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- W1577573797 abstract "In view of the striking homology among various ion-translocating ATPases including Na,K-ATPase, Ca-ATPase, and H,K-ATPase, and the recent evidence that protons can replace cytoplasmic sodium as well as potassium in the reaction mechanism of the Na,K-ATPase (Polvani, C., and Blostein, R. (1988) J. Biol. Chem. 263, 16757-16763), we studied the role of sodium as a substitute for protons in the H,K-ATPase reaction. Using hog gastric H,K-ATPase-rich inside-out membrane vesicles we observed 22Na+ influx which was stimulated by intravesicular potassium ions (K+i) at pH 8.5 but not at pH 7.1. This sodium influx was observed in medium containing ATP and was inhibited by vanadate and SCH28080, a selective inhibitor of the gastric H,K-ATPase. At least 2-fold accumulation of sodium was observed at pH 8.5. Experiments aimed to determine the sidedness of the alkaline pH requirement for K+i-dependent sodium influx showed that K+i-activated sodium influx depends on pHout and is unaffected by changes in pHin. These results support the conclusion that sodium ions substitute for protons in the H,K-ATPase reaction mechanism and provide evidence for a similarity in ion selectivity and/or binding domains of the Na,K-ATPase and the gastric H,K-ATPase enzymes." @default.
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- W1577573797 date "1989-10-01" @default.
- W1577573797 modified "2023-09-28" @default.
- W1577573797 title "Sodium ions as substitutes for protons in the gastric H,K-ATPase" @default.
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- W1577573797 doi "https://doi.org/10.1016/s0021-9258(19)84651-3" @default.
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