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Dynamic Structural Characterization of Electron Transfer Complex in Respiratory Chain of Mitochondria and Its Electron Transfer Regulation Mechanism

Research Project

Project/Area Number 16H04173
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Bio-related chemistry
Research InstitutionHokkaido University

Principal Investigator

Ishimori koichiro  北海道大学, 理学研究院, 教授 (20192487)

Co-Investigator(Kenkyū-buntansha) 内田 毅  北海道大学, 理学研究院, 准教授 (30343742)
齋尾 智英  北海道大学, 理学研究院, 助教 (80740802)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2018: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Keywordsシトクロムc / シトクロムc酸化酵素 / ミトコンドリア呼吸鎖 / ナノディスク / 電子伝達 / TCS / 構造揺らぎ / 電子伝達経路 / 脱水和 / 構造的揺らぎ / 電子伝達複合体
Outline of Final Research Achievements

One of the essential biological processes, the four-electron reduction of molecular oxygen to water molecules in the mitochondrial respiratory chain, is promoted by the electron transfer from cytochrome c, a typical heme-containing electron transfer protein, to membrane-bound cytochrome c oxidase. In this study, we examined the electron transfer reaction under the physiological conditions and revealed that the interactions between the proteins and lipids in the membrane, structural fluctuations, transient structural changes, of the proteins, the specific protein-protein interactions mediated by a few amino acid residues, and hydrophobic environment in the electron transfer pathways are the crucial factors to effectively promote the electron transfer reaction from cytochrome c to cytochrome c oxidase. These observations and discussion would contribute to the understanding of the molecular regulation mechanism for the inter-protein electron transfer reaction in vivo.

Academic Significance and Societal Importance of the Research Achievements

シトクロムcからシトクロムc酸化酵素への電子伝達が阻害されれば、細胞のエネルギー源であるATPの生産が停止してしまうことから、その電子伝達反応の制御機構の解明は生命の化学的理解には必須であり、また、蛋白質中の電子の流れを制御することができれば、生体分子を利用した電子素子の開発にもつながる。本研究では、複雑な構造である蛋白質間を電子がどのようにして効率的に伝達されていくのかについて、その蛋白質の分子構造に基づいて議論することで、生体分子における電子の流れの制御機構の一端を明らかにしようとするものである。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (11 results)

All 2019 2018 2017 2016 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Remarks (2 results)

  • [Journal Article] Uncovering dehydration in cytochrome <i>c</i> refolding from urea- and guanidine hydrochloride-denatured unfolded state by high pressure spectroscopy2019

    • Author(s)
      Konno, S., Doi, K., Ishimori, K.
    • Journal Title

      Biophysics and Physicobiology

      Volume: 16 Issue: 0 Pages: 18-27

    • DOI

      10.2142/biophysico.16.0_18

    • NAID

      130007585358

    • ISSN
      2189-4779
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Polyethylene glycol promotes autoxidation of cytochrome c2018

    • Author(s)
      Sato Wataru、Uchida Takeshi、Saio Tomohide、Ishimori Koichiro
    • Journal Title

      Biochimica et Biophysica Acta (BBA) - General Subjects

      Volume: 1862 Issue: 6 Pages: 1339-1349

    • DOI

      10.1016/j.bbagen.2018.03.010

    • NAID

      120006585774

    • Related Report
      2018 Annual Research Report 2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Electron Transfer Pathway Analysis from Cytochrome c to Cytochrome c Oxidase Under Turnover Conditions2018

    • Author(s)
      Ishimori, K.
    • Organizer
      233rd ECS Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electron Transfer from Cytochrome c to Cytochrome c Oxidase: Formation of “Breakwater” in Electron Pathway2018

    • Author(s)
      Ishimori, K.
    • Organizer
      Supramolecular Chemistry of Nitrogen Ligands
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Entropically essential dehydration upon cytochrome c - cytochrome c oxidase complex formation to prevent electron leaks to the bulk water phase from the protein-protein interface2017

    • Author(s)
      Ishimori, K.
    • Organizer
      GRC Metals in Biology
    • Place of Presentation
      Ventura(U.S.A.)
    • Year and Date
      2017-01-22
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Structural and Functional Characterization of Electron Transfer Complex Between Cytochrome c and Cytochrome c Oxidase2017

    • Author(s)
      Ishimori, K.
    • Organizer
      231st ECS Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ナノディスクに再構成した Vibrio cholerae 由来シトクロム cbb3 の構造,機能的評価2016

    • Author(s)
      井上真尚、柴田明宏、今井瑞依、内田毅、村本和優、城宜嗣、吉川信也、石森浩一郎
    • Organizer
      第54回日本生物物理学会年会
    • Place of Presentation
      つくば国際会議場(茨城県・つくば市)
    • Year and Date
      2016-11-25
    • Related Report
      2016 Annual Research Report
  • [Presentation] Functional significance of trimerization in Cl- pumping properties of halorhodopsin examined by nanodisc reconstitution2016

    • Author(s)
      橋本江里、鈴木研士郎、山本愛弓、塚本卓、内田毅、菊川峰志、出村誠、石森浩一郎
    • Organizer
      第54回日本生物物理学会年会
    • Place of Presentation
      つくば国際会議場(茨城県・つくば市)
    • Year and Date
      2016-11-25
    • Related Report
      2016 Annual Research Report
  • [Presentation] Energetic Analysis of Interactions in Electron Transfer Complex Between Cytochrome c and Cytochrome c Oxidase2016

    • Author(s)
      Ishimori, K.
    • Organizer
      229th ECS Meeting
    • Place of Presentation
      San Diego(U.S.A.)
    • Year and Date
      2016-05-29
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 発表論文からpick up

    • URL

      http://wwwchem.sci.hokudai.ac.jp/~stchem/pickup/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 発表論文からpickup

    • URL

      http://wwwchem.sci.hokudai.ac.jp/~stchem/pickup/

    • Related Report
      2017 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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