Histone methyltransferase family member that may lack methyltransferase activity. May methylate 'Lys-9' of histone H3. H3 'Lys-9' methylation represents a specific tag for epigenetic transcriptional repression (Potential). Associates with centromeric constitutive heterochromatin. Although both SET and pre-SET domains are present, the absence of the post-SET domain may alter the methyltransferase activity. Belongs to the class V-like SAM-binding methyltransferase superfamily. Histone-lysine methyltransferase family. Suvar3-9 subfamily. The S-adenosyl-L-methionine binding sites are not conserved, suggesting that this protein lacks methyltransferase activity. Likewise, the zinc-binding Cys residues in the pre-SET domain are only partially conserved.