2-Benzamido-N-(1H-benzo[d]imidazol-2-yl)thiazole-4-carboxamide derivatives as potent inhibitors of CK1δ/ε

Amino Acids. 2012 Oct;43(4):1577-91. doi: 10.1007/s00726-012-1234-x. Epub 2012 Feb 14.

Abstract

In this study we identified two heterocyclic compounds (5 and 6) as potent and specific inhibitors of CK1δ (IC(50) = 0.040 and 0.042 μM, respectively). Whereas compound 5 exhibited fivefold higher affinity towards CK1δ than to CK1ε (IC(50) CK1ε = 0.199 μM), compound 6 also inhibited CK1ε (IC(50) = 0.0326 μM) in the same range as CK1δ. Selected compound 5 was screened over 442 kinases identifying 5 as a highly potent and selective inhibitor of CK1δ. X-ray analysis of 5 bound to CK1δ demonstrated its binding mode. In addition, characterization of 5 and 6 in a cell biological approach revealed the ability of both compounds to inhibit proliferation of tumor cell lines in a dose and cell line specific manner. In summary, our optimizations lead to the development of new highly selective CK1δ and ε specific inhibitors with biological activity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antineoplastic Agents / chemical synthesis
  • Antineoplastic Agents / pharmacology*
  • Benzimidazoles / chemical synthesis
  • Benzimidazoles / pharmacology*
  • Casein Kinase 1 epsilon / antagonists & inhibitors*
  • Casein Kinase 1 epsilon / chemistry
  • Casein Kinase 1 epsilon / metabolism
  • Casein Kinase Idelta / antagonists & inhibitors*
  • Casein Kinase Idelta / chemistry
  • Casein Kinase Idelta / metabolism
  • Cell Line, Tumor
  • Cell Survival / drug effects
  • Computer Simulation
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / pharmacology*
  • Humans
  • Inhibitory Concentration 50
  • Kinetics
  • Mice
  • Models, Molecular
  • Mutation
  • Phosphopeptides / chemistry*
  • Phosphorylation
  • Quantitative Structure-Activity Relationship
  • Rats
  • Recombinant Proteins / antagonists & inhibitors
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / metabolism
  • Substrate Specificity
  • Thiazoles / chemical synthesis
  • Thiazoles / pharmacology*

Substances

  • 2-(2-(trifluoromethoxy)benzamido)-N-(6-(trifluoromethyl)-1H-benzo(d)imidazol-2-yl)thiazole-4-carboxamide
  • Antineoplastic Agents
  • Benzimidazoles
  • Enzyme Inhibitors
  • Phosphopeptides
  • Recombinant Proteins
  • Thiazoles
  • Casein Kinase 1 epsilon
  • Casein Kinase Idelta