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Monod-Wyman-Changeux (MWC) model

A concerted model for the basis of co-operativity in multimeric binding proteins, originally presented as a description of oxygen binding to each of the haem groups of the haemoglobin tetramer. In the absence of a ligand (oxygen in the case of haemoglobin) the subunits exist in a low-affinity 'taut' conformation (tense form). The ligand may bind to as many as two monomers in this conformation, at which point all four monomers convert from the low-affinity form to the high-affinity 'relaxed' conformation (R-form). (see also Koshland model (KNF model))
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