Abstract
Hemoglobin Ohio [beta 142 (H20) Ala replaced by Asp] was found in three members of a white family, all of whom showed erythrocytosis. The variant hemoglobin has a high oxygen affinity, a reduced Bohr effect, and diminished cooperativity. The functional abnormalities of Hb Ohio are explained by the proximity of the substituent beta 142 residue, both to beta 143 His, which is involved in the DPG binding site of hemoglobin, and to the critical C terminal region of the beta chain, which participates in the stabilization of the deoxy (T) conformation.
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