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Journal Article
Research Support, Non-U.S. Gov't
Changes of polymerization and conformation of hemoglobin S induced by thiol reagents.
Biochimica et Biophysica Acta 1990 November 16
Thiol reagents, covalently bound to cysteine beta 93, either inhibit or facilitate the polymerization process of hemoglobin S. The progelling effect of parahydroxymercurybenzoate or 2,2'-dithiodipyridine contrasted with the increased oxygen affinity and the destabilization of the T state of Hb shown by functional and NMR studies. Thiol reagents increased the oxygen affinity of Hb from 30 to 1000%. Such variability was also observed in the reduction (up to 50%) of the alkaline Bohr effect. We show that the antigelling or progelling activity of thiol reagents does not depend solely on the concentration of molecules present in the deoxy T state but that specific effects of the reagent affects molecular interactions of the hemoglobin S polymerization process.
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