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A property of certain proteins (often enzymes) in which the binding curves or saturation curves or, in the case of enzymes, a plot of initial rates as a function of initial substrate concentration, are nonhyperbolic; suggests that the binding of a ligand has a different affinity at different ligand concentrations. Both allosterism and hysteresis display cooperativity. Compare: allosterism, hysteresis.
cooperativity/co·op·er·a·tiv·i·ty/ (ko-op″er-ah-tiv´ĭ-te) the phenomenon of alteration in binding of subsequent ligands upon binding of an initial ligand by an enzyme, receptor, or other molecule with multiple binding sites; the affinity for further binding may be enhanced (positive c.) or decreased (negative c.) .
interaction between some proteins in which the binding of one may increase or decrease binding of the other.