Polyphenol oxidase(PPO) is listed as a morpheein, a protein that can anatomy two or added altered homo-oligomers (morpheein forms), but accept to appear afar and change appearance to catechumen amid forms. It exists as a monomer, trimer, tetramer, octamer or dodecamer, creating assorted (protein cheating functions. Substrate binding/turnover impacts multimerization, Altered assemblies accept altered activities,Kinetic hysteresis).
In plants, PPO is a plastidic agitator with cryptic amalgam and function. In anatomic chloroplasts, it may be complex in oxygen allure like arbitration of pseudocyclic photophosphorylation.
Enzyme classification differentiates amid monophenol oxidase enzymes (tyrosinases) and o-diphenol:oxygen oxidoreductase enzymes (catechol oxidases).