DNA helicase that possesses intrinsic ATP-dependent nucleosome-remodeling activity and is both required for DNA repair and heterochromatin organization. Promotes DNA end resection of double-strand breaks (DSBs) following DNA damage: probably acts by weakening histone DNA interactions in nucleosomes flanking DSBs (By similarity). ATP + H2O = ADP + H(+) + phosphate Belongs to the SNF2/RAD54 helicase family. Probable cloning artifact.