Involved in the maintenance of proper DNA topology and chromosome integrity via annealing of single-stranded DNA breaks. Modulates DNA polymerase delta during replication or replication-associated repair. May function as a modulator for SGS1 when DNA is damaged. Present with 1180 molecules/cell in log phase SD medium. Belongs to the AAA ATPase family. RarA/MGS1/WRNIP1 subfamily.