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Elucidating the molecular mechanism of voltage-gated K+ channel KCNQ2 involved in the neuronal excitability and epilepsy

Research Project

Project/Area Number 20H03200
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43020:Structural biochemistry-related
Research InstitutionJichi Medical University

Principal Investigator

KASUYA Go  自治医科大学, 医学部, 助教 (80845115)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Keywords電位依存性K+チャネル / KCND / KCNQ / 修飾サブユニット / イオンチャネル / 電位依存性チャネル / 構造生物学 / 電気生理学 / てんかん / 構造生物科学 / 生理学 / 電位依存性カリウムチャネル
Outline of Research at the Start

電位依存性K+チャネルKCNQ2は、良性から難治性まで様々な病態のてんかんの原因として知られる。KCNQ2の活性化には、膜リン脂質の一種であるPIP2の結合が必須であり、PIP2の結合がもたらす構造変化がチャネル開閉を可能にする。その一方で、てんかんの原因となるKCNQ2の変異は、PIP2の結合やチャネル開閉に必要な構造変化を阻害する。本研究では、クライオ電子顕微鏡法を用い、KCNQ2の構造を決定する。そして、チャネル活性を制御する仕組みや、KCNQ2の変異がチャネル活性に影響を与える仕組みを解明する。

Outline of Final Research Achievements

In this study, we investigated how voltage-gated K+ channels are modulated by their ligands or auxiliary subunits. In the case of KCNQ2, we are still determining its structure. In the case of KCND2, we determined the structure of KCND2 in complex with its auxiliary subunits KChIP1 and DPP6S and conducted structure-based electrophysiological analyses. In the case of KCNQ1, we revealed the mechanism of how KCNQ1 is modulated by its auxiliary subunit KCNE3 using voltage-clamp fluorometry.

Academic Significance and Societal Importance of the Research Achievements

電位依存性K+チャネルは、興奮性細胞における神経伝達や活動電位の形成、非興奮性細胞におけるK+リサイクルや恒常性維持など様々な機能に関わる重要な膜タンパク質である。電位依存性K+チャネルの多くはリガンドや修飾サブユニットなど多くの因子の調節を受け機能するが、その仕組みの多くは未だ不明である。本研究では、神経細胞間の情報伝達に関与するKCND2、上皮細胞のK+リサイクルに関与するKCNQ1について、それぞれ構造情報をもとに修飾サブユニットが機能を調節する仕組みを明らかにした。これらの情報は、立体構造や作動機構をもとにした薬剤開発などにつながることが期待される。

Report

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

    (7 results)

All 2023 2022 2021

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

  • [Journal Article] Cryo-EM structures of thylakoid-located voltage-dependent chloride channel VCCN12022

    • Author(s)
      Hagino Tatsuya、Kato Takafumi、Kasuya Go、Kobayashi Kan、Kusakizako Tsukasa、Hamamoto Shin、Sobajima Tomoaki、Fujiwara Yuichiro、Yamashita Keitaro、Kawasaki Hisashi、Maturana Andr?s D.、Nishizawa Tomohiro、Nureki Osamu
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 2505-2505

    • DOI

      10.1038/s41467-022-30292-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Optimized tight binding between the S1 segment and KCNE3 is required for the constitutively open nature of the KCNQ1-KCNE3 channel complex2022

    • Author(s)
      Kasuya Go、Nakajo Koichi
    • Journal Title

      eLife

      Volume: 11 Pages: 1-15

    • DOI

      10.7554/elife.81683

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recent Advances in the Structural Biology of the Volume-Regulated Anion Channel LRRC82022

    • Author(s)
      Kasuya Go、Nureki Osamu
    • Journal Title

      Frontiers in Pharmacology

      Volume: 13

    • DOI

      10.3389/fphar.2022.896532

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural basis of gating modulation of Kv4 channel complexes.2021

    • Author(s)
      Kise Y, Kasuya G, Okamoto HH, Yamanouchi D, Kobayashi K, Kusakizako T, Nishizawa T, Nakajo K, Nureki O.
    • Journal Title

      Nature

      Volume: 599 Issue: 7883 Pages: 158-164

    • DOI

      10.1038/s41586-021-03935-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Time-resolved serial femtosecond crystallography reveals early structural changes in channelrhodopsin2021

    • Author(s)
      Oda Kazumasa、Nomura Takashi、Nakane Takanori、Yamashita Keitaro、Inoue Keiichi、Ito Shota、Vierock Johannes、Hirata Kunio、Maturana Andres D、Katayama Kota、( 32 authers )、Kandori Hideki、Hegemann Peter、Iwata So、Kubo Minoru、Nishizawa Tomohiro、Nureki Osamu
    • Journal Title

      eLife

      Volume: 10 Pages: 1-21

    • DOI

      10.7554/elife.62389

    • NAID

      120006996980

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Proper interaction between the S1 segment of KCNQ1 and KCNE3 is required for the constitutively open nature of the KCNQ1-KCNE3 K+ channel complex.2023

    • Author(s)
      糟谷 豪
    • Organizer
      第100回 日本生理学会大会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] S1セグメントとKCNE3の適切な距離関係がKCNQ1-KCNE3 K+チャネルの常時開状態化に重要である2022

    • Author(s)
      糟谷豪、中條浩一
    • Organizer
      第99回 日本生理学会大会
    • Related Report
      2021 Annual Research Report

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

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