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Elucidation of the molecular mechanisms of rapid turnover of photodamaged photosystem II

Research Project

Project/Area Number 22K14795
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 37030:Chemical biology-related
Research InstitutionThe University of Tokyo

Principal Investigator

Haruhiko Jimbo  東京大学, 大学院総合文化研究科, 助教 (50835965)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords光合成 / 光化学系II / 光阻害 / 修復 / ケミカルバイオロジー / シアノバクテリア / 脂質 / メタボロン / 代謝工学
Outline of Research at the Start

本研究では、光合成生物において、強光によって失活した光合成が、高速で修復される分子メカニズムを酵素タンパク質の複合体形成(メタボロン)という観点から解き明かす。損傷した光合成の修復過程では、タンパク質や色素・脂質分子などの解体と再合成・再構築がかなりの速度で起こる。本研究では、ケミカルバイオロジーとプロテオームを駆使して、光合成の修復に関わる膜上メタボロンの形成および構成因子の全容解明に取り組む。

Outline of Final Research Achievements

Light is necessary for driving photosynthesis, however the excess light energy damages photosystem II (PSII), which results in low activity of photosynthesis. Photosynthetic organisms maintain photosynthetic activity by rapidly repairing damaged PSII. In this study, with the aim of elucidating the molecular basis of the PSII repair process in thylakoid membranes, we searched for lipase genes that degrade membrane lipids and analyzed their functions, and identified three lipases from the cyanobacterial genome. Each of them was analyzed as a galactolipase, phospholipase or acylplastoquinone lipase, and their functions in functional analysis and photosynthesis were clarified. The results of this study demonstrate the importance of the metabolic turnover of membrane lipids in the molecular basis of fast PSII repair.

Academic Significance and Societal Importance of the Research Achievements

PSII修復機構の研究は50年以上続いており、これまでに多くの遺伝子とその機能が明らかとなっている。しかし、膜脂質との関わりについては、不明な点が多い。本研究において、膜脂質の代謝回転によるPSII修復を明らかにしたことで、これまでのPSII修復機構の研究に新たなプレイヤーを追加することができた点は、学術的意義が高い。また、本研究の成果は、同じ光合成生物である植物や藻類にも応用することが可能であり、今後、植物や藻類をベースとした物質生産技術や農作物生産技術の開発においても社会的意義は大きいと思われる。

Report

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

    (11 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] High Myristic Acid in Glycerolipids Enhances the Repair of Photodamaged Photosystem II under Strong Light2024

    • Author(s)
      Kurima Kazuki、Jimbo Haruhiko、Fujihara Takashi、Saito Masakazu、Ishikawa Toshiki、Wada Hajime
    • Journal Title

      Plant And Cell Physiology

      Volume: 0 Issue: 5 Pages: 1-8

    • DOI

      10.1093/pcp/pcae021

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Biosynthesis of phosphatidylglycerol in photosynthetic organisms2024

    • Author(s)
      Kobayashi Koichi、Jimbo Haruhiko、Nakamura Yuki、Wada Hajime
    • Journal Title

      Progress in Lipid Research

      Volume: 93 Pages: 101266-101266

    • DOI

      10.1016/j.plipres.2023.101266

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deacylation of galactolipids decomposes photosystem II dimers to enhance degradation of damaged D12023

    • Author(s)
      Haruhiko Jimbo and Hajime Wada
    • Journal Title

      Plant Physiology

      Volume: 191 Issue: 1 Pages: 87-95

    • DOI

      10.1093/plphys/kiac460

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crucial importance of length of fatty-acyl chains bound to the sn-2 position of phosphatidylglycerol for growth and photosynthesis of Synechocystis sp. PCC 68032022

    • Author(s)
      Kaichiro Endoa, Masato Abe, Nobumasa Kawanishi, Haruhiko Jimbo, Koichi Kobayashi, Tomoko Suzuki, Noriko Nagata, Hideto Miyoshi, Hajime Wada
    • Journal Title

      BBA - Molecular and Cell Biology of Lipids

      Volume: 1867 Issue: 7 Pages: 159158-159164

    • DOI

      10.1016/j.bbalip.2022.159158

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] シアノバクテリアの光合成におけるリパーゼの役割2023

    • Author(s)
      神保晴彦、和田 元
    • Organizer
      ラン藻の分子生物学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Lipid turnover accelerates the disassembly of PSII complexes and the D1degradation during the PSII repair2023

    • Author(s)
      Haruhiko Jimbo, Masato Abe, Hideto Miyoshi and Hajime Wada
    • Organizer
      International Congress on Photosynthesis Research 2022
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 光化学系IIの修復におけるリパーゼの役割2023

    • Author(s)
      神保晴彦、和田 元
    • Organizer
      光合成学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Turnover of lipids in PSII repair under strong light2023

    • Author(s)
      Haruhiko Jimbo and Hajime Wada
    • Organizer
      Asia-Oceania Symposium in Plant lipids
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 光化学系II複合体の修復におけるガラクトリパーゼの役割2023

    • Author(s)
      神保晴彦、和田元
    • Organizer
      第64回日本植物生理学会
    • Related Report
      2022 Research-status Report
  • [Presentation] 光化学系IIの修復におけるリパーゼの役割2022

    • Author(s)
      神保晴彦、和田元
    • Organizer
      第24回光合成学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] シアノバクテリアの光合成におけるリパーゼの役割2022

    • Author(s)
      神保晴彦、和田元
    • Organizer
      日本植物脂質研究会
    • Related Report
      2022 Research-status Report

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Published: 2022-04-19   Modified: 2025-01-30  

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