label: rRNA pseudouridine synthase activity
label_lc: rrna pseudouridine synthase activity
description: "Catalysis of the reaction: a uridine in rRNA = a pseudouridine in rRNA. Conversion of uridine in an rRNA molecule to pseudouridine by rotation of the C1'-N-1 glycosidic bond of uridine in RNA to a C1'-C5."