Plays an essential role in homologous recombination (HR) which is a major pathway for repairing DNA double-strand breaks (DSBs), single-stranded DNA (ssDNA) gaps, and stalled or collapsed replication forks (PubMed:30961891). Acts as a molecular motor during the homology search and guides RAD51 ssDNA along a donor dsDNA thereby changing the homology search from the diffusion-based mechanism to a motor-guided mechanism. Also plays an essential role in RAD51-mediated synaptic complex formation which consists of three strands encased in a protein filament formed once homology is recognized. Once DNA strand exchange occured, dissociates RAD51 from nucleoprotein filaments formed on dsDNA (By similarity). ATP + H2O = ADP + H(+) + phosphate Homohexamer (PubMed:30961891). Interacts with RAD51 (PubMed:30961891). Phosphorylated. Phosphorylations at Ser-566 and Ser-567 allow efficient removal of RAD51 filaments from DNA.