This domain is a family of nucleases. The family includes EME1 which is an essential component of a Holliday junction resolvase [2-3]. EME1 interacts with MUS81 to form a DNA structure-specific endonuclease.

1: The endogenous Mus81-Eme1 complex resolves Holliday junctions by a nick and counternick mechanism. Gaillard PH, Noguchi E, Shanahan P, Russell P; Mol Cell. 2003;12:747-759. PMID:14527419

2: Mus81-Eme1 are essential components of a Holliday junction resolvase. Boddy MN, Gaillard PH, McDonald WH, Shanahan P, Yates JR 3rd, Russell P; Cell. 2001;107:537-548. PMID:11719193

3: Sequence, structure and functional diversity of PD-(D/E)XK phosphodiesterase superfamily. Steczkiewicz K, Muszewska A, Knizewski L, Rychlewski L, Ginalski K; Nucleic Acids Res. 2012;40:7016-7045. PMID:22638584