Fermentation of fructose and synthesis of acetate from carbon dioxide by Clostridium formicoaceticum.
Clostridium formicoaceticum ferments fructose labeled with (14)C in carbon 1, 4, 5, or 6 via the Embden Meyerhof pathway. In fermentations of fructose in the presence of (14)CO(2), acetate is formed labeled equally in both carbons. Extracts convert the methyl groups of 5-methyltetrahydrofolate and methyl-B(12) to the methyl group of acetate in the presence of pyruvate. Formate dehydrogenase, 10-formyltetrahydrofolate synthetase, 5,10-methenyltetrahydrofolate cyclohydrolase, 5,10-methylenetetrahydrofolate dehydrogenase, and 5,10-methylenetetrahydrofolate reductase are present in extracts of C. formicoaceticum. These enzymes are needed for the conversion of CO(2) to 5-methyltetrahydrofolate. It is proposed that acetate is totally synthesized from CO(2) via the reactions catalyzed by the enzymes listed above and that 5-methyltetra-hydrofolate and a methylcorrinoid are intermediates in this synthesis.
28 references, click to expand
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