Values of kcat (Turnover Number) for Some Enzymes Enzyme keat (sec-1) Catalase 40,000,000 Carbonic anhydrase 1,000,000 Acetylcholinesterase 14,000 Penicillinase 2,000 Lactate dehydrogenase 1,000 Chymotrypsin 100 DNA polymerase I 15 Lysozyme 0.5