Tags: Enzyme.
In enzymology a cholestanetetraol 26-dehydrogenase (EC 1.1.1.161) is an enzyme that catalyzes the chemical reaction(25R)-5beta-cholestane-3alpha7alpha12alpha26-tetraol + NAD+ (25R)-3alpha7alpha12alpha-trihydroxy-5beta-cholestan-26-al + NADH + H+Thus the two substrates of this enzyme are (25R)-5beta-cholestane-3alpha7alpha12alpha26-tetraol and NAD+ whereas its 3 products are (25R)-3alpha7alpha12alpha-trihydroxy-5beta-cholestan-26-al NADH and H+.This enzyme belongs to the family of oxidoreductases specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor.