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Pループ型ATP加水分解酵素の機能発現機構の解明

Publicly Offered Research

Project AreaWater plays a key role in ATP hydrolysis and ATP-driven functions of proteins
Project/Area Number 23118713
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Complex systems
Research InstitutionYokohama City University

Principal Investigator

池口 満徳  横浜市立大学, 生命ナノシステム科学研究科, 准教授 (60261955)

Project Period (FY) 2011-04-01 – 2013-03-31
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2012: ¥8,320,000 (Direct Cost: ¥6,400,000、Indirect Cost: ¥1,920,000)
Fiscal Year 2011: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
KeywordsPループ / ATP加水分解酵素 / 相同組換え / RecA/Rad51/RadA / 分子動力学 / アルギニンフィンガー / Pループ / Swi5/Sfr1 / F1-ATPase / 水のエントロピー
Outline of Annual Research Achievements

本研究は,Pループ型ATP加水分解酵素の機能発現機構について,分子シミュレーション等の計算科学的手法を用いて解析することを目的としている.
平成24年度には,DNA相同組換えで働くPループ型ATP加水分解酵素であるRad51について,分子構造モデリングと分子動力学シミュレーションを行い,論文として,Biophysical Journal誌に出版することができた.Rad51の原子レベルの立体構造はX線結晶解析により得られているが,モノマー間の界面にはATPは存在せず,電子顕微鏡研究などで得られている活性型の構造とは言えない.そこで,まず,フィラメントの最小単位である2量体について,古細菌の類縁タンパク質であるRadAの結晶構造を参照して分子構造モデリングを行い,全原子分子動力学シミュレーションを遂行した.その結果,ATPのγリン酸部位では,安定な活性型構造を維持するのに,カリウムイオンが必須であり,隣接モノマーのH352, D374と相互作用ネットワークを形成していることを見出した.このようなカリウムイオンの相互作用は,他のPループ型ATP加水分解酵素におけるアルギニンフィンガーと類似の機能を果たしているように示唆された.さらに,もうひとつの活性型構造を維持するメカニズムとして,ATPのアデニン環が,R228と, 隣接モノマーにあるP379に挟まれるように相互作用することも見出した.このように,ATPがモノマー間の「糊」として働いており,活性型構造を安定化していることを明らかにした.
また,領域内の液体統計力学解析の専門家と共同研究を行い,溶媒効果,特に水のエントロピー解析を発展させ,他のPループ型ATP加水分解酵素であるF1-ATPaseについて,分子動力学シミュレーションと統計力学解析を基に動作メカニズムを提案した.

Research Progress Status

24年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

24年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (15 results)

All 2013 2012 2011

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (8 results) (of which Invited: 1 results)

  • [Journal Article] Molecular Modeling and Molecular Dynamics Simulations of Recombinase Rad512013

    • Author(s)
      Y. Kokabu, M. Ikeguchi
    • Journal Title

      Biophys. J

      Volume: 104 Issue: 7 Pages: 1556-1565

    • DOI

      10.1016/j.bpj.2013.02.014

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Molecular Dynamics Simulations of Yeast F1-ATPase Before and After 16-degree Rotation of the Gamma Subunit2013

    • Author(s)
      Yuko Ito, Takashi Yoshidome, Nobuyuki Matubayashi, Masahiro Kinoshita, Mitsunori Ikeguchi
    • Journal Title

      The journal of Physical Chemistry B

      Volume: 117 Issue: 12 Pages: 3298-3307

    • DOI

      10.1021/jp312499u

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanistic insights into the activation of Rad51-mediated strand exchange from the structure of a recombination activator, the Swi5-Sfr1 complex2013

    • Author(s)
      N.Kuwabara, Y.Murayama, H.Hashimoto, Y.Kokabu, M.Ikeguchi, M.Sato, K.Mayanagi, Y.Tsutsui, H.Iwasaki,and T.Shimizu
    • Journal Title

      Structure

      Volume: 20 Issue: 3 Pages: 440-449

    • DOI

      10.1016/j.str.2012.01.005

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Structural Characteristics of Yeast F_1-ATPase Before and After 16-degree Rotation of the γ Subunit : Theoretical Analysis Focused on the Water-Enrtopy Effect2012

    • Author(s)
      Takashi Yoshidome, Yuko Ito, Nobuyuki Matubayashi, Mitunori Ikeguchi, Masahiro Kinoshita
    • Journal Title

