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Reconstitution of the molecular machinery of intracellular membrane tethering and fusion

Research Project

Project/Area Number 17K07386
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Cell biology
Research InstitutionOsaka University

Principal Investigator

Mima Joji  大阪大学, 蛋白質研究所, 准教授 (30335301)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords膜交通 / 小胞輸送 / 膜融合 / 膜テザリング / Rab / SNARE / 低分子量Gタンパク質 / 細胞内膜交通 / 細胞内小胞輸送 / Small GTPase / 再構成 / プロテオリポソーム / メンブレントラフィック / Rab GTPase / small GTPase
Outline of Final Research Achievements

Membrane tethering and fusion processes are a highly regulated event that occurs during the physical contact and merging between transport carriers and target membrane compartments, thereby ensuring the spatiotemporal specificity of intracellular membrane trafficking. Nevertheless, how essential protein components, such as SNARE-family proteins and Rab-family small GTPases, directly act upon the tethering and fusion events remains enigmatic. Here, we investigated the molecular basis of membrane tethering and fusion by comprehensively and quantitatively evaluating the intrinsic capacities of representative human Rab-family proteins and yeast SNARE-family proteins to physically tether or fuse two distinct membranes in a chemically defined reconstitution system. Comprehensive reconstitution experiments provided novel mechanistic insights into Rab-mediated membrane tethering and SNARE-mediated membrane fusion reactions.

Academic Significance and Societal Importance of the Research Achievements

ヒト細胞を含め全ての真核細胞は複雑な内膜系をもち、多種多様な物質を、各オルガネラや細胞外へと選択的に運搬している。この時空間的に高度に制御された細胞内物質輸送は、細胞内膜交通・小胞輸送と称され、正常な細胞機能に必要不可欠である。さらに、膜交通の必須因子で、本課題で対象とするRabおよびSNAREタンパク質群は、近年、ガンや神経変性疾患など、様々な疾病・疾患の発症に関与することも報告されている。本課題では、世界初の独自開発したヒト Rab再構成プロテオリポソーム解析系をはじめ、再構成アプローチを駆使することで、独創的な基礎研究の成果を生み出している。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2020 2019 2018 2017

All Journal Article (5 results) (of which Peer Reviewed: 5 results) Presentation (5 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Journal Article] Curvature-sensitive trans-assembly of human Atg8-family proteins in autophagy-related membrane tethering2020

    • Author(s)
      Taniguchi S, Toyoshima M, Takamatsu T, Mima J
    • Journal Title

      Protein Sci

      Volume: - Issue: 6 Pages: 1387-1400

    • DOI

      10.1002/pro.3828

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Homotypic and heterotypic trans-assembly of human Rab-family small GTPases in reconstituted membrane tethering2019

    • Author(s)
      Segawa K, Tamura N, Mima J
    • Journal Title

      J Biol Chem

      Volume: 294 Issue: 19 Pages: 7722-7739

    • DOI

      10.1074/jbc.ra119.007947

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Reconstituted Proteoliposome Fusion Mediated by Yeast SNARE-Family Proteins2019

    • Author(s)
      Mima J
    • Journal Title

      Methods Mol Biol

      Volume: 1860 Pages: 303-322

    • DOI

      10.1007/978-1-4939-8760-3_20

    • ISBN
      9781493987597, 9781493987603
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Human Rab small GTPase? and class V myosin?mediated membrane tethering in a chemically defined reconstitution system2017

    • Author(s)
      Inoshita Motoki、Mima Joji
    • Journal Title

      Journal of Biological Chemistry

      Volume: 292 Issue: 45 Pages: 18500-18517

    • DOI

      10.1074/jbc.m117.811356

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Reconstitution of membrane tethering mediated by Rab-family small GTPases2017

    • Author(s)
      Mima Joji
    • Journal Title

      Biophysical Reviews

      Volume: 10 Issue: 2 Pages: 543-549

    • DOI

      10.1007/s12551-017-0358-3

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] ヒトRabファミリー低分子量Gタンパク質が駆動する細胞内膜テザリング反応の再構成2019

    • Author(s)
      三間 穣治
    • Organizer
      第92回日本生化学会大会,シンポジウム「イメージングと再構築による生体膜ダイナミクスの理解:変形と融合と輸送と切断」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Reconstitution of homotypic and heterotypic membrane tethering mediated by human Rab-family small GTPases2019

    • Author(s)
      Joji Mima
    • Organizer
      Gordon Research Conference “Molecular Membrane Biology”
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Reconstituted membrane tethering mediated by human Rab-family small GTPases in a chemically defined system2018

    • Author(s)
      Joji Mima
    • Organizer
      Molecular Mechanisms of Membrane Trafficking, May 17-19, 2018, Seoul National University,
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Rab GTPase- and class V myosin-dependent membrane tethering in a chemically defined system2017

    • Author(s)
      Joji MIMA
    • Organizer
      GORDON RESEARCH CONFERENCE on “Molecular Membrane Biology”
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rab-family GTPase- and class V myosin-mediated membrane tethering in a chemically defined reconstitution system2017

    • Author(s)
      Joji MIMA
    • Organizer
      The 1st International Symposium on Cell Logistics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2021-02-19  

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