SUMMARY: All the enzymes of the tricarboxylic acid cycle have now been demonstrated in extracts of grown in armadillo liver. Many were also present in homogenates of host-tissue, but biochemical evidence is presented which indicates that all enzymes detected in extracts from were authentic bacterial enzymes. Further evidence for a complete tricarboxylic acid cycle in was obtained by first establishing that citrate could be taken up and catabolized by whole organisms, then showing that oxidation of radioisotopically labelled pyruvate to CO by suspensions of was stimulated by adding unlabelled citrate. Control of tricarboxylic acid cycle activity in by the inactivation of fumarase by a protease is speculated upon.


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