Document Detail

Large protein-induced dipoles for a symmetric carotenoid in a photosynthetic antenna complex.
MedLine Citation:
PMID:  1992518     Owner:  NLM     Status:  MEDLINE    
Unusually large electric field effects have been measured for the absorption spectra of carotenoids (spheroidene) in the B800-850 light-harvesting complex from the photosynthetic bacterium Rhodobacter sphaeroides. Quantitative analysis shows that the difference in the permanent dipole moment between the ground state and excited states in this protein complex is substantially larger than for pure spheroidene extracted from the protein. The results demonstrate the presence of a large perturbation on the electronic structure of this nearly symmetric carotenoid due to the organized environment in the protein. This work also provides an explanation for the seemingly anomalous dependence of carotenoid band shifts on transmembrane potential and a generally useful approach for calibrating electric field-sensitive dyes that are widely used to probe potentials in biological systems.
D S Gottfried; M A Steffen; S G Boxer
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  251     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1991 Feb 
Date Detail:
Created Date:  1991-03-13     Completed Date:  1991-03-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  662-5     Citation Subset:  IM    
Department of Chemistry, Stanford University, CA 94305.
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MeSH Terms
Bacterial Proteins / chemistry*
Carotenoids / chemistry*
Cell Membrane / physiology
Chemistry, Physical
Macromolecular Substances
Membrane Potentials
Membrane Proteins / physiology
Physicochemical Phenomena
Rhodobacter sphaeroides / physiology*
Spectrum Analysis
Grant Support
Reg. No./Substance:
0/Bacterial Proteins; 0/Macromolecular Substances; 0/Membrane Proteins; 0/Solvents; 13836-61-8/spheroidene; 36-88-4/Carotenoids

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

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