Involved in DNA double-strand break (DSB) repair (PubMed:18957200). Acts probably with NurA to stimulate resection of the 5' strand and produce the long 3' single-strand that is required for RadA loading (PubMed:18957200). Exhibits DNA-dependent ATPase activity and DNA helicase activity (By similarity) (PubMed:18957200). ATP + H2O = ADP + H(+) + phosphate Helicase activity is stimulated in the presence of NurA. Homohexamer (PubMed:18957200). Interacts with NurA (PubMed:18957200). Belongs to the HerA family.