Catalyzes the synthesis of dihydrouridine, a modified base found in the D-loop of most tRNAs (By similarity). MTHSCRLSVAPMLDWTDRHCRYFHRLLSAQTLLYTEMVTTGAIIHGRGDFLAYNQEEHPVALQFGGSNPKDLAHCAKLAQERGYDEINLNVGCPSDRVQNGRFGACLMGEPDLVAECVAAMRAVVDIPVTVKTRIGIDDQDSYEFLTQFIATVAEKGGCEQFTIHARKAWLSGLSPKENREIPPLDYPRAYQIKRDFPHLTIAVNGGVKSLEEAKLHLQHLDGVMIGREAYQNPYLLAEVDQQIFGLETPVKKRSQVIHEMMPYIERELSQGTHLGHMTRHMLGLFQNMPGARQWRRHISENAHKPGAGLEVVEQALAKIPYQELGV tRNA-dihydrouridine synthase A 327 VC_0379 dusA DUSA_VIBCH