Catalyzes the synthesis of dihydrouridine, a modified base, in various RNAs, such as tRNAs, mRNAs and some long non-coding RNAs (lncRNAs) (PubMed:34556860). Mainly modifies the uridine in position 47 (U47) in the D-loop of most cytoplasmic tRNAs (PubMed:34556860). Also able to mediate the formation of dihydrouridine in some mRNAs, thereby regulating their translation (PubMed:34556860).
