title: Conformational regulation of charge recombination reactions in a photosynthetic bacterial reaction center.
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.
authors.affiliation: Chalmers University of Technology, Department of Chemistry and Bioscience, PO Box 462, SE-405 30 Göteborg, Sweden.
authors.forename: Gergely
authors.initials: G
authors.lastname: Katona
authors.forename: Arjan
authors.initials: A
authors.lastname: Snijder
authors.forename: Pontus
authors.initials: P
authors.lastname: Gourdon
authors.forename: Ulf
authors.initials: U
authors.lastname: Andréasson
authors.forename: Orjan
authors.initials: O
authors.lastname: Hansson
authors.forename: Lars-Erik
authors.initials: LE
authors.lastname: Andréasson
authors.forename: Richard
authors.initials: R
authors.lastname: Neutze
mesh_terms: D003461:Crystallography; D004579:Electron Transport / Q000502:physiology; D008027:Light; D008958:Models, Molecular; D010777:Photochemistry; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation; D012242:Rhodobacter sphaeroides / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D045322:Photosynthetic Reaction Center Complex Proteins