Immunogen sequence: FKNLGIEAVP WTADIPLKVV GMFPSRGEKR ALWKLAYDLY SCTSIYKFGR IEVNMFIGEK EFQKLMADPG NPDLYHVLSV IWQLACEIK. S-adenosyl-L-methionine-dependent methyltransferase which specifically dimethylates mitochondrial 12S rRNA at the conserved stem loop.