Abstract
Thiosulfate-cytochrome c-551 reductase derived from Chlorobium thiosulfatophilum has been highly purified. The enzyme reduces cytochrome c-551 of C. thiosulfatophilum in the presence of thiosulfate while cytochrome c -555 of the organism is not reduced by the enzyme. Cytochrome c -555 reacts with the enzyme at an appreciable rate only in the presence of cytochrome c -551. However, the reduction rate of cytochrome c -551 by the enzyme is greatly enhanced on addition of a catalytic amount of cytochrome c -555. Therefore, cytochrome c -555 seems to function as an effector on thiosulfate-cytochrome c -551 reductase as well as it acts as the electron donor to the light-excited chlorobium chlorophylls.
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