What are the regulatory and the catalytic subunits of the hetero-multimers referred to in allosteric inhibition? The protein has two different kinds of subunits, one polypeptide is in charge of carrying out the catalytic reaction, doing the catalysis. The other is specialized to bind the allosteric inhibitor (e.g., the end-product of a biosynthetic pathway) and in doing so inhibits the catalytic polypeptide from