a 3alpha-hydroxy bile acid CoA ester + NAD+ = a 3-oxo bile acid CoA ester + NADH + H+
Substrate
3alpha-hydroxy bile acid CoA ester;
NAD+ [CPD:C00003]
Product
3-oxo bile acid CoA ester;
NADH [CPD:C00004];
H+ [CPD:C00080]
Comment
This bacterial enzyme is involved in the 7-dehydroxylation process associated with bile acid degradation. The enzyme has very little activity with unconjugated bile acid substrates. It has similar activity with choloyl-CoA, chenodeoxycholoyl-CoA, deoxycholoyl-CoA, and lithocholoyl-CoA.
Expression in Escherichia coli and characterization of a bile acid-inducible 3 alpha-hydroxysteroid dehydrogenase from Eubacterium sp. strain VPI 12708.