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Dynamical and allosteric regulation of photoprotection in light harvesting complex Ⅱ

Science China Chemistry 2020年第8期63卷 1121-1133页

作者： Hao Li Yingjie Wang Manping Ye Shanshan Li Deyong Li Haisheng Ren Mohan Wang Luchao Du Heng Li Gianluigi Veglia Jiali Gao Yuxiang Weng Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Shenzhen Bay Laboratory Shenzhen 518055China Department of Chemistry and Supercomputing Institute University of MinnesotaMinneapolisMN 55455USA Department of Biochemistry Molecular Biology and BiophysicsUniversity of MinnesotaMinneapolisMN 55455USA Laboratory of Computational Chemistry and Drug Design State Key Laboratory of Chemical OncogenomicsPeking University Shenzhen Graduate SchoolShenzhen 518055China

Major light-harvesting complex of photosystemⅡ(LHCⅡ)plays a dual role in light-harvesting and excited energy dissipation to protect photodamage from excess *** regulatory switch is induced by increased acidity,temperature or ***,the molecular origin of the protein dynamics at the atomic level is still *** carried out temperature-jump time-resolved infrared spectroscopy and molecular dynamics simulations to determine the energy quenching dynamics and conformational changes of LHCⅡ*** found that the spontaneous formation of a pair of localα-helices from the 310-helix E/loop and the C-terminal coil of the neighboring monomer,in response to the increased environmental temperature and/or acidity,induces a scissoring motion of transmembrane helices A and B,shifting the conformational equilibrium to a more open state,with an increased angle between the associated *** dynamical and allosteric conformation change leads to close contacts between carotenoid lutein 1 and chlorophyll pigment 612,facilitating the fluorescence *** on these results,we suggest a unified mechanism by which the LHCⅡtrimer controls the dissipation of excess excited energy in response to increased temperature and acidity,as an intrinsic result of intense sun light in plant photosynthesis.

关键词： LHCⅡphotoprotection conformational dynamics and allostery protein switch T-jump FTIR fluorescence quenching excited energy transfer

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