Editing Allosteric regulation (section)

=== Concerted model ===

The  concerted model of allostery, also referred to as the symmetry model or [[MWC model]], postulates that enzyme subunits are connected in such a way that a conformational change in one subunit is necessarily conferred to all other subunits. Thus, all subunits must exist in the same conformation. The model further holds that, in the absence of any ligand (substrate or otherwise), the equilibrium favors one of the conformational states, T or R.  The equilibrium can be shifted to the R or T state through the binding of one [[ligand (biochemistry)|ligand]] (the allosteric effector or ligand) to a site that is different from the active site