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Nat Struct Mol Biol. 2005 Jul;12(7):630-1. Epub 2005 Jun 5.

Conformational regulation of charge recombination reactions in a photosynthetic bacterial reaction center.

Author information

1
Chalmers University of Technology, Department of Chemistry and Bioscience, PO Box 462, SE-405 30 Göteborg, Sweden.

Abstract

In bright light the photosynthetic reaction center (RC) of Rhodobacter sphaeroides stabilizes the P(+)(870).Q(-)(A) charge-separated state and thereby minimizes the potentially harmful effects of light saturation. Using X-ray diffraction we report a conformational change that occurs within the cytoplasmic domain of this RC in response to prolonged illumination with bright light. Our observations suggest a novel structural mechanism for the regulation of electron transfer reactions in photosynthesis.

PMID:
15937492
DOI:
10.1038/nsmb948
[Indexed for MEDLINE]

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