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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Vydané v:	Nature communications Ročník 12; číslo 1; s. 1100 - 14
Hlavní autori:	Huang, Zihui, Shen, Liangliang, Wang, Wenda, Mao, Zhiyuan, Yi, Xiaohan, Kuang, Tingyun, Shen, Jian-Ren, Zhang, Xing, Han, Guangye
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 17.02.2021 Nature Publishing Group Nature Portfolio
Predmet:	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
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Shrnutí:	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.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	2041-1723 2041-1723
DOI:	10.1038/s41467-021-21362-6