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Gating mechanism of the bacterial flagellar protein export apparatus

Research Project

Project/Area Number 20K15749
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43030:Functional biochemistry-related
Research InstitutionOsaka University

Principal Investigator

Kinoshita Miki  大阪大学, 生命機能研究科, 特任助教(常勤) (30790985)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords細菌 / 蛋白質 / 電子顕微鏡 / 感染症 / 遺伝学
Outline of Research at the Start

バクテリアの運動器官であるべん毛を構築するために必要な蛋白質輸送装置は5種類の膜蛋白質FlhA, FlhB, FliP, FliQ, FliRからなる輸送ゲート複合体と、3種類の可溶性蛋白質FliH, FliI, FliJからなるATPaseリング複合体から構成される。べん毛蛋白質輸送装置はATPと細胞膜内外に形成される水素イオンの電気化学ポテンシャル差をエネルギーに利用してべん毛構成蛋白質を細胞外へ送り出す。しかしながら、その分子メカニズムについては未だ不明である。本研究では、エネルギー共役の本質的な部分を担うFlhAとFlhBの機能と構造を原子レベルで解明すること目指す。

Outline of Final Research Achievements

The bacterial flagellar protein export apparatus is located at the base of the flagellum and is composed of a transmembrane export gate complex powered by proton motive force (PMF) across the cytoplasmic membrane and a cytoplasmic ATPase ring complex, which acts as an activator of the export gate complex. The export gate complex couples inward-directed proton flow through a transmembrane proton channel with protein translocation into a protein export channel. To clarify the gating mechanism of the flagellar export apparatus, I have provided experimental evidence that dynamic interactions of FlhA and FlhB with the ATPase ring complex allow the export gate complex to open both the proton and protein export channels in a PMF-dependent manner, thereby facilitating proton-coupled protein.

Academic Significance and Societal Importance of the Research Achievements

サルモネラなどの病原細菌による感染症は社会問題の一つで、それらの感染機構の解明ならびに克服のための方法の探索が続けられている。べん毛タンパク質輸送装置と高い相同性を示すIII型分泌装置が急性胃腸炎の発症に深く関わっている。本研究成果に基づいて病原細菌のIII型分泌装置のゲート開閉機構を特異的に不活性化できれば、病原細菌の病原性のみを破壊できる。したがって、従来の抗菌剤のように細菌を死滅させることがないため耐性菌が発生しづらく、これまでにない新しい治療法の開発につながる。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (9 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 8 results) Presentation (2 results) (of which Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] ユタ大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ユタ大学(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] 南京農業大学(中国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Conserved GYXLI motif of FlhA is involved in dynamic domain motions of FlhA required for flagellar protein export2022

    • Author(s)
      Minamino Tohru、Kinoshita Miki、Inoue Yumi、Kitao Akio、Namba Keiichi
    • Journal Title

      bioRxiv

      Volume: 20220325 Pages: 485897-485897

    • DOI

      10.1101/2022.03.25.485897

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] A positive charge region of Salmonella FliI is required for ATPase formation and efficient flagellar protein export.2021

    • Author(s)
      Kinoshita M, Namba K, Minamino T.
    • Journal Title

      Commun. Biol.

      Volume: 4 Issue: 1 Pages: 464-464

    • DOI

      10.1038/s42003-021-01980-y

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Membrane voltage-dependent activation mechanism of the bacterial flagellar protein export apparatus2021

    • Author(s)
      Minamino Tohru、Morimoto Yusuke V.、Kinoshita Miki、Namba Keiichi
    • Journal Title

      Proc. Natl. Acad. Sci. USA.

      Volume: 118 Issue: 22

    • DOI

      10.1073/pnas.2026587118

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Native flagellar MS ring is formed by 34 subunits with 23-fold and 11-fold subsymmetries2021

    • Author(s)
      Kawamoto Akihiro、Miyata Tomoko、Makino Fumiaki、Kinoshita Miki、Minamino Tohru、Imada Katsumi、Kato Takayuki、Namba Keiichi
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 4223-4223

    • DOI

      10.1038/s41467-021-24507-9

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multiple Roles of Flagellar Export Chaperones for Efficient and Robust Flagellar Filament Formation in Salmonella2021

    • Author(s)
      Minamino Tohru、Morimoto Yusuke V.、Kinoshita Miki、Namba Keiichi
    • Journal Title

      Frontiers in Microbiology

      Volume: 12 Pages: 756044-756044

    • DOI

      10.3389/fmicb.2021.756044

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two distinct conformations in 34 FliF subunits generate three different symmetries within the flagellar MS-ring2021

    • Author(s)
      Takekawa N, Kawamoto A, Sakuma M, Kato T, Kojima S, Kinoshita M, Minamino T, Namba K, Homma M, Imada K.
    • Journal Title

      mBio

      Volume: 12 Issue: 2

    • DOI

      10.1128/mbio.03199-20

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The FlgN chaperone activates the Na+-driven engine of the Salmonella flagellar protein export apparatus2021

    • Author(s)
      Minamino T, Kinoshita M, Morimoto YV, Namba K.
    • Journal Title

      Commun. Biol.

      Volume: 4 Issue: 1 Pages: 335-335

    • DOI

      10.1038/s42003-021-01865-0

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The homologous components of flagellar type III protein apparatus have acquired a novel function to control twitching motility in a non-flagellated biocontrol bacterium2020

    • Author(s)
      Fulano AM, Shen D, Kinoshita M, Chou SH, Qian G.
    • Journal Title

      Biomolecules

      Volume: 10 Issue: 5 Pages: 733-733

    • DOI

      10.3390/biom10050733

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Molecular Organization and Assembly of the Export Apparatus of Flagellar Type III Secretion Systems2019

    • Author(s)
      Minamino Tohru、Kawamoto Akihiro、Kinoshita Miki、Namba Keiichi
    • Journal Title

      Current Topics in Microbiology and Immunology

      Volume: 1 Pages: 1-17

    • DOI

      10.1007/82_2019_170

    • ISBN
      9783030521226, 9783030521233
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Multiple roles of flagellar export chaperones for flagellar filament formation in Salmonella.2022

    • Author(s)
      Minamino, T., Morimoto, Y.V., Kinoshita, M. & Namba, K.
    • Organizer
      日本細菌学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Gating mechanism of the bacterial flagellar protein export engine (バクテリアべん毛蛋白質輸送エンジンのゲート開閉機構)2020

    • Author(s)
      Kinoshita M, Miyata T, Kato T, Namba K, Minamino T.
    • Organizer
      第58回日本生物物理学会年会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Remarks]

    • URL

      https://www.fbs.osaka-u.ac.jp/ja/research_group/detail/24

    • Related Report
      2021 Annual Research Report
  • [Remarks]

    • URL

      https://www.fbs.osaka-u.ac.jp/ja/research_group/detail/24

    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2023-01-30  

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