what is an allosteric inhibitor
Allosteric enzymes may also have regulatory subunits that bind either activators or inhibitors. Activators and inhibitors are termed effectors.. Inhibitors cause the allosteric enzyme to adopt the inactive shape. Activators promote the active shape. An equilibrium exists between the active and inactive shapes.
The amount of active and inactive enzyme is dependent on the relative concentrations of substrate and inhibitor, as suggested by the diagram: The binding of an allosteric inhibitor causes the enzyme to adopt the inactive conformation, and promotes the cooperative binding of a second inhibitor. An excess of substrate can overcome the inhibitor effect.