Component of the global genome repair (GGR) complex which promotes global genome nucleotide excision repair (GG-NER) which removes DNA damage from nontranscribing DNA. Involved in differential repair of DNA after UV damage. Will repair preferentially the MAT-alpha locus compared with the HML-alpha locus. Component of the global genome repair (GGR) complex composed of at least ABF1, RAD7 and RAD16. Present with 358 molecules/cell in log phase SD medium. Belongs to the SNF2/RAD54 helicase family.