Abstract
1. Among the several enzyme activities in rabbit liver cytosol able to dehydrogenate 1-indanol, only the main activity was not separable from 3-hydroxyhexobarbital dehydrogenase during purification including polyacrylamide gel disc electrophoresis. 2. Results of mixed substrate method indicated that the same enzyme catalyses the dehydrogenation of 1-indanol and 3-hydroxyhexobarbital. The ratio between the two dehydrogenation activities was almost constant as the enzyme underwent thermal inactivation. The Ki values of p-chloromercuribenzoate, the Km values for NAD+, and the Km values for NADP+ were very similar for the two dehydrogenations. These results lead to the conclusion that the same enzyme catalyses the dehydrogenation of 3-hydroxyhexobarbital and 1-indanol. 3. 1-Tetralol, 1-acenaphthenol, 9-fluorenol, thiochroman-4-ol and 4-chromanol also served as substrate of the enzyme, but 2-indanol, 2-tetralol, and trans- and cis-indan-1,2-diol were not oxidized. 4. Reversibility of the reaction was also confirmed using 1-indanone as substrate.
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