Table 8-3 Maximum turnover numbers of some enzymes Turnover Enzyme number (per second) Carbonic anhydrase 600.000 3-Ketosteroid isomerase 280,000 Acetylcholinesterase 25,000 Penicillinase 2,000 Lactate dehydrogenase 1.000 Chymotrypsin 100 DNA polymerase I 15 Tryptophan synthetase isozyme 0.5