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Protein Function

Protein Function. Quaternary structure of deoxy- and oxyhemoglobin. R-state. T-state. D-2,3-bisphosphoglycerate (BPG). BPD binds to hemoglobin and decreases the oxygen affinity and keeps it in the deoxy form. BPG binds 1:1 with a K=1x10 -5 M to the deoxy form but weakly to the oxy form.

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BPG binds in the cavity between the ?-chains, making electrostatic interactions

BPG binds in the cavity between the ?-chains, making electrostatic interactions BPG cannot bind to the oxy form, thus functions by stabilizing the deoxy form. The decrease in oxygen affinity is explained by stabilization of deoxy-Hb.

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Oxy form - PowerPoint PPT Presentation

Protein Function

BPG binds in the cavity between the ?-chains, making electrostatic interactions