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Exploring the limits of quasi-static operation of F1 motors

Research Project

Project/Area Number 18K06164
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43040:Biophysics-related
Research InstitutionChuo University

Principal Investigator

Muneyuki Eiro  中央大学, 理工学部, 教授 (80219865)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords分子モーター / 自由エネルギー変換 / 熱力学 / F1-ATPase / 高温条件 / F1モーター / エネルギー変換効率 / ストールトルク / 安定性 / エネルギー論 / 非平衡 / 準静的過程 / 熱散逸 / 生体エネルギー論 / 自由エネルギー
Outline of Final Research Achievements

The F1 motor, which is part of the FoF1-ATP synthase, is known to perform the free energy transduction between ATP synthesis / hydrolysis and the mechanical rotation with almost 100% efficiency. This high efficiency is thought to be due to the quasi-static operation of the F1 motor. Therefore, we investigated extreme conditions that would prevent quasi-static operation to reduce the energy conversion efficiency of the F1 motor, aiming to highlight high-efficiency conditions or mechanisms. As a result, the energy conversion efficiency decreased under high temperature conditions, and a research paper is currently being written. In addition, we were able to analyze a mutant whose energy conversion efficiency decreases due to the introduction of a mutation, and published a paper for discussion.

Academic Significance and Societal Importance of the Research Achievements

分子モーターは,化学反応と力学的な運動を共役するエネルギー変換装置であるとよく言われることだが,実際に化学反応の自由エネルギー変化を制御した上で,保存力に対する仕事を計測している研究は極めて少ない.申請者のグループの研究はそのような点に配慮して実験をおこなっている非常に少ない例であり,本当に物理化学的な視点に立ったときに考えるべきデータを提供できるものである.今回得られた結果は,更に知見を加えないと突っ込んだ議論には踏み込めないが,将来に向けて貴重な知見を与えていると考えられる.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2020 2019 2018

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

  • [Journal Article] Tight Chemomechanical Coupling of the F1 Motor Relies on Structural Stability2020

    • Author(s)
      Tanaka Mana、Kawakami Tomohiro、Okaniwa Tomoaki、Nakayama Yohei、Toyabe Shoichi、Ueno Hiroshi、Muneyuki Eiro
    • Journal Title

      Biophysical Journal

      Volume: 119 Issue: 1 Pages: 48-54

    • DOI

      10.1016/j.bpj.2020.04.039

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Presentation] The Measurement of Mechanical Work of Thermophilic F1-ATPase at the Optimum Growth Temperature2019

    • Author(s)
      岡庭 有明, 中山 洋平, 寺原 直矢, 宗行 英朗
    • Organizer
      第57回日本生物物理学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Step analysis of the Bacillus Na+-driven flagellar motor2019

    • Author(s)
      寺原 直矢, 楊 未来, 宗行 英朗, 難波 啓一, 南野 徹
    • Organizer
      第57回日本生物物理学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] F1 モーターの反応過程におけるリン酸解離のタイミングについて2019

    • Author(s)
      宗行英朗
    • Organizer
      「水和と ATP エネルギー」研究会
    • Related Report
      2018 Research-status Report
  • [Presentation] Thermodynamic Efficiency of F1-ATPase at High Temperature2018

    • Author(s)
      Tomoaki Okaniwa, Yohei Nakayama, Eiro Muneyuki
    • Organizer
      第 56 回日本生物物理学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] On the timing of phosphate release in the ATPase reaction by TF12018

    • Author(s)
      Eiro Muneyuki, Yohei Nakayama, Shoichi Toyabe, Hiroshi Ueno
    • Organizer
      第 56 回日本生物物理学会年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Energetics of Thermophilic F1 motor2018

    • Author(s)
      Eiro Muneyuki
    • Organizer
      Sendai Molecular Motor Workshop
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] ラチェットモデルを出発点とした二次能動輸送のトイモデル2018

    • Author(s)
      宗行英朗
    • Organizer
      日本生体エネルギー研究会第44回討論会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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