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Regulatory dynamics of the higher-plant PSI-lHCI supercomplex during state transitions

Molecular Plant 2023年第12期16卷 1937-1950页

作者： Jianghao Wu Shuaijiabin Chen Chao Wang Weijun lin Chao Huang Chengxu Fan Dexian Han Dandan lu Xiumei Xu SenFang Sui lixin Zhang State Key laboratory of Crop Stress Adaptation and Improvement School of Life SciencesHenan UniversityJinming AvenueKaifeng 475004China School of life Science Southern University of Science and TechnologyShenzhen 518055China State Key laboratory of Membrane Biology Beijing Advanced Innovation Center for Structural BiologyBeijing Frontier Research Center for Biological StructureSchool of Life SciencesTsinghua UniversityBeijing 100084China Cryo-EM Center Southern University of Science and TechnologyShenzhen 518055China Photosynthesis Research Center Key Laboratory of PhotobiologyInsttute of BotanyChinese Academy of SciencesBejing 100093China

State transition is a fundamental light acclimation mechanism of photosynthetic organisms in response to the environmental light *** process rebalances the excitation energy between photosystemI(PSl)and photosystem Il through regulated reversible binding of the light-harvesting complex Il(lHCll)to ***,the structural reorganization of PSI-lHCI,the dynamic binding of lHCll,and the regulatory mechanisms underlying state transitions are less understood in higher *** this study,using cryoelectron microscopy we resolved the structures of PSI-lHCI in both state 1(PSI-lHCI-ST1)and state 2(PSIlHCI-lHCll-ST2)from Arabidopsis *** genetic and functional analyses revealed novel contacts between lhcb1 and PsaK that further enhanced the binding of the lHCll trimer to the PSI core with the known interactions between phosphorylated lhcb2 and the Psal/PsaH/PsaO ***,PsaO was absent in the PSI-lHCI-ST1 supercomplex but present in the PSI-lHCI-lHCIl-ST2 supercomplex,in which the Psal/PsaK/PsaA subunits undergo several conformational changes to strengthen the binding of PsaO in ***,the PSI-lHCI module adopts a more compact configuration with shorter Mg-to-Mg distances between the chlorophylls,which may enhance the energy transfer efficiency from the peripheral antenna to the PSl core in ***,our work provides novel structural and functional insights into the mechanisms of light acclimation during state transitions in higher plants.

关键词： state transitions dynamic conformation photosystem l regulatory mechanism Arabidopsis thaliana

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