Recoupling the Na-K Pump
نویسندگان
چکیده
منابع مشابه
Characterization of the adipocyte ghost (Na+,K+) pump. Insights into the insulin regulation of the adipocyte (Na+,K+) pump.
The (Na+,K+) ATPase in plasma membranes isolated from rat adipocytes is insensitive to insulin (Lytton J., Lin, J.C., and Guidotti, G. (1985) J. Biol. Chem. 260, 1177-1184). For this reason, the characteristics of the (Na+,K+) pump in adipocyte ghosts, prepared by hypotonic lysis of adipocytes (Rodbell, M. (1967) J. Biol. Chem. 242, 5744-5750), were studied. Herein it is demonstrated that the (...
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Interactions of the three transported Na ions with the Na/K pump remain incompletely understood. Na/K pump crystal structures show that the extended C terminus of the Na,K-adenosine triphosphatase (ATPase) alpha subunit directly contacts transmembrane helices. Deletion of the last five residues (KETYY in almost all Na/K pumps) markedly lowered the apparent affinity for Na activation of pump pho...
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The Na and K dependence of the Na/K pump was measured in skin fibroblasts from patients with cystic fibrosis and age/sex-matched controls. Under basal conditions, there was no difference between control and cystic fibrosis cells in protein per cell, intracellular Na and K content, or Na/K pump activity (measured as ouabain-sensitive 86Rb uptake). There was no difference in the Na dependence of ...
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To determine the biochemical events of Na+ transport, we studied the interactions of Na+, Tris+, and K+ with the phosphorylated intermediates of Na,K-ATPase from ox brain. The enzyme was phosphorylated by incubation at 0 degrees C with 1 mM Mg2+, 25 microM [32P]ATP, and 20-600 mM Na+ with or without Tris+, and the dephosphorylation kinetics of [32P]EP were studied after addition of (1) 1 mM ATP...
متن کاملNa/Na exchange through the Na/K pump of HK sheep erythrocytes
Dear Sir : In their classic paper of 1960, Tosteson and Hoffman (13) provided the physiological basis for the HK/LK polymorphism of sheep erythrocytes (see Lauf (11 ] for a recent review). In their results, the function of the Na/K pump in HK sheep cells differed in one important respect from pumps in human red cells. Garrahan and Glynn (5) showed that human red cell pumps, in the absence of ex...
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ژورنال
عنوان ژورنال: Journal of Clinical Investigation
سال: 1972
ISSN: 0021-9738
DOI: 10.1172/jci107151