| Photosynthetic vesicle architecture and constraints on efficient energy harvesting. | |
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MedLine Citation:
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PMID: 20655834 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Photosynthetic chromatophore vesicles found in some purple bacteria constitute one of the simplest light-harvesting systems in nature. The overall architecture of chromatophore vesicles and the structural integration of vesicle function remain poorly understood despite structural information being available on individual constituent proteins. An all-atom structural model for an entire chromatophore vesicle is presented, which improves upon earlier models by taking into account the stoichiometry of core and antenna complexes determined by the absorption spectrum of intact vesicles in Rhodobacter sphaeroides, as well as the well-established curvature-inducing properties of the dimeric core complex. The absorption spectrum of low-light-adapted vesicles is shown to correspond to a light-harvesting-complex 2 to reaction center ratio of 3:1. A structural model for a vesicle consistent with this stoichiometry is developed and used in the computation of excitonic properties. Considered also is the packing density of antenna and core complexes that is high enough for efficient energy transfer and low enough for quinone diffusion from reaction centers to cytochrome bc(1) complexes. |
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Authors:
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Melih Sener; Johan Strümpfer; John A Timney; Arvi Freiberg; C Neil Hunter; Klaus Schulten |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Biophysical journal Volume: 99 ISSN: 1542-0086 ISO Abbreviation: Biophys. J. Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-07-26 Completed Date: 2010-11-01 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 0370626 Medline TA: Biophys J Country: United States |
Other Details:
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Languages: eng Pagination: 67-75 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Biophysical Society. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Absorption Adaptation, Physiological / radiation effects Bacterial Chromatophores / chemistry, metabolism*, radiation effects Energy Metabolism* / radiation effects Energy Transfer / radiation effects Light Light-Harvesting Protein Complexes / metabolism Models, Biological* Models, Molecular Molecular Conformation Photosynthesis* / radiation effects Rhodobacter sphaeroides / cytology*, metabolism*, physiology, radiation effects Spectrum Analysis |
| Grant Support | |
ID/Acronym/Agency:
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P41-RR05969/RR/NCRR NIH HHS; //Biotechnology and Biological Sciences Research Council |
| Chemical | |
Reg. No./Substance:
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0/Light-Harvesting Protein Complexes |
| Comments/Corrections | |
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