JP2017093465A - 水素細菌の代謝制御方法 - Google Patents
水素細菌の代謝制御方法 Download PDFInfo
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- JP2017093465A JP2017093465A JP2017012217A JP2017012217A JP2017093465A JP 2017093465 A JP2017093465 A JP 2017093465A JP 2017012217 A JP2017012217 A JP 2017012217A JP 2017012217 A JP2017012217 A JP 2017012217A JP 2017093465 A JP2017093465 A JP 2017093465A
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- acid
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- hydrogenobacter
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- BSIUFWMDOOFBSP-UHFFFAOYSA-N 2-azanylethanol Chemical compound NCCO.NCCO BSIUFWMDOOFBSP-UHFFFAOYSA-N 0.000 description 1
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- 241000186063 Arthrobacter Species 0.000 description 1
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- 241000588724 Escherichia coli Species 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 241000193404 Hydrogenibacillus schlegelii Species 0.000 description 1
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- 241000187484 Mycobacterium gordonae Species 0.000 description 1
- MMOXZBCLCQITDF-UHFFFAOYSA-N N,N-diethyl-m-toluamide Chemical compound CCN(CC)C(=O)C1=CC=CC(C)=C1 MMOXZBCLCQITDF-UHFFFAOYSA-N 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 101100091878 Plasmodium falciparum (isolate 3D7) rpoC2 gene Proteins 0.000 description 1
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- GUGOEEXESWIERI-UHFFFAOYSA-N Terfenadine Chemical class C1=CC(C(C)(C)C)=CC=C1C(O)CCCN1CCC(C(O)(C=2C=CC=CC=2)C=2C=CC=CC=2)CC1 GUGOEEXESWIERI-UHFFFAOYSA-N 0.000 description 1
- 241000051160 Thermus thermophilus HB27 Species 0.000 description 1
- HDTRYLNUVZCQOY-WSWWMNSNSA-N Trehalose Natural products O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 HDTRYLNUVZCQOY-WSWWMNSNSA-N 0.000 description 1
- 241000589494 Xanthobacter autotrophicus Species 0.000 description 1
- 241000589495 Xanthobacter flavus Species 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
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- 125000001145 hydrido group Chemical group *[H] 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 239000013028 medium composition Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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Landscapes
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
【解決手段】培地中の水素細菌に対し、酸化体と還元体の両形態をとり得る電子媒体物質を介して電子の供給を行いながら、水素と二酸化炭素と水素細菌の最終電子受容体として機能する物質とを与えて培養を行うようにした。また、このようにして水素細菌を培養する工程を含むことによって、有用物質を生産するようにした。
【選択図】図1
Description
(A)アミノ酸
・γ−アミノ酪酸(GABA)
・アスパラギン酸
・トリプトファン
・オルニチン
・アルギニン
