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pH-dependent redox and CO binding properties of chelated protoheme-l-histidine and protoheme-glycyl-l-histidine complexes

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Abstract

The pH dependence of redox properties, spectroscopic features and CO binding kinetics for the chelated protohemin-6(7)-l-histidine methyl ester (heme-H) and the chelated protohemin-6(7)-glycyl-l-histidine methyl ester (heme-GH) systems has been investigated between pH 2.0 and 12.0. The two heme systems appear to be modulated by four protonating groups, tentatively identified as coordinated H2O, one of heme’s propionates, Nε of the coordinating imidazole, and the carboxylate of the histidine residue upon hydrolysis of the methyl ester group (in acid medium). The pK a values are different for the two hemes, thus reflecting structural differences. In particular, the different strain at the Fe–N ε bond, related to the different length of the coordinating arm, results in a dramatic alteration of the bond strength, which is much smaller in heme-H than in heme-GH. It leads to a variation in the variation of the pK a for the protonation of the N ε of the axial imidazole as well as in the proton-linked behavior of the other protonating groups, envisaging a cross-talk communication mechanism among different groups of the heme, which can be operative and relevant also in the presence of the protein matrix.

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Acknowledgements

This work was supported by COST D21 and MIUR (COFIN 2004055484). We thank G. Smulevich and A. Feis for several stimulating discussions.

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Authors and Affiliations

  1. Department of Molecular, Cellular and Animal Biology, University of Camerino, Via F. Camerini 2, 62032, Camerino, Italy

    Giampiero De Sanctis

  2. Department of Experimental Medicine and Biochemical Sciences, University of Roma—Tor Vergata, Via Montpellier 1, 00133, Roma, Italy

    Giovanni Francesco Fasciglione, Stefano Marini, Federica Sinibaldi, Roberto Santucci & Massimo Coletta

  3. Department of General Chemistry, University of Pavia, Via Taramelli 12, 27100, Pavia, Italy

    Enrico Monzani, Corrado Dallacosta & Luigi Casella

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  1. Giampiero De Sanctis
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  2. Giovanni Francesco Fasciglione
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  3. Stefano Marini
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  4. Federica Sinibaldi
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  5. Roberto Santucci
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  9. Massimo Coletta
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Correspondence to Massimo Coletta.

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De Sanctis, G., Fasciglione, G.F., Marini, S. et al. pH-dependent redox and CO binding properties of chelated protoheme-l-histidine and protoheme-glycyl-l-histidine complexes. J Biol Inorg Chem 11, 153–167 (2006). https://doi.org/10.1007/s00775-005-0060-y

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  • DOI: https://doi.org/10.1007/s00775-005-0060-y

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