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Appl Environ Microbiol. 1992 February; 58(2): 696-698

Potential early intermediates in anaerobic benzoate degradation by Rhodopseudomonas palustris.

Central Research and Development Department, E. I. du Pont de Nemours and Company, Wilmington, Delaware 19880-0402.

ABSTRACT

Alkali-treated extracts of Rhodopseudomonas palustris growing photosynthetically on benzoate were examined by gas chromatography/mass spectrometry for partially reduced benzoate derivatives. Two cyclic dienes, cyclohexa-2,5-diene-1-carboxylate and cyclohexa-1,4-diene-1-carboxylate, were detected. Either compound supported cell growth as effectively as benzoate. These results suggest that these cyclohexadienecarboxylates, probably as their coenzyme A esters, are the initial reduction products formed during anaerobic benzoate metabolism by R. palustris.

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