JP6507318B2 - D−プシコース3−エピメラーゼ及びその塩を含むd−プシコースを製造するための組成物、並びにこれを用いたd−プシコースの製造方法 - Google Patents
D−プシコース3−エピメラーゼ及びその塩を含むd−プシコースを製造するための組成物、並びにこれを用いたd−プシコースの製造方法 Download PDFInfo
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- JP6507318B2 JP6507318B2 JP2018532426A JP2018532426A JP6507318B2 JP 6507318 B2 JP6507318 B2 JP 6507318B2 JP 2018532426 A JP2018532426 A JP 2018532426A JP 2018532426 A JP2018532426 A JP 2018532426A JP 6507318 B2 JP6507318 B2 JP 6507318B2
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- psicose
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- fructose
- epimerase
- producing
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- BJHIKXHVCXFQLS-PUFIMZNGSA-N D-psicose Chemical compound OC[C@@H](O)[C@@H](O)[C@@H](O)C(=O)CO BJHIKXHVCXFQLS-PUFIMZNGSA-N 0.000 title claims description 62
- 150000003839 salts Chemical class 0.000 title claims description 26
- 108030002106 D-psicose 3-epimerases Proteins 0.000 title claims description 22
- 239000000203 mixture Substances 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title description 19
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 claims description 54
- 238000006243 chemical reaction Methods 0.000 claims description 46
- RFSUNEUAIZKAJO-VRPWFDPXSA-N D-Fructose Natural products OC[C@H]1OC(O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-VRPWFDPXSA-N 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 35
- 102000004190 Enzymes Human genes 0.000 claims description 29
- 108090000790 Enzymes Proteins 0.000 claims description 29
- 150000004645 aluminates Chemical class 0.000 claims description 16
- ICIWUVCWSCSTAQ-UHFFFAOYSA-M iodate Chemical compound [O-]I(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-M 0.000 claims description 16
- LKDRXBCSQODPBY-JDJSBBGDSA-N D-allulose Chemical compound OCC1(O)OC[C@@H](O)[C@@H](O)[C@H]1O LKDRXBCSQODPBY-JDJSBBGDSA-N 0.000 description 27
- 235000002639 sodium chloride Nutrition 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 24
- 229930091371 Fructose Natural products 0.000 description 20
- 239000005715 Fructose Substances 0.000 description 20
- 108090001066 Racemases and epimerases Proteins 0.000 description 17
- 102000004879 Racemases and epimerases Human genes 0.000 description 17
- 108090000623 proteins and genes Proteins 0.000 description 12
- 125000003275 alpha amino acid group Chemical group 0.000 description 10
- 102000004169 proteins and genes Human genes 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 9
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 238000002425 crystallisation Methods 0.000 description 8
- 239000008103 glucose Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 235000000346 sugar Nutrition 0.000 description 7
- 238000004128 high performance liquid chromatography Methods 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000006911 enzymatic reaction Methods 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 3
- 238000004587 chromatography analysis Methods 0.000 description 3
- 238000009396 hybridization Methods 0.000 description 3
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 3
- 229920001184 polypeptide Polymers 0.000 description 3
- 102000004196 processed proteins & peptides Human genes 0.000 description 3
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- PKAUICCNAWQPAU-UHFFFAOYSA-N 2-(4-chloro-2-methylphenoxy)acetic acid;n-methylmethanamine Chemical compound CNC.CC1=CC(Cl)=CC=C1OCC(O)=O PKAUICCNAWQPAU-UHFFFAOYSA-N 0.000 description 2
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 description 2
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 2
- 241000589155 Agrobacterium tumefaciens Species 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 2
