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A new class EC 7, Translocases, has been added to the EC list. It will be part of ENZYME from release 2018_10. Read more about EC 7 here.

ENZYME entry: EC

Accepted Name
3-alpha-hydroxysteroid 3-dehydrogenase.
Alternative Name(s)
3-alpha-hydroxysteroid dehydrogenase.
Reaction catalysed
A 3-alpha-hydroxysteroid + NAD(P)(+) <=> a 3-oxosteroid + NAD(P)H
  • The enzyme acts on multiple 3-alpha-hydroxysteroids, such as androsterone and 5 alpha-dihydrotestosterone.
  • The mammalian enzymes are involved in inactivation of steroid hormones, while the bacterial enzymes are involved in steroid degradation.
  • This entry stands for enzymes whose stereo-specificity with respect to NAD(+) or NADP(+) is not known (cf. EC and EC
PRIAM enzyme-specific profiles1.1.1.357
KEGG Ligand Database for Enzyme Nomenclature1.1.1.357
IUBMB Enzyme Nomenclature1.1.1.357
MEDLINEFind literature relating to
P52895, AK1C2_HUMAN;  P42330, AK1C3_HUMAN;  Q5R7C9, AK1C3_PONAB;  
P17516, AK1C4_HUMAN;  Q95JH5, AK1C4_MACFA;  Q95JH4, AK1C4_MACFU;  

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