4X6I | pdb_00004x6i

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Development of N-(Functionalized benzoyl)-homocycloleucyl-glycinonitriles as Potent Cathepsin K Inhibitors.

(2015) J Med Chem 58: 6928-6937

• PubMed: 26280490 Search on PubMed
• DOI: https://doi.org/10.1021/acs.jmedchem.5b00746
• Primary Citation Related Structures: 
  4X6H, 4X6I, 4X6J


• PubMed Abstract: 
  

  Cathepsin K is a major drug target for osteoporosis and related-bone disorders. Using a combination of virtual combinatorial chemistry, QSAR modeling, and molecular docking studies, a series of cathepsin K inhibitors based on N-(functionalized benzoyl)-homocycloleucyl-glycinonitrile scaffold was developed. In order to avoid previous problems of cathepsin K inhibitors associated with lysosomotropism of compounds with basic character that resulted in off-target effects, a weakly- to nonbasic moiety was incorporated into the P3 position. Compounds 5, 6, and 9 were highly selective for cathepsin K when compared with cathepsins L and S, with the Ki values in the 10-30 nM range. The kinetic studies revealed that the new compounds exhibited reversible tight binding to cathepsin K, while the X-ray structural studies showed covalent and noncovalent binding between the nitrile group and the catalytic cysteine (Cys25) site.

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Organizational Affiliation: 
• National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
Department of Biochemistry, Molecular and Structural Biology, Jozef Stefan Institute , Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia.