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J. Bacteriol., 07 1995, 3870-3872, Vol 177, No. 13
Copyright © 1995, American Society for Microbiology

Pathway of butyrate catabolism by Desulfobacterium cetonicum

PH Janssen and B Schink
Fakultat fur Biologie, Universitat Konstanz, Germany.

Desulfobacterium cetonicum 480 oxidized butyrate to 1 mol of acetate and 2 mol of CO2; this reaction was coupled to reduction of sulfate to sulfide. Butyrate was activated by coenzyme A (CoA) transfer from acetyl-CoA, and butyryl-CoA was oxidized to acetyl-CoA by a classical beta-oxidation pathway. Acetyl-CoA was oxidized through the acetyl- CoA/carbon monoxide dehydrogenase pathway. There was a rapid exchange of 14CO2 into the intermediate CoA esters and into acetate and butyrate, showing that all of the steps involved in the oxidation of butyrate to acetyl-CoA are reversible.

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