ABSTRACT
Acknowledgment. ............................................................................................................................. 67 References ........................................................................................................................................ 69
Enzymes are proteins that catalyze various chemical reactions which occur in living organisms. The various classes of enzymes are presented in Table 5.1. In an enzyme-catalyzed reaction, enzyme (E) and substrate (S) form a complex, i.e., E + S ---7 ES ---7 E + P. Figure 5.1 depicts the timedependent changes in the concentrations of various components of the equation. Enzyme activity is influenced by pH, temperature, enzyme amount, substrate specificity, inhibitors, modulators, and
Classification
TABLE 5.1 Summary of the International Classification of Enzymes
Reaction catalyzed
A-+ B~A + B-Electron transfer A-B + C~A + B-C Group transfer reactions A-B + H,O~A-H + B--OH Hydrolysis reactwns
XY I I A-B~A~B + X-Y
Figure 5.1 Time-dependent changes in the concentralion of various components of E + S --> ES --> E + P. E = enzyme, S = substrate, P =product.
