Crystalline ferredoxin from the photosynthetic bacterium chromatium

Abstract

Ferredoxin has been isolated and crystallized from the photosynthetic bacterium Chromatium. It is similar to other ferredoxins in having an equivalent amount of iron and inorganic sulfide, a strongly electronegative oxidative-reduction potential and a capacity to substitute for native chloroplast ferredoxin in mediating the reduction of NADP⁺. Chromatium ferredoxin differs in its iron content and its more electronegative oxidation-reduction potential from the other ferredoxins that have been isolated so far.