Oligomeric enzymes consist of two or more polypeptide chains linked together by non-covalent interactions. Examples of oligomeric enzymes include lactate dehydrogenase, which is a tetramer, and tryptophan synthase, which contains two different subunits that each have distinct catalytic functions. Oligomeric enzyme organization allows for complex regulation through allostery and feedback inhibition not possible with monomeric enzymes.