diphosphate
- ⁇ -Ferlandolene is a natural monomer useful for polymerization because it has a ⁇ -ferrandolene conjugated diene structure.
- this invention aims at providing the technique which improves the stability of isoprene synthase and cyclic terpene synthase in a recombinant cell, and improves the productivity of isoprene and cyclic terpene by a recombinant cell. .
- the present inventors have succeeded in improving the stability of isoprene synthase and cyclic terpene synthase in recombinant cells by using an FKBP family protein which is a kind of molecular chaperone. And by using the said recombinant cell, it succeeded in improving the productivity of isoprene and a cyclic terpene, and completed this invention.
- One aspect of the present invention is a nucleic acid encoding a fusion protein in which a first protein selected from the group consisting of isoprene synthase and cyclic terpene synthase and an FKBP family protein are linked.
- the nucleic acid of this aspect encodes a fusion protein (chimeric protein) in which a first protein selected from the group consisting of isoprene synthase and cyclic terpene synthase and an FKBP family protein are linked.
- a fusion protein chimeric protein
- isoprene synthase or cyclic terpene synthase is stabilized by the action of adjacent FKBP family proteins in the same molecule, so that isoprene synthase activity and cyclic terpene synthase activity are more stably exhibited. Is done.
- the fusion protein when expressed in a recombinant into which the nucleic acid of this aspect has been introduced, the fusion protein can be decomposed by a host protease as compared with a single isoprene synthase or cyclic terpene synthase. Insolubilization hardly occurs.
- the first protein is isoprene synthase.
- the nucleic acid of this aspect encodes a fusion protein in which isoprene synthase and FKBP family protein are linked.
- isoprene synthase is stabilized by the action of adjacent FKBP family proteins in the same molecule, so that isoprene synthase activity is more stably exhibited. Therefore, for example, when the fusion protein is expressed in a recombinant into which the nucleic acid of this aspect is introduced, the fusion protein is less likely to be decomposed or insolubilized by the host protease as compared to a single isoprene synthase.
- the isoprene synthase is any of the following (a-1) to (a-3).
- A-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 2
- A-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 2 and having the activity of isoprene synthase
- A-3) A protein having an amino acid sequence showing 90% or more homology with the amino acid sequence represented by SEQ ID NO: 2 and having the activity of isoprene synthase.
- the first protein is a cyclic monoterpene synthase.
- the cyclic monoterpene synthase is ferrandrene synthase.
- the cyclic monoterpene synthase is any of the following (b-1) to (b-3).
- (B-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 4,
- (B-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 4 and having the activity of ⁇ -ferrandrene synthase
- (B-3) A protein having an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 4 and having the activity of ⁇ -ferrandrene synthase.
- the first protein is a cyclic sesquiterpene synthase.
- the cyclic sesquiterpene synthase is any of the following (c-1) to (c-3).
- (C-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 6,
- (C-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 6, and having activity of trichodiene synthase
- (C-3) a protein having an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 6 and having tricodiene synthase activity.
- the first protein is a cyclic diterpene synthase.
- the first protein is derived from a prokaryotic organism.
- the FKBP family protein is derived from a prokaryotic organism.
- the FKBP family protein is derived from archaea.
- the FKBP family protein has a molecular weight of 20,000 or less.
- the FKBP family protein is any one of the following (d-1) to (d-3).
- D-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 8,
- D-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 8, and having activity as an FKBP family protein;
- D-3) A protein comprising an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 8, and having activity as an FKBP family protein.
- the FKBP family protein belongs to a trigger factor.
- the FKBP family protein is linked to the N-terminal side of the first protein.
- the fusion protein further has a secretory signal sequence.
- One aspect of the present invention is a fusion protein encoded by the above nucleic acid.
- One aspect of the present invention is a recombinant cell that is a bacterium and has the above-described nucleic acid and expresses the fusion protein.
- the recombinant cell of this aspect is a recombinant cell that is a bacterium and expresses the fusion protein. According to the recombinant cell of this aspect, since the isoprene synthase activity or cyclic terpene synthase activity is exhibited by the fusion protein, a more stabilized isoprene synthase activity or cyclic terpene synthase activity can be obtained. .
- One aspect of the present invention is a recombinant cell which is a bacterium, which encodes a first nucleic acid encoding a first protein selected from the group consisting of isoprene synthase and cyclic terpene synthase, and an FKBP family protein. And is a recombinant cell that expresses the isoprene synthase or cyclic terpene synthase and the FKBP family protein.
- the recombinant cell of this aspect is a recombinant cell which is a bacterium and has a first nucleic acid encoding an isoprene synthase or a cyclic terpene synthase and a second nucleic acid encoding an FKBP family protein. According to the recombinant cell of this aspect, since the isoprene synthase or cyclic terpene synthase is stabilized by the coexisting FKBP family protein, more stabilized isoprene synthase activity or cyclic terpene synthase activity is obtained. It is done.
- the first protein is isoprene synthase and expresses the isoprene synthase and the FKBP family protein.
- the recombinant cell of this aspect has a first nucleic acid encoding an isoprene synthase and a second nucleic acid encoding an FKBP family protein. According to the recombinant cell of this aspect, since the isoprene synthase is stabilized by the coexisting FKBP family protein, a more stabilized isoprene synthase activity can be obtained.
- the first protein is a cyclic monoterpene synthase.
- the cyclic monoterpene synthase is ferrandrene synthase.
- the first protein is a cyclic sesquiterpene synthase.
- the first protein is a cyclic diterpene synthase.
- the recombinant cell has the ability to assimilate the C1 compound.
- the recombinant cell has the ability to assimilate methanol or methane.
- the recombinant cell has the ability to assimilate carbon monoxide or carbon dioxide.
- the recombinant cell is an anaerobic bacterium.
- the recombinant cells are Clostridium bacteria or Moorella bacteria.
- One aspect of the present invention is the production of isoprene or cyclic terpene, wherein the recombinant cell is contacted with a gas containing carbon dioxide and hydrogen, and the recombinant cell produces isoprene or cyclic terpene from carbon dioxide. Is the method.
- This aspect relates to a production method of isoprene or cyclic terpene.
- the recombinant cell is contacted with a gas containing carbon dioxide and hydrogen, and the recombinant cell is supplied with isoprene or cyclic terpene from carbon dioxide. Let it be produced.
- isoprene synthase or cyclic terpene synthase expressed in the recombinant cell is stabilized by the FKBP family protein, so that isoprene or cyclic terpene can be produced with high efficiency.
- the gas contains carbon monoxide, carbon dioxide, and hydrogen, and the recombinant cell is allowed to produce isoprene or a cyclic terpene from carbon monoxide and carbon dioxide.
- This aspect also relates to a method for producing isoprene or cyclic terpene, wherein a gas containing carbon monoxide, carbon dioxide, and hydrogen is brought into contact with the recombinant cell, and the carbon monoxide and carbon dioxide are brought into contact with the recombinant cell.
