Document Detail

Chlorophyll fluorescence quenching in isolated light harvesting complexes induced by zeaxanthin.
MedLine Citation:
PMID:  10760515     Owner:  NLM     Status:  MEDLINE    
Non-photochemical quenching of chlorophyll fluorescence in plants occurs in the light harvesting antenna of photosystem II and is regulated by the xanthophyll cycle. A new in vitro model for this process has been developed. Purified light harvesting complexes above the detergent critical micelle concentration have a stable high fluorescence yield but a rapidly inducible fluorescence quenching occurs upon addition of zeaxanthin. Violaxanthin was without effect, lutein and antheraxanthin induced a marginal response, whereas the violaxanthin analogue, auroxanthin, induced strong quenching. Quenching was not caused by aggregation of the complexes but was accompanied by a spectral broadening and red shift, indicating a zeaxanthin-dependent alteration in the chlorophyll environment.
M Wentworth; A V Ruban; P Horton
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  FEBS letters     Volume:  471     ISSN:  0014-5793     ISO Abbreviation:  FEBS Lett.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-05-09     Completed Date:  2000-05-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0155157     Medline TA:  FEBS Lett     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  71-4     Citation Subset:  IM    
Robert Hill Institute for Photosynthesis Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, Sheffield, UK.
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MeSH Terms
Chlorophyll / chemistry*,  metabolism
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins / drug effects*,  metabolism
Photosystem II Protein Complex
Spinacia oleracea / metabolism
beta Carotene / analogs & derivatives*,  pharmacology
Reg. No./Substance:
0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Photosystem II Protein Complex; 0/Xanthophylls; 126-29-4/violaxanthin; 1406-65-1/Chlorophyll; 144-68-3/zeaxanthin; 7235-40-7/beta Carotene

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