RNA methyltransferases modify nucleotides during ribosomal RNA maturation in a site-specific manner. The Escherichia coli member is specific for U1498 methylation [1][2].

1: SPOUT: a class of methyltransferases that includes spoU and trmD RNA methylase superfamilies, and novel superfamilies of predicted prokaryotic RNA methylases. Anantharaman V, Koonin EV, Aravind L; J Mol Microbiol Biotechnol. 2002;4:71-75. PMID:11763972

2: Identification and characterization of RsmE, the founding member of a new RNA base methyltransferase family. Basturea GN, Rudd KE, Deutscher MP; RNA. 2006;12:426-434. PMID:16431987