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- W2018693566 abstract "Fusion proteins of glutathione-S-transferase and fragments from the large cytoplasmic domain of the sheep Na,K-ATPase alpha1-subunit were expressed in Escherichia coli. The Na,K-ATPase sequences begin at Ala345 and terminate at either Arg600 (DP600f), Thr610 (DP610f), Gly731 (DP731f), or Glu779 (DP779f). After affinity purification on glutathione-Sepharose, the fusion proteins were labeled with [alpha-32P]-2-N3-ATP, and incorporation of the radiolabel into the fusion proteins was measured by scintillation counting after sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Kd values of 220-290 microM for 2-N3-ATP binding to the fusion proteins were obtained from the photolabeling experiments. Approximately 1 mol of 2-N3-ATP was calculated to be incorporated per mole of fusion protein after correction for photochemical incorporation efficiency. Labeling of all of the fusion proteins by 25 microM 2-N3-ATP was reduced in the presence of MgATP, Na2ATP, MgCl2, 2',3'-O-(2,4, 6-trinitrophenyl)-ATP, and p-nitrophenylphosphate, and Ki values of 2-11 mM for Na2ATP, 0.2-5 mM for MgCl2, 0.1-5 mM for MgATP, and 20-300 microM for p-nitrophenylphosphate were calculated for these ligands. All of the fusion proteins catalyze the hydrolysis of p-nitrophenylphosphate. The reaction requires MgCl2 and is inhibited by inorganic phosphate, which is similar to the hydrolysis of p-nitrophenylphosphate by native Na,K-ATPase. Based on these observations, it appears that the soluble fragments from the large cytoplasmic domain of Na,K-ATPase expressed in bacterial cells are folded in an E2-like conformation and are likely to retain much of the native structure." @default.
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- W2018693566 date "1999-07-01" @default.
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- W2018693566 title "Catalytic Activity of an Isolated Domain of Na,K-ATPase Expressed in Escherichia coli" @default.
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- W2018693566 doi "https://doi.org/10.1016/s0006-3495(99)76887-6" @default.
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