Abstract
The mechanisms of enzyme catalysis do not differ from those implicated in chemical catalysis. Enzymes however, due to the complexity of their three-dimensional structure, generally involve a greater number of efficiency factors than simple chemical catalysts. The principle of enzyme catalysis, like all catalysis, is to lower the energy barrier of a reaction, thereby increasing the rate of appearance of the products. There are two ways of lowering the energy barrier: either destabilising the initial state (1), or stabilising the transition state (2) in relation to the non-catalysed reaction (0), as is illustrated in Fig. 11.1. Catalysts can weaken strong substrate bonds or stabilise fractional bonds formed in activated complexes (transition states) in different manners: either by electrostatic interactions (polar effects), by covalent interaction with unpaired electrons, by creating distortions in the bond geometry, or by increasing resonance effects or internal inductive effects. In enzyme catalysis these diverse factors can intervene in the same reaction. The functional groups implicated in enzyme catalysis are of the same nature as those that are involved in chemical catalysis. They concern nucleophilic or electrophilic groups, acids or bases. It is important therefore to consider first the principles of chemical catalysis.
Keywords
Transition State Isotope Effect Enzyme Catalysis Nucleophilic Catalysis Catalytic GroupBibliography
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