IUBMB Enzyme Nomenclature


Accepted name: 17β-estradiol 17-dehydrogenase

Reaction: 17β-estradiol + NAD(P)+ = estrone + NAD(P)H + H+

Other name(s): 20α-hydroxysteroid dehydrogenase; 17β,20α-hydroxysteroid dehydrogenase; 17β-estradiol dehydrogenase; estradiol dehydrogenase; estrogen 17-oxidoreductase; 17β-HSD; HSD17B7

Systematic name: 17β-estradiol:NAD(P)+ 17-oxidoreductase

Comments: The enzyme oxidizes or reduces the hydroxy/keto group on C17 of estrogens and androgens in mammals and regulates the biological potency of these steroids. The mammalian enzyme is bifunctional and also catalyses EC, 3β-hydroxysteroid 3-dehydrogenase [3]. The enzyme also acts on (S)-20-hydroxypregn-4-en-3-one and related compounds, oxidizing the (S)-20-group, but unlike EC, 20α-hydroxysteroid dehydrogenase, it is Si-specific with respect to NAD(P)+.

Links to other databases: BRENDA, EXPASY, GTD, KEGG, Metacyc, PDB, CAS registry number: 9028-61-9


1. Kautsky, M.P. and Hagerman, D.D. 17β-Estradiol dehydrogenase of ovine ovaries. J. Biol. Chem. 245 (1970) 1978-1984. [PMID: 4314937]

2. Langer, L.J., Alexander, J.A. and Engel, L.L. Human placental estradiol-17β dehydrogenase. II. Kinetics and substrate specificities. J. Biol. Chem. 234 (1959) 2609-2614. [PMID: 14413943]

3. 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 1965, modified 1983, modified 1986, modified 2012]

Return to EC 1.1.1 home page
Return to EC 1.1 home page
Return to EC 1 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page