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- W2021818819 abstract "The interaction between the (Na+ + K+)-ATPase and the adenylate cyclase enzyme systems was examined. Cyclic AMP, but not 5′-AMP, cyclic GMP or 5′-GMP, could inhibit the (Na+ + K+)-ATPase enzyme present in crude rat brain plasma membranes. On the other hand, the cyclic AMP inhibition could not be observed with purified preparations of (Na+ + K+)-ATPase enzyme. Rat brain synaptosomal membranes were prepared and treated with either NaCl or cyclic AMP plus NaCl as described by Corbin, J., Sugden, P., Lincoln, T. and Keely, S. ((1977) J. Biol. Chem. 252, 3854–3861). This resulted in the dissociation and removal of the catalytic subunit of a membrane-bound cyclic AMP-dependent protein kinase. The decrease in cyclic AMP-dependent protein kinase activity was accompanied by an increase in (Na+ + K+)-ATPase activity. Exposure of synaptosomal membranes containing the cyclic AMP-dependent protein kinase holoenzyme to a specific cyclic AMP-dependent protein kinase inhibitor resulted in an increase in (Na+ + K+)-ATPase enzyme activity. Synaptosomal membranes lacking the catalytic subunit of the cyclic-AMP-dependent protein kinase did not show this effect. Reconstitution of the solubilized membrane-bound cyclic AMP-dependent protein kinase, in the presence of a neuronal membrane substrate protein for the activated protein kinase, with a purified preparation of (Na+ + K+)-ATPase, resulted in a decrease in overall (Na+ + K+)-ATPase activity in the presence of cyclic AMP. Reconstitution of the protein kinase alone or the substrate protein alone, with the (Na+ + K+)-ATPase has no effect on (Na+ + K+)-ATPase activity in the absence or presence of cyclic AMP. Preliminary experiments indicate that, when the activated protein kinase and the substrate protein were reconstituted with the (Na+ + K+)-ATPase enzyme, there appeared to be a decrease in the Na+-dependent phosphorylation of the Na+-ATPase enzyme, while the K+-dependent dephosphorylation of the (Na+ + K+)-ATPase was unaffected." @default.
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- W2021818819 date "1982-06-01" @default.
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- W2021818819 title "Regulation of rat brain (Na+ + K+)-ATPase activity by cyclic AMP" @default.
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- W2021818819 doi "https://doi.org/10.1016/0005-2736(82)90359-5" @default.
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