Structure of photosystem I-LHCI-LHCII from the green alga Chlamydomonas reinhardtii in State 2

Zihui Huang, Liangliang Shen, Wenda Wang, Zhiyuan Mao, Xiaohan Yi, Tingyun Kuang, Jian-Ren Shen (), Xing Zhang () and Guangye Han ()
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Zihui Huang: Zhejiang University School of Medicine
Liangliang Shen: Institute of Botany, Chinese Academy of Sciences
Wenda Wang: Institute of Botany, Chinese Academy of Sciences
Zhiyuan Mao: Institute of Botany, Chinese Academy of Sciences
Xiaohan Yi: Zhejiang University School of Medicine
Tingyun Kuang: Institute of Botany, Chinese Academy of Sciences
Jian-Ren Shen: Institute of Botany, Chinese Academy of Sciences
Xing Zhang: Zhejiang University School of Medicine
Guangye Han: Institute of Botany, Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract Photosystem I (PSI) and II (PSII) balance their light energy distribution absorbed by their light-harvesting complexes (LHCs) through state transition to maintain the maximum photosynthetic performance and to avoid photodamage. In state 2, a part of LHCII moves to PSI, forming a PSI-LHCI-LHCII supercomplex. The green alga Chlamydomonas reinhardtii exhibits state transition to a far larger extent than higher plants. Here we report the cryo-electron microscopy structure of a PSI-LHCI-LHCII supercomplex in state 2 from C. reinhardtii at 3.42 Å resolution. The result reveals that the PSI-LHCI-LHCII of C. reinhardtii binds two LHCII trimers in addition to ten LHCI subunits. The PSI core subunits PsaO and PsaH, which were missed or not well-resolved in previous Cr-PSI-LHCI structures, are observed. The present results reveal the organization and assembly of PSI core subunits, LHCI and LHCII, pigment arrangement, and possible pathways of energy transfer from peripheral antennae to the PSI core.

Date: 2021
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DOI: 10.1038/s41467-021-21362-6

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