Document Detail

Resonance Raman spectroscopy of the photosystem II light-harvesting complex of green plants: a comparison of trimeric and aggregated states.
MedLine Citation:
PMID:  7857944     Owner:  NLM     Status:  MEDLINE    
Resonance Raman spectroscopy was performed on photosystem II light-harvesting complex (LHCII) in trimeric and oligomeric states with various excitation conditions. From these studies, it can be concluded that the structure of LHCII is altered during the trimer/oligomer transition. These structural changes affect the conformation of a population of carotenoid within the complex, which becomes twisted in the oligomeric form. Moreover, the interactions assumed by a chlorophyll a and a chlorophyll b are modified during the oligomerization process. This induces the formation of an H-bond to a formyl group of a chlorophyll b molecule and to a keto group of a chlorophyll a molecule. The extent to which these H-bonds to chlorophyll relate to the formation of the quencher cannot yet be precisely established. However, the structural changes they evidence may play a role in the control of the energy flux by LHCII complexes.
A V Ruban; P Horton; B Robert
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Biochemistry     Volume:  34     ISSN:  0006-2960     ISO Abbreviation:  Biochemistry     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-03-22     Completed Date:  1995-03-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370623     Medline TA:  Biochemistry     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2333-7     Citation Subset:  IM    
Robert Hill Institute, Department of Molecular Biology and Biotechnology, University of Sheffield, U.K.
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MeSH Terms
Carotenoids / chemistry
Chlorophyll / chemistry
Hydrogen Bonding
Light-Harvesting Protein Complexes
Photosynthetic Reaction Center Complex Proteins / chemistry*
Photosystem II Protein Complex
Spectrum Analysis, Raman
Spinacia oleracea
Reg. No./Substance:
0/Light-Harvesting Protein Complexes; 0/Photosynthetic Reaction Center Complex Proteins; 0/Photosystem II Protein Complex; 1406-65-1/Chlorophyll; 36-88-4/Carotenoids; 479-61-8/chlorophyll a; 519-62-0/chlorophyll b

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