Cited by 415Hemoglobin structure and functionHemoglobinopathies and Related DisordersProtein Interaction Studies and Fluorescence Analysis

Exchange of Heme among Hemoglobins and between Hemoglobin and Albumin

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Bunn, H F, Jandl, J H·1968·Journal of Biological Chemistry

Abstract

Intact heme groups undergo exchange between molecules of human hemoglobin under physiological conditions. This phenomenon requires the presence of ferrihemoglobin and is blocked by heme ligands or the prior binding of hemoglobin to haptoglobin. The kinetics of heme exchange between hemoglobins A and F allows a calculation of the rate constants for the dissociation of heme and globin. The rate of exchange of hemes between the non-α chains of ferrihemoglobins A and F is approximately 8 times that between the α chains. Mixtures of ferrihemoglobins and oxyhemoglobins exchange hemes at a rate greater than predicted from the rates of exchange observed in mixtures containing only oxyhemoglobin or ferrihemoglobin. Ferriheme groups also undergo exchange between hemoglobin not bound to haptoglobin and methemalbumin, although at equilibrium the affinity of human albumin for ferriheme is only about one-fifteenth that of globin. Only primate albumins possess appreciable affinity for ferriheme; albumins from the nonprimate species examined appeared to be incapable of forming methemalbumin. Depletion of hemes from ferrihemoglobin by excess human albumin leads to the accumulation of free, precipitable globin.

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Crossref · 10.1016/s0021-9258(18)93628-8

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Authors
Bunn, H. F., & Jandl, J. H.
Affiliations
Harvard University (US)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1968-02
Volume
243
Issue
3
Pages
465-475
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1509804778
Cited by
415
References
37
Citations by year
2026: 5 · 2025: 2 · 2024: 8 · 2023: 4 · 2022: 6 · 2021: 5 · 2020: 19 · 2019: 12 · 2018: 11 · 2017: 8 · 2016: 17 · 2015: 12 · 2014: 9 · 2013: 12 · 2012: 9
FWCI
12.00
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
  • Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Interaction Studies and Fluorescence Analysis
Keywords
hemoglobin, hemoglobin A, fetal hemoglobin, methemoglobin, methemalbumin, human serum albumin, haptoglobin, globin, oxyhemoglobin
MeSH terms
Animals, Haplorhini, Blood Proteins, Carbon Isotopes, Cattle, Chromatography, Ion Exchange, Dialysis, Dogs, Electron Transport, Electrophoresis, Guinea Pigs, Haptoglobins, Heme, Hemoglobins, Hemoglobins, Abnormal, Hydrogen-Ion Concentration, Iron Isotopes, Kinetics, Mathematics, Methylcellulose, Protein Binding, Rabbits, Serum Albumin, Temperature, Rats

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