Novel reversible methionine aminopeptidase-2 (MetAP-2) inhibitors based on purine and related bicyclic templates

Bioorg Med Chem Lett. 2017 Feb 1;27(3):551-556. doi: 10.1016/j.bmcl.2016.12.019. Epub 2016 Dec 8.


The natural product fumagillin 1 and derivatives like TNP-470 2 or beloranib 3 bind to methionine aminopeptidase 2 (MetAP-2) irreversibly. This enzyme is critical for protein maturation and plays a key role in angiogenesis. In this paper we describe the synthesis, MetAP-2 binding affinity and structural analysis of reversible MetAP-2 inhibitors. Optimization of enzymatic activity of screening hit 10 (IC50: 1μM) led to the most potent compound 27 (IC50: 0.038μM), with a concomitant improvement in LLE from 2.1 to 4.2. Structural analysis of these MetAP-2 inhibitors revealed an unprecedented conformation of the His339 side-chain imidazole ring being co-planar sandwiched between the imidazole of His331 and the aryl-ether moiety, which is bound to the purine scaffold. Systematic alteration and reduction of H-bonding capability of this metal binding moiety induced an unexpected 180° flip for the triazolo[1,5-a]pyrimdine bicyclic template.

Keywords: MetAP2; Metalloprotease; Methionine aminopeptidase 2; Purine.

MeSH terms

  • Aminopeptidases / antagonists & inhibitors*
  • Aminopeptidases / metabolism
  • Dose-Response Relationship, Drug
  • Glycoproteins / antagonists & inhibitors*
  • Glycoproteins / metabolism
  • Humans
  • Methionyl Aminopeptidases
  • Models, Molecular
  • Molecular Structure
  • Purines / chemical synthesis
  • Purines / chemistry
  • Purines / pharmacology*
  • Pyrimidines / chemical synthesis
  • Pyrimidines / chemistry
  • Pyrimidines / pharmacology*
  • Structure-Activity Relationship


  • Glycoproteins
  • Purines
  • Pyrimidines
  • Aminopeptidases
  • METAP2 protein, human
  • Methionyl Aminopeptidases
  • purine