・グルタミン酸
(B)カルボン酸
・5−オキソヘキサン酸
・2−ヒドロキシ吉草酸
・乳酸
・m−トルイル酸
・2−フランカルボン酸
・安息香酸
・リンゴ酸
・3−フェニルプロピオン酸
(C)アミン
・エタノールアミン
・トリエタノールアミン
(D)ラクトン
・メバロノラクトン
(E)リン酸エステル
・CMP(シチジル酸)
・UMP(ウリジル酸)
・GMP(グアニル酸)
・GDP(グアノシン二リン酸)
・AMP(アデノシン一リン酸)
・トレハロース 6−リン酸
・ニコチンアミドアデニンジヌクレオチドリン酸
(F)その他
・フラビンアデニンジヌクレオチド
(A)アミノ酸
・γ−アミノ酪酸(GABA)
・グルタミン酸
(B)カルボン酸
・5−オキソヘキサン酸
・2−ヒドロキシ吉草酸
・乳酸
・m−トルイル酸
・2−フランカルボン酸
・安息香酸
(C)アミン
・トリエタノールアミン
(E)リン酸エステル
・CMP(シチジル酸)
(F)その他
・フラビンアデニンジヌクレオチド
(A)アミノ酸
・アスパラギン酸
・トリプトファン
・オルニチン
・アルギニン
(C)アミン
・エタノールアミン
(B)カルボン酸
・リンゴ酸
・3−フェニルプロピオン酸
(D)ラクトン
・メバロノラクトン
(E)リン酸エステル
・UMP(ウリジル酸)
・GMP(グアニル酸)
・GDP(グアノシン二リン酸)
・AMP(アデノシン一リン酸)
・トレハロース 6−リン酸
・ニコチンアミドアデニンジヌクレオチドリン酸
1.ハイドロジェノバクター サーモフィラス TK−6
東京大学大学院農学生命科学研究科応用生命工学専攻応用微生物研究室より分譲を受けたハイドロジェノバクター サーモフィラス TK−6(Hydrogenobacter themophilus TK-6)を水素細菌として用いた。以降の説明では、この水素細菌を単に「TK−6」と呼ぶこともある。尚、TK−6は、理化学研究所バイオリソースセンター微生物材料開発室からも入手可能である。
以下に説明する手法により、サーマス サーモフィラス由来LDH(乳酸デヒドロゲナーゼ)導入株であるTK−6 pMKT201KLDHを作製した。クローニングベクターpEX18T (Accession No. AF004910) のマルチクローニングサイトのEcoRI/SacIサイトにrpoDプロモーター (TK-6株由来 HTH_PproD) を挿入し、その下流のSacI/SalIサイトにThermus thermophilus HB27由来 乳酸脱水素酵素遺伝子 (Accession No. TTC0748)、PstIサイトにカナマイシン耐性遺伝子 (Accession number AB121443) およびPstI/SphIサイトに相同組み換えに必要であるHTH_1029 (TK-6株由来 sensor protein) 断片を挿入することで組換え用プラスミドpMKT201KLDHを作製した。このpMKT201KLDHを大腸菌S17-1 (DSM9079) を介した接合伝達によってTK-6株に導入し、相同組み換えによりTK-6株ゲノム上に乳酸脱水素酵素遺伝子を組み込むことで組換え株TK-6 pMKT201KLDHを作製した。以降の説明では、この遺伝子組換え株を単に「TK−6組換え株」と呼ぶこともある。尚、TK−6組換え株は、乳酸産生能を恒常発現し、カナマイシン(Km)耐性は500μg/mLであった。
TK−6及びTK−6組換え株の培養に使用した培地の組成を以下に示す。尚、後述する培養試験(実施例1及び2)においても、以下の組成を有する培地を使用した。
(NH4)2SO4 3g
KH2PO4 1g
K2HPO4 2g
NaCl 0.25g
FeSO4・7H2O 0.014g
MgSO4・7H2O 0.5g
CaCl2 0.03g
微量元素溶液 500μL
MoO3 4mg
ZnSO4・7H2O 28mg
CuSO4・5H2O 2mg
H3BO3 4mg
MnSO4・5H2O 4mg
CoCl2・6H2O 4mg
TK−6に対し、電子媒体物質を介して電気化学的に電子を供給することによる影響について検討した。換言すると、TK−6細胞内の電子の流れ(酸化還元バランス)を、電気化学的に変化させることによる影響について検討した。
(a)TK−6有り、AQDS無し、通電有り
(b)TK−6有り、AQDS有り、通電有り
(c)TK−6無し、AQDS有り、通電有り
(d)TK−6無し、AQDS無し、通電有り
(e)TK−6有り、AQDS有り、通電無し
・試料1:培養試験(e)において、菌体密度が2×108cells/mLに達した時
に培養液を5mL回収
・試料2:培養試験(b)において、菌体密度が1×108cells/mLに達した時
(対数増殖期初期)に培養液を10mL回収
・試料3:培養試験(b)において、菌体密度が2×108cells/mLに達した時
(対数増殖期中期)に培養液を5mL回収
Run buffer : Cation Buffer Solution (p/n : H3301-1001)
Rinse buffer : Cation Buffer Solution (p/n : H3301-1001)
Sample injection : Pressure injection 50 mbar, 10 sec
CE voltage : Positive, 27 kV
MS ionization : ESI Positive
MS capillary voltage : 4,000 V
MS scan range : m/z 50-1,000
Sheath liquid : HMT Sheath Liquid (p/n : H3301-1020)
Run buffer : Anion Buffer Solution (p/n : H3302-1021)
Rinse buffer : Anion Buffer Solution (p/n : H3302-1022)
Sample injection : Pressure injection 50 mbar, 25 sec
