This is the C-terminal domain found in PvuRts1I, a modification-dependent restriction endonuclease that recognizes 5-hydroxymethylcytosine (5hmC) as well as 5-glucosylhydroxymethylcytosine (5ghmC) in double-stranded DNA in bacteria. Structural analysis indicates that it has the typical SRA (SET and RING associated) domain fold (Pfam:PF02182) [1].

1: Structure of 5-hydroxymethylcytosine-specific restriction enzyme, AbaSI, in complex with DNA. Horton JR, Borgaro JG, Griggs RM, Quimby A, Guan S, Zhang X, Wilson GG, Zheng Y, Zhu Z, Cheng X; Nucleic Acids Res. 2014;42:7947-7959. PMID:24895434

2: Crystal structure of the 5hmC specific endonuclease PvuRts1I. Kazrani AA, Kowalska M, Czapinska H, Bochtler M; Nucleic Acids Res. 2014;42:5929-5936. PMID:24634440