Structure-based computational methods continue to enhance progress in
the discovery and refinement of therapeutic agents. Several such metho
ds and their applications are described. These include molecular visua
lization and molecular modeling, docking, fragment methods, 3-D databa
se techniques, and free-energy perturbation. Related issues that are d
iscussed include the use of simplified potential energy functions and
the determination of the positions of tightly bound waters. Strengths
and weaknesses of the various methods are described.