label: histone H3K27 monomethyltransferase activity
label_lc: histone h3k27 monomethyltransferase activity
description: "Catalysis of the reaction: L-lysyl27-[histone H3] + S-adenosyl-L-methionine = H+ + N6-methyl-L-lysyl27-[histone H3] + S-adenosyl-L-homocysteine. This reaction is the addition of a single methyl group to the unmethylated lysine residue at position 27 of histone H3, producing histone H3K27me."