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Fluoride and azide binding to ferric human hemoglobin:haptoglobin complexes highlights the ligand-dependent inequivalence of the α and β hemoglobin chains

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Abstract

Haptoglobin (Hp) binds human hemoglobin (Hb), contributing to prevent extra-erythrocytic Hb-induced damage. Hp forms preferentially complexes with αβ dimers, displaying heme-based reactivity. Here, kinetics and thermodynamics of fluoride and azide binding to ferric human Hb (Hb(III)) complexed with the human Hp phenotypes 1-1 and 2-2 (Hp1-1:Hb(III) and Hp2-2:Hb(III), respectively) are reported (pH 7.0 and 20.0 °C). Fluoride binds to Hp1-1:Hb(III) and Hp2-2:Hb(III) with a one-step kinetic and equilibrium behavior. In contrast, kinetics of azide binding to and dissociation from Hp1-1:Hb(III)(–N3) and Hp2-2:Hb(III)(–N3) follow a two-step process. However, azide binding to Hp1-1:Hb(III) and Hp2-2:Hb(III) is characterized by a simple equilibrium, reflecting the compensation of kinetic parameters. The fast and the slow step of azide binding to Hp1-1:Hb(III) and Hp2-2:Hb(III) should reflect azide binding to the ferric β and α chains, respectively, as also proposed for the similar behavior observed in Hb(III). Present results highlight the ligand-dependent kinetic inequivalence of Hb subunits in the ferric form, reflecting structural differences between the two subunits in the interaction with some ferric ligands.

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Abbreviations

CCP domain:

Complement control protein domain

Hb:

Human hemoglobin

Hb(III):

Ferric Hb

Hp:

Human haptoglobin

Hp1-1:

Phenotype 1-1 of Hp

Hp2-2:

Phenotype 2-2 of Hp

Hp1-1:Hb(III):

Ferric Hp1-1:Hb complex

Hp2-2:Hb(III):

Ferric Hp 2-2:Hb complex

SP-like domain:

Serine protease-like domain

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Acknowledgements

The Grant of Dipartimenti di Eccellenza, MIUR (Legge 232/2016, Articolo 1, Comma 314-337) is gratefully acknowledged.

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Correspondence to Paolo Ascenzi.

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Ascenzi, P., di Masi, A., De Simone, G. et al. Fluoride and azide binding to ferric human hemoglobin:haptoglobin complexes highlights the ligand-dependent inequivalence of the α and β hemoglobin chains. J Biol Inorg Chem 24, 247–255 (2019). https://doi.org/10.1007/s00775-019-01642-9

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  • DOI: https://doi.org/10.1007/s00775-019-01642-9

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