Catalyzes the stereospecific NADPH-dependent reduction of the C4-C5 double bond of bile acid intermediates and steroid hormones carrying a delta(4)-3-one structure to yield an A/B cis-ring junction. This cis-configuration is crucial for bile acid biosynthesis and plays important roles in steroid metabolism. Capable of reducing a broad range of delta-(4)-3-ketosteroids from C18 (such as, 17beta-hydroxyestr-4-en-3-one) to C27 (such as, 7alpha-hydroxycholest-4-en-3-one).

Belongs to the aldo/keto reductase family.

326 amino acids

MNLSTANHHIPLNDGNSIPIIGLGTYSDPRPVPGKTFIAVKTAIDEGYRHIDGAYVYRNEHEVGEAIREKVAEGKVKREEIFYCGKLWSTDHDPEMVRPALERTLQTLKLDYIDLYIIEMPMAFKPGEEFYPKDENGRVIYHKSNLCATWEALEACKDAGLVKSLGVSNFNRRQLEVILNKPGLKYKPVTNQVECHPYFTQTKLLEVSASSMTSFIVAYSPLGTCRNPLWVNVSSPPLLKDELLTSLGKKYNKTQAQIVLRFDIQRGLVVIPKSTTPERIKENFQIFDFSLTKEEMKDIEALNKNVRFVEMLMWSDHPEYPFHDEY

37.4 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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