Allosteric Effects
In hemoglobin, allosteric effects occur

for maintaining Fe in the Fe2+ state
to maximize oxygen delivery to the tissues
only in humans
to minimize oxygen delivery to the tissues

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Allosteric Effects
The conformational changes from the T to the R state is initiated by

movement of the F-helix, which contains the proximal His
movement of the proximal histidine towards the heme
binding of oxygen to the heme
reorganization of protein-protein contacts between the individual subunits

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Allosteric Effects
Bisphosphoglycerate (BPG) cannot bind to the oxygenated R state of hemoglobin because

it is displaced from the heme by oxygen
BPG binds to the R state with the same affinity as the T state
it is displaced from the heme by movement of the proximal histidine
its binding pocket becomes too small to accommodate BPG

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