Biology / Unit 13 Bio 3161 short lesson, about 20 seconds
Hemoglobin Structure and Cooperative Binding
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The idea
Hemoglobin, a four-subunit protein inside erythrocytes, binds up to four oxygen molecules cooperatively, meaning each bound oxygen makes the next site bind more readily.
In practice
Cooperative binding lets hemoglobin load oxygen rapidly at the lungs and still unload it efficiently at low-oxygen tissue.
Where people slip
Cooperative binding is a property of the whole four-subunit protein, not of any single binding site acting alone.
Your place on the trail
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