Abstract
The effects of adenosine 3′,5′-cyclic monophosphoric acid (cAMP) on a number of reactions catalyzed by isolated chromatophores of Rhodospirillum rubrum were examined and compared with those produced by adenosine 5′-monophosphoric acid (AMP). Photophosphorylation and dark ATPase are inhibited about 50% by 10 mM cAMP, while 10 mM AMP has no inhibitory effect. NAD photoreduction and energy-linked transhydrogenation are more strongly inhibited by cAMP than by AMP, thus demonstrating a marked inhibitory effect of a naturally occuring nucleotide on energy-linked reactions in isolated chromatophores. Cyclic AMP phosphodiesterase can be demonstrated as a soluble enzyme which is not associated with the chromatophore fraction.
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