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- W2094626267 abstract "The effects of Mg2+ and nucleotides on the dephosphorylation process of the (K+ + H+)-ATPase phosphoenzyme have been studied. Phosphorylation with [gamma-32P]ATP is stopped either by addition of non-radioactive ATP or by complexing of Mg2+ with EDTA. The dephosphorylation process is slow and monoexponential when dephosphorylation is initiated with ATP. When phosphorylation is stopped by complexing of Mg2+ the dephosphorylation process is fast and biexponential. The discrepancy could be explained by a nucleotide mediated inhibition of the dephosphorylation process. The I0.5 for ATP for this inhibition is 0.1 mM and that for ADP is 0.7 mM, suggesting that a low-affinity binding site is involved. When Mg2+ is present in millimolar concentrations in addition to the nucleotides the dephosphorylation process is enhanced. Evidence has been obtained that Mg2+ acts through lowering the affinity for ATP. In contrast to K+, Mg2+ does not stimulate dephosphorylation in the absence of nucleotides. Mg2+ and nucleotides show the same interaction in the dephosphorylation process of a phosphoenzyme generated from inorganic phosphate. These findings suggest the presence of a low-affinity nucleotide binding site on the phosphoenzyme, as is found in the (Na+ + K+)-ATPase phosphoenzyme. This low-affinity binding site may function as a feed-back mechanism in proton transport." @default.
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- W2094626267 date "1986-09-01" @default.
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- W2094626267 title "Presence of a low-affinity nucleotide binding site on the (K+ + H+)-ATPase phosphoenzyme" @default.
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- W2094626267 doi "https://doi.org/10.1016/0005-2736(86)90564-x" @default.
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