Abstract

Using a stopped flow apparatus, the effects of 2,3-diphosphoglycerate (DPG), and pH on the hemoglobin-oxygen dissociation kinetic constants were determined. The order of kinetics was pseudo-first order between 85 and 40% saturation. Increasing the concentration of DPG increased the kinetic constants in a manner which is related to the extent of binding of DPG to hemoglobin. The dependence of the kinetic constants on pH was, however, not explained in terms of the total number of DPG bound to oxyhemoglobin. The DPG was affecting the kinetic constants in such a manner that the binding was functionally linked to the Bohr proton.

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