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Analyses of the structure-function relationship based on the characteristic interaction among the intracellular domains in the hERG channel

Research Project

Project/Area Number 19K16491
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 48020:Physiology-related
Research InstitutionOita University

Principal Investigator

Kume Shinichiro  大分大学, 医学部, 助教 (90794579)

Project Period (FY) 2019-04-01 – 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 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsイオンチャネル / hERGチャネル / 構造機能連関 / 分子生物学 / 電気生理学
Outline of Research at the Start

細胞膜の電位変化に応じて、細胞内外のカリウムイオンを受動的に輸送する電位作動性カリウムチャネル(Kv)の1つであるhERGチャネルは、ヒト心臓の拍動リズムの調節に寄与しており、その機能不全は心疾患の原因として知られる。このhERGチャネルは、他のKvには見られない独自の分子構造(Non-domain swapped構造)をとり、それに伴い細胞内の構造(ドメイン)間にも独自の相互作用が存在する。この相互作用はhERGチャネルが正常に機能するうえで重要な役割をもつ可能性がある。そこで、本研究ではこの相互作用の解析を中心に、hERGチャネル独自の分子構造と機能の関係性の解明を目指す。

Outline of Final Research Achievements

The hERG channel is a member of voltage-gated potassium channel and has a unique assembly "Non-domain swapped structure" which supposedly interacts between the voltage sensor domain (VSD) and a pore domain (PD) in the same domain. In this study, I demonstrated the features of the intracellular domains associated with this characteristic structure; the direct interaction of S4-S5 linker domain located between VSD and PD with C-linker domain in C-terminal region, which suggests that this intracellular interaction plays an important role in slow deactivation.
In addition, I applied the experiment technique of this study and analyzed the effects of drugs on this channel.

Academic Significance and Societal Importance of the Research Achievements

hERGチャネルはヒト心室筋の活動電位における再分極の調節に関与しており、心臓の正常な生理機能において極めて重要な役割を担う。そのため、遺伝子の異常や薬剤の投与により機能不全が生じると、心室性不整脈や突然死のリスクを伴うQT延長症候群のような疾患の原因となり得ることが知られている。本研究により得られたhERGチャネルの構造機能連関に関する成果や薬物投与の影響に関する成果は、イオンチャネル研究の発展に役立つだけでなく、このようなヒト心臓の疾患に対する予防や治療への貢献も期待できる。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (11 results)

  • [Journal Article] Electrophysiological evaluation of an anticancer drug gemcitabine on cardiotoxicity revealing down-regulation and modification of the activation gating properties in the human rapid delayed rectifier potassium channel2023

    • Author(s)
      Wei Mengyan、Wang Pu、Zhu Xiufang、Morishima Masaki、Liu Yangong、Zheng Mingqi、Liu Gang、Osanai Hiroki、Yoshimura Kenshi、Kume Shinichiro、Kurokawa Tatsuki、Ono Katsushige
    • Journal Title

      PLOS ONE

      Volume: 18 Issue: 2 Pages: e0280656-e0280656

    • DOI

      10.1371/journal.pone.0280656

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Disruption of asparagine-linked glycosylation to rescue and alter gating of the Nav1.5-Na+ channel2021

    • Author(s)
      Wang P, Zhu X, Wei M, Liu Y, Yoshimura K, Zheng M, Liu G, Kume S, Kurokawa T, Ono K
    • Journal Title

      Heart and Vessels

      Volume: 36 Issue: 4 Pages: 589-596

    • DOI

      10.1007/s00380-020-01736-4

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nitric oxide down-regulates voltage-gated Na+ channel in cardiomyocytes possibly through S-nitrosylation-mediated signaling2021

    • Author(s)
      Wang P, Wei M, Zhu X, Liu Y, Yoshimura K, Zheng M, Liu G, Kume S, Morishima M, Kurokawa T, Ono K
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 11273-11273

    • DOI

      10.1038/s41598-021-90840-0

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Asparagine-linked glycosylation modifies voltage-dependent gating properties of CaV3.1-T-type Ca2+ channel2019

    • Author(s)
      Liu Yangong、Wang Pu、Ma Fangfang、Zheng Mingqi、Liu Gang、Kume Shinichiro、Kurokawa Tatsuki、Ono Katsushige
    • Journal Title

      The Journal of Physiological Sciences

      Volume: 69 Issue: 2 Pages: 335-343

    • DOI

      10.1007/s12576-018-0650-4

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 細胞内Ca2+はMEK1,2-ERK1,2経路およびCaM-CaMK経路を介する転写制御作用によってhERGチャネル電流を調節する2022

    • Author(s)
      魏 孟厳、粂 慎一郎、小山内 博基、吉村 健司、黒川 竜紀、小野 克重
    • Organizer
      第73回西日本生理学会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 心筋細胞内Ca2+濃度の上昇はPKCとCaMKシグナルを介してhERGチャネル発現を制御する2021

    • Author(s)
      魏 孟厳、小山内博基、吉村健司、粂慎一郎、黒川竜紀、小野克重
    • Organizer
      第30回日本病態生理学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] An anti-cancer drug gemcitabine inhibits and modifies N-glycosylation of the hERG channel resulting in a suppression of IhERG2021

    • Author(s)
      Mengyan Wei, Kenshi Yoshimura, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第72回西日本生理学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Mechanisms of hERG channel current inhibition by an anticonvulsant valproic acid2021

    • Author(s)
      Shinichiro Kume, Xiufang Zhu, Pu Wang, Mengyan Wei, Kenshi Yoshimura, Tatsuki Kurokawa, Katsushige Ono
    • 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
  • [Presentation] An anticonvulsant valproate decreases hERG K+ channel current IKr through the histone deacetylase inhibition2020

    • Author(s)
      Xiufang Zhu, Pu Wang, Mengyan Wei, Kenji Yoshimura, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第71回西日本生理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] Asparagine-linked glycosylation as a key regulator of gating properties in cardiac Nav1.5 channels2020

    • Author(s)
      Pu Wang, Yangong Liu, Mengyan Wei, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第97回日本生理学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] α-mannosidase I-dependent N-linked glycosylation modifies distinct gating properties of the hERG channel2020

    • Author(s)
      Mengyan Wei, Yangong Liu, Pu Wang, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第97回日本生理学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] N-glycosylation inhibition attenuates heart automaticity by deranging T-type Ca2+ current and HCN current2020

    • Author(s)
      Yangong Liu, Pu Wang, Mengyan Wei, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第97回日本生理学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Asparagine-linked glycosylation modifies voltage-dependent gating properties of Cav3.1-T-type Ca2+ channel2020

    • Author(s)
      Shinichiro Kume, Yangong Liu, Pu Wang, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第97回日本生理学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] N-glycosylation inhibition attenuates heart automaticity by deranging T-type Ca2+ current and HCN current2019

    • Author(s)
      Yangong Liu, Pu Wang, Shinichiro Kume, Tatsuki Kurokawa, Katsushige Ono
    • Organizer
      第29回日本病態生理学会大会
    • Related Report
      2019 Research-status Report
  • [Presentation] hERGチャネルの細胞内ドメインに関するFRET解析を用いた構造機能連関の研究2019

    • Author(s)
      粂 慎一郎、下村 拓史、立山 充博、久保 義弘
    • Organizer
      第70回西日本生理学会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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