Abstract
The metabolic transformation pathway for cyclic imides in microorganisms was studied in Blastobacter sp. strain A17p-4. This novel pathway involves, in turn, hydrolytic ring opening of a cyclic imide to yield a monoamidated dicarboxylate, hydrolytic deamidation of the monoamidated dicarboxylate to yield a dicarboxylate, and dicarboxylate transformation similar to that in the tricarboxylic acid cycle. The initial step is catalyzed by a novel enzyme, imidase. Imidase and subsequent enzymes involved in this metabolic pathway are induced by some cyclic imides, such as succinimide and glutarimide. Induced cells metabolize various cyclic imides.
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