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