- Isoprene or cyclic terpenes are produced from carbon.
- isoprene synthase or cyclic terpene synthase expressed in recombinant cells is stabilized by FKBP family proteins, so isoprene or cyclic terpene can be produced with high efficiency.
- the isoprene or cyclic terpene released outside the recombinant cell is recovered.
- the isoprene or cyclic terpene is recovered by a solid phase adsorption method.
- the isoprene or cyclic terpene is recovered by a solvent absorption method.
- the production amount can be remarkably improved.
- the nucleic acid (gene) of the present invention encodes a fusion protein (chimeric protein) in which isoprene synthase or cyclic terpene synthase and FKBP family protein are linked.
- the nucleic acid of the present invention is a fusion gene (chimeric gene) in which a gene encoding isoprene synthase or cyclic terpene synthase and a gene encoding FKBP family protein are linked.
- the FKBP family proteins are FK506 binding proteins (FKBPs), and include peptidyl-prolyl cis-trans isomerase (hereinafter referred to as PPIase) activity and molecular chaperone activity. And have.
- FKBP type PPIase The structure and classification of the FKBP family protein (FKBP type PPIase) are described in, for example, International Publication No. 2004/001041, International Publication No. 2005/063964, and the like.
- FKBP family protein may be simply abbreviated as FKBP.
- PPIase activity refers to the activity of catalyzing the cis-trans isomerization reaction of the N-terminal peptide bond of a proline residue in a protein.
- the molecular chaperone activity refers to an activity of refolding a denatured protein into the original normal form or an activity of suppressing irreversible aggregation of the denatured protein.
- the FKBP family protein has an action of promoting the folding speed of a polypeptide based on PPIase activity, and has an insolubilization suppressing action due to interaction with a hydrophobic peptide region based on molecular chaperone activity. Hydrophobic peptide sequence interactions with FKBP family proteins also allow nascent polypeptides to escape protease degradation.
- the origin of the FKBP family protein used in the present invention is not particularly limited.
- those derived from prokaryotes and those derived from archaea (archaea) can be used.
- FKBP family proteins have a molecular weight of 20,000 or less, specifically a short type of about 16,000 to 18,000, and a long type of molecular weight of about 26,000 to 33,000, depending on the molecular weight. Broadly divided into types. In the present invention, either a short type or a long type may be used, but it is preferable to use a short type that has higher molecular chaperone activity. That is, in the present invention, it is preferable to use an FKBP family protein having a molecular weight of 20,000 or less.
- trigger factor type Huang, Protein Sci. 9, 1254-, 2000
- FkpA type Arie, Mol. Microbiol. 39, 199-, 2001
- FKBP52 type Bose, Science 274, 1715-, 1996.
- Any type may be used in the present invention, for example, a trigger factor type FKBP family protein can be used.
- Trigger factor type FKBP family proteins are found in almost all bacterial genomes.
- FKBP family proteins derived from archaea include those derived from Methanococcus thermolithotrophicus, Thermococcus sp. KS-1, and Methanococcus jannaschii (Maruyama, Front. Biosci. 5, 821-, 2000).
- the long-type FKBP family proteins derived from archaea include Pyrococcus horikoshii origin, Aeropyrum pernix origin, Sulfolobus solfataricus origin, Methanococcus jannaschii origin, Archaeoglobus fulgidus origin, Methanobacterium autotrophicum origin, Thermoplasma acidophilum origin, Halobacterium cutirubrum, etc. Maruyama, Front. Biosci. 5, 821-, 2000).
- SEQ ID NO: 7 shows the base sequence of the nucleic acid (DNA) encoding the Thermococcus sp. KS-1 derived short type FKBP family protein (TcFKBP18), and SEQ ID NO: 8 shows only the amino acid sequence.
- the FKBP family protein used in the present invention may be a naturally-occurring and isolated FKBP family protein or a modified form thereof. For example, it may be a partial fragment or an amino acid substitution mutant of an existing FKBP family protein and a protein having activity as an FKBP family protein.
- the activity as a FKBP family protein includes PPIase activity and molecular chaperone activity.
- PPIase activity refers to the activity of catalyzing the cis-trans isomerization reaction of the N-terminal peptide bond of a proline residue in a protein.
- PPIase activity can be evaluated by, for example, the chymotrypsin coupling method (J. Bacteriol. 1998, 180 (2): 388-394).
- the molecular chaperone activity refers to an activity of refolding a denatured protein to the original normal form or an activity of suppressing irreversible aggregation of the denatured protein.
- an evaluation method of molecular chaperone activity for example, rhodanese, citrate synthase, malate dehydrogenase, glucose-6-phosphate dehydrogenase and the like are used as model enzymes (Kawada, Bioscience and Industry, 56, 593- , 1998), and after denaturing these with a protein denaturant such as 6M guanidine hydrochloride, the regeneration rate of the denatured protein that starts when the denaturant is diluted with a buffer containing the subject substance to be assayed, and the aggregation of the denatured protein is suppressed.
- a protein denaturant such as 6M guanidine hydrochloride
- the rate can evaluate the molecular chaperone activity of the test object.
- a method for evaluating the regeneration rate of the denatured protein for example, in the case of Rhodanese, the method of Horobitz et al. (Horowitz, Methods Mol. Biol., 40, 361-, 1995) can be mentioned, and the aggregation suppression of the denatured protein is evaluated. Examples of the method include Taguchi et al.'S method (Taguchi, J. Biol. Chem., 269, 8529-, 1994).
- FKBP family proteins used in the present invention include at least the following proteins (d-1) to (d-3).
- D-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 8,
- D-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 8, and having activity as an FKBP family protein;
- D-3) A protein comprising an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 8, and having activity as an FKBP family protein.
- the homology of the amino acid sequence in (d-3) is more preferably 92% or more, further preferably 95% or more, and particularly preferably 98% or more.
- the homology of amino acid sequences can be calculated using, for example, a commercially available multiple alignment program such as CulustalW.
- IspS isoprene synthase
- the isoprene synthase used in the present invention is not particularly limited.
- those derived from eukaryotes such as plants can be used.
- plant-derived isoprene synthases those derived from populus (Populus nigra), Mucuna, and Kudzu are common, but others are derived from the genus Salix, Robinia, Wisteria, Triticum, Morus, etc. All are applicable to the present invention.
- SEQ ID NO: 1 shows the amino acid sequence corresponding to the base sequence of nucleic acid (DNA) encoding poplar-derived isoprene synthase (GenBank Accession No .: AM410988.1), and SEQ ID NO: 2 shows only the amino acid sequence.
- isoprene synthase derived from other than plants include those derived from prokaryotes.
- Bacillus subtilis-derived isoprene synthase (Sivy TL. Et al., Biochem. Biophys. Res. Commu. 2002, 294 (1), 71-5) can be mentioned.
