This domain is part of a cytosine specific DNA methyltransferase enzyme. It functions non-catalytically to target the protein towards replication foci. This allows the DNMT1 protein to methylate the correct residues. This domain targets DMAP1 and HDAC2 to the replication foci during the S phase of mitosis. They are thought to have some importance in conversion of critical histone lysine moieties. [1]

1: DNMT1 binds HDAC2 and a new co-repressor, DMAP1, to form a complex at replication foci. Rountree MR, Bachman KE, Baylin SB; Nat Genet 2000;25:269-277. PMID:10888872