This domain is found in Crossover junction endonuclease MUS81 from humans and similar animal proteins. MUS81 forms a complex with EME1 that functions as a endonuclease that maintains genomic integrity by cleaving branched DNA structures arising during the recombination. This entry represents the winged helix (WH) domain from MUS81, which shows a recognition helix and a beta-hairpin 'wing' motif and is responsible for DNA binding [1].

1: A winged helix domain in human MUS81 binds DNA and modulates the endonuclease activity of MUS81 complexes. Fadden AJ, Schalbetter S, Bowles M, Harris R, Lally J, Carr AM, McDonald NQ; Nucleic Acids Res. 2013;41:9741-9752. PMID:23982516