Catalysis of the addition of a second methyl group to methylated peptidyl-arginine. Methylation is on the terminal nitrogen (omega nitrogen) residue that is not already methylated, resulting in symmetrical peptidyl-N(omega),N'(omega)-dimethyled arginine residues.
Comment:
Note that type II protein arginine N-methyltransferase enzymes possess 'protein-arginine omega-N monomethyltransferase activity ; GO:0035241' and 'protein-arginine omega-N symmetric methyltransferase activity ; GO:0035243'.
Synonyms:
exact_synonym:
protein arginine omega-N symmetric methylase activity
related_synonym:
S-adenosyl-L-methionine:[protein]-L-arginine N-methyltransferase ([protein]-Nomega,Nomega'-dimethyl-L-arginine-forming); type II PRMT activity; type II protein arginine methyltransferase activity