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A quantitative analysis of the effects of 2,3‐diphosphoglycerate, adenosine triphosphate and inositol hexaphosphate on the oxygen dissociation curve of human haemoglobin.
Author(s) -
Goodford P J,
St-Louis J,
Wootton R
Publication year - 1978
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1978.sp012508
Subject(s) - allosteric regulation , chemistry , diphosphoglycerate , adenosine triphosphate , oxygen , effector , inositol , oxygen–haemoglobin dissociation curve , dissociation (chemistry) , biophysics , adenosine diphosphate , stereochemistry , biochemistry , receptor , platelet , biology , organic chemistry , platelet aggregation , immunology
1. Oxygen dissociation curves have been measured for human haemoglobin solutions with different concentrations of the allosteric effectors 2,3‐diphosphoglycerate, adenosine triphosphate and inositol hexaphosphate. 2. Each effector produces a concentration dependent right shift of the oxygen dissociation curve, but a point is reached where the shift is maximal and increasing the effector concentration has no further effect. 3. Mathematical models based on the Monod, Wyman & Changeux (1965) treatment of allosteric proteins have been fitted to the data. For each compound the simple two‐state model and its extension to take account of subunit inequivalence were shown to be inadequate, and a better fit was obtained by allowing the effector to lower the oxygen affinity of the deoxy conformational state as well as binding preferentially to this conformation.