Abstract
A relation between pH-induced conformational transitions of horse heart ferricytochrome c and the kinetics of external ligand coordination to heme iron was investigated by optical spectroscopy, circular dichroism and viscometry. The dependencies of both the association, k a, and dissociation rate constants of cyanide binding on pH were determined from kinetic measurements. The association rate constant exhibits a bell-shaped form of dependence on pH in the region where this protein unfolds. The maximum of the dependence of k a on pH is found to be coincident with the pK values of conformational transitions of ferricytochrome c in solutions with both low and high ionic strengths. This observation is explained in terms of ferricytochrome c unfolding, which is characterized by two processes: the gradual opening of the heme crevice accompanied by the detachment of the axial Met80 and its replacement with a water molecule. The former process enhances the rate, whereas the latter results in the inhibition of the rate of cyanide binding.
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This work was supported by research grants 2/6167/26 and 1/3252/06 from the Slovak Grant Agency. We thank Dr. Marián Fabian for his editorial help in preparing the manuscript.
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Varhač, R., Antalík, M. Correlation of acid-induced conformational transition of ferricytochrome c with cyanide binding kinetics. J Biol Inorg Chem 13, 713–721 (2008). https://doi.org/10.1007/s00775-008-0357-8
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DOI: https://doi.org/10.1007/s00775-008-0357-8