Document Detail

Optimization of light harvesting and photoprotection: molecular mechanisms and physiological consequences.
MedLine Citation:
PMID:  23148272     Owner:  NLM     Status:  MEDLINE    
The distinctive lateral organization of the protein complexes in the thylakoid membrane investigated by Jan Anderson and co-workers is dependent on the balance of various attractive and repulsive forces. Modulation of these forces allows critical physiological regulation of photosynthesis that provides efficient light-harvesting in limiting light but dissipation of excess potentially damaging radiation in saturating light. The light-harvesting complexes (LHCII) are central to this regulation, which is achieved by phosphorylation of stromal residues, protonation on the lumen surface and de-epoxidation of bound violaxanthin. The functional flexibility of LHCII derives from a remarkable pigment composition and configuration that not only allow efficient absorption of light and efficient energy transfer either to photosystem II or photosystem I core complexes, but through subtle configurational changes can also exhibit highly efficient dissipative reactions involving chlorophyll-xanthophyll and/or chlorophyll-chlorophyll interactions. These changes in function are determined at a macroscopic level by alterations in protein-protein interactions in the thylakoid membrane. The capacity and dynamics of this regulation are tuned to different physiological scenarios by the exact protein and pigment content of the light-harvesting system. Here, the molecular mechanisms involved will be reviewed, and the optimization of the light-harvesting system in different environmental conditions described.
Peter Horton
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  367     ISSN:  1471-2970     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-13     Completed Date:  2013-04-22     Revised Date:  2014-01-10    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  3455-65     Citation Subset:  IM    
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MeSH Terms
Arabidopsis / genetics,  metabolism,  physiology*,  radiation effects
Chlorophyll / metabolism
Cold Temperature
Electron Transport
Light-Harvesting Protein Complexes / genetics,  metabolism*
Photochemical Processes
Photosystem I Protein Complex / genetics,  metabolism
Photosystem II Protein Complex / metabolism
Protein Interaction Mapping
Thylakoids / metabolism*,  physiology,  radiation effects
Xanthophylls / genetics,  metabolism
Reg. No./Substance:
0/Light-Harvesting Protein Complexes; 0/Photosystem I Protein Complex; 0/Photosystem II Protein Complex; 0/Xanthophylls; 1406-65-1/Chlorophyll; 51C926029A/violaxanthin

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