A thermodynamic study on the binding of cobalt(II) and iron(III) ions with bovine carbonic anhydrase II at different temperatures

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Abstract

A thermodynamic study on the interaction of bovine carbonic anhydrase II, CAII, with cobalt(II) and iron(III) ions was made using isothermal titration calorimetry (ITC) at 300.15 K and 310.15 K in Tris buffer solutions at pH=7.5. The enthalpies of interaction of Co 2+ + CAII and Fe 3+ + CAII are reported and analyzed in terms of the extended solvation theory. The results indicate that there are three identical and non-cooperative binding sites for Co 2+ and Fe 3+ ions. Binding of these ions with CAII occurs exothermically with dissociation equilibrium constants of 87.15 and 91.00 μmol̇L -1 at 300.15 K, for Co 2+ and Fe 3+ , respectively. © 2010 The Author(s).

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Rezaei Behbehani, G., Divsalar, A., Saboury, A. A., Hajian, R., Rezaei, Z., Yahaghi, E., & Barzegar, L. (2010). A thermodynamic study on the binding of cobalt(II) and iron(III) ions with bovine carbonic anhydrase II at different temperatures. Journal of Solution Chemistry, 39(8), 1142–1152. https://doi.org/10.1007/s10953-010-9572-3

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