Structural insights into photosystem II supercomplex and trimeric FCP antennae of a centric diatom Cyclotella meneghiniana

Songhao Zhao, Lili Shen, Xiaoyi Li, Qiushuang Tao, Zhenhua Li, Caizhe Xu, Cuicui Zhou, Yanyan Yang, Min Sang, Guangye Han, Long-Jiang Yu, Tingyun Kuang, Jian-Ren Shen () and Wenda Wang ()
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Songhao Zhao: Chinese Academy of Sciences
Lili Shen: Chinese Academy of Sciences
Xiaoyi Li: Chinese Academy of Sciences
Qiushuang Tao: Chinese Academy of Sciences
Zhenhua Li: Chinese Academy of Sciences
Caizhe Xu: Chinese Academy of Sciences
Cuicui Zhou: Chinese Academy of Sciences
Yanyan Yang: Chinese Academy of Sciences
Min Sang: China National Botanical Garden
Guangye Han: Chinese Academy of Sciences
Long-Jiang Yu: Chinese Academy of Sciences
Tingyun Kuang: Chinese Academy of Sciences
Jian-Ren Shen: Chinese Academy of Sciences
Wenda Wang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract Diatoms are dominant marine algae and contribute around a quarter of global primary productivity, the success of which is largely attributed to their photosynthetic capacity aided by specific fucoxanthin chlorophyll-binding proteins (FCPs) to enhance the blue-green light absorption under water. We purified a photosystem II (PSII)-FCPII supercomplex and a trimeric FCP from Cyclotella meneghiniana (Cm) and solved their structures by cryo-electron microscopy (cryo-EM). The structures reveal detailed organizations of monomeric, dimeric and trimeric FCP antennae, as well as distinct assemblies of Lhcx6_1 and dimeric FCPII-H in PSII core. Each Cm-PSII-FCPII monomer contains an Lhcx6_1, an FCP heterodimer and other three FCP monomers, which form an efficient pigment network for harvesting energy. More diadinoxanthins and diatoxanthins are found in FCPs, which may function to quench excess energy. The trimeric FCP contains more chlorophylls c and fucoxanthins. These diversified FCPs and PSII-FCPII provide a structural basis for efficient light energy harvesting, transfer, and dissipation in C. meneghiniana.

Date: 2023
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DOI: 10.1038/s41467-023-44055-8

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