N(6)-methyl-L-lysyl(4)-[histone H3] + S-adenosyl-L-homocysteine + H(+) => L-lysyl(4)-[histone H3] + S-adenosyl-L-methionine
n(6)-methyl-l-lysyl(4)-[histone h3] + s-adenosyl-l-homocysteine + h(+) => l-lysyl(4)-[histone h3] + s-adenosyl-l-methionine