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Unnatural amino acid-based state-specific analysis of ion channels

Research Project

Project/Area Number 20K07284
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48020:Physiology-related
Research InstitutionNational Institute for Physiological Sciences

Principal Investigator

Shimomura Takushi  生理学研究所, 分子細胞生理研究領域, 助教 (50635464)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsイオンチャネル / 電位依存性 / 非天然アミノ酸 / 電気生理学 / 構造生物学 / 光生理学 / 膜タンパク質
Outline of Research at the Start

本研究では、光架橋性非天然アミノ酸(pcUAA)をイオンチャネルに導入し、特定の状態を “狙って”機能・構造解析する手法を開発・実証する。pcUAAは光照射により近傍のアミノ酸残基と非特異的な共有結合を形成することができるので、各種刺激によるチャネルの状態遷移(活性化・脱活性化など)と光照射による架橋とを厳密に制御して組み合わせることで、より特定の状態を指向した解析が可能になる。このpcUAAの利点を既存の機能・構造解析手法と組み合わせることで、イオンチャネルの構造機能連関についての新たな知見を得ることを目指す。

Outline of Final Research Achievements

In this study, we aimed to develop and demonstrate a method to "target" a specific state by introducing a photocrosslinking unnatural amino acid (pcUAA) into an ion channel. Several pcUAA-introduced mutants of the S4 helix in the voltage sensor domain of Kv1.2, a voltage-gated potassium channel, were irradiated with UV light simultaneously with current measurements to observe changes in channel activity. Some of the pcUAA-introduced mutants were found to be more sensitive to cross-link formation when the S4 helix was in a resting state. This result provided a new insight into the mechanism of channel activation in voltage-gated ion channel.

Academic Significance and Societal Importance of the Research Achievements

Kv1.2を含む電位依存性イオンチャネルは、われわれの脳や末梢神経における電気信号を生み出す基本単位であり、その分子機能・構造についての理解は生理学的に重要である。本研究の結果、Kv1.2のS4ヘリックスの構造変化についての知見が得られた。構造解析技術の発展にもかかわらず、高分解能のKv1.2の静止状態の構造は明確に得られておらず、電位依存的な活性化メカニズムは完全には理解されていない。pcUAAを利用した本研究の結果は、その活性化メカニズムについての新しい知見を提供するものである。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2023 2022 2021

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (5 results) (of which Invited: 1 results)

  • [Journal Article] Conformational rearrangements in the second voltage sensor domain switch PIP2- and voltage-gating modes in two-pore channels2023

    • Author(s)
      Shimomura T, Hirazawa K, Kubo Y
    • Journal Title

      Proc Natl Acad Sci USA

      Volume: 120(6) Issue: 6

    • DOI

      10.1073/pnas.2209569120

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dopamine drives neuronal excitability via KCNQ channel phosphorylation for reward behavior2022

    • Author(s)
      Tsuboi Daisuke、Otsuka Takeshi、Shimomura Takushi、Faruk Md Omar、Yamahashi Yukie、Amano Mutsuki、Funahashi Yasuhiro、Kuroda Keisuke、Nishioka Tomoki、Kobayashi Kenta、Sano Hiromi、Nagai Taku、Yamada Kiyofumi、Tzingounis Anastasios V.、Nambu Atsushi、Kubo Yoshihiro、Kawaguchi Yasuo、Kaibuchi Kozo
    • Journal Title

      Cell Reports

      Volume: 40 Issue: 10 Pages: 111309-111309

    • DOI

      10.1016/j.celrep.2022.111309

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Closed-state inactivation of cardiac, skeletal, and neuronal sodium channels is isoform specific2022

    • Author(s)
      Brake N, Mancino AS, Yan Y, Shimomura T, Kubo Y, Khadra A, Bowie D
    • Journal Title

      J Gen Physiol

      Volume: 154(7) Issue: 7

    • DOI

      10.1085/jgp.202112921

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Phosphoinositide regulates dynamic movement of the S4 voltage sensor in the second repeat in two-pore channel 32021

    • Author(s)
      Hirazawa Kiichi、Tateyama Michihiro、Kubo Yoshihiro、Shimomura Takushi
    • Journal Title

      Journal of Biological Chemistry

      Volume: 297 Issue: 6 Pages: 101425-101425

    • DOI

      10.1016/j.jbc.2021.101425

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Mechanism of hERG inhibition by gating-modifier toxin, APETx1, deduced by functional characterization2021

    • Author(s)
      Matsumura Kazuki、Shimomura Takushi、Kubo Yoshihiro、Oka Takayuki、Kobayashi Naohiro、Imai Shunsuke、Yanase Naomi、Akimoto Madoka、Fukuda Masahiro、Yokogawa Mariko、Ikeda Kazuyoshi、Kurita Jun-ichi、Nishimura Yoshifumi、Shimada Ichio、Osawa Masanori
    • Journal Title

      BMC Molecular and Cell Biology

      Volume: 22 Issue: 1 Pages: 1-16

    • DOI

      10.1186/s12860-020-00337-3

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Two-pore channelにおける2番目のS4ヘリックスの状態に依存したPIP2および電位依存性ゲーティングの切り替え機構2023

    • Author(s)
      下村拓史、平澤輝一、久保義弘
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 遷移金属イオン蛍光共鳴エネルギー移動を利用した電位依存性カチオンチャネルの動的構造解析2023

    • Author(s)
      平澤輝一、下村拓史、久保義弘
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 膜電位下蛍光電流同時測定法により明らかになった、Two-pore Channelにおけるリガンド依存性と電位依存性ゲーティングの切り替え・統合の分子基盤2022

    • Author(s)
      下村拓史
    • Organizer
      第95回日本生化学会大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Analysis of the relationship between channel opening and position of the second S4 helix in two-pore Na+ channel 32022

    • Author(s)
      下村拓史、平澤輝一、久保義弘
    • Organizer
      第99回日本生理学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Cysteine scanning analysis of the 2nd S4 in two-pore Na+ channel 32021

    • Author(s)
      下村拓史、平澤喜一、久保義弘
    • Organizer
      第126回日本解剖学会総会・全国学術集会・ 第98回日本生理学会大会 合同大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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