Could be an ATP-dependent permease. Confers hyper-resistance to the mutagens 4-nitroquinoline-N-oxide (4-NQO) and triaziquone, as well as to the chemicals sulphomethuron methyl phenanthroline when present in multiple copies. Exhibits nucleoside triphosphatase activity. Present with 1300 molecules/cell in log phase SD medium. Belongs to the ABC transporter superfamily. ABCG family. PDR (TC 3.A.1.205) subfamily.