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Exploring the molecular mechanism of the membrane lipid dependent gating of ion channels

Research Project

Project/Area Number 17K07360
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biophysics
Research InstitutionUniversity of Fukui

Principal Investigator

Iwamoto Masayuki  福井大学, 学術研究院医学系部門, 教授 (40452122)

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: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywordsチャネル / 膜 / 脂質
Outline of Final Research Achievements

In this study, we examined the effects of membrane lipids on the function of a prototypical ion channel, the KcsA potassium channel. We developed a methodology for the instantaneous exchange of the lipid composition of the lipid bilayer (membrane perfusion) based on our original lipid bilayer technique, the CBB method. Using the membrane perfusion, we found for the first time that cholesterol affected the open-close behavior of the KcsA channel. We revealed that the cholesterol effect originated from indirect action of cholesterol, i.e., reduction of the membrane tension.

Academic Significance and Societal Importance of the Research Achievements

細胞膜は細胞内外を区切る隔壁としてだけではなく、細胞膜に組み込まれたタンパク質の働きを調節する役割も併せ持つことが明らかになってきている。それがどの様なメカニズムによるものなのか、未だ全体像が捉えられていない。本研究では膜コレステロールによる調節メカニズムの一端を、代表的な膜タンパク質・イオンチャネルを使って明らかにすることができた。膜タンパク質は医薬品の作用標的、あるいは、生体センサー素子として注目されているが、本研究成果はその調節メカニズムと関連するものであり、学術的な観点だけではなく創薬や産業への応用も期待できる。

Report

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

    (26 results)

All 2020 2019 2018 2017 Other

All Journal Article (12 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 10 results,  Open Access: 4 results) Presentation (12 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] In bulla functional channel expression systems that mimic bacterial synthetic membranes2019

    • Author(s)
      Iwamoto Masayuki、Oiki Shigetoshi
    • Journal Title

      Methods Enzymol.

      Volume: 621 Pages: 231-244

    • DOI

      10.1016/bs.mie.2019.02.011

    • ISBN
      9780128181171
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Drop-in-well chamber for droplet interface bilayer with built-in electrodes2019

    • Author(s)
      Urakubo Kazuhiro、Iwamoto Masayuki、Oiki Shigetoshi
    • Journal Title

      Methods Enzymol.

      Volume: 621 Pages: 347-363

    • DOI

      10.1016/bs.mie.2019.02.012

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A tension-modulated modality of the KcsA channel exclusive for acid-activated state2019

    • Author(s)
      Iwamoto M, Oiki S
    • Journal Title

      J. Physiol. Sci.

      Volume: 69 suppl. Pages: i-312

    • DOI

      10.1007/s12576-019-00673-w

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Lipid Bilayer Experiments with Contact Bubble Bilayers for Patch-Clampers2019

    • Author(s)
      Iwamoto Masayuki、Oiki Shigetoshi
    • Journal Title

      J. Vis. Exp.

      Volume: 143 Issue: 143

    • DOI

      10.3791/58840

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Constitutive boost of a K+ channel via inherent bilayer tension and a unique tension-dependent modality2018

    • Author(s)
      Iwamoto Masayuki、Oiki Shigetoshi
    • Journal Title

      Proc. Natl. Acad. Sci. U. S. A.

      Volume: 115 Issue: 51 Pages: 13117-13122

    • DOI

      10.1073/pnas.1812282115

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Lipid Bilayers Manipulated through Monolayer Technologies for Studies of Channel-Membrane Interplay2018

    • Author(s)
      Oiki S, Iwamoto M
    • Journal Title

      Biological and Pharmaceutical Bulletin

      Volume: 41 Issue: 3 Pages: 303-311

    • DOI

      10.1248/bpb.b17-00708

    • NAID

      130006407489

    • ISSN
      0918-6158, 1347-5215
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Concurrent In Vitro Synthesis and Functional Detection of Nascent Activity of the KcsA Channel under a Membrane Potential2018

    • Author(s)
      Iwamoto M, Elfaramawy MA, Yamatake M, Matsuura T, Oiki S
    • Journal Title

      ACS Synthetic Biology

      Volume: 7 Issue: 4 Pages: 1004-1011

    • DOI

      10.1021/acssynbio.7b00454

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Thylakoid membranes contain a non-selective channel permeable to small organic molecules2018

    • Author(s)
      Kojima S, Iwamoto M, Oiki S, Tochigi S, Takahashi H
    • Journal Title

      Journal of Biological Chemistry

      Volume: 印刷中 Issue: 20 Pages: 7777-7785

    • DOI

      10.1074/jbc.ra118.002367

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Membrane tension-assisted gating of the KcsA potassium channel revealed by the membrane sterol effects2018

