Abstract
The ease of formation of iron(IV) complexes in horseradish peroxidase as well as in other hemoproteins has been cited to support the view that in these proteins the proximal histidyl imidazole is deprotonated. However, most of the supporting evidence for this proposal has been indirect. From a detailed comparison of the proton nmr spectra of horseradish peroxidase in several oxidation/spin/ligation states with other hemoproteins and model compounds, it is shown hereby direct detection of the N1H signal, that the proximal histidyl imidazole in horseradish peroxidase is definitely not deprotonated, but most likely involved in hydrogen bonding interactions with the protein in at least the reduced and the cyanide-ligated states.
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La Mar, G.N., Chacko, V.P., de Ropp, J.S. (1982). The State of Protonation of the Proximal Histidyl Imidazole in Horseradish Peroxidase. In: Dunford, H.B., Dolphin, D., Raymond, K.N., Sieker, L. (eds) The Biological Chemistry of Iron. NATO Advanced Study Institutes Series, vol 89. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7882-9_23
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DOI: https://doi.org/10.1007/978-94-009-7882-9_23
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