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.
GO:0033764
steroid dehydrogenase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor
is_a