Hydroxysteroid dehydrogenases (HSDs) are a group of alcohol oxidoreductases that catalyze the dehydrogenation of hydroxysteroids. These enzymes also catalyze the reverse reaction, acting as ketosteroid reductases (KSRs).
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Steroidogenesis.svg/450px-Steroidogenesis.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Trimethyl_steroid-nomenclature.png/250px-Trimethyl_steroid-nomenclature.png)
There are four types, classified by the number of the position acted upon:
See also
editExternal links
edit- Hydroxysteroid+Dehydrogenases at the U.S. National Library of Medicine Medical Subject Headings (MeSH)