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. 1969 Jan;48(1):126–138. doi: 10.1172/JCI105961

Subunit dissociation of certain abnormal human hemoglobins

H Franklin Bunn 1
PMCID: PMC322198  PMID: 5765016

Abstract

The extent of dissociation of various hemoglobins into subunits was estimated from their elution volumes (Ve) on G-100 Sephadex. Under the same controlled conditions carboxyhemoglobins A, A3 (A1), F, S, and C all had the same elution volumes. The carboxy and cyanmet derivatives of hemoglobin Kansas (a variant with very low oxygen affinity) had a relatively high Ve, indicating a decreased mean molecular weight and therefore an increased tendency to form dimers and even monomers. Conversely, the liganded derivatives of hemoglobin Chesapeake (a variant with high oxygen affinity) had a relatively low Ve, suggestive of an impaired degree of subunit dissociation. Deoxyhemoglobin Chesapeake had a Ve identical with that of deoxyhemoglobin A. Cat hemoglobin, known to have an unusually low oxygen affinity, was found to have a higher Ve than human, dog, rabbit, rat, or guinea pig hemoglobins.

Haptoglobin is thought to bind αβ dimers in preference to the α2β2-tetramer. The comparative haptoglobin affinities of the human hemoglobins were measured by competition between the test hemoglobin and radioactive reference hemoglobin for haptoglobin binding sites. Hemoglobins A, F, S, and C all seemed to bind equally readily, but hemoglobin Kansas and cat hemoglobin showed a higher affinity, and hemoglobin Chesapeake a lower affinity.

These results are in accord with recently proposed models which predict that hemoglobins which have an increased degree of subunit dissociation will have a low oxygen affinity, and vice versa.

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Selected References

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