Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 12, Issue 7, Pages 630-631Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb948
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In bright light the photosynthetic reaction center ( RC) of Rhodobacter sphaeroides stabilizes the P-870(+) center dot 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.
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