The tenth biennial conference on enzyme mechanisms was organized by T. Fink (chairman), R. Abeles, W. Cleland, B. Metcalf, and N. Oppenheimer. It was held at the Asilomar Conference center in Pacific Grove, California. Session topics included: 1, Bioorganic mechanisms; 2, structural mechanisms; 3, mechanisms through mutagenesis; 4, mechanism-based inhibition; 5, mechanisms-general; and 6, bioinorganic mechanisms. In addition to the lectures, two poster sessions were held which included topics from several areas of mechanistic enzymology. A brief summary of the lectures and a few references are presented below. As in the past, the authors and titles of the posters will also be listed. 1987.