      Journal of Chemical Physics

      Volume: 137 Issue: 3 Pages: 8-8

    • DOI

      10.1063/1.4734298

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characterization of Experimentally Determined Native-Structure Models of a Protein Using Energetic and Entropic Components of Free-Energy Function2012

    • Author(s)
      H. Mishima, S. Yasuda, T. Yoshidome, H. Oshima, Y. Harano, M. Ikeguchi, M. Kinoshita
    • Journal Title

      Journal of Physical Chemistry B

      Volume: 116 Issue: 27 Pages: 7776-7786

    • DOI

      10.1021/jp301541z

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fission yeast Swi5-Sfr1 protein complex, an activator of Rad51 recombinase, forms an extremely elongated dogleg-shaped structure2011

    • Author(s)
      Kokabu Y, Murayama Y, Kuwabara N, Oroguchi T, Hashimoto H, Tsutsui Y, Nozaki N, Akashi S, Unzai S, Shimizu T, Iwasaki H, Sato M, Ikeguchi M
    • Journal Title

      J Biol Chem

      Volume: 286 Issue: 50 Pages: 43569-43576

    • DOI

      10.1074/jbc.m111.303339

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crucial Importance of Water-Entropy Effect for Predicting Hot Spots in Protein-Protein Complexes2011

    • Author(s)
      H.Oshima, S.Yasuda, T.Yoshidome, M.Ikeguchi, M.Kinoshita
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 13 Issue: 36 Pages: 16236-16246

    • DOI

      10.1039/c1cp21597c

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Presentation] Molecular modeling and molecular dynamics simulations of recombinase Rad512013

    • Author(s)
      Yuichi Kokabu, Mitsunori Ikeguchi
    • Organizer
      57th Annual Meeting of Biophysical Society
    • Place of Presentation
      Philadelphia, USA
    • Year and Date
      2013-02-02
    • Related Report
      2012 Annual Research Report
  • [Presentation] Molecular dynamics simulations of Rad51 recombinase2012

    • Author(s)
      Mitsunori Ikeguchi
    • Organizer
      The 2nd International conference on New frontier of the research in RecA-family recombinase and its accessory proteins -RecA family 2012-
    • Place of Presentation
      京都
    • Year and Date
      2012-11-28
    • Related Report
      2012 Annual Research Report
    • Invited
  • [Presentation] 分子動力学シミュレーションによる Rad51リコンビナーゼの分子モデリンク2012

    • Author(s)
      小甲 裕一、池口 満徳
    • Organizer
      日本蛋白質科学会第12回年会
    • Place of Presentation
      名古屋
    • Year and Date
      2012-06-12
    • Related Report
      2012 Annual Research Report
  • [Presentation] Theoretical study on rotational mechanism of F1 molecular motor and a symmetric structures2011

    • Author(s)
      Mitsunori Ikeguchi
    • Organizer
      日本生物物理学会第49回年会
    • Place of Presentation
      姫路(招待講演)
    • Related Report
      2011 Annual Research Report
  • [Presentation] Molecular modeling of Rad51 recombinase using molecular dynamics simulations2011

    • Author(s)
      Yuichi Kokabu, Mitsunori Ikeguchi
    • Organizer
      日本生物物理学会第49回年会
    • Place of Presentation
      姫路
    • Related Report
      2011 Annual Research Report
  • [Presentation] A theoretical analysis on water-entropy change in yeast F1-ATPase during 16 degrees rotation of gamma subunit2011

    • Author(s)
      Takashi Yoshidome, Mitunori Ikeguchi, Masahiro Kinoshita
    • Organizer
      日本生物物理学会第49回年会
    • Place of Presentation
      姫路
    • Related Report
      2011 Annual Research Report
  • [Presentation] Crucial Importance of Water-Entropy Effect for Hot Spots in Protein-Protein Complexes2011

    • Author(s)
      Hiraku Oshima, Satoshi Yasuda, Takashi Yoshidome, Mitsunori Ikeguchi, Masahiro Kinoshita
    • Organizer
      日本生物物理学会第49回年会
    • Place of Presentation
      姫路
    • Related Report
      2011 Annual Research Report
  • [Presentation] A novel rotation mechanism of F1-ATPase based on the water-entropy effect2011

    • Author(s)
      Takashi Yoshidome, Yuko Ito, Nobuyuki Matubayasi, Mitunori Ikeguchi, Masahiro Kinoshita
    • Organizer
      56th Annual Meeting of Biophysical Society
    • Place of Presentation
      姫路
    • Related Report
      2011 Annual Research Report

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Published: 2011-04-06   Modified: 2018-03-28  

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