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- W2088548696 abstract "3,5-Dibromo-1-acetoxy-4-oxo-2,5-cyclohexadien-1-acetonitrile (dienone A) inhibited Na+ - K+-ATPase with a half-maximal inhibition concentration (I50) equal to 2.9 X 10(-6)M. Inhibition was time- and pH-dependent and complete after 20-30 min preincubation within a range of pH from 7.0 to 9.0. Kinetic evaluation of the cationic substrate activation of Na+ - K+-ATPase indicated mixed type inhibition with regard to Na+ and K+ and competitive inhibition with regard to ATP activation of the enzyme. The presence of Mg2+ caused an increased inhibition. Also, K+-p-nitrophenyl phosphatase activity was altered by dienone A and mixed type inhibition with regard to p-nitrophenyl phosphate and K+ was demonstrated. Inhibition was partially restored by repeated washing. Preincubation with sulfhydryl reagents protected the enzyme from inhibition. A significant linear correlation between reactive enzyme sulfhydryl contents [SH] and Na+ - K+-ATPase activity in the presence of varying concentrations of dienone A was observed. One of the factors causing cytotoxic activity of this compound might be its interaction with some thiol groups of the membrane-bound Na+ - K+-ATPase." @default.
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- W2088548696 title "Inhibitory characteristics of 3,5-dibromo-1-acetoxy-4-oxo-2,5-cyclohexadien-1-acetonitrile, a semisynthetic derivative of aeroplysinin-1 from sponges (Aplysinidae), on Na+ - K+-ATPase" @default.
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- W2088548696 doi "https://doi.org/10.1016/0041-0101(84)90088-6" @default.
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