Document Detail


Carotenoid-dependent oligomerization of the major chlorophyll a/b light harvesting complex of photosystem II of plants.
MedLine Citation:
PMID:  9201929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Under many environmental conditions, plants are exposed to levels of sunlight in excess of those required for photosynthesis. Then, a regulated increase in the rate of nonradiative dissipation of excess excitation energy in the thylakoid membrane correlates with the conversion of the carotenoid violaxanthin into zeaxanthin and provides protection from the damaging effects of excessive irradiation. The hypothesis that these carotenoids specifically control the oligomerization of the light harvesting complexes of photosystem II was tested by investigating the effects of violaxanthin and zeaxanthin on the behavior of the major complex, LHCIIb, on sucrose gradients; it was found that zeaxanthin stimulated the formation of LHCIIb aggregates with reduced chlorophyll fluorescence yield whereas violaxanthin caused the inhibition of such aggregation and an elevation of fluorescence. Measurements of 77 K fluorescence indicated that zeaxanthin was not exerting an additional direct quenching of chlorophyll fluorescence. These effects can explain the physiological control of the light harvesting system by the xanthophyll cycle.
Authors:
A V Ruban; D Phillip; A J Young; P Horton
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biochemistry     Volume:  36     ISSN:  0006-2960     ISO Abbreviation:  Biochemistry     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-07-21     Completed Date:  1997-07-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370623     Medline TA:  Biochemistry     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  7855-9     Citation Subset:  IM    
Affiliation:
Robert Hill Institute for Photosynthetic Research, Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, U.K.
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MeSH Terms
Descriptor/Qualifier:
Biopolymers
Fluorescence
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins / chemistry*
Photosystem II Protein Complex
Plants / chemistry*
Xanthophylls
beta Carotene / analogs & derivatives*,  chemistry
Chemical
Reg. No./Substance:
0/Biopolymers; 0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Photosystem II Protein Complex; 0/Xanthophylls; 126-29-4/violaxanthin; 144-68-3/zeaxanthin; 7235-40-7/beta Carotene

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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