Summary: Whole cells of the fungus can oxidize acetate, -aconitate, citrate, fumarate, glucose, malate, α-ketoglutarate, pyruvate, and succinate under appropriate conditions. The rates of oxidation of acetate and succinate, in particular, are very high and exceed the rate of glucose oxidation. Diethylmalonate in high concentration inhibits the oxidation of glucose and acetate, but succinate oxidation is not greatly inhibited by malonic acid, even when the malonate concentration is twice the succinate concentration.

By freezing the cells in liquid nitrogen it is possible to investigate many of the individual reactions of the tricarboxylic acid cycle. Among the more important reactions shown were: -aconitate to citrate; citrate or -aconitate to α-ketoglutarate; α-ketoglutarate to succinate; succinate to fumarate plus malate; malate to oxalacetate plus pyruvate; and malate or pyruvate to citrate. Acetate was not metabolized. Succinate oxidation was competitively inhibited by malonate. The significance of these results with regard to the operation of the citric acid cycle in this organism is discussed.


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