Structure-guided optimization of small molecule c-Abl activators

J Comput Aided Mol Des. 2014 Feb;28(2):75-87. doi: 10.1007/s10822-014-9731-5. Epub 2014 Feb 27.

Abstract

c-Abl kinase is maintained in its normal inactive state in the cell through an assembled, compact conformation. We describe two chemical series that bind to the myristoyl site of the c-Abl kinase domain and stimulate c-Abl activation. We hypothesize that these molecules activate c-Abl either by blocking the C-terminal helix from adopting a bent conformation that is critical for the formation of the autoinhibited conformation or by simply providing no stabilizing interactions to the bent conformation of this helix. Structure-based molecular modeling guided the optimization of binding and activation of c-Abl of these two chemical series and led to the discovery of c-Abl activators with nanomolar potency. The small molecule c-Abl activators reported herein could be used as molecular tools to investigate the biological functions of c-Abl and therapeutic implications of its activation.

MeSH terms

  • Binding Sites
  • Crystallography, X-Ray
  • Hydrophobic and Hydrophilic Interactions
  • Models, Molecular*
  • Protein Conformation
  • Protein Structure, Tertiary
  • Proto-Oncogene Proteins c-abl / chemistry
  • Proto-Oncogene Proteins c-abl / metabolism*
  • Pyrazoles / chemistry
  • Small Molecule Libraries / metabolism
  • Small Molecule Libraries / pharmacology*
  • Structure-Activity Relationship

Substances

  • Pyrazoles
  • Small Molecule Libraries
  • Proto-Oncogene Proteins c-abl