3-Alpha,7-Alpha,12-Alpha-Trihydroxycholestan-26-Al 26-Oxidoreductase Activity

3alpha,7alpha,12alpha-Trihydroxycholestan-26-Al 26-Dehydrogenase Activity

Catalysis of the reaction: H2O + NAD+ + 3-alpha,7-alpha,12-alpha-trihydroxy-5-beta-cholestan-26-al = NADH + 3-alpha,7-alpha,12-alpha-trihydroxy-5-beta-cholestanate.