Q. What are the allosteric enzymes?

Allosteric enzymes are those that have in excess of one activation center and to which other substances, called allosteric regulators, bind.

Allosteric regulators can be allosteric activators or allosteric inhibitors. The interaction between an allosteric inhibitor and the allosteric enzyme disallows the binding of the substrate to the enzyme. The interaction between the allosteric activator and the allosteric enzyme allows the binding of the substrate to the enzyme and sometimes enhance the affinity of the enzyme for the substrate. This regulatory phenomenon of the enzyme activity is known as allosterism.