Structure of Photosystem I-LHCI-LHCII from the Green Alga Chlamydomonas Reinhardtii in State 2

Overview

Journal Nat Commun

Specialty Biology

Date 2021 Feb 18

PMID 33597543

Citations 32

Authors

Zihui Huang

Liangliang Shen

Wenda Wang

Zhiyuan Mao

Xiaohan Yi

Tingyun Kuang

Jian-Ren Shen

Xing Zhang

Guangye Han

Affiliations

Soon will be listed here.

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.

Citing Articles

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