Probable helicase, member of the UBC2/RAD6 epistasis group. Functions with DNA repair protein rad18 in error-free postreplication DNA repair. Involved in the maintenance of wild-type rates of instability of simple repetitive sequences such as poly(GT) repeats (By similarity). Plays a role in surviving topoisomerase-mediated DNA damage (PubMed:14871939). Belongs to the SNF2/RAD54 helicase family.