- the isoprene synthase used in the present invention may also be modified in addition to the isoprene synthase found and isolated in nature. For example, it may be a partial fragment or amino acid substitution mutant of an existing isoprene synthase and a protein having the activity of isoprene synthase.
- the isoprene synthase used in the present invention includes at least the following proteins (a-1) to (a-3).
- A-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 2
- A-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 2 and having the activity of isoprene synthase
- A-3) A protein having an amino acid sequence showing 90% or more homology with the amino acid sequence represented by SEQ ID NO: 2 and having the activity of isoprene synthase.
- the homology of the amino acid sequence in (a-3) is more preferably 92% or more, still more preferably 95% or more, and particularly preferably 98% or more.
- the cyclic terpene synthase is an enzyme that generates a cyclic terpene using a linear terpene as a substrate.
- the cyclic terpene synthase include cyclic monoterpene synthase, cyclic sesquiterpene synthase, cyclic diterpene synthase, and the like.
- the cyclic monoterpene synthase has an action of cyclizing geranyl diphosphate (GPP) to convert it into a cyclic monoterpene.
- GPP geranyl diphosphate
- ⁇ -ferrandolene synthase which is a kind of ferrandolene synthase, has an activity of converting geranyl diphosphate (GPP) or neryl diphosphate (NPP) into ⁇ -ferrandolene (Patent Document 5).
- ⁇ -ferrandrene synthase and nucleic acid encoding it include those derived from tomato (Solanum lycopersicum) (GenBank Accession No .: FJ797957; Schilmiller, A. L., et al., Proc Natl Acad Sci U S A., 2009, 106, 10865-70.), Derived from Lavandula (Lavandula angustifolia) (GenBank Accession No .: HQ404305; Demissie, Z. A., et al., Planta, 2011 ,. 233, 685- 96), and the like.
- SEQ ID NO: 3 shows the amino acid sequence corresponding to the nucleotide sequence of the nucleic acid (DNA) encoding the lavender-derived ⁇ -ferrandrene synthase
- SEQ ID NO: 4 shows only the amino acid sequence.
- the DNA having the base sequence represented by SEQ ID NO: 3 is an example of a nucleic acid encoding ⁇ -ferrandrene synthase (cyclic monoterpene synthase).
- the cyclic sesquiterpene synthase has an action of cyclizing farnesyl diphosphate (FPP) to convert it into a cyclic sesquiterpene.
- FPP farnesyl diphosphate
- An example of a cyclic sesquiterpene synthase is trichodiene synthase.
- SEQ ID NO: 5 shows the amino acid sequence corresponding to the base sequence of the nucleic acid (DNA) encoding Tricodiene synthase derived from Fusarium poae
- SEQ ID NO: 6 shows only the amino acid sequence.
- the DNA having the base sequence represented by SEQ ID NO: 5 is an example of a nucleic acid encoding a trichodiene synthase (cyclic sesquiterpene synthase).
- the cyclic diterpene synthase has an action of cyclizing geranylgeranyl diphosphate (GGPP) to convert it into a cyclic diterpene.
- GGPP geranylgeranyl diphosphate
- the cyclic terpene synthase used in the present invention may also be a modified form of these other than the cyclic terpene synthase found and isolated in nature.
- it may be a partial fragment of an existing cyclic terpene enzyme or an amino acid substitution mutant and a protein having the activity of a cyclic terpene synthase.
- the cyclic monoterpene synthase used in the present invention includes at least one of the following proteins (b-1) to (b-3).
- B-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 4,
- B-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 4 and having the activity of ⁇ -ferrandrene synthase
- B-3) A protein having an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 4 and having the activity of ⁇ -ferrandrene synthase.
- the homology of the amino acid sequence in (b-3) is more preferably 92% or more, still more preferably 95% or more, and particularly preferably 98% or more.
- the cyclic sesquiterpene synthase used in the present invention includes at least one of the following proteins (c-1) to (c-3).
- (C-1) a protein comprising the amino acid sequence represented by SEQ ID NO: 6,
- (C-2) a protein comprising an amino acid sequence in which 1 to 20 amino acids are deleted, substituted or added in the amino acid sequence represented by SEQ ID NO: 6, and having activity of trichodiene synthase
- C-3) a protein having an amino acid sequence having 90% or more homology with the amino acid sequence represented by SEQ ID NO: 6 and having tricodiene synthase activity.
- the homology of the amino acid sequence in (c-3) is more preferably 92% or more, further preferably 95% or more, and particularly preferably 98% or more.
- the FKBP family protein may be linked to the N-terminal side of the first protein, or the FKBP family protein may be linked to the C-terminal side of the first protein.
- the first protein and the FKBP family protein may be directly linked or may be linked via a peptide linker or the like.
- peptide linker for example, a peptide linker composed of about 10 to 50 structurally flexible amino acid sequences, for example, a peptide linker composed of an amino acid sequence repeating structure consisting of 4 glycines and 1 serine is used. Is possible.
- the fusion protein may further have a secretion signal.
- secretory signal By giving a secretory signal, secretory expression is possible when expressed in a host cell.
- the present invention includes a fusion protein encoded by the nucleic acid, that is, a fusion protein in which a first protein (isoprene synthase or cyclic terpene synthase) and an FKBP family protein are linked.
- the present invention includes a recombinant cell that is a bacterium, has a nucleic acid encoding the fusion protein, and expresses the fusion protein.
- the present invention is also a recombinant cell which is a bacterium, and has a first nucleic acid encoding a first protein (isoprene synthase or cyclic terpene synthase) and a second nucleic acid encoding an FKBP family protein, And a recombinant cell expressing the isoprene synthase or cyclic terpene synthase and the FKBP family protein.
- the present invention provides a recombinant cell which is a bacterium, comprising a first nucleic acid encoding an isoprene synthase and a second nucleic acid encoding an FKBP family protein, and comprising the isoprene synthase and the FKBP family protein.
- a recombinant cell which is a bacterium, comprising a first nucleic acid encoding an isoprene synthase and a second nucleic acid encoding an FKBP family protein, and comprising the isoprene synthase and the FKBP family protein.
- isoprene synthase or cyclic terpene synthase is stabilized by the presence of adjacent or coexisting FKBP family proteins.
- the recombinant cell of the present invention can be obtained, for example, by introducing the nucleic acid into a host cell that is a bacterium.
- prokaryotes such as bacteria have the ability to synthesize isopentenyl diphosphate (IPP) by the non-mevalonate pathway (MEP pathway).
- IPP isopentenyl diphosphate
- MEP pathway non-mevalonate pathway
- isopentenyl diphosphate isomerase is present in all living organisms. Therefore, the recombinant cell of the present invention can convert DMAPP converted from IPP into isoprene. That is, the recombinant cell of the present invention can produce isoprene.
