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Ibanez , M. L. (The Pennsylvania State University, University Park)and E. S. Lindstrom . Metabolism of sulfate by the chromatophore ofRhodospirillum . J. Bacteriol.84: 451–455. 1962.—The chromatophore ofRhodospirillum rubrum was shown to possess enzymes for the activation and reduction of inorganic sulfate. The chromatophore was able to synthesize 3′-phosphoadenosine 5′-phosphosulfate (PAPS), using either exogenous adenosine triphosphate (ATP) or ATP synthesized via photophosphorylation. Light was required for the reduction of sulfate to a volatile form, presumably sulfite. Light enhanced the incorporation of sulfate-sulfur into cystine, cysteine, and cysteic acid of the chromatophore. This incorporation was probably the result of exchange reactions of reduced sulfur, not the result of net synthesis. The 100:1 ratio of the activation to reduction of sulfate and the inhibition of the reduction by exogenous ATP suggested that PAPS might not be the substrate for chromatophoral sulfate reduction.

METABOLISM OF SULFATE BY THE CHROMATOPHORE OF RHODOSPIRILLUM