Function:3-alpha-hydroxysteroid dehydrogenase that converts 3-alpha-tetrahydroprogesterone (allopregnanolone) to dihydroxyprogesterone and 3-alpha-androstanediol to dihydroxyprogesterone. May play a role in the biosynthesis of retinoic acid from retinaldehyde , but seems to have low activity with retinoids. Can utilize both NADH and NADPH. ,similarity:Belongs to the short-chain dehydrogenases/reductases (SDR) family. ,subcellular location:Associated with microsomal membranes. ,subunit:Homotetramer. ,tissue specificity:Highly expressed in trachea and epidermis. Detected at lower levels in spinal cord , bone marrow , brain , tongue , esophagus , heart , colon , testis , placenta , lung , skeletal muscle and lymph node. ,
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