first Tudor domain found in SET domain bifurcated 1 (SETDB1) and similar proteins
SETDB1, also called ERG-associated protein with SET domain (ESET), histone H3-K9 methyltransferase 4, H3-K9-HMTase 4, or lysine N-methyltransferase 1E (KMT1E), acts as a histone-lysine N-methyltransferase that specifically trimethylates 'Lys-9' of histone H3 (H3K9me3). It mainly functions in euchromatin regions, thereby playing a central role in the silencing of euchromatic genes. It contains two Tudor domains. This model corresponds to the first one. The Tudor domain binds to proteins with dimethylated arginine or lysine residues, and may also bind methylated histone tails to facilitate protein-protein interactions.