2.1.1.198 S-adenosyl-L-methionine + cytidine1402 in 16S rRNA the enzyme recognizes the 30S subunit as a substrate, but not the naked 16S rRNA or the tightly-coupled 70S ribosome 407339 2.1.1.198 S-adenosyl-L-methionine + cytidine1402 in 16S rRNA - 432936