Pyrone-based inhibitors of metalloproteinase types 2 and 3 may work as conformation-selective inhibitors

Chem Biol Drug Des. 2011 Aug;78(2):191-8. doi: 10.1111/j.1747-0285.2011.01148.x. Epub 2011 Jun 20.


Matrix metalloproteinases are zinc-containing enzymes capable of degrading all components of the extracellular matrix. Owing to their role in human disease, matrix metalloproteinase have been the subject of extensive study. A bioinorganic approach was recently used to identify novel inhibitors based on a maltol zinc-binding group, but accompanying molecular-docking studies failed to explain why one of these inhibitors, AM-6, had approximately 2500-fold selectivity for MMP-3 over MMP-2. A number of studies have suggested that the matrix-metalloproteinase active site is highly flexible, leading some to speculate that differences in active-site flexibility may explain inhibitor selectivity. To extend the bioinorganic approach in a way that accounts for MMP-2 and MMP-3 dynamics, we here investigate the predicted binding modes and energies of AM-6 docked into multiple structures extracted from matrix-metalloproteinase molecular dynamics simulations. Our findings suggest that accounting for protein dynamics is essential for the accurate prediction of binding affinity and selectivity. Additionally, AM-6 and other similar inhibitors likely select for and stabilize only a subpopulation of all matrix-metalloproteinase conformations sampled by the apo protein. Consequently, when attempting to predict ligand affinity and selectivity using an ensemble of protein structures, it may be wise to disregard protein conformations that cannot accommodate the ligand.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalytic Domain
  • Enzyme Inhibitors / chemical synthesis*
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology
  • Humans
  • Inhibitory Concentration 50
  • Matrix Metalloproteinase Inhibitors*
  • Molecular Dynamics Simulation*
  • Molecular Structure
  • Protein Binding
  • Protein Conformation
  • Pyrones / chemical synthesis*
  • Pyrones / chemistry
  • Pyrones / pharmacology
  • Substrate Specificity
  • Terphenyl Compounds / chemical synthesis*
  • Terphenyl Compounds / chemistry
  • Terphenyl Compounds / pharmacology
  • Zinc / chemistry


  • Enzyme Inhibitors
  • Matrix Metalloproteinase Inhibitors
  • Pyrones
  • Terphenyl Compounds
  • Zinc