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- W2074403760 abstract "Microcalorimetry, high-performance liquid chromatography (h.p.l.c.), and an enzymatic assay have been used to conduct a thermodynamic investigation of five phosphate hydrolysis reactions: {α-d-galactose 1-phosphate(aq) + H2O(l) = d-galactose(aq) + orthophosphate(aq)} (1), {sn-glycerol 3-phosphate(aq) + H2O(l) = glycerol(aq) + orthophosphate(aq)} (2), {4-nitrophenyl phosphate(aq) + H2O(l) = 4-nitrophenol(aq) + orthophosphate(aq)} (3), {phosphocreatine(aq) + H2O(l) = creatine(aq) + orthophosphate(aq)} (4), and {3-phospho-d-glycerate(aq) + H2O(l) = d-glycerate(aq) + orthophosphate(aq)} (5). Calorimetrically determined enthalpies of reaction ΔrH(cal) were measured for reactions (1)–(5) and the apparent equilibrium constant K′ was measured for reaction (2). The pKs and standard enthalpies of reaction ΔrH∘ for the H+ and Mg2+ binding reactions of the reactants and products in the aforementioned reactions were obtained either from the literature or by estimation. A chemical equilibrium model was then used to calculate standard equilibrium constants K and standard enthalpies of reaction ΔrH∘ for chemical reference reactions that correspond to the overall biochemical reactions that were studied experimentally. Property values from the literature and thermodynamic network calculations were used to obtain values of the equilibrium constants for the chemical reference reactions that correspond to the overall biochemical reactions (1). These values were compared with other results from the literature and also correlated with structural features. The results obtained in this study can be used in the chemical equilibrium model to calculate values of K′, the standard apparent Gibbs free energy changes ΔrG′∘, the standard apparent enthalpy changes ΔrH′∘, changes in binding of the proton ΔrN(H+), and the position of equilibrium for the overall biochemical reactions considered in this study over a reasonably wide range of temperature, pH, pMg [−log10{m(Mg2+)/m°}], and ionic strength I. Values of K′ and ΔrG′° under approximately physiological conditions (T = 310.15 K, pH 7.0, pMg = 3.0, and Im = 0.25 mol · kg−1) have been calculated." @default.
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- W2074403760 date "2009-05-01" @default.
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- W2074403760 title "Thermodynamics of the hydrolysis reactions of α-d-galactose 1-phosphate, sn-glycerol 3-phosphate, 4-nitrophenyl phosphate, phosphocreatine, and 3-phospho-d-glycerate" @default.
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- W2074403760 doi "https://doi.org/10.1016/j.jct.2008.12.017" @default.
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