This family includes uncharacterised archaebacterial proteins. Sequence and structure analysis to identify RNase H-like superfamily members, has clustered this family in endonuclease Clade V, thus suggesting endonuclease activity of these proteins [1].

1: The RNase H-like superfamily: new members, comparative structural analysis and evolutionary classification. Majorek KA, Dunin-Horkawicz S, Steczkiewicz K, Muszewska A, Nowotny M, Ginalski K, Bujnicki JM; Nucleic Acids Res. 2014;42:4160-4179. PMID:24464998