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- W2020732436 abstract "Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of several biochemical reactions catalyzed by the enzymes d-hydantoinase and N-carbamoyl-d-amino acid hydrolase. Values of apparent equilibrium constants K′ and calorimetrically determined molar enthalpies of reaction ΔrHm(cal) were measured for the following d-hydantoinase catalyzed reactions: hydantoin(aq) + H2O(l) = ureidoacetic acid(aq); 5,6-dihydrouracil(aq) + H2O(l) = 3-ureidopropanoic acid(aq); 5-phenylhydantoin(aq) + H2O(l) = 5-phenyl d-carbamoylate(aq); and 5-(4-hydroxyphenyl)hydantoin(aq) + H2O(l) = 5-(4-hydroxyphenyl) d-carbamoylate(aq). Calorimetric measurements, in which both d-hydantoinase and N-carbamoyl-d-amino acid hydrolase were present, were performed on the following reactions: 5-phenylhydantoin(aq) + 3 H2O(l) = d-phenylglycine(aq) + carbon dioxide(aq) + ammonia(aq); and (4-hydroxy)-phenylhydantoin(aq) + 3H2O(l) = d-(4-hydroxyphenyl)glycine(aq) + carbon dioxide(aq) + ammonia(aq). A chemical equilibrium model was then used to calculate thermodynamic property values (equilibrium constants K, standard molar enthalpies of reaction ΔrHm∘, standard molar Gibbs free energies of reaction ΔrGm∘, and standard molar entropies of reaction ΔrSm∘) for chemical reference reactions that correspond to the overall biochemical reactions that were studied experimentally. In several cases, we also provided estimated property values based on data for structurally similar reactions. The results can be used together with the chemical equilibrium model to calculate values of K′, the standard apparent molar Gibbs free energy change ΔrGm′∘, the standard apparent molar enthalpy change ΔrHm′∘, changes in binding of the proton ΔrN(H+), and the position of equilibrium for the several overall biochemical reactions considered in this study over a reasonably wide range of temperature, pH, and ionic strength." @default.
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- W2020732436 date "2007-05-01" @default.
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- W2020732436 title "Thermodynamics of reactions catalyzed by d-hydantoinase and N-carbamoyl-d-amino acid hydrolase" @default.
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- W2020732436 doi "https://doi.org/10.1016/j.jct.2006.10.010" @default.
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