• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Molecular mechanism of voltage-gated Na+ channel inhibition by ciguatoxin analogs (CTXs)

Research Project

Project/Area Number 20K06246
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 40040:Aquatic life science-related
Research InstitutionFisheries Research and Education Agency

Principal Investigator

Ikehara Tsuyoshi  国立研究開発法人水産研究・教育機構, 水産大学校, 教授 (90359951)

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: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsシガトキシン / 電位依存性Na+チャネル / 電位依存性Na⁺チャネル / リコンビナントタンパク / 海洋自然毒 / ブレべトキシン / ナトリウムチャネル / 阻害機構
Outline of Research at the Start

シガトキシン(CTX)やブレベトキシン(BTX)等多くの海洋自然毒は、電位依存性Na+チャネル(Navch)の特定の部位に結合することでチャネル機能が阻害されると推定されてきた。しかし、BTXB2、B3、B4やCTX類の構造と生物活性はこの仮説に合致せず、CTXやBTXの結合様式の詳細は明らかにされていない。そこで、本研究ではリコンビナントNavchと蛍光標識したBTXを用いたin vitro Navch競合結合試験系を構築し、構造の異なる各種CTX同族体によるNavchへの結合を測定することによってNavchを標的とする海洋自然毒の結合特性や結合部位を解明するための研究基盤を構築する。

Outline of Final Research Achievements

Many natural marine toxins, such as ciguatoxins (CTXs) and brevetoxins (BTXs), have been presumed to inhibit channel function by binding to specific sites of voltage-gated Na+ channels (Navch). However, the structure and biological activity of BTXs and CTXs are not consistent with this hypothesis, and the details of their binding modes have not been clarified. In this study, we prepared recombinant Navch and fluorescently labeled BTX, and tried to construct an in vitro Navch competitive binding test system using them. As a result, about 4.5 μg of fluorescence-labeled BTX was synthesized, and marine bacterial rNavch was produced using an E. coli expression system. By measuring the binding to Navch using these, it will be possible to elucidate the binding properties and binding sites of marine natural poisons that target Navch.

Academic Significance and Societal Importance of the Research Achievements

本研究の目的は、Navchと蛍光標識BTXとの安定したin vitro Navch競合結合試験系を構築し、Navchに対するCTXの結合特性や結合部位を解明することである。本研究では、ヒトNavchに比べて安定性が高い海洋細菌のリコンビナントNavch(rNavchRp)を作製し、蛍光標識BTXの調製を行い、in vitro Navch競合結合試験系構築のための検討に必要な条件を整えた。リコンビナントNavchを利用し、海洋毒との結合解析に使用可能な安定した実験系を確立することは技術的なチャレンジであり、確立されれば他の海洋毒にも応用可能な試験系となりうる点に本研究の実用的・技術的意義がある。

Report

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

    (4 results)

All 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results)

  • [Journal Article] Analytical Studies on Ciguateric Fish in Okinawa, Japan (II): The Grouper Variola albimarginata2023

    • Author(s)
      Oshiro Naomasa、Nagasawa Hiroya、Nishimura Mio、Kuniyoshi Kyoko、Kobayashi Naoki、Sugita-Konishi Yoshiko、Ikehara Tsuyoshi、Tachihara Katsunori、Yasumoto Takeshi
    • Journal Title

      Journal of Marine Science and Engineering

      Volume: 11 Issue: 2 Pages: 242-242

    • DOI

      10.3390/jmse11020242

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Analysis of Ciguatoxins in the Spotted Knifejaw, <i>Oplegnathus punctatus</i> from the Waters of Japan2022

    • Author(s)
      Tomikawa Takumi、Kuniyoshi Kyoko、Ito Shiori、Sakugawa Satsuki、Ishikawa Akira、Saito Toshio、Kojima Takashi、Asakura Hiroshi、Ikehara Tsuyoshi、Oshiro Naomasa
    • Journal Title

      Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi)

      Volume: 63 Issue: 5 Pages: 190-194

    • DOI

      10.3358/shokueishi.63.190

    • ISSN
      0015-6426, 1882-1006
    • Year and Date
      2022-10-25
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Specification of the Okadaic Acid Equivalent for Okadaic Acid, Dinophysistoxin-1, and Dinophysistoxin-2 Based on Protein Phosphatase 2A Inhibition and Cytotoxicity Assays Using Neuro 2A Cell Line2021

    • Author(s)
      Ikehara Tsuyoshi、Chikanishi Kazuya、Oshiro Naomasa
    • Journal Title

      Journal of Marine Science and Engineering

      Volume: 9 Issue: 10 Pages: 1140-1140

    • DOI

      10.3390/jmse9101140

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Long noncoding RNAs transcribed downstream of the human β-globin locus regulate β-globin gene expression2021

    • Author(s)
      Higashi Miki、Ikehara Tsuyoshi、Nakagawa Takeya、Yoneda Mitsuhiro、Hattori Naoko、Ikeda Masaaki、Ito Takashi
    • Journal Title

      The Journal of Biochemistry

      Volume: 171 Issue: 3 Pages: 287-294

    • DOI

      10.1093/jb/mvab130

    • Related Report
      2021 Research-status Report
    • Peer Reviewed

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi