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Verification of mutual regulation hypothesis for electron flow and light harvesting system in photosynthesis

Research Project

Project/Area Number 21K06217
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionOkayama University

Principal Investigator

Ozawa Shin-Ichiro  岡山大学, 資源植物科学研究所, 特任助教 (80717538)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
KeywordsPhotosynthesis / Plant physiology / biochemistry / Photosynthetic control / cytochrome b6f / シトクロムb6f複合体 / LHCI / 光化学系I複合体 / 葉緑体ATP合成酵素 / 光合成 / 光エネルギー利用
Outline of Research at the Start

光合成反応が光を利用してエネルギーを供給するため、植物は適切な光のもとでより良く成長する。ところが光の強度は短時間に変化するため利用する光エネルギー量制御と電子伝達反応制御の二段構えの制御機構が効率的な光合成の鍵となる。これまで、それぞれの機構は詳細に研究されてきたが、両者の相互影響は不明な点が多い。そこで本研究では、常に電子伝達経路に含まれる光化学系である光化学系I複合体(PSI)に着目し、特にその光エネルギー量制御を担うLHCIの高次構造に着目し、電子伝達制御を変化させることとLHCIの構造を改変することで、光合成における二段構えの制御機構の相互影響を検証する。

Outline of Final Research Achievements

The photosynthetic electron transfer system is protected by NPQ, cyclic electron transfer, and photosynthetic control (PCON), while the light-harvesting antenna complex (LHC) optimizes light energy. This study generated and characterized the PCON mutant. The data showed that PCON is driven by acidification of the thylakoid lumen and is important for photosynthetic growth under high light. In addition, mass spectrometry-based interactome analysis proposed a structural role for outer LHCI under high light where NPQ is inducible, supported by biochemical experiments using an outer LHCI subunit-deficient mutant.

Academic Significance and Societal Importance of the Research Achievements

Photosynthetic controlはチラコイド膜ルーメンの酸性化に応答したb6fの電子伝達速度調整であり光合成的細胞成長にも影響が大きいことを見いだした。この機能を発揮するb6fの構造的な基盤が明らかになればさらなる機能解明が期待される。また、強光下でLHCがはたす構造的な役割も一端が見え始めてきた。解析対象を広げることで、LHCの機能をより動的に捉えることができると期待される。

Report

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

    (19 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results,  Open Access: 6 results) Presentation (9 results) Remarks (2 results)

  • [Int'l Joint Research] ミュンスター大学(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ミュンスター大学(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Dysfunction of Chloroplast Protease Activity Mitigates pgr5 Phenotype in the Green Algae Chlamydomonas reinhardtii2024

    • Author(s)
      Ozawa Shin-Ichiro、Zhang Guoxian、Sakamoto Wataru
    • Journal Title

      Plants

      Volume: 13 Issue: 5 Pages: 606-606

    • DOI

      10.3390/plants13050606

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chloroplast ATP synthase biogenesis requires peripheral stalk subunits AtpF and ATPG and stabilization of <i>atpE</i> mRNA by OPR protein MDE12023

    • Author(s)
      Chaux Frederic、Jarrige Domitille、Rodrigues‐Azevedo Marcio、Bujaldon Sandrine、Caspari Oliver D.、Ozawa Shin‐Ichiro、Drapier Dominique、Vallon Olivier、Choquet Yves、de Vitry Catherine
    • Journal Title

      The Plant Journal

      Volume: 116 Issue: 6 Pages: 1582-1599

    • DOI

      10.1111/tpj.16448

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of tryptophan oxidation affecting D1 degradation by FtsH in the photosystem II quality control of chloroplasts2023

    • Author(s)
      Kato Yusuke、Kuroda Hiroshi、Ozawa Shin-Ichiro、Saito Keisuke、Dogra Vivek、Scholz Martin、Zhang Guoxian、de Vitry Catherine、Ishikita Hiroshi、Kim Chanhong、Hippler Michael、Takahashi Yuichiro、Sakamoto Wataru
    • Journal Title

      eLife

      Volume: 12

    • DOI

      10.7554/elife.88822

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Algal PETC-Pro171-Leu suppresses electron transfer in cytochrome<i>b</i>6<i>f</i>under acidic lumenal conditions2023

    • Author(s)
      Ozawa Shin-Ichiro、Buchert Felix、Reuys Ruby、Hippler Michael、Takahashi Yuichiro
    • Journal Title

