Document Detail

Light-induced structural changes in a photosynthetic reaction center caught by Laue diffraction.
MedLine Citation:
PMID:  20431017     Owner:  NLM     Status:  MEDLINE    
Photosynthetic reaction centers convert the energy content of light into a transmembrane potential difference and so provide the major pathway for energy input into the biosphere. We applied time-resolved Laue diffraction to study light-induced conformational changes in the photosynthetic reaction center complex of Blastochloris viridis. The side chain of TyrL162, which lies adjacent to the special pair of bacteriochlorophyll molecules that are photooxidized in the primary light conversion event of photosynthesis, was observed to move 1.3 angstroms closer to the special pair after photoactivation. Free energy calculations suggest that this movement results from the deprotonation of this conserved tyrosine residue and provides a mechanism for stabilizing the primary charge separation reactions of photosynthesis.
Annemarie B W?hri; Gergely Katona; Linda C Johansson; Emelie Fritz; Erik Malmerberg; Magnus Andersson; Jonathan Vincent; Mattias Eklund; Marco Cammarata; Michael Wulff; Jan Davidsson; Gerrit Groenhof; Richard Neutze
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  328     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-30     Completed Date:  2010-05-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  630-3     Citation Subset:  IM    
Department of Chemical and Biological Engineering, Chalmers University of Technology, Box 462, SE-40530 G?teborg, Sweden.
Data Bank Information
Bank Name/Acc. No.:
PDB/2X5U;  2X5V
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MeSH Terms
Bacterial Proteins / chemistry*,  metabolism
Bacteriochlorophylls / chemistry,  metabolism
Crystallography, X-Ray
Cytochromes c / chemistry,  metabolism
Electron Transport
Hydrogen Bonding
Hydrogen-Ion Concentration
Hyphomicrobiaceae / chemistry*,  metabolism
Models, Molecular
Molecular Dynamics Simulation
Photosynthetic Reaction Center Complex Proteins / chemistry*,  metabolism
Protein Conformation
Quinones / chemistry,  metabolism
Reg. No./Substance:
0/Bacterial Proteins; 0/Bacteriochlorophylls; 0/Photosynthetic Reaction Center Complex Proteins; 0/Protons; 0/Quinones; 9007-43-6/Cytochromes c

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

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