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structural basis of channelization of Na+-pump by palytoxin

Research Project

Project/Area Number 16K18500
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Structural biochemistry
Research InstitutionThe University of Tokyo

Principal Investigator

Kanai Ryuta  東京大学, 定量生命科学研究所, 助教 (50598472)

Research Collaborator Vilsen Bente  
Cornelius Flemming  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsNa+,K+-ATPase / パリトキシン / X線結晶構造解析 / イオン能動輸送 / 膜蛋白質 / Na+ポンプ / イオンポンプ / イオンの能動輸送
Outline of Final Research Achievements

Palytoxin, a marine toxin, targets a sodium pump that transports sodium ions to external and potassium ions to cytoplasm. Palytoxin interferes with the pumping of a sodium pump and forces it to become an ion channel. Here, in order to elucidate the mechainsm of a sodium pump inhibition induced by palytoxin, I performed a crystallographic analysis of palytoxin-bound sodium pump. The result showed that palytoxin is bound to the extracellular side of the ion pathway of the sodium pump and makes the extracellular gate opened.

Academic Significance and Societal Importance of the Research Achievements

本研究成果は根本的治療法がないパリトキシン中毒に対する薬剤デザインに大きく役立つものです。また、本研究成果は、本来、ポンプとして機能するはずのナトリウムポンプはなぜ、パリトキシンの結合によってチャネル化するのか、言い換えれば、ポンプとして機能するためには何が大事か、というイオン能動輸送に対する基本的な理解に役立ちました。

Report

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

    (4 results)

All 2018 2017

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Suppressor mutation analysis combined with 3D modeling explains cohesin’s capacity to hold and release DNA2018

    • Author(s)
      Xu Xingya、Kanai Ryuta、Nakazawa Norihiko、Wang Li、Toyoshima Chikashi、Yanagida Mitsuhiro
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 115 Issue: 21

    • DOI

      10.1073/pnas.1803564115

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] BHQ誘導体と結合したカルシウムポンプの結晶構造解析2018

    • Author(s)
      金井隆太、中路絢美、淡島美香、乗松良行、豊島近
    • Organizer
      第91回日本生化学会大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Crystal structures of Na+,K+-ATPase revisited2017

    • Author(s)
      Ryuta Kanai, Bente Vilsen, Flemming Cornelius, Chikashi Toyoshima
    • Organizer
      The 15th International Conference on Na,K-ATPase Related Transport ATPases
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Visualization of the lipid bilayer in crystals of ion pumps2017

    • Author(s)
      金井隆太、杖田淳子、中路絢美、小川治夫、椛島佳樹、豊島近
    • Organizer
      第90回日本生化学会大会
    • Related Report
      2017 Research-status Report

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

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