16S rRNA (cytosine<sup>1402</sup>-N<sup>4</sup>)-methyltransferase (, RsmH, MraW) is an enzyme with systematic name S-adenosyl-L-methionine:16S rRNA (cytosine1402-N4)-methyltransferase. This enzyme catalyses the following chemical reaction
RsmH catalyses the N<sup>4</sup>-methylation of cytosine<sup>1402</sup>.