Heme stability in the human embryonic hemoglobins

Robson, N.C. and Brittain, T. (1996) Heme stability in the human embryonic hemoglobins. Journal of Inorganic Biochemistry, 64(3), pp. 137-147. (doi:10.1016/0162-0134(96)00030-X)

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Abstract

The three human embryonic hemoglobins undergo both monomolecular and nucleophile stimulated bimolecular oxidations. Azide acts as an efficient nucleophile for the oxidative process in which the three embryonic hemoglobins exhibit lower oxidation rates than the adult protein. The absolute rates of azide-induced oxidation together with the rates of spontaneous autooxidation correlate with the previously determined oxygen affinities of the embryonic hemoglobins. The pH dependence of the rates of oxidation and their chloride ion concentration dependence are discussed. Heme exchange to human serum albumin has been used to determine the relative binding constants for heme for each of the embryonic proteins. Rate data have also been employed to evaluate the tetramer-dimer equilibrium constant for each hemoglobin. Overall, the data indicate that the high oxygen affinity human embryonic hemoglobins are significantly less susceptible to anion-induced oxidation, and the heme groups in each of the embryonic globin proteins are more tightly bound than in the corresponding adult protein.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Robson, Dr Neil
Authors: Robson, N.C., and Brittain, T.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Journal of Inorganic Biochemistry
ISSN:0162-0134

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