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2010 Fiscal Year Annual Research Report

新規Ni酵素による水素活性化機構の解明とその利用

Research Project

Project/Area Number 22370061
Research InstitutionUniversity of Hyogo

Principal Investigator

樋口 芳樹  兵庫県立大学, 大学院・生命理学研究科, 教授 (90183574)

Keywordsヒドロゲナーゼ / X線結晶解析 / 反応機構 / Ni酵素 / 燃料電池
Research Abstract

本研究では,最近新たに見つかった酸素耐性NAD^+還元4量体ヒドロゲナーゼや,膜結合性シトクロムb含有6量体ヒドロゲナーゼの高分解能X線結晶解析を行うとともに,従来型酵素で未だ得られていない2つの「活性型(Ni-SIa型とNi-R型)」の構造を明らかにし,Niの関わる生体内水素活性化触媒反応機構(プロトン・ヒドリド・電子の生成)の全容を理解することを目的とした.その結果,平成22年度は,水素酸化菌Hydrogenophilus themoluteolus TH-1(HtTH-1)の培養法と本菌体由来の新規のNAD^+還元型[NiFe]ヒドロゲナーゼの精製法を確立した.培養では,一般的な栄養培地である,2x-Yeast-Trypton(2x-YT)培地を用いた20L規模の従属栄養的培養で500gの菌体を得ることに成功した.得られた菌体のNAD^+還元活性を測定したところ,従来の独立栄養的な培養から得られた菌体の酵素活性とほぼ同程度であった.次に,好気的条件下での効率的な精製法の確立を目指した.まず,培養菌体破砕上清に活性画分を得た後,溶液のpHを変化さないように硫安分画することで多くの夾雑タンパク質を除去し,かつ高活性画分を得ることに成功した.その後,陰イオン交換クロマトグラフィー(2回)とゲル濾過クロマトグラフィーを行うことで,SDSおよびNative電気泳動で,4本および単一のバンドを示す最終精製標品を得た.SDS電気泳動で得られた4本のバンド試料のN末端部分のアミノ酸配列分析で,本試料がHtTH-1由来のNAD^+還元型[NiFe]ヒドロゲナーゼであることを確認した。
膜結合性シトクロムb含有6量体ヒドロゲナーゼについては,結晶化に成功した.

  • Research Products

    (24 results)

All 2011 2010

All Journal Article (11 results) (of which Peer Reviewed: 11 results) Presentation (12 results) Book (1 results)

  • [Journal Article] A Functional Role of the Glycosylated N-terminal Domain of Chondromodulin-I2011

    • Author(s)
      J.Kondo, et al.
    • Journal Title

      J.Bone Miner.Metab.

      Volume: 29 Pages: 23-30

    • Peer Reviewed
  • [Journal Article] Positively Charged Domain Located Downstream of PIP Box, Together with TD Amino Acids within PIP Box, is Important for CRL4^<Cdt2> -mediated Proteolysis2011

    • Author(s)
      M.Michishita, et al.
    • Journal Title

      Gene to Cells

      Volume: 16 Pages: 12-22

    • Peer Reviewed
  • [Journal Article] How Coenzyme B12-dependent Ethanolamine Ammonialyase Deals with Both Enantiomers of 2-Amino-1-propanol as Substrates : Structure-based Rationalization2011

    • Author(s)
      N.Shibata, et al.
    • Journal Title

      Biochemistry

      Volume: 50 Pages: 591-598

    • Peer Reviewed
  • [Journal Article] Structure and Molecular Evolution of Multicopper Blue Proteins2010

    • Author(s)
      H. Komori and Y. Higuchi
    • Journal Title

      BIOMOLECULAR CONCEPTS

      Volume: 1 Pages: 31-40

    • DOI

      DOI:10.1515/BMC.2010.004

    • Peer Reviewed
  • [Journal Article] Purification, Crystallization and Preliminary X-ray Analysis of the Dissimilatory Sulfite Reductase from Desulfovibrio vulgaris Miyazaki F2010

    • Author(s)
      H. Ogata, Y. Shomura, A.G. Agrawal, A.P. Kaur, W. Gartner, Y. Higuchi and W. Lubitz
    • Journal Title

      Acta Crystallogr.

      Volume: F66 Pages: 1470-1472

    • DOI

      DOI:10.1107/S1744309110033191

    • Peer Reviewed
  • [Journal Article] Expression, Crystallization and Preliminary X-ray Crystallographic Study of Ethanolamine Ammonia-lyase from Escherichia coli2010

    • Author(s)
      N. Shibata, H. Tamagaki, S. Ohtsuki, N. Hieda, K. Akita, H. Komori, Y. Shomura, S. Terawaki, T. Toraya, N. Yasuoka and Y. Higuchi
    • Journal Title

      Acta Crystallogr.

      Volume: F66 Pages: 709-711

    • DOI

      DOI:10.1107/S1744309110014478

    • Peer Reviewed
  • [Journal Article] Enzymatic Synthesis of Nylon-6 units in Organic Solvent Contained Low-water : Structural Requirement of 6-aminohexanoate-dimer Hydrolase for Efficient Amide Synthesis2010

    • Author(s)
      Y.Kawashima, et al.
    • Journal Title

      J Mol.Cat.B

      Volume: 64 Pages: 81-88

    • Peer Reviewed
  • [Journal Article] Crystal Structures of Ethanolamine Ammonia-lyase complexed with Coenzyme B_<12> Analogs and Substrates2010

    • Author(s)
      N.Shibata, et al.
    • Journal Title

      J Biol.Chem.

