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Scolnick, Edward M. (Harvard Medical School, Boston, Mass.)and Edmund C. C. Lin . Parallel induction ofd -arabitol andd -sorbitol dehydrogenases. J. Bacteriol.84: 631–637. 1962.—Two inducible diphosphopyridine nucleotide-linked dehydrogenases are described in a bacterium isolated from the soil,Cellvibrio polyoltrophicus ATCC 14774. The first enzyme catalyzes the dehydrogenation ofd -arabitol tod -xylulose andd -mannitol tod -fructose. The data suggest that in vivo this enzyme has the dual function of the utilization of both of these polyhydric alcohols. The second enzyme was found to act only ond -sorbitol, converting it tod -fructose. Evidence for its physiological function as ad -sorbitol dehydrogenase is also given. Both of these enzymes were found to be induced in parallel by any of the three polyhydric alcohols,d -arabitol,d -mannitol, andd -sorbitol. A common stereoconfiguration of the inducers for these enzymes is suggested. The parallel evolution of substrate specificity and inducer specificity is discussed with respect to the functional advantage that such a selective process might offer.

PARALLEL INDUCTION OF d -ARABITOL AND d -SORBITOL DEHYDROGENASES