Reaction catalyzed by [histone H3]-lysine27 N-dimethyltransferase (2.1.1.371)
2
+
=
2
+
2 S-adenosyl-L-methionine
+
a [histone H3]-L-lysine27
=
2 S-adenosyl-L-homocysteine
+
a [histone H3]-N6,N6-dimethyl-L-lysine27