- the recombinant cell of the present invention can convert geranyl diphosphate (GPP), farnesyl diphosphate (FPP), geranylgeranyl diphosphate (GGPP), etc., which uses IPP as a precursor, into a cyclic terpene. . That is, the recombinant cell of the present invention can produce a cyclic terpene.
- GPP geranyl diphosphate
- FPP
- the host cell is not particularly limited as long as it is a bacterium.
- bacteria generally used as hosts for expressing foreign genes such as Escherichia coli and Bacillus subtilis, can also be applied in the present invention.
- bacteria having the ability to assimilate C1 compounds can be used as host cells.
- bacteria having the ability to assimilate carbon monoxide, carbon dioxide, methane, methanol, methylamine, formic acid, formamide, and the like can be used as host cells.
- a recombinant cell having the ability to assimilate C1 compounds such as carbon monoxide, carbon dioxide, methane, methanol, methylamine, formic acid, and formamide can be obtained.
- bacteria having the ability to assimilate carbon monoxide or carbon dioxide can be used as host cells.
- a recombinant cell having the ability to assimilate carbon monoxide or carbon dioxide can be obtained.
- the host cell is specifically an anaerobic prokaryotic cell, and in particular, an anaerobic prokaryotic cell having a function of synthesizing acetyl CoA from methyltetrahydrofolate, carbon monoxide, and CoA.
- anaerobic prokaryotic cells further having carbon monoxide dehydrogenase (EC 1.2.99.2) are preferred.
- anaerobic prokaryotic cells that grow mainly by carbon monoxide metabolism, that is, by the function of carbon monoxide dehydrogenase to generate carbon dioxide and protons from carbon monoxide and water are preferred.
- Examples of such anaerobic prokaryotic cells include anaerobic prokaryotic cells having an acetyl-CoA pathway (Wood-Ljungdahl pathway) and a methanol pathway (Methanol pathway) shown in FIG.
- anaerobic prokaryotic cells include Clostridium ljungdahlii, Clostridium autoethanogenumn, Clostridium carboxidivorans, Clostridium ragsdalei (Kopke M. et al., Appl. Environ. Microbiol. 2011, 77 (15), 4675467-5ther) (Same as Clostridium thermoaceticum) (Pierce EG. Et al., Environ. Microbiol. 2008, ⁇ 10, 2550-2573), etc., and Clostridium genus bacteria or Moorella genus bacteria.
- Clostridium bacteria have established host-vector systems and culture methods, and are suitable as host cells in the recombinant cells of the present invention.
- the above five Clostridium bacteria or Moorella bacteria are known as representative examples of syngas assimilating microorganisms.
- prokaryotic cells such as Carboxydocella sporoducens sp.ovNov., Rhodopseudomonas gelatinosa, Eubacterium limosum, Butyribacterium methylotrophicum, etc. can be used as host cells.
- a methanol-utilizing bacterium that is a kind of methylotroph can be used as a host cell. Thereby, a recombinant cell having the ability to assimilate methanol can be obtained.
- a methylotroph is a generic name for C1-compound-assimilating microorganisms that use carbon compounds that do not have C—C bonds in their molecules, such as methane, methanol, methylamine, dimethylamine, and trimethylamine, as the only carbon source and energy source.
- Microorganisms called methanotroph, methane oxidizing bacteria, methanol-assimilating bacteria, methanol-assimilating yeast, methanol-assimilating microorganisms, etc. all belong to methylotrophs.
- Mesanotrophs can convert methane to methanol by the action of methane monooxidase and catabolize methanol with the same metabolism as methyl trough.
- Methylotroph uses the reaction of converting formaldehyde to organic matter having a C—C bond after converting methanol to formaldehyde as the central metabolism.
- the carbon assimilation metabolic pathway via formaldehyde the serine pathway, ribulose monophosphate pathway (RuMP pathway), and xylulose monophosphate pathway (XuMP pathway) shown in FIG. 2 are known.
- Methanol-assimilating bacteria that can be used in the present invention possess a serine cycle or a RuMP pathway.
- Methylotroph has a function of converting methanol and / or formic acid into formaldehyde and a formaldehyde fixing ability.
- Examples of the methanol-assimilating bacteria include Methylacidphilum, Methylosinus, Methylocystis, Methylobacterium, Methylocella, Methylococcus, Methylomonas, Methylobacter, Methylobacillus, Methylophilus, Methylovotenera, Methylovorus, Methylomicrobium, Methylophaga, Methylophilaceae, Methyloversatilis, Mycobacterium, Arthrobacter, Bacillus, Beggiatoa, Burkholderia, Granulibacter, Hyphomicrobium, Pseudomonas, Achromobactor, Paracoccus, Renothrix, R And methylotrophs belonging to the genus Silicibacter, Thiomicrospira, Verrucomicrobia, and the like.
- a method for introducing a gene into a host cell may be appropriately selected depending on the type of the host cell and the like.
- a method for introducing a target gene with a self-replicating plasmid (vector) or a genome introduction method can be employed. is there.
- a self-replicating plasmid capable of being introduced into a host cell and expressing an integrated nucleic acid
- a vector capable of being introduced into a host cell and expressing an integrated nucleic acid
- a vector that can replicate autonomously in a host cell or can be integrated into a chromosome and contains a promoter at a position where the inserted nucleic acid (DNA) can be transcribed can be used.
- DNA nucleic acid
- each nucleic acid when a plurality of types of nucleic acids are introduced into a host cell using a vector, each nucleic acid may be incorporated into one vector or may be incorporated into separate vectors. Furthermore, when incorporating multiple types of nucleic acids into one vector, each nucleic acid may be expressed under a common promoter or may be expressed under separate promoters.
- an embodiment (co-expression) in which a nucleic acid encoding an FKBP family protein and a nucleic acid encoding an isoprene synthase or a cyclic terpene synthase are introduced.
- Examples of self-replicating vectors that can be used when the host is Escherichia coli include commercially available pET (Novagen), pBAD (Life Technologies), and pGEM (Promega).
- pAYC32 Choistoserdov AY., Et al., Plasmid 1986, 16, 161-167
- pRP301 Lismid 1986, 16, 161-167
- pBBR1 pBHR1
- pCM80 Marx CJ.
- genome introduction methods include homologous recombination, transposon method (Martinerz-Garcia E. et al., BMC Microbiol. 11:38), integrase method (Miyazaki, R. et al., Appl. Environ. Microbiol. 2014). , 79 (14), 4440-4447), Cre / loxP method (Bertram, ramR. Et al., J. Mol. Microbiol. Biotechnol. 2009, 17 (3), 136-145), Flp / FRT method (Al -Hinai, MA. Et al., Appl. Environ. Microbiol. 2012, 78 (22), 8112-8121).
- nucleic acids may be introduced into the recombinant cells.
