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Theoretical prediction of mutations that speed up substrate transportation in transporter protein

Research Project

Project/Area Number 18H02415
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43040:Biophysics-related
Research InstitutionOkazaki Research Facilities, National Institutes of Natural Sciences (2020)
Institute for Molecular Science (2018-2019)

Principal Investigator

Kei-ichi Okazaki  大学共同利用機関法人自然科学研究機構(岡崎共通研究施設), 計算科学研究センター, 准教授 (50792529)

Co-Investigator(Kenkyū-buntansha) 渡邉 力也  国立研究開発法人理化学研究所, 開拓研究本部, 主任研究員 (30540108)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2020: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Keywordsトランスポーター / 分子動力学シミュレーション / 遷移パス / 基質輸送速度 / 疎水性ゲート / 生体膜マイクロチップ
Outline of Final Research Achievements

In this project, we used molecular dynamics simulations to elucidate the structural transition dynamics during substrate transport by transporter proteins, and to predict mutations that alter the substrate transport rate. We performed all-atom simulations of the transition dynamics between the inward- and outward-open conformations during substrate transport in the Na+/H+ antiporter PaNhaP, and identified the opening of the outside hydrophobic gate as the rate-limiting process. Then, we experimentally measured the substrate transport rate of the mutant with weakened interaction of the outside hydrophobic gate, and confirmed that the substrate transport rate was enhanced compared with the wild type. This study helped to elucidate the mechanism of functional regulation of the transporter.

Academic Significance and Societal Importance of the Research Achievements

トランスポーターは細胞内外のイオン等基質濃度の制御に関わっており、その機能不全により様々な病気が引き起こされる。例えば、我々が研究対象としているNa+/H+交換輸送体はヒトにおいてはNHEと呼ばれており心不全や自閉症の発症に関わっている。従って、トランスポーターの動作メカニズム解明は、創薬など医学的な応用につながり得る。さらに、基質輸送速度を向上させる改変は、植物の塩耐性向上や糖度向上など農学的な応用の可能性もある。このような応用可能性に加えて、トランスポーターの物理化学的メカニズム解明は、分子科学において新しいチャレンジであり重要な成果である。

Report

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

    (21 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 9 results) Remarks (1 results)

  • [Int'l Joint Research] Max Planck Institute of Biophysics(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] マックスプランク生物物理学研究所(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Optimizing Go-MARTINI Coarse-Grained Model for F-BAR Protein on Lipid Membrane2021

    • Author(s)
      Mahmood Md. Iqbal、Poma Adolfo B.、Okazaki Kei-ichi
    • Journal Title

      Frontiers in Molecular Biosciences

      Volume: 8 Pages: 619381-619381

    • DOI

      10.3389/fmolb.2021.619381

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chemical-State-Dependent Free Energy Profile from Single-Molecule Trajectories of Biomolecular Motors: Application to Processive Chitinase2020

    • Author(s)
      Okazaki Kei-ichi、Nakamura Akihiko、Iino Ryota
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 124 Issue: 30 Pages: 6475-6487

    • DOI

      10.1021/acs.jpcb.0c02698

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Learning reaction coordinates via cross-entropy minimization: Application to alanine dipeptide2020

    • Author(s)
      Mori Yusuke、Okazaki Kei-ichi、Mori Toshifumi、Kim Kang、Matubayasi Nobuyuki
    • Journal Title

      The Journal of Chemical Physics

      Volume: 153 Issue: 5 Pages: 054115-054115

    • DOI

      10.1063/5.0009066

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanism of the electroneutral sodium/proton antiporter PaNhaP from transition-path shooting2019

    • Author(s)
      Okazaki Kei-ichi、Wohlert David、Warnau Judith、Jung Hendrik、Yildiz Ozkan、Kuhlbrandt Werner、Hummer Gerhard
    • Journal Title

      Nature Communications

      Volume: 10 Issue: 1 Pages: 1742-1742

    • DOI

      10.1038/s41467-019-09739-0

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Curvature induction and sensing of the F-BAR protein Pacsin1 on lipid membranes via molecular dynamics simulations2019

    • Author(s)
      Mahmood Md. Iqbal、Noguchi Hiroshi、Okazaki Kei-ichi
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 14557-14557

    • DOI

      10.1038/s41598-019-51202-z

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ion Binding and Selectivity of the Na+/H+ Antiporter MjNhaP1 from Experiment and Simulation2019

    • Author(s)
      Warnau Judith、Wohlert David、Okazaki Kei-ichi、Yildiz Ozkan、Gamiz-Hernandez Ana P.、Kaila Ville R. I.、Kuhlbrandt Werner、Hummer Gerhard
    • Journal Title

      The Journal of Physical Chemistry B

      Volume: 124 Issue: 2 Pages: 336-344

    • DOI

      10.1021/acs.jpcb.9b08552

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Chitinase Moves on and Degradates Crystalline Chitin with Brownian Motion2019

    • Author(s)
      NAKAMURA Akihiko、OKAZAKI Kei-ichi、FURUTA Tadaomi、SAKURAI Minoru、IINO Ryota
    • Journal Title

      Seibutsu Butsuri

      Volume: 59 Issue: 6 Pages: 330-333

    • DOI

      10.2142/biophys.59.330

    • NAID

      130007750992

    • ISSN
      0582-4052, 1347-4219
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 生体分子マシンにおける機能発現ダイナミクスの解明とその制御2021

    • Author(s)
      岡崎圭一
    • Organizer
      第1回生体分子シミュレーション・モデリング研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Curvature induction and sensing of the F-BAR protein Pacsin1 on lipid membranes via molecular dynamics simulations2020

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      第58回日本生物物理学会年会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 分子モーターの1方向性運動モデルの新規推定法の開発 ―キチナーゼへの応用2020

    • Author(s)
      岡崎圭一
    • Organizer
      第10回分子モーター討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Mechanism of Na+/H+ antiporter from transition path sampling and engineering of a faster transporter2020

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      Frontiers of Computational Physics from meV to MeV
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Dynamic energy landscape of a linear motor chitinase from single-particle tracking trajectories2019

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      第57回日本生物物理学会年会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Molecular simulation and modeling of functional dynamics in FoF1 ATP synthase2019

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      2nd Tokyo ATPase Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 遷移パスサンプリングによる膜輸送タンパク質の基質輸送メカニズムの解明2019

    • Author(s)
      岡崎圭一
    • Organizer
      スーパーコンピュータワークショップ2018
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Mechanism of electroneutral sodium/proton antiporter from transition-path shooting2018

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      Institute Seminar, Max-Planck Institute of Biophysics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 生体分子マシンにおける機能ダイナミクスの解明2018

    • Author(s)
      岡崎圭一
    • Organizer
      生物物理若手の会第58回夏の学校
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Mechanism of Na+/H+ antiporter from transition-path simulations: Making faster transporter based on mechanism2018

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      Workshop: Trends in Computational Molecular Biophysics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Transport mechanism of sodium/proton antiporter from transition-path simulations2018

    • Author(s)
      Kei-ichi Okazaki
    • Organizer
      the 2nd workshop on Advances in Theory and Computation of Complex Systems --- Biological Systems
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] トランスポーターがイオンを輸送する瞬間のシミュレーションに成功 ―高速トランスポーターをデザイン―

    • URL

      https://www.ims.ac.jp/news/2019/04/17_4308.html

    • Related Report
      2019 Annual Research Report

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

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