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- W2012435981 abstract "The effects of detergents and free fatty acids on the K(+)-activated ATPase activity and on the steady-state phosphorylation level of pig gastric H,K-ATPase were studied. Unsaturated free fatty acids inhibited the K(+)-activated ATPase activity, due to inactivation of the enzyme (long-term effects) and to a decrease in the K(+)-sensitive dephosphorylation rate (short-term effects). The degree of inhibition depended on the reaction conditions: the protein concentration, the temperature and the ligands used. No effect was observed when saturated- or methylated unsaturated fatty acids were tested. Free fatty acids and the detergent C12E8 increased the steady-state ATP phosphorylation level, indicating the presence of vesicular structures in the H,K-ATPase preparations. At higher concentrations these compounds inactivated H,K-ATPase, which was measured as a decrease in phosphorylation capacity. By combining the data from the ATP phosphorylation level in the absence and presence of C12E8 (without inactivation) and the data from the K(+)-activated ATPase activity with and without ionophore the tightness of vesicular preparations and the orientation of H,K-ATPase was determined. A rather simple method for the isolation of H,K-ATPase is reported, which yields highly purified H,K-ATPase preparations with a ATP phosphorylation capacity of 3.9 nmol P per mg protein or 0.57 mol P per mol alpha beta protomer. This number suggests that each alpha-subunit H,K-ATPase can be phosphorylated at the same time." @default.
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- W2012435981 date "1991-12-01" @default.
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- W2012435981 title "Effect of free fatty acids and detergents on H,K-ATPase. The steady-state ATP phosphorylation level and the orientation of the enzyme in membrane preparations" @default.
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- W2012435981 doi "https://doi.org/10.1016/0005-2736(91)90068-j" @default.
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