Structure-based design of orally bioavailable 1H-pyrrolo[3,2-c]pyridine inhibitors of mitotic kinase monopolar spindle 1 (MPS1)

J Med Chem. 2013 Dec 27;56(24):10045-65. doi: 10.1021/jm401395s. Epub 2013 Dec 2.

Abstract

The protein kinase MPS1 is a crucial component of the spindle assembly checkpoint signal and is aberrantly overexpressed in many human cancers. MPS1 is one of the top 25 genes overexpressed in tumors with chromosomal instability and aneuploidy. PTEN-deficient breast tumor cells are particularly dependent upon MPS1 for their survival, making it a target of significant interest in oncology. We report the discovery and optimization of potent and selective MPS1 inhibitors based on the 1H-pyrrolo[3,2-c]pyridine scaffold, guided by structure-based design and cellular characterization of MPS1 inhibition, leading to 65 (CCT251455). This potent and selective chemical tool stabilizes an inactive conformation of MPS1 with the activation loop ordered in a manner incompatible with ATP and substrate-peptide binding; it displays a favorable oral pharmacokinetic profile, shows dose-dependent inhibition of MPS1 in an HCT116 human tumor xenograft model, and is an attractive tool compound to elucidate further the therapeutic potential of MPS1 inhibition.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Administration, Oral
  • Aniline Compounds / administration & dosage
  • Aniline Compounds / chemistry
  • Aniline Compounds / pharmacology*
  • Biological Availability
  • Cell Cycle Proteins / antagonists & inhibitors*
  • Cell Cycle Proteins / metabolism
  • Dose-Response Relationship, Drug
  • Drug Design*
  • Heterocyclic Compounds, 2-Ring / administration & dosage
  • Heterocyclic Compounds, 2-Ring / chemistry
  • Heterocyclic Compounds, 2-Ring / pharmacology*
  • Models, Molecular
  • Molecular Structure
  • Protein Kinase Inhibitors / administration & dosage
  • Protein Kinase Inhibitors / chemistry
  • Protein Kinase Inhibitors / pharmacology*
  • Protein-Serine-Threonine Kinases / antagonists & inhibitors*
  • Protein-Serine-Threonine Kinases / metabolism
  • Protein-Tyrosine Kinases / antagonists & inhibitors*
  • Protein-Tyrosine Kinases / metabolism
  • Structure-Activity Relationship

Substances

  • Aniline Compounds
  • Cell Cycle Proteins
  • Heterocyclic Compounds, 2-Ring
  • Protein Kinase Inhibitors
  • tert-butyl 6-(2-chloro-4-(1-methyl-1H-imidazol-5-yl)phenylamino)-2-(1-methyl-1H-pyrazol-4-yl)-1H-pyrrolo(3,2-c)pyridine-1-carboxylate
  • Protein-Tyrosine Kinases
  • Protein-Serine-Threonine Kinases
  • TTK protein, human

Associated data

  • PDB/4C4E
  • PDB/4C4F
  • PDB/4C4G
  • PDB/4C4H
  • PDB/4C4I
  • PDB/4C4J