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• W2024939971 endingPage "776" @default.
• W2024939971 startingPage "770" @default.
• W2024939971 abstract "The hydrolysis of diadenosine 5',5'-triphosphate to AMP and ADP has been studied over a wide pH-range. Under acidic conditions the reaction shows a first-order dependence on the hydronium ion concentration. Below pH 3 the rate-increase begins to level off. From pH 6 to 9 the hydrolysis is slow and pH-independent. Base-catalysed hydrolysis is observed in NaOH-solutions. Under alkaline conditions an intramolecular nucleophilic attack on the phosphate producing 3',5'-cAMP is also observed, but it is slower than the intermolecular reaction. Depurination of the adenosine moieties competes with the hydrolysis both under acidic and alkaline conditions, but the mechanisms are different. The temperature-dependence of the hydrolysis of Ap(3)A and the depurination of adenosine moieties were studied under acidic conditions, and the activation parameters of the reactions were calculated. The results of the work reflect the fact that the negatively charged polyphosphate group is very resistant towards nucleophilic attack. An efficient catalysis is only observed under acidic conditions, where the phosphate group becomes protonated. General acids or bases did not catalyse the hydrolysis. Furthermore, hydroxide ion catalysed cleavage is only observed at high base concentrations and other negatively charged nucleophiles did not attack the phosphate groups of diadenosine polyphosphates." @default.
• W2024939971 created "2016-06-24" @default.
• W2024939971 creator A5003133450 @default.
• W2024939971 date "2004-01-01" @default.
• W2024939971 modified "2023-09-23" @default.
• W2024939971 title "Hydrolytic reactions of diadenosine 5′,5′-triphosphate" @default.
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• W2024939971 doi "https://doi.org/10.1039/b313200e" @default.
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