3-ketosteroid-9-alpha-monooxygenase, oxygenase component

UniProtKB accession:  F1CMX0

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UniProtKB description:  May be involved in the degradation of cholic acid, a steroid acid found predominantly in the bile (PubMed:21642460). In vitro, catalyzes the introduction of a 9alpha-hydroxyl moiety into the ring B of 3-ketosteroid substrates such as 1,4-androstadiene-3,17-dione (ADD), 4-androstene-3,17-dione (AD), 4-androstene-17beta-ol-3-one (testosterone), 4-pregnene-3,20-dione (progesterone), 3-oxo-23,24-bisnorcholesta-4-en-22-oate (4-BNC), 23,24-bisnorcholesta-4-ene-22-oate, 3-oxo-23,24-bisnorcholaesta-1,4-dien-22-oate (1,4-BNC), 23,24-bisnorcholesta-1,4-diene-22-oate and 3-oxo-23,24-bisnorcholesta-1,4-dien-22-oyl-coenzyme A thioester (1,4-BNC-CoA) (PubMed:21642460, PubMed:25049233). KshA1 has the highest specificity for steroids possessing an isopropionyl side chain at C17 (PubMed:25049233).