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- W2000268853 abstract "The sarcoplasmic reticulum Ca2+-ATPase was reacted with vanadate in the presence of Mg2+ and EGTA, and the effect of Ca2+, Mg2+ and ATP on the kinetics of vanadate release from the enzyme vanadate complex was studied after dilution with vanadate-free media. Ca2+ increased, whereas ATP decreased the rate of vanadate release. In absence of free Mg2+ in the release media ATP was bound to the vanadate-reacted Ca2+-ATPase with high affinity (Kd 4-5 microM), and full saturation with ATP resulted in complete inhibition of vanadate release. In media containing free Mg2+, where ATP predominantly was present as MgATP, binding of the nucleotide to vanadate-reacted Ca2+-ATPase occurred with low apparent affinity. Mg2+ alone did not affect the rate of vanadate release. At saturating ATP concentrations the release rate in the presence of free Mg2+ was less inhibited than in its absence. These results indicate that uncomplexed ATP interacts with the same Mg2+ at the catalytic site, which is involved in formation of the enzyme-vanadate complex (EMgV), and thereby hinders dissociation of vanadate. Destabilization of the complex by free Mg2+ may be caused by the presence of an additional magnesium ion in the catalytic site together with ATP." @default.
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- W2000268853 date "1985-04-01" @default.
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- W2000268853 title "The role of Mg2+ and Ca2+ in the simultaneous binding of vanadate and ATP at the phosphorylation site of sarcoplasmic reticulum Ca2+-ATPase" @default.
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- W2000268853 doi "https://doi.org/10.1016/0005-2736(85)90467-5" @default.
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