ATP-driven copper (Cu(+)) ion pump that plays an important role in intracellular copper ion homeostasis (PubMed:10419525, PubMed:11092760, PubMed:28389643). Within a catalytic cycle, acquires Cu(+) ion from donor protein on the cytoplasmic side of the membrane and delivers it to acceptor protein on the lumenal side. The transfer of Cu(+) ion across the membrane is coupled to ATP hydrolysis and is associated with a transient phosphorylation that shifts the pump conformation from inward-facing to outward-facing state (PubMed:10419525, PubMed:19453293, PubMed:19917612, PubMed:31283225, PubMed:28389643). Under physiological conditions, at low cytosolic copper concentration, it is localized at the trans-Golgi network (TGN) where it transfers Cu(+) ions to cuproenzymes of the secretory pathway (PubMed:28389643, PubMed:11092760). Upon elevated cytosolic copper concentrations, it relocalizes to the plasma membrane where it is responsible for the export of excess Cu(+) ions (PubMed:10419525, PubMed:28389643). May play a dual role in neuron function and survival by regulating cooper efflux and neuronal transmission at the synapse as well as by supplying Cu(+) ions to enzymes such as PAM, TYR and SOD3 (PubMed:28389643) (By similarity). In the melanosomes of pigmented cells, provides copper cofactor to TYR to form an active TYR holoenzyme for melanin biosynthesis (By similarity). ATP + Cu(+)(in) + H2O = ADP + Cu(+)(out) + H(+) + phosphate Monomer. Interacts with PDZD11 (PubMed:16051599). Interacts with ATOX1 and COMMD1 (PubMed:21667063, PubMed:19453293, PubMed:31283225). Interacts with TYRP1 (By similarity). Directly interacts with SOD3; this interaction is copper-dependent and is required for SOD3 activity. Cycles constitutively between the TGN and the plasma membrane (PubMed:9147644). Predominantly found in the TGN and relocalized to the plasma membrane in response to elevated copper levels. Targeting into melanosomes is regulated by BLOC-1 complex (By similarity). In response to glutamate, translocates to neuron processes with a minor fraction at extrasynaptic sites (By similarity). Widely expressed including in heart, brain, lung, muscle, kidney, pancreas, and to a lesser extent placenta (PubMed:8490646, PubMed:8490659). Expressed in fibroblasts, aortic smooth muscle cells, aortic endothelial cells and umbilical vein endothelial cells (at protein level) (PubMed:16371425). Expressed in cerebellum and brain cortex. The nucleotide-binding domain consists of a twisted six-stranded antiparallel beta-sheet flanked by two pairs of alpha-helices, forming an hydrophobic pocket that interacts with the adenine ring of ATP. The ATP binding site comprises residues located in alpha-1 and alpha-2 helices and beta-2 and beta-3 strands, which are involved in van der Waal's interactions, and Glu-1081 which forms an hydrogen bond with the adenine ring. The heavy-metal-associated domain (HMA) coordinates a Cu(+) ion via the cysteine residues within the CXXC motif. The transfer of Cu(+) ion from ATOX1 to ATP7A involves the formation of a three-coordinate Cu(+)-bridged heterodimer where the metal is shared between the two metal binding sites of ATOX1 and ATP7A. The Cu(+) ion appears to switch between two coordination modes, forming two links with one protein and one with the other. Cisplatin, a chemotherapeutic drug, can bind the CXXC motif and hinder the release of Cu(+) ion. Contains three di-leucine motifs in the C-terminus which are required for recycling from the plasma membrane to the TGN. The di-leucine 1487-Leu-Leu-1488 motif mediates endocytosis at the plasma membrane, whereas the di-leucine 1467-Leu-Leu-1468 motif is a sorting signal for retrograde trafficking to TGN via early endosomes. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry. Lacks 6 transmembrane regions and 5 heavy-metal-associated (HMA) domains. Lacks the transmembrane domains 3 and 4. Expressed at a low level in several tissues of normal individuals and is the only isoform found in patients with OHS. Lacks all transmembrane regions and 5 heavy-metal-associated (HMA) domains, but has a putative nuclear localization signal attached at the N-terminus. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IB subfamily. Heavy metal - Issue 79 of February 2007