The RuvA-RuvB complex in the presence of ATP renatures cruciform structure in supercoiled DNA with palindromic sequence, indicating that it may promote strand exchange reactions in homologous recombination. RuvAB is a helicase that mediates the Holliday junction migration by localized denaturation and reannealing (By similarity). Stimulates the resolution of Holliday junctions by RecU. ATP + H2O = ADP + H(+) + phosphate Forms a complex with RuvA (By similarity). Homohexamer which interacts with RecU. Belongs to the RuvB family.