The bifunctional enzyme from Mycobacterium tuberculosis 2′-O-methylates cytidine1920 in helix 69 of 23S rRNA and cytidine1409 in helix 44 of 16S rRNA (cf. EC 2.1.1.227, 16S rRNA (cytidine1409-2′-O)-methyltransferase). These methylations result in increased susceptibility to the antibiotics capreomycin and viomycin.
Cofactor
History
Reactions
S-adenosyl-L-methionine + cytidine(1920) in 23S rRNA = S-adenosyl-L- homocysteine + 2′-O-methylcytidine(1920) in 23S rRNA.