This family is a putative S-adenosyl-L-methionine (SAM)-dependent methyltransferase [1,2]. In eukaryotes it plays a role in mitochondrial complex I activity [2].

1: COMPASS server for remote homology inference. Sadreyev RI, Tang M, Kim BH, Grishin NV; Nucleic Acids Res. 2007;35:W653-W658. PMID:17517780

2: MidA is a putative methyltransferase that is required for mitochondrial complex I function. Carilla-Latorre S, Gallardo ME, Annesley SJ, Calvo-Garrido J, Grana O, Accari SL, Smith PK, Valencia A, Garesse R, Fisher PR, Escalante R; J Cell Sci. 2010;123:1674-1683. PMID:20406883