10">Protein arginine methyltransferases (PRMTs) methylate protein arginyl groups.
15">PRMT substrates of nine mammalian isoforms show no consensus sequence.
PRMTs can form monomethyl-, asymmetric dimethyl- or symmetric dimethylarginine.
Biological function is dependent upon specific product formation.
Processivity, regulators and posttranslational modifications control activity.