Histone-arginine N-methyltransferase (, histone protein methylase I, nuclear protein (histone) N-methyltransferase, protein methylase I, S-adenosyl-L-methionine:histone-arginine omega-N-methyltransferase) is an enzyme with systematic name S-adenosyl-L-methionine:histone-arginine Nomega-methyltransferase. This enzyme catalyses the following chemical reaction S-adenosyl-L-methionine + histone-arginine S-adenosyl-L-homocysteine + histone-Nomega-methyl-arginine The enzyme forms the Nomega-monomethyl- and Nomega,Nomega'-dimethyl. References External links EC 2.1.1