Metal efflux transporter that may play a role in detoxification of heavy metals, such as zinc, copper, lead and cadmium, especially in the shoots. Expressed in root vascular cylinder, vascular bundles and mesophyll cells of leaf blades, and anther walls and microspores of stamens. Induced by high concentrations of copper, zinc and cadmium. No visible phenotype under normal growth conditions, but mutant plants exhibit increased sensitivity to elevated levels of zinc, copper, lead, and to a lesser extent cadmium. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IB subfamily.