Involved in copper export. ATP + Cu(+)(in) + H2O = ADP + Cu(+)(out) + H(+) + phosphate Monomer at sub-stoichiometric copper concentrations. Homodimer at higher copper concentrations. Forms a heterodimer (electrostatic interactions) with CopZ during the transfer of Cu(+). By Cu(2+). The copZA operon is activated by CueR and indirectly repressed by YfmP. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IB subfamily.