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. Forms a complex with SUVR1 and associates with the SNF2-related chromatin-remodeling proteins CHR19, CHR27, and CHR28, thereby mediating nucleosome positioning and transcriptional silencing. Does not possess histone-lysine methyltransferase activity in vitro, and the conserved catalytic sites of SUVR2 are dispensable for its function in transcriptional gene silencing. Interacts with SUVR1, CHR19, CHR28 and itself (PubMed:25420628). Interacts with CHR27 (PubMed:25420628, PubMed:25425661). Displays two nuclear localization patterns, one forming condensed foci and the other showing diffused signals. A number of isoforms are produced. According to EST sequences. 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.