- a nucleic acid encoding an enzyme (group) that acts in a mevalonate pathway (MVA pathway) or a non-mevalonate pathway (MEP pathway), which is a synthesis pathway of isopentenyl diphosphate (IPP) can be introduced.
- MVA pathway mevalonate pathway
- MEP pathway non-mevalonate pathway
- IPP isopentenyl diphosphate
- the method for culturing the recombinant cell of the present invention is not particularly limited, and it can be cultured using a medium in which the recombinant cell can grow.
- a medium in which the recombinant cell can grow For example, when the host is a heterotrophic microorganism such as Escherichia coli or Bacillus subtilis, a carbon source such as glucose or saccharose can be used.
- a methanol-assimilating bacterium it is preferable to use a medium containing 0.1 to 5.0% (v / v) methanol.
- the host is a syngas-utilizing bacterium, the following composition can be used as the carbon source and energy source.
- a saccharide carbon source such as glucose or saccharose may be added and cultured as necessary.
- any culture method such as batch type, fed-batch type or continuous type can be applied.
- fed-batch or continuous culture it is possible to further increase the cell density by semipermeable membrane circulation of the culture solution.
- the present invention includes a method for producing isoprene or a cyclic terpene, wherein the above recombinant cell is contacted with a gas containing carbon dioxide and hydrogen, and the recombinant cell is produced from carbon dioxide to produce isoprene or a cyclic terpene. Furthermore, the present invention provides an isoprene or a ring in which a gas containing carbon monoxide, carbon dioxide and hydrogen is brought into contact with the recombinant cell, and the recombinant cell produces isoprene or a cyclic terpene from carbon monoxide and carbon dioxide. Includes production methods of formula terpenes.
- the above gas is contacted with a recombinant cell having an anaerobic prokaryotic cell having a function of synthesizing acetyl CoA from methyl tetrahydrofolate, carbon monoxide, and CoA as described above, and isoprene or ring Formula terpenes can be produced.
- recombinant cells can be cultured using the gas as a carbon source, and isoprene or cyclic terpenes can be isolated from the culture.
- it is possible to produce isoprene or cyclic terpenes by bringing the above-mentioned gas into contact with a recombinant cell regardless of the presence or absence of cell growth.
- the gas can be continuously supplied to the immobilized recombinant cells to continuously produce isoprene or cyclic terpenes.
- Isoprene or cyclic terpenes produced by recombinant cells can be recovered from the extracellular gas phase, for example.
- the recovery method for example, a solid phase adsorption method or a solvent absorption method can be employed.
- the recombinant cells of the present invention are cultured not for the purpose of producing isoprene or cyclic terpenes but exclusively for the purpose of increasing the number of cells or for obtaining the fusion protein itself, the above gas is used as a carbon source. There is no need.
- the recombinant cells may be cultured using other carbon sources such as saccharides and glycerin as described above.
- Example 1 E. coli BL21 strain (Lon -, OmpT -) expression and isoprene production of FKBP-IspS fusion protein in
- An artificially synthesized gene represented by SEQ ID NO: 9 was prepared.
- This artificially synthesized gene includes a gene encoding a fusion protein of Thermococcus-derived FKBP and populus (Populus nigra) -derived isoprene synthase (IspS), and isopentenyl diphosphate isomerase (IDI) derived from actinomycetes. Contains the encoding gene.
- the FKBP-IspS fusion protein is designed to be provided with a tag sequence consisting of 6 histidines at the C-terminus.
- This artificially synthesized gene was introduced into NdeI and BamHI cleavage sites of the pET-3a vector to construct an expression vector pTFKIS.
- pTFKIS was introduced into E. coli strain BL21 (Lon ⁇ , OmpT ⁇ ) to obtain a recombinant.
- This recombinant was cultured at 30 ° C. in 2 ⁇ YT medium containing ampicillin at a concentration of 100 ⁇ g / mL.
- 5 mL of the culture solution was transferred into TORAST HS 20 ml vial (Shimadzu Corporation) sealed with a septum cap, 0.1 mMmIPTG was added, and the culture was further continued at 30 ° C for 20 hours.
- headspace sampling measurement was performed with GCMS QP2010 ultra (Shimadzu Corporation).
- the GC column used was ZB-624 (phenomenex: film thickness 1.40 ⁇ m / length 30.0 m / inner diameter 0.25 mm).
- the amount of isoprene produced per dry cell weight (g) was calculated.
- the cells were collected after completion of the culture, and the cell disruption solution obtained by ultrasonication was separated into a supernatant (soluble fraction) and a precipitate fraction by centrifugation. Both of these fractions were subjected to electrophoresis, and the expression of the FKBP-IspS fusion protein was confirmed by Western blotting using an anti-6 histag antibody (GE Healthcare). The expression level was evaluated by evaluating the color development intensity by antibody staining in 6 levels of 0-5.
- Example 1 An experiment similar to that of Example 1 was performed using IspS alone instead of the FKBP-IspS fusion protein.
- An artificially synthesized gene (DNA) represented by SEQ ID NO: 10 was prepared.
- This artificially synthesized gene contains a gene encoding Poplar-derived IspS and a gene encoding Actinomyces-derived isopentenyl diphosphate isomerase (IDI), but does not include the FKBP gene. It is also designed so that a tag sequence consisting of 6 histidines is provided at the C-terminal of IspS.
- This artificially synthesized gene was introduced into the NdeI and BamHI cleavage sites of the pET-3a vector to construct an expression vector pTIS.
- pTFKIS was introduced into E. coli strain BL21 (Lon ⁇ , OmpT ⁇ ) to obtain a recombinant.
- the recombinants were cultured in the same manner as in Example 1. Further, headspace sampling measurement was performed in the same manner as in Example 1. Furthermore, the expression of IspS was confirmed by Western blotting.
- an artificially synthesized gene represented by SEQ ID NO: 11 was prepared.
- this artificially synthesized gene includes a gene encoding a fusion protein of Thermococcus-derived FKBP and poplar-derived IspS, and a gene encoding actinomycete-derived IDI, and further derived from C. ljungdahlii These genes are designed to be induced by the pta (Phosphotransacetylase) promoter. Further, the FKBP-IspS fusion protein is designed to be provided with a tag sequence consisting of 6 histidines at the C-terminus.
- This artificially synthesized gene was introduced into the TspMI and BspEI cleavage sites of the pSKCL vector (FIG. 3, SEQ ID NO: 13) to construct an expression vector pSCLFKIS.
- pSCLFKIS was introduced into C. ljungdahlii (DSM13528) strain to obtain a recombinant.
- Example 2 An experiment similar to that of Example 2 was performed using IspS alone instead of the FKBP-IspS fusion protein.
- An artificially synthesized gene (DNA) represented by SEQ ID NO: 12 was prepared.
- This artificially synthesized gene includes a gene encoding IspS derived from Populus nigra and a gene encoding isopentenyl diphosphate isomerase (IDI) derived from actinomycetes, but does not include the FKBP gene. It is also designed to induce the expression of these genes by the pta promoter from C. ljungdahlii.
