EME1 and MUS81 form a complex that acts as a structure-specific endonuclease, playing an important role in rescuing stalled replication forks and resolving the meiotic recombination intermediates in eukaryotes [1,2]. Both consist of a central nuclease domain (Pfam:PF02732), two repeats of the helix-hairpin-helix (HhH) motif and a linker helix. This entry represents the C-terminal HhH domain of EME1 and MUS81 [1,2]. Similar to EME1-MUS81, human MUS81-EME2 cleaves 3'-flaps, replication forks and nicked Holliday junctions, and exhibits limited endonuclease activity with intact Holliday junctions.

1: Crystal structure of the Mus81-Eme1 complex. Chang JH, Kim JJ, Choi JM, Lee JH, Cho Y; Genes Dev. 2008;22:1093-1106. PMID:18413719

2: Crystal structures of the structure-selective nuclease Mus81-Eme1 bound to flap DNA substrates. Gwon GH, Jo A, Baek K, Jin KS, Fu Y, Lee JB, Kim Y, Cho Y; EMBO J. 2014;33:1061-1072. PMID:24733841

3: Human MUS81-EME2 can cleave a variety of DNA structures including intact Holliday junction and nicked duplex. Amangyeld T, Shin YK, Lee M, Kwon B, Seo YS; Nucleic Acids Res. 2014;42:5846-5862. PMID:24692662