Since the publication of the successful and popular second edition of Fundamentals of Enzymology in 1989 there has been a large increase in the knowledge of several aspects of enzymology, not least the rapid acceleration of structural characterization of enzymes and the development of the field of bioinformatics. This new edition places appropriate emphasis on the new knowledge and consolidates the strengths of the previous editions. As before, Fundamentals of Enzymology 3rd ed gives anall-round view of the field including enzyme purification and characterization, enzyme structure (including information on the web), enzyme kinetics, the mechanisms and control of enzyme action, enzyme folding, how enzymes act in vivo, enzyme synthesis and degradation, and also clinical and industrial applications of enzymology. Throughout the book, the integration of these themes is stressed.