- 241000080590 Niso Species 0.000 description 2
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004042 decolorization Methods 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000006317 isomerization reaction Methods 0.000 description 2
- 239000012139 lysis buffer Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 235000013379 molasses Nutrition 0.000 description 2
- 150000002772 monosaccharides Chemical class 0.000 description 2
- JLKDVMWYMMLWTI-UHFFFAOYSA-M potassium iodate Chemical compound [K+].[O-]I(=O)=O JLKDVMWYMMLWTI-UHFFFAOYSA-M 0.000 description 2
- 235000006666 potassium iodate Nutrition 0.000 description 2
- 239000001230 potassium iodate Substances 0.000 description 2
- 229940093930 potassium iodate Drugs 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000005720 sucrose Substances 0.000 description 2
- HUEXNHSMABCRTH-UHFFFAOYSA-N 1h-imidazole Chemical compound C1=CNC=N1.C1=CNC=N1 HUEXNHSMABCRTH-UHFFFAOYSA-N 0.000 description 1
- FWMNVWWHGCHHJJ-SKKKGAJSSA-N 4-amino-1-[(2r)-6-amino-2-[[(2r)-2-[[(2r)-2-[[(2r)-2-amino-3-phenylpropanoyl]amino]-3-phenylpropanoyl]amino]-4-methylpentanoyl]amino]hexanoyl]piperidine-4-carboxylic acid Chemical compound C([C@H](C(=O)N[C@H](CC(C)C)C(=O)N[C@H](CCCCN)C(=O)N1CCC(N)(CC1)C(O)=O)NC(=O)[C@H](N)CC=1C=CC=CC=1)C1=CC=CC=C1 FWMNVWWHGCHHJJ-SKKKGAJSSA-N 0.000 description 1
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- 208000004611 Abdominal Obesity Diseases 0.000 description 1
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- 229920000936 Agarose Polymers 0.000 description 1
- 206010065941 Central obesity Diseases 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 241000186226 Corynebacterium glutamicum Species 0.000 description 1
- 241001198387 Escherichia coli BL21(DE3) Species 0.000 description 1
- 108060003951 Immunoglobulin Proteins 0.000 description 1
- 241001430110 Kaistia granuli Species 0.000 description 1
- 102000016349 Myosin Light Chains Human genes 0.000 description 1
- 108010067385 Myosin Light Chains Proteins 0.000 description 1
- 101710163270 Nuclease Proteins 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 108700040099 Xylose isomerases Proteins 0.000 description 1
- 210000000577 adipose tissue Anatomy 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229960000723 ampicillin Drugs 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 239000006227 byproduct Substances 0.000 description 1
- 239000000679 carrageenan Substances 0.000 description 1
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- 239000000969 carrier Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
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- 238000001962 electrophoresis Methods 0.000 description 1
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- 238000006345 epimerization reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- -1 for example Chemical class 0.000 description 1
- 238000001640 fractional crystallisation Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- BJHIKXHVCXFQLS-UYFOZJQFSA-N fructose group Chemical group OCC(=O)[C@@H](O)[C@H](O)[C@H](O)CO BJHIKXHVCXFQLS-UYFOZJQFSA-N 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
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- 238000006460 hydrolysis reaction Methods 0.000 description 1
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- AQFQAXAQGPZDRV-UHFFFAOYSA-N iodic acid Chemical compound I(=O)(=O)O.I(=O)(=O)O AQFQAXAQGPZDRV-UHFFFAOYSA-N 0.000 description 1
- BPHPUYQFMNQIOC-NXRLNHOXSA-N isopropyl beta-D-thiogalactopyranoside Chemical compound CC(C)S[C@@H]1O[C@H](CO)[C@H](O)[C@H](O)[C@H]1O BPHPUYQFMNQIOC-NXRLNHOXSA-N 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/02—Monosaccharides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H3/00—Compounds containing only hydrogen atoms and saccharide radicals having only carbon, hydrogen, and oxygen atoms
