12beta-hydroxysteroid dehydrogenase

In enzymology, a 12beta-hydroxysteroid dehydrogenase (EC 1.1.1.238) is an enzyme that catalyzes the chemical reaction 3alpha,7alpha,12beta-trihydroxy-5beta-cholanate + NADP+ ⇌ {\displaystyle \rightleftharpoons } 3alpha,7alpha-dihydroxy-12-oxo-5beta-cholanate + NADPH + H+ Thus, the two substrates of this enzyme are 3alpha,7alpha,12beta-trihydroxy-5beta-cholanate and NADP+, whereas its 3 products are 3alpha,7alpha-dihydroxy-12-oxo-5beta-cholanate, NADPH, and H+. This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 12beta-hydroxysteroid:NADP+ 12-oxidoreductase. Other names in common use include 12beta-hydroxy steroid (nicotinamide adenine dinucleotide phosphate), and dehydrogenase. == References == Edenharder R, Pfutzner A (1988). "Characterization of NADP-dependent 12 beta-hydroxysteroid dehydrogenase from Clostridium paraputrificum". Biochim. Biophys. Acta. 962 (3): 362–70. doi:10.1016/0005-2760(88)90266-4. PMID 3167086.