During the course of studies on the mechanism of electron transport as catalyzed by cytochrome c , we have found that ferri‐horse heart cytochrome c will undergo photoreduction. We have characterized the photoreduction of horse heart cytochrome c in regard to the photochemistry, the nature of the electron donor, and effect of solvent (pH, solvent perturbation, ionic strength). We conclude that ferri‐horse heart cytochrome c undergoes photoreduction mediated by a light‐induced heme excited state. Further, the protein moiety of cytochrome c serves in part to quench the formation of the excited state, and also to control the interaction of the electron donor and photo‐excited cytochrome.
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Vorkink et al. (1974) studied this question.
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