isoursodeoxycholate 7-beta-dehydrogenase (NAD+) activity
isoursodeoxycholate 7-beta-dehydrogenase (nad+) activity
Catalysis of the reaction: 3-beta,7-beta-dihydroxy-5-beta-cholan-24-oate + NAD+ = 3-beta-hydroxy-7-oxo-5-beta-cholan-24-oate + H+ + NADH.