青い光の光受容体 が 光合成 の フィードバック 調節 を 媒介 する
Dimitris Petroutsos1, Ryutaro Tokutsu2,3,4, Shinichiro Maruyama5
1Laboratoire de Physiologie Cellulaire et Végétale, UMR 5168, Centre National de la Recherche Scientifique, Commissariat à l'Energie Atomique et aux Energies Alternatives, Université Grenoble Alpes, Institut National Recherche Agronomique, Institut de Biosciences et Biotechnologies de Grenoble, (BIG), CEA Grenoble, F-38054 Grenoble CEDEX 9, France.
Nature
|September 15, 2016
まとめ
フォトトロピン (PHOT) は,藻類の光感知と光保護を結びつける. PHOTはLHCSR3タンパク質の発現を誘導することで高エネルギー quenching (qE) を制御し,これは高光下での生存に不可欠です.
科学分野:
- 植物と藻類の生物学
- 光生物学
- 分子植物生理学
背景:
- 光合成には光が不可欠ですが,高強度では酸化による損傷を引き起こす可能性があります.
- 高エネルギー quenching (qE) のような光保護メカニズムは細胞損傷を防ぐ.
- フォトトロピン (PHOT) のような光受容体は,光反応を媒介する.
研究 の 目的:
- クラミドモナス・ラインハーディの光受容,光合成,光保護の間の分子関係を調査する.
- 高光下での光保護反応の調節におけるPHOTの役割を解明する.
主な方法:
- PHOT欠乏変異体の遺伝子解析
- LHCSR3の遺伝子発現分析
- 光保護メカニズムの評価のための生化学的測定.
主要な成果:
- PHOTは高エネルギー消火 (qE) を制御することが判明した.
- PHOTは,qEエフェクタータンパク質LHCSR3の発現を誘導する.
- PHOTが欠けていた変異体は 過剰な光線下での体調低下と 光保護機能の低下を示した.
結論:
- PHOT媒介による光知覚と光保護反応qEとの間には分子関連がある.
- PHOTは,光の利用と分散を調節することにより,変動する光環境への適応に不可欠です.
- PHOTキナーゼによるLHCSR3誘導は,光システムIIにおける光保護に不可欠である.
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