Abstract
The energy dependent exchange of cytoplasmic Na+ for extracellular K+ in mammalian cells is due to a membrane bound enzyme system, the Na,K-ATPase. The exchange sustains a gradient for Na+ into and for K+ out of the cell, and this is used as an energy source for creation of the membrane potential, for its de- and repolarisation, for regulation of cytoplasmic ionic composition and for transepithelial transport. The Na,K-ATPase consists of two membrane spanning polypeptides, an α-subunit of 112-kD and a β-subunit, which is a glycoprotein of 35-kD. The catalytic properties are associated with the α-subunit, which has the binding domain for ATP and the cations. In the review, attention will be given to the biochemical characterization of the reaction mechanism underlying the coupling between hydrolysis of the substate ATP and transport of Na+ and K+.
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Skou, J.C., Esmann, M. The Na,K-ATPase. J Bioenerg Biomembr 24, 249–261 (1992). https://doi.org/10.1007/BF00768846
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DOI: https://doi.org/10.1007/BF00768846