label: histone H4 methyltransferase activity
label_lc: histone h4 methyltransferase activity
description: "Catalysis of the reaction: Catalysis of the reaction: S-adenosyl-L-methionine + a histone H4 = S-adenosyl-L-homocysteine + a methylated histone H4. Histone methylation generally occurs on either an arginine or a lysine residue."