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Function and regulation of human copper-transporting ATPases Lutsenko S; Barnes NL; Bartee MY; Dmitriev OYPhysiol Rev 2007[Jul]; 87 (3): 1011-46Copper-transporting ATPases (Cu-ATPases) ATP7A and ATP7B are evolutionarily conserved polytopic membrane proteins with essential roles in human physiology. The Cu-ATPases are expressed in most tissues, and their transport activity is crucial for central nervous system development, liver function, connective tissue formation, and many other physiological processes. The loss of ATP7A or ATP7B function is associated with severe metabolic disorders, Menkes disease, and Wilson disease. In cells, the Cu-ATPases maintain intracellular copper concentration by transporting copper from the cytosol across cellular membranes. They also contribute to protein biosynthesis by delivering copper into the lumen of the secretory pathway where metal ion is incorporated into copper-dependent enzymes. The biosynthetic and homeostatic functions of Cu-ATPases are performed in different cell compartments; targeting to these compartments and the functional activity of Cu-ATPase are both regulated by copper. In recent years, significant progress has been made in understanding the structure, function, and regulation of these essential transporters. These studies raised many new questions related to specific physiological roles of Cu-ATPases in various tissues and complex mechanisms that control the Cu-ATPase function. This review summarizes current data on the structural organization and functional properties of ATP7A and ATP7B as well as their localization and functions in various tissues, and discusses the current models of regulated trafficking of human Cu-ATPases.|Adenosine Triphosphatases/genetics/*metabolism[MESH]|Cation Transport Proteins/genetics/*metabolism[MESH]|Copper-Transporting ATPases[MESH]|Gene Expression Regulation, Enzymologic[MESH]|Genomics[MESH]|Humans[MESH]|Protein Structure, Tertiary[MESH] |
