Hydroxysteroid dehydrogenase

Steroid numbering.

The hydroxysteroid dehydrogenases are a group of alcohol oxidoreductases that catalyze the dehydrogenation of hydroxysteroids.

There are four types, classified by the number of the carbon acted upon:

Carbon	From	To
3	pregnenolone	progesterone
3	17-Hydroxypregnenolone	17-Hydroxyprogesterone
3	dehydroepiandrosterone	androstenedione
11	cortisol	cortisone
17	androstenedione	testosterone
20	progesterone	20-alpha-dihydroprogesterone

See also

• steroid hydroxylases

Additional images

• 

  Steroidogenesis

External links

• Hydroxysteroid Dehydrogenases at the US National Library of Medicine Medical Subject Headings (MeSH)