Probable inactive histone-lysine methyltransferase that acts as regulator of transctiptional gene silencing independently of histone H3K9 methylation. Contributes to transcriptional gene silencing at RNA-directed DNA methylation (RdDM) target loci but also at RdDM-independent target loci. Interacts with SUVR2 and itself. In the pre-SET domain, Cys residues bind 3 zinc ions that are arranged in a triangular cluster; some of these Cys residues contribute to the binding of two zinc ions within the cluster. Belongs to the class V-like SAM-binding methyltransferase superfamily. Histone-lysine methyltransferase family. Truncated N-terminus.