G9a Methyltransferase methylates lysine 9 (Lys 9) of histone H3. Methylation occurs at the e amino group of lysine residues. Methylation of histone H3 Lys 9 is a hallmark of silent chromatin and is globally distributed throughout the heterochromatic regions, such as centromere and telomere.
View G9a Methyltransferase on New England Biolabs’s website- G9a Methyltransferase