tRNA (cytidine) methyltransferase activity tRNA (cytidine-N3)-methyltransferase activity https://github.com/geneontology/go-ontology/issues/25722 https://github.com/geneontology/go-ontology/issues/26109 https://github.com/geneontology/go-ontology/issues/30193 transfer ribonucleate cytosine 3-methyltransferase activity tRNA (cytidine-3-)-methyltransferase activity RHEA:50956 tRNA (cytosine-3-)-methyltransferase activity RHEA:50960 RHEA:60908 GO:0052735 tRNA (cytosine 3)-methyltransferase activity S-adenosyl-L-methionine:tRNA cytosine-3-methyltransferase activity S-adenosyl-L-methionine:tRNA (cytosine-3-)-methyltransferase activity tRNA cytosine-3-methyltransferase activity tRNA cytosine 3-methyltransferase activity RHEA:60912 Catalysis of the reaction: a cytidine in tRNA + S-adenosyl-L-methionine = an N3-methylcytidine in tRNA + H+ + S-adenosyl-L-homocysteine. molecular_function