rRNA (cytosine-N4-)-methyltransferase activity
Catalysis of the reaction: a cytidine in rRNA + S-adenosyl-L-methionine = an N(4)-methylcytidine in rRNA + H+ + S-adenosyl-L-homocysteine.
GO:0008170
N-methyltransferase activity
is_a
GO:0016434
rRNA (cytosine) methyltransferase activity
is_a