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• W2023148968 abstract "A rat liver plasma membrane fraction showed an ATP-dependent uptake of Ca2+ which was released by the ionophore A23187. This activity represents a plasma membrane component and is not due to microsomal contamination. The Ca2+ transport displayed several properties which were different from those of the high-affinity Ca2+-ATPase previously observed in these membranes (Lotersztajn et al. (1981) J. Biol. Chem. 256, 11209-11215; Birch-Machin, M.A. and Dawson, A.P. (1986) Biochim. Biophys. Acta 855, 277-285). These observations have shown that Ca2+-ATPase does not require added Mg2+ whereas we have demonstrated that, in the same membrane preparation, Ca2+ uptake required millimolar concentrations of added Mg2+. The Ca2+-ATPase has a broad specificity for the nucleotides ATP, GTP, UTP and ITP while Ca2+ uptake remains specific for ATP. Ca2+ uptake also displayed different affinities for free Ca2+ and MgATP compared to Ca2+-ATPase activity, with apparent Km values of 0.25 microM Ca2+, 0.15 mM MgATP and 1.0 microM Ca2+, 4 microM MgATP respectively. The apparent maximum rate of Ca2+ uptake was about 150-fold less than Ca2+-ATPase activity. These features suggest that the high-affinity Ca2+-ATPase is not the enzymic expression of the ATP-dependent Ca2+ transport mechanism." @default.
• W2023148968 created "2016-06-24" @default.
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• W2023148968 date "1988-10-01" @default.
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• W2023148968 title "Ca2+ transport by rat liver plasma membranes: the transporter and the previously reported Ca2+-ATPase are different enzymes" @default.
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• W2023148968 doi "https://doi.org/10.1016/0005-2736(88)90445-2" @default.
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