The Enzyme Database

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Accepted name: 3β-hydroxysteroid 3-dehydrogenase
Reaction: a 3β-hydroxysteroid + NADP+ = a 3-oxosteroid + NADPH + H+
For diagram of sterol ring A modification, click here
Other name(s): 3-keto-steroid reductase; 3-KSR; HSD17B7 (gene name); ERG27 (gene name)
Systematic name: 3β-hydroxysteroid:NADP+ 3-oxidoreductase
Comments: The enzyme acts on multiple 3β-hydroxysteroids. Participates in the biosynthesis of zemosterol and cholesterol, where it catalyses the reaction in the opposite direction to that shown. The mammalian enzyme is bifunctional and also catalyses EC, 17β-estradiol 17-dehydrogenase [4].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 42616-29-5
1.  Swindell, A.C. and Gaylor, J.L. Investigation of the component reactions of oxidative sterol demethylation. Formation and metabolism of 3-ketosteroid intermediates. J. Biol. Chem. 243 (1968) 5546–5555. [PMID: 4387005]
2.  Billheimer, J.T., Alcorn, M. and Gaylor, J.L. Solubilization and partial purification of a microsomal 3-ketosteroid reductase of cholesterol biosynthesis. Purification and properties of 3β-hydroxysteroid dehydrogenase and Δ5-3-ketosteroid isomerase from bovine corpora lutea. Arch. Biochem. Biophys. 211 (1981) 430–438. [PMID: 6946726]
3.  Gachotte, D., Sen, S.E., Eckstein, J., Barbuch, R., Krieger, M., Ray, B.D. and Bard, M. Characterization of the Saccharomyces cerevisiae ERG27 gene encoding the 3-keto reductase involved in C-4 sterol demethylation. Proc. Natl. Acad. Sci. USA 96 (1999) 12655–12660. [PMID: 10535978]
4.  Marijanovic, Z., Laubner, D., Moller, G., Gege, C., Husen, B., Adamski, J. and Breitling, R. Closing the gap: identification of human 3-ketosteroid reductase, the last unknown enzyme of mammalian cholesterol biosynthesis. Mol. Endocrinol. 17 (2003) 1715–1725. [PMID: 12829805]
[EC created 2002, modified 2012]

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