Architecture and function of plant light-harvesting complexes II

•Plant LHCIIs have similar apoproteins but differ in oligomeric states and pigment contents.•The densely packed chlorophyll molecules of LHCII form sophisticated energy transfer pathways.•The structural bases for the mechanism of non-photochemical quenching are summarized. The antenna system associa...

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Bibliographic Details
Published in:Current opinion in structural biology 2013-08, Vol.23 (4), p.515-525
Main Authors: Pan, Xiaowei, Liu, Zhenfeng, Li, Mei, Chang, Wenrui
Format: Article
Language:English
Subjects:
Binding Sites
Chlorophyll - metabolism
Light
Light-Harvesting Protein Complexes - metabolism
Light-Harvesting Protein Complexes - ultrastructure
Models, Molecular
Photosystem II Protein Complex - metabolism
Photosystem II Protein Complex - ultrastructure
Plants - metabolism
Protein Structure, Tertiary
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Summary:•Plant LHCIIs have similar apoproteins but differ in oligomeric states and pigment contents.•The densely packed chlorophyll molecules of LHCII form sophisticated energy transfer pathways.•The structural bases for the mechanism of non-photochemical quenching are summarized. The antenna system associated with plant photosystem II (PSII) comprises a series of light-harvesting complexes II (LHCIIs) which are supramolecular assemblies of chlorophylls, carotenoids, lipids and integral membrane proteins. These complexes not only function in capturing and transmitting light energy, but also have pivotal roles in photoprotection under high-light conditions through a mechanism known as non-photochemical quenching process. Among them, the most abundant major species (majLHCII) is located at the periphery of PSII and forms homo/hetero-trimers. Besides, three minor species, named CP29, CP26 and CP24, are adjacent to the PSII core, exist in monomeric form and bridge the majLHCII trimers with the core complex. Structural studies on majLHCII and CP29 have revealed the overall architecture of plant LHC family, the binding sites of pigment molecules and the distribution pattern of chromophores in three-dimensional space. The high-resolution structural data of LHCIIs serve as fundamental bases for an improved understanding on the mechanisms of light harvesting, energy transfer and photoprotection processes in plants.
ISSN:0959-440X
1879-033X
DOI:10.1016/j.sbi.2013.04.004