CE voltage : Positive, 30 kV
MS ionization : ESI Negative
MS capillary voltage : 3,500 V
MS scan range : m/z 50-1,000
Sheath liquid : HMT Sheath Liquid (p/n : H3301-1020)
相対面積値=目的ピークの面積値/(内部標準物質の面積値×試料量)・・・[式1]
質量誤差(ppm)=(実測値−理論値×106)/実測値
・GABA(γ−アミノ酪酸)
・5−Oxohexanoic acid(5−オキソヘキサン酸)
・FAD_divalent(フラビンアデニンジヌクレオチド(二価))
・CMP(シチジル酸)
・Asp(アスパラギン酸)
・2−Hydroxyvaleric acid(2−ヒドロキシ吉草酸)
・Ethanolamine(エタノールアミン)
・Lactic acid(乳酸)
・m−Toluic acid(m−トルイル酸)
・Triethanolamine(トリエタノールアミン)
・2−Furoic acid(2−フランカルボン酸)
・Trp(トリプトファン)
・Ornithine(オルニチン)
・Arg(アルギニン)
・Benzoic acid(安息香酸)
・Glu(グルタミン酸)
・GABA(γ−アミノ酪酸)
・UMP(ウリジル酸)
・5−Oxohexanoic acid(5−オキソヘキサン酸)
・Mevalonolactone(メバロノラクトン)
・FAD_divalent(フラビンアデニンジヌクレオチド(二価))
・CMP(シチジル酸)
・2−Hydroxyvaleric acid(2−ヒドロキシ吉草酸)
・m−Toluic acid(m−トルイル酸)
・Benzoic acid(安息香酸)
・GMP(グアニル酸)
・Lactic acid(乳酸)
・Malic acid(リンゴ酸)
・NADP+(ニコチンアミドアデニンジヌクレオチドリン酸)
・Trehalose 6−phosphate(トレハロース 6−リン酸)
・GDP(グアノシン二リン酸)
・2−Furoic acid(2−フランカルボン酸)
・AMP(アデノシン一リン酸)
・Triethanolamine(トリエタノールアミン)
・3−Phenylpropionic acid(3−フェニルプロピオン酸)
・Glu(グルタミン酸)
TK−6組換え株に対し、電子媒体物質を介して電気化学的に電子を供給することによる影響について検討した。換言すると、TK−6組換え株の細胞内の電子の流れ(酸化還元バランス)を、電気化学的に変化させることによる影響について検討した。
(a)TK−6組換え株有り、AQDS有り、通電有り
(b)TK−6組換え株有り、AQDS有り、通電無し
(c)TK−6有り、AQDS有り、通電無し
4 培地(培養液)
5 電子媒体物質
9 電極(作用電極)
(A)アミノ酸
・γ−アミノ酪酸(GABA)
・アスパラギン酸
・トリプトファン
・オルニチン
・アルギニン
・グルタミン酸
(B)カルボン酸
・5−オキソヘキサン酸
・2−ヒドロキシ吉草酸
・乳酸
・m−トルイル酸
・2−フランカルボン酸
・安息香酸
・リンゴ酸
・3−フェニルプロピオン酸
(C)アミン
・エタノールアミン
・トリエタノールアミン
(D)ラクトン
・メバロノラクトン
(E)リン酸エステル
・CMP(シチジル酸)
・UMP(ウリジル酸)
・GMP(グアニル酸)
・GDP(グアノシン二リン酸)
・AMP(アデノシン一リン酸)
・トレハロース 6−リン酸
・ニコチンアミドアデニンジヌクレオチドリン酸
(F)その他
・フラビンアデニンジヌクレオチド
1.ハイドロジェノバクター サーモフィラス TK−6
東京大学大学院農学生命科学研究科応用生命工学専攻応用微生物研究室より分譲を受けたハイドロジェノバクター サーモフィラス TK−6(Hydrogenobacter thermophilus TK-6)を水素細菌として用いた。以降の説明では、この水素細菌を単に「TK−6」と呼ぶこともある。尚、TK−6は、理化学研究所バイオリソースセンター微生物材料開発室からも入手可能である。
Claims (8)
- 培地中の水素細菌に対し、酸化体と還元体の両形態をとり得る電子媒体物質を介して電子の供給を行いながら、水素と二酸化炭素と前記水素細菌の最終電子受容体として機能する物質とを与えて培養を行うことを特徴とする水素細菌の代謝制御方法。
- 前記電子の供給は、前記培地に前記電子媒体物質を添加すると共に前記培地に電極を接触させて、前記電極に還元電位を印加することにより行う、請求項1に記載の水素細菌の代謝制御方法。
- 前記電子媒体物質は、キノン類である、請求項1又は2に記載の水素細菌の代謝制御方法。
- 前記水素細菌は、ハイドロジェノバクター サーモフィラス(Hydrogenobacter themophilus)である、請求項1〜3のいずれか1項に記載の水素細菌の代謝制御方法。
- 前記水素細菌は、サーマス サーモフィラス(Thermus thermophilus)由来の乳酸デヒドロゲナーゼ遺伝子を導入したハイドロジェノバクター サーモフィラス TK−6(Hydrogenobacter themophilus TK-6)の遺伝子組換え株である、請求項1〜3のいずれか1項に記載の水素細菌の代謝制御方法。
- 請求項1〜3のいずれか1項に記載の水素細菌の代謝制御方法を実施する工程を含む、水素細菌を利用した有用物質の生産方法。
- 請求項4に記載の水素細菌の代謝制御方法を実施する工程を含む、アミノ酸、カルボン酸、アミン、ラクトン、リン酸エステル及びフラビンアデニンジヌクレオチドからなる群から選択される1種以上の有用物質の生産方法。
- 請求項5に記載の水素細菌の代謝制御方法を実施する工程を含む、乳酸の生産方法。
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