Statistical Time Events in Enzymes: A Physical Assessmen

Enzyme action is the result of a large number discrete steps involving a great variety of such as cooperative conformational, acid-base catalysis, nucleophylic and/or attack from properly positioned, etc. ; it is widely recognized that in order be useful for catalysis, the various elementary must be space- and time-controlled enzyme function. In the past decade great have been made in understanding the and the stereochemistry of enzyme, with particular emphasis on the role of the effects. Obviously, an analysis of the aspects of enzyme action is equally. The ultimate goal is the description of concomitance and/or sequence of individual steps in the catalytic act. This ambitious difficult goal can be approached by the attention on the time constants of the elementary processes and assessing their mechanism by comparative studies on model systems. This approach was introduced in enzymology with the development fast relaxation methods and will be followed in paper, with the understanding that it suffers the same intrinsic limitations as an analysis a musical piece restricted to a list of the sound occurring in it but devoid of any about their temporal sequence and intensity. aims are: . To review time events detected in using a proper physical framework, i. e. , theory of the random processes. 2. To identify these events at a molecular by comparison with processes occurring in model systems. 3. To discuss the statistical significance of detected events. shall start with the simpler model systems shall then proceed to analyze situations of complexity and eventually consider-substrate complexes. For each class of some data will be critically reviewed and relevance to enzyme catalysis stressed. All data will then be comparatively discussed according their time scale and some mechanistic will be derived. representative enzymes considered in this were chosen among those which can work separate entities in an aqueous medium because are simpler and better known.