- the FKBP-IspS fusion protein is designed to be provided with a tag sequence consisting of 6 histidines at the C-terminus.
- This artificially synthesized gene was introduced into the TspMI and BspEI cleavage sites of the pSKCL vector (FIG. 3) to construct an expression vector pSCLIS.
- pSCLIS was introduced into C. ljungdahlii (DSM13528) strain to obtain a recombinant.
- the recombinant was cultured in the same manner as in Example 2. Further, the head space sampling measurement was performed in the same manner as in Example 2. Furthermore, the expression of IspS was confirmed by Western blotting.
- Example 2 The results are shown in Table 2. That is, the amount of isoprene produced in the C. ljungdahlii recombinant into which the gene encoding the fusion protein of FKBP and IspS was introduced (Example 2) was 2963 ⁇ g / g dry cells, and the non-fusion IspS gene was introduced. The amount of isoprene produced by the recombinant C. ljungdahlii recombinant (Comparative Example 2) (0.50 ⁇ g / g dry cells) was significantly higher.
- M. extorquens possesses an enzyme that synthesizes geranyl diphosphate (GPP), which is a substrate for ⁇ -ferrandrene synthase, from isopentenyl diphosphate (IPP). Therefore, it was considered that ⁇ -ferrandolene synthesis from methanol would be possible by introducing the ⁇ -ferrandrene synthase gene into this strain and expressing the gene.
- GPP geranyl diphosphate
- IPP isopentenyl diphosphate
- An artificially synthesized gene (DNA) represented by SEQ ID NO: 14 was prepared.
- This artificially synthesized gene contains a gene encoding a fusion protein of Thermococcus-derived FKBP and lavender-derived ⁇ -ferrandrene synthase (bPHS), and gene expression is induced by the pta promoter used in Example 2. Is designed to be.
- This artificially synthesized gene was introduced into the BamHI / KpnI site of pCM80 (Marx CJ. Et al., Microbiology 2001, 147, 2065-2075), which is a broad host range vector of SEQ ID NO: 15 to prepare pC80FkPHS.
- the expression vector pCM80FkPHS was introduced into M. extorquens by electroporation to obtain a ME-FkPHS strain.
- the ME-FkPHS strain was synthesized with methanol as the sole carbon source (18 g of H 3 PO 4 , 14.28 g of K 2 SO 4 , 3.9 g of KOH, 0.9 g of CaSO 4 .2H 2 O, MgSO 4 per liter).
- M. extorquens into which pCM80 was introduced did not produce ⁇ -ferrandolene at all, but the ME-FkPHS strain produced 7.3 mg / g dry cells of ⁇ -ferrandolene.
- Example 3 The same experiment as in Example 3 was performed using bPHS alone instead of the FKBP-bPHS fusion protein.
- An artificially synthesized gene represented by SEQ ID NO: 16 was prepared.
- This artificially synthesized gene includes a gene encoding only lavender-derived ⁇ -ferrandrene synthase (bPHS), and is designed so that the expression of the gene is induced by the pta promoter used in Example 3. Yes.
- This artificially synthesized gene was introduced into the BamHI / KpnI site of pCM80 used in Example 3 to prepare pC80PHS.
- the expression vector pCM80PHS was introduced into M. extorquens by electroporation to obtain a ME-PHS strain. This recombinant was cultured in the same manner as in Example 3.
- the production amount of ⁇ -ferrandrene by the ME-PHS strain was 0.4 mg / g dry cells. From the above results, the production amount of ⁇ -ferrandrene could be remarkably increased by fusing FKBP and bPHS in the methylotroph.
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Abstract
Description
(a-1)配列番号2で表されるアミノ酸配列からなるタンパク質、
(a-2)配列番号2で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつイソプレン合成酵素の活性を有するタンパク質、
(a-3)配列番号2で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつイソプレン合成酵素の活性を有するタンパク質。
(b-1)配列番号4で表されるアミノ酸配列からなるタンパク質、
(b-2)配列番号4で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつβ-フェランドレン合成酵素の活性を有するタンパク質、
(b-3)配列番号4で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつβ-フェランドレン合成酵素の活性を有するタンパク質。
(c-1)配列番号6で表されるアミノ酸配列からなるタンパク質、
(c-2)配列番号6で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつトリコジエン合成酵素の活性を有するタンパク質、
