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Detection of molecular configuration of ion channel complexes in vivo and elucidation of their physiological functions

Research Project

Project/Area Number 21K06786
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 48020:Physiology-related
Research InstitutionJichi Medical University

Principal Investigator

NAKAJO Koichi  自治医科大学, 医学部, 教授 (80390699)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsイオンチャネル / 複合体 / 修飾サブユニット / カリウムチャネル / QT延長症候群 / 電位センサー / ゼブラフィッシュ / 電気生理学 / 電位依存性カリウムチャネル / KCNQ1チャネル / 心臓 / 電位センサードメイン / KCNE / HCN4チャネル / 全反射蛍光顕微鏡 / 1分子イメージング
Outline of Research at the Start

イオンチャネルの多くは、複数種類のサブユニットからなる複合体を構成し、機能を獲得することが知られている。しかしその知見の多くは、主に強制発現系を用いた研究の成果によるものであり、実際の生体内でどのような複合体を構成しているかについては不明な点が多い。本研究は、特に電位依存性K+チャネルKCNQ1とその修飾サブユニットKCNEに注目し、生体における複合体構成ならびに生理機能を明らかにすることが目的である。KCNQ1チャネルを制御する各種KCNEをゼブラフィッシュの心臓に発現させ、生体内での複合体構成を調べたうえで、心臓の生理機能がKCNEの発現によってどのように調節されるかを明らかにする。

Outline of Final Research Achievements

In vivo, KCNQ1 channels form complexes with auxiliary subunits called KCNEs that significantly alter their function. In this study, we found that KCNE3, which is expressed in some epithelial cells, and KCNE1, which is mainly expressed in the heart, interact with the S1 segment of the KCNQ1 channel, which is important for modifying channel function. We also found that the newly identified KCNE6 gene is widely distributed in non-eutherian vertebrates and, like KCNE1, is expressed in the heart.

Academic Significance and Societal Importance of the Research Achievements

KCNQ1は心臓ではQT延長症候群や難聴の原因遺伝子であり、ヒトの生理学に非常に重要である。今回の成果により、KCNQ1がKCNE1やKCNE3の結合によりどのように機能修飾されるかを、構造情報を基に明らかにしたことで、KCNQ1の変異によりどのようにQT延長症候群などの疾患が引き起こされるかを理解する手がかりになりうる。またヒトでは機能していないKCNE6ではあるが、KCNE1、KCNE3の機能修飾メカニズムを明らかにする手がかりとなる可能性があるため、その学術的意義は大きい。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (25 results)

All 2024 2023 2022 2021 Other

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 5 results) Presentation (16 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results) Remarks (3 results)

  • [Journal Article] Modulation of potassium channels by transmembrane auxiliary subunits via voltage‐sensing domains2024

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

      Physiological Reports

      Volume: 12 Issue: 6

    • DOI

      10.14814/phy2.15980

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] History and outlook of voltage-gated potassium channel research2023

    • Author(s)
      中條 浩一
    • Journal Title

      生化学

      Volume: 95 Issue: 3 Pages: 296-309

    • DOI

      10.14952/SEIKAGAKU.2023.950296

    • ISSN
      0037-1017
    • Year and Date
      2023-06-25
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dual allosteric modulation of voltage and calcium sensitivities of the Slo1-LRRC channel complex2023

    • Author(s)
      Yamanouchi Daichi、Kasuya Go、Nakajo Koichi、Kise Yoshiaki、Nureki Osamu
    • Journal Title

      Molecular Cell

      Volume: 83 Issue: 24 Pages: 4555-4569.e4

    • DOI

      10.1016/j.molcel.2023.11.005

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two HCN4 Channels Play Functional Roles in the Zebrafish Heart2022

    • Author(s)
      Liu Jiaying、Kasuya Go、Zempo Buntaro、Nakajo Koichi
    • Journal Title

      Frontiers in Physiology

      Volume: 13 Pages: 1-19

    • DOI

      10.3389/fphys.2022.901571

    • Related Report
      2022 Research-status 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 Research-status 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 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Structure-guided approach to elucidate modulation of voltage-gated potassium channels through voltage-sensing domain by auxiliary subunits2024

