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2023 Fiscal Year Final Research Report

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

Research Project

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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
Keywords光合成 / 光化学系II / 光阻害 / 修復
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.

Free Research Field

植物生理

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。

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Published: 2025-01-30  

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