      Volume: 285 Pages: 26484-26493

    • Peer Reviewed
  • [Journal Article] Cytochrome c polymerization by successive domain swapping at the C-terminal helix2010

    • Author(s)
      S.Hirota, et al.
    • Journal Title

      Proc.Natl.Acad.Sci.

      Volume: 107 Pages: 12854-12859

    • Peer Reviewed
  • [Journal Article] Crystallization and Preliminary X-ray Analysis of Dimeric and Trimeris Cytochromes c from Horse Heart2010

    • Author(s)
      M.Taketa, et al.
    • Journal Title

      Acta Crystallogr.

      Volume: F66 Pages: 1477-1479

    • Peer Reviewed
  • [Journal Article] Crystal Structure Analysis of Bacillus subtilis Ferredoxin-NADP^+ Oxid oreductase and the Structural Basis for Its Substrate Selectivity2010

    • Author(s)
      H.Komori, et al.
    • Journal Title

      Protein Science

      Volume: 19 Pages: 2279-2290

    • Peer Reviewed
  • [Presentation] Structural Basis for the Reaction Mechanism of Dissimilatory Sulfite Reductase2011

    • Author(s)
      Y.Shomura, et al.
    • Organizer
      International Symposium on Chemistry of Reductases IV
    • Place of Presentation
      名古屋
    • Year and Date
      20110120-20110121
  • [Presentation] Crystallization and X-ray Analysis of ATP-sulfurylase from Sulfate-reducing Bacteria2011

    • Author(s)
      M.Taketa, et al.
    • Organizer
      International Symposium on Chemistry of Reductases IV
    • Place of Presentation
      名古屋
    • Year and Date
      20110120-20110121
  • [Presentation] 中性子構造化学でヒドロゲナーゼの水素分子活性化機構は理解できるか?2011

    • Author(s)
      樋口芳樹
    • Organizer
      中性子構造生物学およびタンパク質水和構造に関するシンポジウム
    • Place of Presentation
      水戸
    • Year and Date
      2011-03-04
  • [Presentation] 枯草菌由来フェレドキシン-NADPH還元酵素のX線結晶構造解析2010

    • Author(s)
      小森博文, et al.
    • Organizer
      2010年度日本結晶学会年会
    • Place of Presentation
      吹田
    • Year and Date
      20101203-20101205
  • [Presentation] 膜結合型[NiFe]ヒドロゲナーゼのX線結晶構造解析2010

    • Author(s)
      庄村康人, et al.
    • Organizer
      2010年度日本結晶学会年会
    • Place of Presentation
      吹田
    • Year and Date
      20101203-20101205
  • [Presentation] B12-補酵素関与エタノールアミアンモニアリアーゼの立体構造に基づく立体化学経路の解明2010

    • Author(s)
      柴田直樹, et al.
    • Organizer
      2010年度日本結晶学会年会
    • Place of Presentation
      吹田
    • Year and Date
      20101203-20101205
  • [Presentation] Basis for the Lack of Stereospecificity in Coenzyme B_<12>-dependent Ethanolamine ammonia-lyase2010

    • Author(s)
      N.Shibata, et al.
    • Organizer
      The 10th Conference of the Asian Crystallographic Association
    • Place of Presentation
      Pusan
    • Year and Date
      20101101-20101103
  • [Presentation] The Role of the π-electron System in Regulation of Reduction Potentials of Tetraheme Cytochrome c_32010

    • Author(s)
      H.Akutsu, et al.
    • Organizer
      The 10th Conference of the Asian Crystallographic Association
    • Place of Presentation
      Pusan
    • Year and Date
      20101101-20101103
  • [Presentation] Improved Technologies for High-resolution X-ray Crystallography2010

    • Author(s)
      H.Tanaka, et al.
    • Organizer
      The 10th Conference of the Asian Crystallographic Association
    • Place of Presentation
      Pusan
    • Year and Date
      20101101-20101103
  • [Presentation] Enzymatic Degradation and Synthesis of Nylon-6 Related Compounds.2010

    • Author(s)
      S.Negoro, et al.
    • Organizer
      International Symposium on BioPolymers 2010
    • Place of Presentation
      Stuttgart
    • Year and Date
      2010-10-04
  • [Presentation] Cytochrome c Polymerization by Successive Domain Swapping at the C-terminal Helix2010

    • Author(s)
      S.Hirota, et al.
    • Organizer
      日本生物物理学会第48回年会
    • Place of Presentation
      仙台
    • Year and Date
      2010-09-22
  • [Presentation] ナイロンオリゴマ-分解酵素の精密構造解析2010

    • Author(s)
      樋口芳樹
    • Organizer
      第10回日本蛋白質科学会年会
    • Place of Presentation
      札幌
    • Year and Date
      2010-06-18
  • [Book] 構造生物学-原子構造からみた生命現象の営み2010

    • Author(s)
      樋口芳樹, 中川敦史
    • Total Pages
      253
    • Publisher
      共立出版株式会社

URL: 

Published: 2012-07-19  

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