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Eg5, a mitotic kinesin exclusively involved in the formation and function of the mitotic spindle has attracted interest as an anticancer drug target. Eg5 is co-crystallized with several inhibitors bound to its allosteric binding pocket. Each of these occupies a pocket formed by loop5/helix α2. Recently designed inhibitors additionally occupy a hydrophobic pocket of this site. The goal of the present study was to identify new fragments which fill this hydrophobic pocket and might be interesting chemical moieties to design new inhibitors.
We've used the fragment based protocol of MED-SuMo which exploits the whole PDB on the basis that similar protein surfaces might bind the same fragment. The MED-SuMo software is able to compare and superimpose similar protein-ligand interaction surfaces at PDB scale. Protein-fragment complexes are encoded as MED-Portions by cross-mining 3D PDB ligand structures with fragment-like PubChem molecules. Inhibitors are designed by hybridising MED-Portions with MED-Hybridise.
Without using the known Eg5 PDB ligands that occupy the hydrophobic pocket, we've predicted new potential ligands that would fill simultaneously both pockets. Some of the latter are identified in libraries of synthetically accessible molecules by the MED-Search software.