A novel approach for characterizing protein ligand complexes: molecular basis for specificity of small-molecule Bcl-2 inhibitors.

Journal Article

The increasing diversity of small molecule libraries has been an important source for the development of new drugs and, more recently, for unraveling the mechanisms of cellular events-a process termed chemical genetics.(1) Unfortunately, the majority of currently available compounds are mechanism-based enzyme inhibitors, whereas most of cellular activity regulation proceeds on the level of protein-protein interactions. Hence, the development of small molecule inhibitors of protein-protein interactions is important. When screening compound libraries, low-micromolar inhibitors of protein interactions can be routinely found. The enhancement of affinities and rationalization of the binding mechanism require structural information about the protein-ligand complexes. Crystallization of low-affinity complexes is difficult, and their NMR analysis suffers from exchange broadening, which limits the number of obtainable intermolecular constraints. Here we present a novel method of ligand validation and optimization, which is based on the combination of structural and computational approaches. We successfully used this method to analyze the basis for structure-activity relationships of previously selected (2) small molecule inhibitors of the antiapoptotic protein Bcl-xL and identified new members of this inhibitor family.

Full Text

Duke Authors

Cited Authors

  • Lugovskoy, AA; Degterev, AI; Fahmy, AF; Zhou, P; Gross, JD; Yuan, J; Wagner, G

Published Date

  • February 20, 2002

Published In

Volume / Issue

  • 124 / 7

Start / End Page

  • 1234 - 1240

PubMed ID

  • 11841292

International Standard Serial Number (ISSN)

  • 0002-7863

Language

  • eng

Conference Location

  • United States