(c-3)配列番号6で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつトリコジエン合成酵素の活性を有するタンパク質。
(d-1)配列番号8で表されるアミノ酸配列からなるタンパク質、
(d-2)配列番号8で表されるアミノ酸配列において1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質、
(d-3)配列番号8で表されるアミノ酸配列と相同性が90%以上のアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質。
以下、FKBPファミリータンパク質を単にFKBPと略記することがある。
アーキア由来のロングタイプFKBPファミリータンパク質としては、Pyrococcus horikoshii由来、Aeropyrum pernix由来、Sulfolobus solfataricus由来、Methanococcus jannaschii由来、Archaeoglobus fulgidus由来、Methanobacterium autotrophicum由来、Thermoplasma acidophilum由来、Halobacterium cutirubrum由来、等のものが挙げられる(Maruyama, Front.Biosci. 5, 821-, 2000)。
(d-1)配列番号8で表されるアミノ酸配列からなるタンパク質、
(d-2)配列番号8で表されるアミノ酸配列において1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質、
(d-3)配列番号8で表されるアミノ酸配列と相同性が90%以上のアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質。
なお(d-3)におけるアミノ酸配列の相同性については、より好ましくは92%以上、さらに好ましくは95%以上、特に好ましくは98%以上である。
前記したように、イソプレン合成酵素(EC 4.2.3.27)は、イソペンテニル二リン酸(IPP)の異性体であるジメチルアリル二リン酸(DMAPP)をイソプレンに変換する作用を有する。なお、IPPとDMAPPとの間の構造変換は、イソペンテニル二リン酸イソメラーゼが触媒する。イソペンテニル二リン酸イソメラーゼは全ての生物に存在する。
以下、イソプレン合成酵素をIspSと略記することがある。
(a-1)配列番号2で表されるアミノ酸配列からなるタンパク質、
(a-2)配列番号2で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつイソプレン合成酵素の活性を有するタンパク質、
(a-3)配列番号2で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつイソプレン合成酵素の活性を有するタンパク質。
なお(a-3)におけるアミノ酸配列の相同性については、より好ましくは92%以上、さらに好ましくは95%以上、特に好ましくは98%以上である。
前記したように、環式テルペン合成酵素は、直鎖構造テルペンを基質として環式テルペンを生成させる酵素である。環式テルペン合成酵素の例としては、環式モノテルペン合成酵素、環式セスキテルペン合成酵素、環式ジテルペン合成酵素、等が挙げられる。
(b-1)配列番号4で表されるアミノ酸配列からなるタンパク質、
(b-2)配列番号4で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつβ-フェランドレン合成酵素の活性を有するタンパク質、
(b-3)配列番号4で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつβ-フェランドレン合成酵素の活性を有するタンパク質。
なお(b-3)におけるアミノ酸配列の相同性については、より好ましくは92%以上、さらに好ましくは95%以上、特に好ましくは98%以上である。
(c-1)配列番号6で表されるアミノ酸配列からなるタンパク質、
(c-2)配列番号6で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつトリコジエン合成酵素の活性を有するタンパク質、
(c-3)配列番号6で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつトリコジエン合成酵素の活性を有するタンパク質。
なお(c-3)におけるアミノ酸配列の相同性については、より好ましくは92%以上、さらに好ましくは95%以上、特に好ましくは98%以上である。
また本発明は、細菌である組換え細胞であって、第一タンパク質(イソプレン合成酵素又は環式テルペン合成酵素)をコードする第一核酸とFKBPファミリータンパク質をコードする第二核酸とを有し、かつ前記イソプレン合成酵素又は環式テルペン合成酵素と前記FKBPファミリータンパク質とを発現する組換え細胞を包含する。
さらに本発明は、細菌である組換え細胞であって、イソプレン合成酵素をコードする第一核酸とFKBPファミリータンパク質をコードする第二核酸とを有し、かつ前記イソプレン合成酵素と前記FKBPファミリータンパク質を発現する組換え細胞を包含する。
いずれの組換え細胞においても、隣接または共存するFKBPファミリータンパク質の存在によって、イソプレン合成酵素又は環式テルペン合成酵素が安定化される。
さらに本発明の組換え細胞は、IPPを前駆体とするゲラニル二リン酸(GPP)、ファルネシル二リン酸(FPP)、ゲラニルゲラニル二リン酸(GGPP)等を、環式テルペンに変換することができる。すなわち、本発明の組換え細胞は、環式テルペンを生産することができる。
このような嫌気性原核細胞を宿主細胞として用いることにより、一酸化炭素や二酸化炭素のようなガスを炭素源として、組換え細胞にイソプレンや環式テルペンを生産させることが可能となる。
・CO
・CO/H2
・CO2/H2
・CO/CO2/H2
・CO/HCOOH
・CO2/HCOOH
・CO/CH3OH
・CO2/CH3OH
・CO/H2/HCOOH
・CO2/H2/HCOOH
・CO/H2/CH3OH
・CO2/H2/CH3OH
・CO/CO2/H2/HCOOH
・CO/CO2/H2/CH3OH
・CH3OH/H2
・HCOOH/H2
1つの例としては、上記ガスを炭素源として用いて組換え細胞を培養し、該培養物からイソプレン又は環式テルペンを単離することができる。
その他、細胞増殖の有無にかかわらず、組換え細胞に上記ガスを接触させることにより、イソプレン又は環式テルペンを生産させることができる。例えば、固定化した組換え細胞に上記ガスを連続的に供給し、イソプレン又は環式テルペンを連続的に生産させることができる。
大腸菌BL21株(Lon-, OmpT-)におけるFKBP-IspS融合タンパク質の発現とイソプレン生産
FKBP-IspS融合タンパク質に代えて、IspSを単独で用い、実施例1と同様の実験を行った。
配列番号10で表される人工合成遺伝子(DNA)を作製した。この人工合成遺伝子は、ポプラ由来IspSをコードする遺伝子、並びに、放線菌由来イソペンテニル二リン酸イソメラーゼ(IDI)をコードする遺伝子を含んでいるが、FKBP遺伝子を含んでいない。またIspSのC末端に6個のヒスチジンから成るタグ配列が設けられるよう設計されている。この人工合成遺伝子をpET-3aベクターのNdeI及びBamHI切断部位へ導入し、発現ベクターpTISを構築した。pTFKISを大腸菌BL21株(Lon-, OmpT-)へ導入し、組換え体を取得した。
またIspSの発現(ウエスタンブロッティング発色強度)について、実施例1の組換え体では可溶性画分において十分な量のIspSが認められ、沈殿画分に検出されたIspSは僅かであった。このことから、IspSは、FKBPとの融合により可溶性画分での正常な立体構造を保持した活性型IspSの発現量が増加し、これによりイソプレンの生産量が増加したと考えられた。一方、比較例1の組換え体ではIspSが主に沈殿画分に検出され、可溶性画分には少ししか検出されなかった。
合成ガス資化性菌Clostridium ljungdahliiにおけるFKBP-IspS融合タンパク質の発現とイソプレン生産
また、培養終了後に菌体を回収し、フレンチプレスによって得た菌体破砕液を遠心分離によって上清(可溶性画分)と沈殿画分に分離した。両画分について、実施例1と同様の方法でウエスタンブロッティングによるIspSの発現を確認した。
FKBP-IspS融合タンパク質に代えて、IspSを単独で用い、実施例2と同様の実験を行った。
配列番号12で表される人工合成遺伝子(DNA)を作製した。この人工合成遺伝子は、Populus nigra由来IspSをコードする遺伝子、並びに、放線菌由来イソペンテニル二リン酸イソメラーゼ(IDI)をコードする遺伝子を含んでいるが、FKBP遺伝子を含んでいない。また、C. ljungdahlii由来のptaプロモーターによってこれらの遺伝子の発現が誘導されるよう設計されている。また、FKBP-IspS融合タンパク質のC末端に6個のヒスチジンから成るタグ配列が設けられるよう設計されている。この人工合成遺伝子を、pSKCLベクター(図3)のTspMI及びBspEI切断部位へ導入し、発現ベクターpSCLISを構築した。pSCLISをC. ljungdahlii (DSM13528)株へ導入し、組換え体を取得した。
