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Proposed pathway for propionate conversion by S. propionica. Step 1, condensation of the C2 of propionate to the carboxyl of another propionate molecule or derivative; step 2, rearrangement of the methyl group and transfer of the oxygen to the C3 of the intermediate; step 3, cleavage of 3-ketohexanoate yielding butyrate and acetate; step 4, syntrophic β-oxidation of butyrate to acetate.
