Specifically methylates the cytosine at position 1407 (m5C1407) of 16S rRNA. cytidine(1407) in 16S rRNA + S-adenosyl-L-methionine = 5-methylcytidine(1407) in 16S rRNA + H(+) + S-adenosyl-L-homocysteine Belongs to the class I-like SAM-binding methyltransferase superfamily. RsmB/NOP family. Could be the product of a pseudogene. Truncated C-terminus. Truncated C-terminus.