Structural basis for energy transfer in a huge diatom PSI-FCPI supercomplex

Caizhe Xu, Xiong Pi, Yawen Huang, Guangye Han, Xiaobo Chen, Xiaochun Qin, Guoqiang Huang, Songhao Zhao, Yanyan Yang, Tingyun Kuang, Wenda Wang (), Sen-Fang Sui () and Jian-Ren Shen ()
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Caizhe Xu: The Chinese Academy of Sciences
Xiong Pi: Tsinghua University
Yawen Huang: Tsinghua University
Guangye Han: The Chinese Academy of Sciences
Xiaobo Chen: The Chinese Academy of Sciences
Xiaochun Qin: University of Jinan
Guoqiang Huang: Tsinghua University
Songhao Zhao: The Chinese Academy of Sciences
Yanyan Yang: The Chinese Academy of Sciences
Tingyun Kuang: The Chinese Academy of Sciences
Wenda Wang: The Chinese Academy of Sciences
Sen-Fang Sui: Tsinghua University
Jian-Ren Shen: The Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Diatom is an important group of marine algae and contributes to around 20% of the global photosynthetic carbon fixation. Photosystem I (PSI) of diatoms is associated with a large number of fucoxanthin-chlorophyll a/c proteins (FCPIs). We report the structure of PSI-FCPI from a diatom Chaetoceros gracilis at 2.38 Å resolution by single-particle cryo-electron microscopy. PSI-FCPI is a monomeric supercomplex consisting of 12 core and 24 antenna subunits (FCPIs), and 326 chlorophylls a, 34 chlorophylls c, 102 fucoxanthins, 35 diadinoxanthins, 18 β-carotenes and some electron transfer cofactors. Two subunits designated PsaR and PsaS were found in the core, whereas several subunits were lost. The large number of pigments constitute a unique and huge network ensuring efficient energy harvesting, transfer and dissipation. These results provide a firm structural basis for unraveling the mechanisms of light-energy harvesting, transfer and quenching in the diatom PSI-FCPI, and also important clues to evolutionary changes of PSI-LHCI.

Date: 2020
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DOI: 10.1038/s41467-020-18867-x

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