    • Author(s)
      Koichi Nakajo, Go Kasuya
    • Organizer
      日本生理学会 第101回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Interaction sites required for the KCNQ1 channel inhibition by KCNE42024

    • Author(s)
      Minami Nakmura, Go Kasuya, Koichi Nakajo
    • Organizer
      日本生理学会 第101回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A unique extracellular S4-S5 coupling in HCN channels regulates the voltage-dependent gating2024

    • Author(s)
      Jiaying Liu, Go Kasuya, Koichi Nakajo
    • Organizer
      日本生理学会 第101回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Ca2+ influx through slow muscle-type nichotinic AChR contributes to slow muscle contraction2024

    • Author(s)
      Buntaro Zempo, Fumihito Ono, Koichi Nakajo
    • Organizer
      日本生理学会 第101回大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] A role of the S1 segment in KCNQ1 modulation by KCNE2023

    • Author(s)
      Koichi Nakajo, Go Kasuya
    • Organizer
      Kv7 Channels Symposium
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Gating Modulation of KCNQ1 Channels by KCNE Subunits: A Structure-guided Approach2023

    • Author(s)
      Koichi Nakajo, Go Kasuya
    • Organizer
      The 9th International Ion Channel Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The distinct biophysical properties and physiological roles of two zebrafish HCN4 pacemaker channels2023

    • Author(s)
      Jiaying Liu, Go Kasuya, Buntaro Zempo & Koichi Nakajo
    • Organizer
      The 10th Federation of the Asian and Oceanian Physiological Societies Congress
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Functional impact of the interaction between S1 segment and KCNE subunit in the modulation of KCNQ1 channels2023

    • Author(s)
      Koichi Nakajo, Go Kasuya
    • Organizer
      Biophysical 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Gating modulation of voltage-gated K+ channels by auxiliary subunits via voltage-sensing domains2023

    • Author(s)
      Koichi Nakajo
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Physiological significance of the Ca2+ influx through slow muscle-type AChR on locomotor activity of zebrafish2023

    • Author(s)
      Buntaro Zempo, Fumihito Ono, Koichi Nakajo
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Proper interaction between the S1 segment of KCNQ1 and KCNE3 is required for the constitutively open nature of the KCNQ1-KCNE3 K+ channel complex2023

    • Author(s)
      Go Kasuya, Koichi Nakajo
    • Organizer
      第100回日本生理学会大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 構造情報を基盤とした電位依存性イオンチャネル複合体の研究方法2022

    • Author(s)
      中條浩一、糟谷豪
    • Organizer
      第95回日本生化学会大会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Gating modulation by macromolecular complex formation in voltage-gated K+ channels2022

    • Author(s)
      Koichi Nakajo
    • Organizer
      第95回日本薬理学会年会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] The proper distance between the S1 segment and KCNE3 is crucial for the constitutively open nature of the KCNQ1-KCNE3 K+ channel2022

    • Author(s)
      Go Kasuya, Koich Nakajo
    • Organizer
      第99回日本生理学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Pharmacological properties and physiological roles of two zebrafish HCN4 channels2022

    • Author(s)
      Jiaying Liu, Go Kasuya, Buntaro Zempo, Koichi Nakajo
    • Organizer
      第99回日本生理学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Slow muscle type nicotinic acetylcholine receptor in zebrafish shows high Ca 2+ permeability2022

    • Author(s)
      Buntaro Zempo, Fumihito Ono, Koichi Nakajo
    • Organizer
      第99回日本生理学会年会
    • Related Report
      2021 Research-status Report
  • [Remarks] 修飾タンパク質が膜電位・Ca2+活性化K+チャネルの電位とCa2+の依存性を同時に制御する機構の解明

    • URL

      https://www.jichi.ac.jp/news/research/2023113001/

    • Related Report
      2023 Annual Research Report
  • [Remarks] 上皮細胞でのK+リサイクルに関わるイオンチャネル複合体が生理条件下で常に開状態になる仕組みを解明

    • URL

      https://www.jichi.ac.jp/news/research/2022111402/

    • Related Report
      2022 Research-status Report
  • [Remarks] 上皮細胞でのカリウムイオンリサイクルに関わるイオンチャネル複合体が生理条件下で常に開状態になる仕組み

    • URL

      http://physiology.jp/science-topic/25887/

    • Related Report
      2022 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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