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The interaction of organic phosphates with human and chicken hemoglobin

par Brygier, Jenta ;De Bruin, Simon S.H.;van Hoof, P.A.M.;Rollema, Harry H.S.
Référence European journal of biochemistry / FEBS, 60, 2, page (379-383)
Publication Publié, 1975

Article révisé par les pairs

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Résumé :

The binding properties of inositol hexaphosphate and 2,3 biphosphoglycerate to chicken and human deoxyhemoglobin and carboxyhemoglobin were compared. It appeared that in all cases the binding to chicken hemoglobin is much stronger than to human hemoglobin. This is very probably due to the fact that 4 out of the 12 residues, responsible for the binding of phosphates in chicken hemoglobin, are arginines. These are absent in human hemoglobin, where the binding site is made up by only 8 residues. For chicken hemoglobin one strong binding site could be observed in both unliganded and liganded hemoglobin. From these observations it is concluded tht the same binding site is involved in both the oxy and deoxy structure showing a different affinity to phosphates in the two conformational states. For human hemoglobin the same conclusion was reached.