またIspSの発現(ウエスタンブロッティング発色強度)について、実施例2の組換え体では可溶性画分において十分な量のIspSが認められ、沈殿画分に検出されたIspSは僅かであった。これに対し、比較例2の組換え体ではIspSがほとんど検出されず、沈殿画分に僅かに認められたのみであった。これは、C. ljungdahliiでは非融合のIspSが正常な立体構造をとれず、プロテアーゼにより殆ど分解されてしまうためと考えられた。
以上より、FKBPとIspSとの融合タンパク質をコードする遺伝子が導入されたC. ljungdahlii組換え体を用いることによって、イソプレンの生産量を顕著に向上させることができた。
メチロトローフMethylobacterium extorquensにおけるFKBP-β-フェランドレン融合タンパク質の発現とβ-フェランドレン生産
対照として、pCM80ベクターのみが導入されたM. extorquensについても同様の実験を行った。
FKBP-bPHS融合タンパク質に代えて、bPHSを単独で用い、実施例3と同様の実験を行った。
配列番号16で表される人工合成遺伝子を作製した。この人工合成遺伝子は、ラベンダー由来のβ-フェランドレン合成酵素(bPHS)のみをコードする遺伝子を含んでおり、実施例3で使用されたptaプロモーターによって遺伝子の発現が誘導されるように設計されている。この人工合成遺伝子を、実施例3で使用したpCM80のBamHI/KpnIサイトへ導入し、pC80PHSを作製した。発現ベクターpCM80PHSをエレクトロポレーションによってM. extorquensへ導入し、ME-PHS株を得た。実施例3と同様にして本組換え体の培養を行った。
Claims (35)
- イソプレン合成酵素及び環式テルペン合成酵素からなる群より選択された第一タンパク質とFKBPファミリータンパク質とが連結された融合タンパク質をコードする核酸。
- 前記第一タンパク質が、イソプレン合成酵素である請求項1に記載の核酸。
- 前記イソプレン合成酵素が、下記(a-1)~(a-3)のいずれかである請求項2に記載の核酸。
(a-1)配列番号2で表されるアミノ酸配列からなるタンパク質、
(a-2)配列番号2で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつイソプレン合成酵素の活性を有するタンパク質、
(a-3)配列番号2で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつイソプレン合成酵素の活性を有するタンパク質。 - 前記第一タンパク質が、環式モノテルペン合成酵素である請求項1に記載の核酸。
- 前記環式モノテルペン合成酵素が、フェランドレン合成酵素である請求項4に記載の核酸。
- 前記環式モノテルペン合成酵素が、下記(b-1)~(b-3)のいずれかである請求項4に記載の核酸。
(b-1)配列番号4で表されるアミノ酸配列からなるタンパク質、
(b-2)配列番号4で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつβ-フェランドレン合成酵素の活性を有するタンパク質、
(b-3)配列番号4で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつβ-フェランドレン合成酵素の活性を有するタンパク質。 - 前記第一タンパク質が、環式セスキテルペン合成酵素である請求項1に記載の核酸。
- 前記環式セスキテルペン合成酵素が、下記(c-1)~(c-3)のいずれかである請求項7に記載の核酸。
(c-1)配列番号6で表されるアミノ酸配列からなるタンパク質、
(c-2)配列番号6で表されるアミノ酸配列において、1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつトリコジエン合成酵素の活性を有するタンパク質、
(c-3)配列番号6で表されるアミノ酸配列と90%以上の相同性を示すアミノ酸配列を有し、かつトリコジエン合成酵素の活性を有するタンパク質。 - 前記第一タンパク質が、環式ジテルペン合成酵素である請求項1に記載の核酸。
- 前記第一タンパク質が、原核生物由来のものである請求項1~9のいずれかに記載の核酸。
- 前記FKBPファミリータンパク質が、原核生物由来のものである請求項1~10のいずれかに記載の核酸。
- 前記FKBPファミリータンパク質が、アーキア由来のものである請求項1~10のいずれかに記載の核酸。
- 前記FKBPファミリータンパク質の分子量が2万以下である請求項1~12のいずれかに記載の核酸。
- 前記FKBPファミリータンパク質が、下記(d-1)~(d-3)のいずれかである請求項1~10のいずれかに記載の核酸。
(d-1)配列番号8で表されるアミノ酸配列からなるタンパク質、
(d-2)配列番号8で表されるアミノ酸配列において1~20個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質、
(d-3)配列番号8で表されるアミノ酸配列と相同性が90%以上のアミノ酸配列からなり、かつFKBPファミリータンパク質としての活性を有するタンパク質。 - 前記FKBPファミリータンパク質が、トリガーファクターに属するものである請求項1~10に記載の核酸。
- 前記FKBPファミリータンパク質が前記第一タンパク質のN末端側に連結されている請求項1~15のいずれかに記載の核酸。
- 前記融合タンパク質が、さらに分泌シグナル配列を有する請求項1~16のいずれかに記載の核酸。
- 請求項1~17のいずれかに記載の核酸にコードされた融合タンパク質。
- 細菌である組換え細胞であって、請求項1~17のいずれかに記載の核酸を有し、かつ前記融合タンパク質を発現する組換え細胞。
- 細菌である組換え細胞であって、イソプレン合成酵素及び環式テルペン合成酵素からなる群より選択された第一タンパク質をコードする第一核酸と、FKBPファミリータンパク質をコードする第二核酸とを有し、かつ前記イソプレン合成酵素又は環式テルペン合成酵素と前記FKBPファミリータンパク質とを発現する組換え細胞。
- 前記第一タンパク質がイソプレン合成酵素であり、前記イソプレン合成酵素と前記FKBPファミリータンパク質を発現する請求項20に記載の組換え細胞。
- 前記第一タンパク質が、環式モノテルペン合成酵素である請求項20に記載の組換え細胞。
- 前記環式モノテルペン合成酵素が、フェランドレン合成酵素である請求項22に記載の組換え細胞。
- 前記第一タンパク質が、環式セスキテルペン合成酵素である請求項20に記載の組換え細胞。
- 前記第一タンパク質が、環式ジテルペン合成酵素である請求項20に記載の組換え細胞。
- C1化合物を資化する能力を有する請求項19~25のいずれかに記載の組換え細胞。
- メタノール又はメタンを資化する能力を有する請求項26に記載の組換え細胞。
- 一酸化炭素又は二酸化炭素を資化する能力を有する請求項26に記載の組換え細胞。
- 嫌気性細菌である請求項28に記載の組換え細胞。
- Clostridium属細菌又はMoorella属細菌である請求項29に記載の組換え細胞。
- 請求項26~30のいずれかに記載の組換え細胞に、二酸化炭素と水素とを含むガスを接触させ、当該組換え細胞に二酸化炭素からイソプレン又は環式テルペンを生産させるイソプレン又は環式テルペンの生産方法。
- 前記ガスが、一酸化炭素と二酸化炭素と水素とを含むものであり、前記組換え細胞に一酸化炭素及び二酸化炭素からイソプレン又は環式テルペンを生産させる請求項31に記載のイソプレン又は環式テルペンの生産方法。
- 前記組換え細胞の細胞外に放出されたイソプレン又は環式テルペンを回収する請求項31又は32に記載のイソプレン又は環式テルペンの生産方法。
- 固相吸着法により前記イソプレン又は環式テルペンを回収する請求項33に記載のイソプレン又は環式テルペンの生産方法。
- 溶媒吸収法により前記イソプレン又は環式テルペンを回収する請求項33に記載のイソプレン又は環式テルペンの生産方法。
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JPWO2016129637A1 (ja) | 2017-11-24 |
EP3257941A1 (en) | 2017-12-20 |
US20180023098A1 (en) | 2018-01-25 |
CN108064285A (zh) | 2018-05-22 |
CA2974343A1 (en) | 2016-08-18 |
EP3257941A4 (en) | 2018-07-04 |
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