    • Author(s)
      Iwamoto M, Oiki S
    • Journal Title

      The Journal of Physiological Sciences

      Volume: 68 suppl

    • Related Report
      2017 Research-status Report
  • [Journal Article] Membrane Perfusion of Hydrophobic Substances Around Channels Embedded in the Contact Bubble Bilayer2017

    • Author(s)
      Iwamoto M, Oiki S
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 6857-6857

    • DOI

      10.1038/s41598-017-07048-4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Channel Formation and Membrane Deformation via Sterol-Aided Polymorphism of Amphidinol 32017

    • Author(s)
      Iwamoto M, Sumino A, Shimada E, Kinoshita M, Matsumori N, Oiki S
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 10782-10782

    • DOI

      10.1038/s41598-017-11135-x

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Contact Bubble Bilayer Method as a Hybrid of the Planar Lipid Bilayer and Patch-clamp Methods2017

    • Author(s)
      岩本真幸,老木成稔
    • Journal Title

      Seibutsu Butsuri

      Volume: 57 Issue: 6 Pages: 313-317

    • DOI

      10.2142/biophys.57.313

    • NAID

      130006230295

    • ISSN
      0582-4052, 1347-4219
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 最新の人工膜実験法を用いたイオンチャネル機能に対する脂質二重膜効果の解明2020

    • Author(s)
      岩本真幸
    • Organizer
      第97回日本生理学会大会シンポジウム「立体構造と先端的手法から探る、膜機能タンパク質の精緻・動的な作動原理
    • Related Report
      2019 Annual Research Report
  • [Presentation] 人工細胞膜を使ってイオンチャネルの仕組みを探る2019

    • Author(s)
      岩本真幸
    • Organizer
      令和元年度福井大学ライフサイエンスイノベーションセンター研究交流会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 油中水滴接触膜張力の定量的操作法とチャネル研究への応用2019

    • Author(s)
      岩本真幸、老木成稔
    • Organizer
      日本生物物理学会第57回年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 生体膜の特性が支えるイオンチャネル活性2019

    • Author(s)
      岩本真幸
    • Organizer
      生理研研究会「イオンチャネルと生体膜のダイナミズム:構造生物学の先にあるもの」
    • Related Report
      2019 Annual Research Report
  • [Presentation] 油中水滴接触膜法を応用した膜張力の定量的操作法の開発2019

    • Author(s)
      岩本真幸、老木成稔
    • Organizer
      第66回中部日本生理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] A tension-modulated modality of the KcsA channel exclusive for acid-activated state2019

    • Author(s)
      Iwamoto Masayuki、Oiki Shigetoshi
    • Organizer
      第9回アジア・オセアニア生理学会連合大会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] ステロールによる膜張力を介したKcsAカリウムチャネル活性の制御(Regulation of the activity of the KcsA potassium channel via bilayer tension-mediated sterol action)2018

    • Author(s)
      岩本真幸、老木成稔
    • Organizer
      日本生物物理学会第56回年会
    • Related Report
      2018 Research-status Report
  • [Presentation] Tension-mediated regulation of the KcsA channel: a novel dual modality of the channel activation2018

    • Author(s)
      Iwamoto Masayuki、Oiki Shigetoshi
    • Organizer
      第49回生理研国際シンポジウム
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Method for rapid perfusion of hydrophobic substances into lipid bilayer and its application for ion channel studies2018

    • Author(s)
      Iwamoto M, Oiki S
    • Organizer
      Biophysical Society 62th Annual Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 膜ステロール効果の解析から明らかになったKcsAカリウムチャネル開閉に対する膜張力の寄与(Membrane tension-assisted gating of the KcsA potassium channel revealed by the membrane sterol effects)2018

    • Author(s)
      岩本真幸、老木成稔
    • Organizer
      第95回日本生理学会大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 膜脂質組成とKcsAチャネル開閉2017

    • Author(s)
      岩本真幸
    • Organizer
      第2回 イオンチャネル研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] 脂質二重膜がカリウムチャネル開閉に及ぼす多様な影響(Specific and non-specific actions of membrane lipids on the gating of the potassium channel)2017

    • Author(s)
      岩本真幸、老木成稔
    • Organizer
      日本生物物理学会第55回年会 シンポジウム「いろんなスケールで働く膜タンパク質の作動原理:実験と理論の新展開
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] 福井大学医学部分子生理学(生理学1)研究室

    • URL

      http://seiri1.med.lab.u-fukui.ac.jp/

    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] 脂質二重膜形成器2017

    • Inventor(s)
      老木成稔、岩本真幸
    • Industrial Property Rights Holder
      国立大学法人福井大学
    • Industrial Property Rights Type
      意匠
    • Filing Date
      2017
    • Acquisition Date
      2017
    • Related Report
      2017 Research-status Report

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

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