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  • Title: [Na+, K+ -ATPase: causes of activation of K+ -phosphatase reaction by nucleotides].
    Author: Svinukhova IA.
    Journal: Ukr Biokhim Zh (1978); 1983; 55(4):386-91. PubMed ID: 6137891.
    Abstract:
    Hydrolysis of umbelliferone phosphate is inhibited by sodium ions and ATP added to the incubation medium together with Na+ activates it, CTP, ITP, UTP and GTP produce the same effect. Acetyl phosphate, p-nitrophenyl phosphate, ADP and adenylyl imidodiphosphate beta, gamma-NH-ATP, ATP nonhydrolyzable analog, have no activating effect. ATP produces a mixed inhibition of umbelliferone phosphate hydrolysis both in the presence and absence of Na+. A scheme is suggested which explains the mechanism of the nucleotide activating effect.
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