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A Structural and Calorimetric Study on the Interaction Between Jack Bean Urease and Cyanide Ion

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Abstract

The cyanide ion was studied as an effecter of Jack bean urease at 300 K in 30 mmol⋅L−1 Tris buffer, pH=7. The inhibition was investigated by isothermal titration calorimetry (ITC). The extended solvation model was used for CN+JBU interaction over the whole range of CN concentrations. The binding parameters recovered from the solvation model were attributed to the interaction with cyanide ion. It was found that cyanide ion acted as a noncooperative inhibitor of urease, and there is a set of 12 identical and independent binding sites for CN ions. The dissociation equilibrium constant is 749.99 μmol⋅L−1. The molar enthalpy of binding is ΔH=−13.60 kJ⋅mol−1.

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Rezaei Behbehani, G., Saboury, A.A., Mohebbian, M. et al. A Structural and Calorimetric Study on the Interaction Between Jack Bean Urease and Cyanide Ion. J Solution Chem 38, 1612–1621 (2009). https://doi.org/10.1007/s10953-009-9471-7

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  • DOI: https://doi.org/10.1007/s10953-009-9471-7

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