protein methyltransferase activity arginine N-methyltransferase activity protein-arginine N-methyltransferase activity Reactome:R-HSA-191790 Reactome:R-HSA-5229010 Reactome:R-HSA-5205822 Reactome:R-HSA-5205867 Reactome:R-HSA-5205824 Reactome:R-HSA-5229203 Catalysis of the reaction: S-adenosyl-L-methionine + (protein)-arginine = S-adenosyl-L-homocysteine + (protein)-N-methyl-arginine. Reactome:R-HSA-5661126 Reactome:R-HSA-5205798 Reactome:R-HSA-5205820 PRMT activity GO:0016274 molecular_function Reactome:R-HSA-8879123 Reactome:R-HSA-8934735 Reactome:R-HSA-5218952