. "The bifunctional enzyme from Mycobacterium tuberculosis 2'-O-methylates cytidine(1920) in helix 69 of 23S rRNA and cytidine(1409) in helix 44 of 16S rRNA (cf. EC 2.1.1.227)." . "These methylations result in increased susceptibility to the antibiotics capreomycin and viomycin." . . . "23S rRNA (cytidine(1920)-2'-O)-methyltransferase" . "S-adenosyl-L-methionine + cytidine(1920) in 23S rRNA = S-adenosyl-L-homocysteine + 2'-O-methylcytidine(1920) in 23S rRNA." .