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Abstract| Volume 262, ISSUE 33, P15890-15893, November 25, 1987

The effect of 2,3-diphosphoglycerate on the tetramer-dimer equilibrium of carbon monoxide hemoglobin in dilute solution. Correlation between sedimentation and kinetic behavior.

Open AccessPublished:November 25, 1987DOI:https://doi.org/10.1016/S0021-9258(18)47672-7
The effect of 2,3-diphosphoglycerate on the tetramer-dimer equilibrium of carbon monoxide hemoglobin in dilute solution. Correlation between sedimentation and kinetic behavior.
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      The effect of 2,3-diphospho-D-glycerate on the sedimentation coefficient of carbon monoxide hemoglobin was correlated with the fraction of rapidly reacting hemoglobin observed subsequent to flash photolysis at 23 degrees C at pH 7.30 in buffers of 0.1 M ionic strength. Concentrations of the organic phosphate up to about 5 mM resulted in an increase in S20,w, consistent with an increase in the fraction of tetrameric hemoglobin. A decrease in rapidly reacting hemoglobin parallelled the increase in the sedimentation coefficient. Between 5 and 20 mM 2,3-diphosphoglycerate, S20,w decreased, suggesting that dissociation to dimers was enhanced. An increase in rapidly reacting hemoglobin was also observed in this concentration range. Similar sedimentation results were obtained with oxyhemoglobin at pH 7.00 and carbon monoxide hemoglobin at pH 7.06. Assuming single binding sites on each species, the dissociation constants for 2,3-diphosphoglycerate binding to tetrameric and dimeric HbCO are 0.2-0.3 mM and 2-5 mM at pH 7.30. This biphasic effect of this physiologically important organic phosphate on the state of aggregation of R state hemoglobin has not been previously reported, but it is similar to that previously noted with inositol hexaphosphate, which enhanced tetramer formation at low concentrations, while at higher concentrations it promoted hemoglobin dissociation to dimers (White, S. L. (1976) J. Biol. Chem. 251, 4763-4769; Gray, R. D. (1980) J. Biol. Chem. 255, 1812-1818).

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      Published online: November 25, 1987

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      DOI: https://doi.org/10.1016/S0021-9258(18)47672-7

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