Protein arginine methyltransferases (PRMTs) play a crucial role in a variety of biological processes. PRMTs divide into three categories. Firstly, type I PRMTs catalyzes mono- and asymmetric dimethylation of arginine residues. Secondly, type II PRMTs catalyzes mono- and symmetric dimethylation of arginine residues. Finally, type III PRMT catalyzes only...