This family is a S-adenosyl-L-methionine (SAM)-dependent methyltransferase. It is often found in association with Pfam:PF01266, where it is responsible for catalysing the transfer of a methyl group from S-adenosyl-L-methionine to 5-aminomethyl-2-thiouridine to form 5-methylaminomethyl-2-thiouridine [1,2].

1: Identification of a bifunctional enzyme MnmC involved in the biosynthesis of a hypermodified uridine in the wobble position of tRNA. Bujnicki JM, Oudjama Y, Roovers M, Owczarek S, Caillet J, Droogmans L; RNA. 2004;10:1236-1242. PMID:15247431

2: Sequence-structure-function analysis of the bifunctional enzyme MnmC that catalyses the last two steps in the biosynthesis of hypermodified nucleoside mnm5s2U in tRNA. Roovers M, Oudjama Y, Kaminska KH, Purta E, Caillet J, Droogmans L, Bujnicki JM; Proteins. 2008;71:2076-2085. PMID:18186482