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The sorbitol dehydrogenase (L-iditol: NAD oxidoreductase, EC 1.1.1.14) from mouse liver has been purified to homogeneity. 2. The enzyme has a mol. wt of 140,000 and is composed of four identical subunits of mol. wt 35,000. 3. the purified enzyme catalyses both sorbitol oxidation and fructose reduction. 4. It is specific for NAD+ (NADH) and does not function with NADP+ (NADPH). 5. The Michaelis constants for sorbitol, fructose, NAD+ and NADPH are 1.54 and 154 mM, 58.8 and 15 microM, respectively. 6. The enzyme is SH-group reagent sensitive and is strongly inhibited by 1,10-phenanthroline.

The sorbitol dehydrogenase (L-iditol: NAD oxidoreductase, EC 1.1.1.14) from mouse liver has been purified to homogeneity. 2. The enzyme has a mol. wt of 140,000 and is composed of four identical subunits of mol. wt 35,000. 3. the purified enzyme catalyses both sorbitol oxidation and fructose reduction. 4. It is specific for NAD+ (NADH) and does not function with NADP+ (NADPH). 5. The Michaelis constants for sorbitol, fructose, NAD+ and NADPH are 1.54 and 154 mM, 58.8 and 15 microM, respectively. 6. The enzyme is SH-group reagent sensitive and is strongly inhibited by 1,10-phenanthroline.

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