American Association for the Advancement of Science, Science, 5978(328), p. 630-633, 2010
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Light Structures Absorption of light by photosynthetic reaction centers causes structural changes and triggers a series of electron transfer reactions, resulting in a transmembrane potential difference that can be used to drive the subsequent chemistry. The initial electron transfer generates a charge-separated state that must be stabilized to prevent dissipation of energy through recombination. Wöhri et al. (p. 630 ) have used time-resolved Laue diffraction crystallography to observe light-induced conformational changes that occur within milliseconds of photooxidation of the dimer of bacteriochlorophyll molecules, known as the “special pair,” in the photosynthetic reaction center of Blastochloris viridis . Stabilization appears to occur because of the deprotonation of a conserved tyrosine residue that moves closer to the special pair.