1.1.1.159 cholate + NAD+ = 3alpha,12alpha-dihydroxy-7-oxo-5beta-cholan-24-oate + NADH + H+ belongs to the short-chain dehydrogenase/reductase 1 familiy (SDR), mechanism 286081 1.1.1.159 cholate + NAD+ = 3alpha,12alpha-dihydroxy-7-oxo-5beta-cholan-24-oate + NADH + H+ catalyses the oxidation of the 7alpha-hydroxyl group of bile acids and alcohols both in their free and conjugated forms. The Bacteroides fragilis and Clostridium enzymes can also utilize NADP+ - 1.1.1.159 cholate + NAD+ = 3alpha,12alpha-dihydroxy-7-oxo-5beta-cholan-24-oate + NADH + H+ short-chain dehydrogenase group 286084 1.1.1.159 cholate + NAD+ = 3alpha,12alpha-dihydroxy-7-oxo-5beta-cholan-24-oate + NADH + H+ Tyr159 acts as basic catalyst, Lys163 binds to NAD(H) and lowers the pKa value of Tyr159, Ser146 stabilizes the substrate, reaction intermediate and product in catalysis 286083