IUBMB Enzyme Nomenclature


Accepted name: 16S rRNA (cytidine1402-2'-O)-methyltransferase

Reaction: S-adenosyl-L-methionine + cytidine1402 in 16S rRNA = S-adenosyl-L-homocysteine + 2'-O-methylcytidine1402 in 16S rRNA

Other name(s): RsmI; YraL

Systematic name: S-adenosyl-L-methionine:16S rRNA (cytidine1402-2'-O)-methyltransferase

Comments: RsmI catalyses the 2'-O-methylation of cytidine1402 and RsmH (EC catalyses the N4-methylation of cytidine1402 in 16S rRNA. Both methylations are necessary for efficient translation initiation at the UUG and GUG codons.

Links to other databases: BRENDA, EXPASY, KEGG, PDB, Metacyc, CAS registry number:


1. Kimura, S. and Suzuki, T. Fine-tuning of the ribosomal decoding center by conserved methyl-modifications in the Escherichia coli 16S rRNA. Nucleic Acids Res. 38 (2010) 1341-1352. [PMID: 19965768]

[EC created 2010]

Return to EC 2.1.1 home page
Return to EC 2.1 home page
Return to EC 2 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page