COMPARATIVE STUDIES WITH THE PHOTOOXIDASE OF RHODOSPIRILLUM

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Abstract
When heterotrophically grown Rhodospirillum rubrum was reincubated anaerobically in the light, the photosynthetic growth resulted in a simultaneous appearance of the photosynthetic pigments, photooxidation, and photophosphorylation. Addition of exogenous diphosphopyridine nucleotide to extracts of photosynthetically grown cells inhibited photooxidation while photophosphorylation was stimulated. Ultraviolet irradiation inhibited photophosphorylation and added menadione relieved the inhibition. Photooxidase was less inhibited by this irradiation and menadione had no effect. No direct relationship between photooxidation and photophosphorylation could be shown.