Cellular multitasking: the dual role of human Cu-ATPases in cofactor delivery and intracellular copper balance.
The human copper-transporting ATPases (Cu-ATPases) are essential for dietary copper uptake, normal development and function of the CNS, and regulation of copper homeostasis in the body. In a cell, Cu-ATPases maintain the intracellular concentration of copper by transporting copper into intracellular exocytic vesicles. In addition, these P-type ATPases mediate delivery of copper to copper-dependent enzymes in the secretory pathway and in specialized cell compartments such as secretory granules or melanosomes. The multiple functions of human Cu-ATPase necessitate complex regulation of these transporters that is mediated through the presence of regulatory domains in their structure, posttranslational modification and intracellular trafficking, as well as interactions with the copper chaperone Atox1 and other regulatory molecules. In this review, we summarize the current information on the function and regulatory mechanisms acting on human Cu-ATPases ATP7A and ATP7B. Brief comparison with the Cu-ATPase orthologs from other species is included.
Department of Biochemistry and Molecular Biology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L224, Portland, OR 97239-3098, USA. lutsenko@ohsu.edu
Svetlana
S
Lutsenko
Arnab
A
Gupta
Jason L
JL
Burkhead
Vesna
V
Zuzel
D000251:Adenosine Triphosphatases / Q000737:chemistry / Q000502:physiology*; D000818:Animals; D027682:Cation Transport Proteins / Q000737:chemistry / Q000502:physiology*; D003300:Copper / Q000378:metabolism*; D000073840:Copper-Transporting ATPases; D003593:Cytoplasm / Q000502:physiology*; D005656:Fungal Proteins / Q000737:chemistry / Q000502:physiology; D006801:Humans; D042541:Intracellular Space / Q000378:metabolism; D017136:Ion Transport; D010802:Phylogeny; D010940:Plant Proteins / Q000737:chemistry / Q000502:physiology; D011487:Protein Conformation
D027682:Cation Transport Proteins; D005656:Fungal Proteins; D010940:Plant Proteins; D003300:Copper; D000251:Adenosine Triphosphatases; D000073840:Copper-Transporting ATPases