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

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 super...

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Published in:Nature communications Vol. 12; no. 1; pp. 1100 - 14
Main Authors: Huang, Zihui, Shen, Liangliang, Wang, Wenda, Mao, Zhiyuan, Yi, Xiaohan, Kuang, Tingyun, Shen, Jian-Ren, Zhang, Xing, Han, Guangye
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 17.02.2021
Nature Publishing Group
Nature Portfolio
Subjects:
101/28
631/449/1734/2075
631/535/1258/1259
82/16
82/29
82/83
Algae
Algal Proteins - chemistry
Algal Proteins - metabolism
Algal Proteins - ultrastructure
Antennae
Aquatic plants
Chlamydomonas reinhardtii
Chlamydomonas reinhardtii - metabolism
Chlorophyll
Chlorophyll - metabolism
Cryoelectron Microscopy
Electron microscopy
Energy distribution
Energy Transfer
Humanities and Social Sciences
Light-Harvesting Protein Complexes - chemistry
Light-Harvesting Protein Complexes - metabolism
Light-Harvesting Protein Complexes - ultrastructure
Microscopy
Models, Molecular
multidisciplinary
Photosynthesis
Photosystem I
Photosystem I Protein Complex - chemistry
Photosystem I Protein Complex - metabolism
Photosystem I Protein Complex - ultrastructure
Photosystem II
Photosystem II Protein Complex - chemistry
Photosystem II Protein Complex - metabolism
Photosystem II Protein Complex - ultrastructure
Protein Binding
Protein Conformation
Protein Multimerization
Science
Science (multidisciplinary)
Thylakoids - metabolism
Thylakoids - ultrastructure
Transmission electron microscopy
Trimers
ISSN:2041-1723, 2041-1723
Online Access:Get full text
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Summary: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. Photosystems (PS) I and II undergo state transitions to optimize photosynthesis and photoprotection. Here the authors report a cryo-electron microscopy structure of the state 2 PSI-LHCI-LHCII supercomplex from C. reinhardtii revealing subunit organization and possible pathways of energy transfer.
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ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-21362-6