- C07H3/02—Monosaccharides
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/20—Bacteria; Culture media therefor
- C12N1/205—Bacterial isolates
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1205—Phosphotransferases with an alcohol group as acceptor (2.7.1), e.g. protein kinases
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/90—Isomerases (5.)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/24—Preparation of compounds containing saccharide radicals produced by the action of an isomerase, e.g. fructose
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12R—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES C12C - C12Q, RELATING TO MICROORGANISMS
- C12R2001/00—Microorganisms ; Processes using microorganisms
- C12R2001/01—Bacteria or Actinomycetales ; using bacteria or Actinomycetales
- C12R2001/15—Corynebacterium
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y207/00—Transferases transferring phosphorus-containing groups (2.7)
- C12Y207/01—Phosphotransferases with an alcohol group as acceptor (2.7.1)
- C12Y207/01101—Tagatose kinase (2.7.1.101)
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Genetics & Genomics (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- General Engineering & Computer Science (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Tropical Medicine & Parasitology (AREA)
- Virology (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Enzymes And Modification Thereof (AREA)
Description
D−プシコースは甘味料として関心が高まっているが、自然界に極少量だけ存在する単糖類の希少糖に属するので、食品産業に適用するためにはプシコースを効率的に生産する技術の開発が必要である。
アグロバクテリウム・ツメファシエンスから由来したプシコースエピメラーゼの変異体を発現する組換え菌株として、公知(韓国登録特許第10−1455759号)のコリネバクテリウム・グルタミカム(KCCM11403P)を用いて酵素転換反応を行った。0.1Mのフルクトースを水に溶解させた後、10mMのMnCl2を添加して酵素転換反応のための原料を製造し、これに前記菌株[20%(w/w)]を添加してpH8.0、55℃の条件で3時間反応を進めた。
カイスティア・グラヌリから由来したプシコースエピメラーゼを用いて酵素転換反応を行った。前記酵素は配列番号4のプシコースエピメラーゼを発現する組換え菌株[(E.coli BL21(DE3)/KGDPE(KCCM11918P)]を5mlのLB−アンピシリン(ampicilline)培地(Difco)にそれぞれ接種し、600nmにおける吸光度が1.5になるまで37℃、200rpmで振とう培養した後、この培養液を500mlのLB−アンピシリン培地に接種して本培養を行った。その後、D−プシコース3−エピメラーゼの過発現を誘導するため600nmにおける吸光度が0.7になるとき、0.5mMのIPTGを添加して、16°C、150rpmで調整して16時間培養して酵素を大量発現させた。発現された酵素を精製するために、8000rpmで20分間遠心分離して菌体のみを回収して0.85%(w/v)NaClで2回洗浄し、溶解緩衝液(lysis buffer、50mM Tris−HCl、pH7.0、300mM NaCl)に混濁させた後、音波振動機を用いて4℃で20分間破砕した。前記破砕液を13,000rpmと4℃で20分間遠心分離して上澄み液を回収した後、予め溶解緩衝液で平衡させたNi−NTAカラム(Ni−NTA Superflow、Qiagen)に適用させた後、20mMのイミダゾール(imidazole)と250mMのイミダゾールを含まれた緩衝溶液(50mM Tris−HCl、300mM NaCl、pH7.0)を順次に流して精製された酵素を得て、SDS−PAGEで酵素の単量体のサイズが約32kDaであることを確認した。
前記比較例1のフルクトースを含有する原料に含まれるフルクトースの濃度(0.1M、1.7Mおよび2.8M)を調整し、前記原料の各々に0.05M、0.85M、1.4Mのアルミン酸ナトリウム(NaAlO2)をそれぞれ添加し、比較例1と同じ条件でD−プシコースへの転換反応を行い、転換率も比較例1と同様に分析した。
前記比較例2において0.1Mフルクトースを含有する酵素反応液に50mMのアルミン酸ナトリウム(NaAlO2)を添加して、比較例2と同じ条件でD−プシコースへの転換反応を行い、転換率も比較例2と同様に分析した。
前記比較例1において0.1Mフルクトースを含有する原料に25mMのヨウ素酸カリウム(KIO3)を添加し比較例1と同じ条件でD−プシコースへの転換反応を行い、転換率も比較例1と同様に分析した。
前記比較例2において0.1Mフルクトースを含有する酵素反応液に25mMのヨウ素酸カリウム(KIO3)を添加し比較例1と同じ条件でD−プシコースへの転換反応を行い、転換率も比較例1と同様に分析した。
Claims (5)
- (a)D−プシコース3−エピメラーゼ、前記酵素を発現する菌株又は前記菌株の培養物、および(b)アルミン酸塩(aluminate)及びヨウ素酸塩(iodate)からなる群より選択される一つ以上の塩を含むD−プシコースを生産するための組成物。
- 前記組成物はD−フルクトースをさらに含むことを特徴とする、請求項1に記載の組成物。
- (a)D−プシコース3−エピメラーゼ、前記酵素を発現する菌株又は前記菌株の培養物に、(b)アルミン酸塩(aluminate)及びヨウ素酸塩(iodate)からなる群より選択される一つ以上の塩を添加するステップを備える、D−フルクトースからD−プシコースを製造する方法。
- (a)D−プシコース3−エピメラーゼ、前記酵素を発現する菌株又は前記菌株の培養物に、(b)アルミン酸塩(aluminate)及びヨウ素酸塩(iodate)からなる群より選択される一つ以上の塩を添加するステップを備えて、D−プシコース3−エピメラーゼによるD−フルクトースからD−プシコースへの転換率を高める方法。
- 前記方法は、前記塩の添加前、添加後、または添加と同時に、D−フルクトースを添加するステップをさらに備えることを特徴とする、請求項3又は4に記載の方法。
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