      Plant Physiology

      Volume: 191 Issue: 3 Pages: 1803-1817

    • DOI

      10.1093/plphys/kiac575

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Two specific domains of the γ subunit of chloroplast F <sub>o</sub> F <sub>1</sub> provide redox regulation of the ATP synthesis through conformational changes2023

    • Author(s)
      Akiyama Kentaro、Ozawa Shin-Ichiro、Takahashi Yuichiro、Yoshida Keisuke、Suzuki Toshiharu、Kondo Kumiko、Wakabayashi Ken-ichi、Hisabori Toru
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 120 Issue: 6

    • DOI

      10.1073/pnas.2218187120

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The algal PETC-Pro171-Leu suppresses electron transfer in the cytochrome b6f under acidic lumenal condition2021

    • Author(s)
      Ozawa Shin-Ichiro、Buchert Felix、Reuys Ruby、Hippler Michael、Takahashi Yuichiro
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2021.12.15.472847

    • Related Report
      2021 Research-status Report
    • Open Access / Int'l Joint Research
  • [Presentation] 集光アンテナ複合体の多様性から考えるモデル生物の立ち位置2024

    • Author(s)
      小澤真一郎
    • Organizer
      第65回日本植物生理学会年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The mutant analysis of amino acid substitution at PETC subunit in the cytochrome b6f complex in the green alga Chlamydomonas reinhardtii2023

    • Author(s)
      Shin-Ichiro Ozawa, Felix Buchert, Ruby Reuys, Yuval Milrad, Frauke Baymann, Michael Hippler, and Yuichiro Takahashi
    • Organizer
      第13回日本光合成学会年会およびシンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] 緑藻クラミドモナスにおける、光捕集タンパク質複合体構成サブユニット欠損株の解析2023

    • Author(s)
      小澤真一郎
    • Organizer
      第17回クラミドモナス研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] ゲラニルゲラニルクロロフィルをもつクロロフィルタンパク複合体の解析2023

    • Author(s)
      Sireesha Kodru, Sreedhar Nellaepalli, 小澤真一郎, 佐藤千紘, 黒田洋詩, 田中亮一, Krishna K Niyogi, 高橋裕一郎
    • Organizer
      第13回日本光合成学会年会およびシンポジウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] LIL3/GGRを欠損した変異株のクロロフィルタンパク質の機能解析2023

    • Author(s)
      Kodru Sireesha, Nellaepalli Sreedhar, 小澤真一郎, 佐藤千紘, 黒田洋詩, 田中亮一, Niyogi Krishuna, 高橋裕一郎
    • Organizer
      第87回日本植物学会年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The amino acid substitution, PETC-Pro171Leu, slowdown electron transfer in the cytochrome b6f complex under anoxic conditions in the green alga Chlamydomonas reinhardtii2023

    • Author(s)
      Shin-Ichiro Ozawa, Felix Buchert, Ruby Reuys, Michael Hippler, and Yuichiro Takahashi
    • Organizer
      第64回日本植物生理学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 緑藻クラミドモナスのシトクロムb6f のPETC-Pro171-Leu変異株解析2022

    • Author(s)
      小澤真一郎,Felix Buchert,Ruby Reuys,Michael Hippler,高橋裕一郎
    • Organizer
      第12回日本光合成学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] LHCA3またはLHCA7欠損株におけるPSI-LHCIの生化学的解析2022

    • Author(s)
      小澤 真一郎,髙木 理世,高橋 裕一郎
    • Organizer
      第15回クラミドモナス研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] 緑藻クラミドモナスのシトクロムb6f のPETC-171-Pro をLeu に置換した変異株はルーメン酸性下条件で電子伝達速度を強く抑制する2022

    • Author(s)
      小澤真一郎,ブッハート フェリックス,ルイス ルビー,ヒップラー ミヒャエル,高橋裕一郎
    • Organizer
      第63回日本植物生理学会年会
    • Related Report
      2021 Research-status Report
  • [Remarks] RECTOR Program

    • URL

      http://www.rib.okayama-u.ac.jp/RECTOR/

    • Related Report
      2022 Research-status Report
  • [Remarks] 文献リスト

    • URL

      https://www.rib.okayama-u.ac.jp/RECTOR/index.php/publications/

    • Related Report
      2021 Research-status Report

URL: 

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

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