Involved in copper import into the cell. May play a role in copper detoxification in roots. ATP + Cu(+)(in) + H2O = ADP + Cu(+)(out) + H(+) + phosphate Interacts with ATX1. Expressed in roots and flowers. By copper. No visible phenotype under normal growth conditions, but mutant plants are hypersensitive to copper excess. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IB subfamily.