PETases are an esterase class of enzymes that catalyze the breakdown (via hydrolysis) of polyethylene terephthalate (PET) plastic to monomeric mono-2-hydroxyethyl terephthalate (MHET). The idealized chemical reaction is: (ethylene terephthalate)n + H2O → (ethylene terephthalate)n-1 + MHET, where n ...