Involved in DNA double-strand break (DSB) repair (PubMed:22135300). Acts probably with NurA to stimulate resection of the 5' strand and produce the long 3' single-strand that is required for RadA loading (By similarity). Exhibits DNA-dependent ATPase activity and DNA helicase activity (PubMed:22135300, PubMed:25420454). ATP + H2O = ADP + H(+) + phosphate ATPase activity is stimulated in the presence of linear dsDNA (PubMed:22135300). Helicase activity requires the presence of NurA (PubMed:22135300). Homohexamer (PubMed:22135300, PubMed:25447518, PubMed:25420454). Forms a complex with NurA (PubMed:22135300, PubMed:25447518). Contains an N-terminal HAS-barrel domain, which mediates interaction with NurA, followed by a central RecA-like catalytic core and a C-terminal four-helix bundle. Belongs to the HerA family.