| Large protein-induced dipoles for a symmetric carotenoid in a photosynthetic antenna complex. | |
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MedLine Citation:
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PMID: 1992518 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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D S Gottfried; M A Steffen; S G Boxer |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Science (New York, N.Y.) Volume: 251 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1991 Feb |
Date Detail:
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Created Date: 1991-03-13 Completed Date: 1991-03-13 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0404511 Medline TA: Science Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 662-5 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Stanford University, CA 94305. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bacterial Proteins
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chemistry* Carotenoids / chemistry* Cell Membrane / physiology Chemistry, Physical Macromolecular Substances Membrane Potentials Membrane Proteins / physiology Photosynthesis* Physicochemical Phenomena Rhodobacter sphaeroides / physiology* Solvents Spectrum Analysis |
| Grant Support | |
ID/Acronym/Agency:
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GM07365/GM/NIGMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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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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