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Development of a novel chemical modification method to enable electron microscopic observation of voltage-dependent calcium channels

Research Project

Project/Area Number 18K14334
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 37010:Bio-related chemistry
Research InstitutionKyoto University

Principal Investigator

Tamura Tomonori  京都大学, 工学研究科, 講師 (10746639)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsカルシウムチャネル / 神経 / 可視化 / P/Q型Ca2+チャネル / タンパク質化学修飾 / 電子顕微鏡 / P/Q型カルシウムチャネル / 蛍光イメージング / ケミカルバイオロジー
Outline of Final Research Achievements

In this study, we sought to develope a chemical probe based on agatoxin toxin to chemically modify endogenous Ca2+ channels in brain tissue and visualize them at nanometer resolution. Specifically, we targeted P/Q-type Ca2+ channels that is abundant in cerebellar Purkinje cells, and synthesized agatoxin derivatives linked to fluorescent dyes or oxime catalysts. Indeed, imaging analysis confirmed the binding of fluorescein-agatoxin conjugates to P/Q-type Ca2+ channels in mouse brain slices.

Academic Significance and Societal Importance of the Research Achievements

電位依存性カルシウム(Ca2+)チャネルとシナプス小胞間の距離は神経伝達物質放出を制御する主要因子であると考えられている。しかしその重要性にも関わらず、従来の電子顕微鏡技術では両者を同時に観察できないため、実際のCa2+チャネル-シナプス小胞間距離やその空間分布は不明であった。そこで本研究では脳組織中のCa2+チャネルを化学修飾し、ナノメートル分解能で可視化可能な新手法を開発する。本手法によってCa2+チャネル-シナプス小胞間の距離が決定できれば、記憶・学習に関わる神経伝達機構の分子論的理解がより深まり、神経疾患の病態解明や治療法開発に貢献すると期待できる。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2020 2019 2018

All Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Development of a cell-based ligand-screening system for identifying Hsp90 inhibitors2020

    • Author(s)
      Tsuyoshi Ueda, Tomonori Tamura, Itaru Hamachi
    • Journal Title

      Biochemistry

      Volume: 59 Issue: 2 Pages: 179-182

    • DOI

      10.1021/acs.biochem.9b00781

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development of a Photoactivatable Proximity Labeling Method for the Identification of Nuclear Proteins2020

    • Author(s)
      Tomonori Tamura, Mikiko Takato, Keiya Shiono, Itaru Hamachi
    • Journal Title

      Chemistry Letters

      Volume: 49 Issue: 2 Pages: 145-148

    • DOI

      10.1246/cl.190804

    • NAID

      130007795177

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Chemical proteomics for subcellular proteome analysis2019

    • Author(s)
      Zhu Hao、Tamura Tomonori、Hamachi Itaru
    • Journal Title

      Current Opinion in Chemical Biology

      Volume: 48 Pages: 1-7

    • DOI

      10.1016/j.cbpa.2018.08.001

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Development of a Nitric Oxide-Responsive Labeling Reagent for Proteome Analysis of Live Cells2019

    • Author(s)
      Nishikawa Yuki、Miki Takayuki、Awa Masashi、Kuwata Keiko、Tamura Tomonori、Hamachi Itaru
    • Journal Title

      ACS Chemical Biology

      Volume: 14 Issue: 3 Pages: 397-404

    • DOI

      10.1021/acschembio.8b01021

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Chemistry for Covalent Modification of Endogenous/Native Proteins: From Test Tubes to Complex Biological Systems2018

    • Author(s)
      Tamura Tomonori、Hamachi Itaru
    • Journal Title

      Journal of the American Chemical Society

      Volume: 141 Issue: 7 Pages: 2782-2799

    • DOI

      10.1021/jacs.8b11747

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] ペプチド毒素アガトキシンを用いたCa2+チャネルのlive brainラベリング2020

    • Author(s)
      美野 丈晴、後藤 大輝、田村 朋則、坂本 清志、浜地 格
    • Organizer
      日本化学会 第100春季年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 生物毒素由来アガトキシンを用いた電位依存性Ca2+チャネルの可視化2019

    • Author(s)
      美野 丈晴、後藤 大輝、田村 朋則、坂本 清志、浜地 格
    • Organizer
      第13回バイオ関連化学シンポジウム
    • Related Report
      2019 Annual Research Report
  • [Presentation] 細胞および脳組織における内在性タンパク質の固定化駆動型アフィニティーラベリング2019

    • Author(s)
      天池一真、山上禎俊、西川雄貴、後藤大輝、清中茂樹、浜地格
    • Organizer
      日本化学会第99春季年会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2021-02-19  

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