Structure-Activity Studies of Bis-O-Arylglycolamides: Inhibitors of the Integrated Stress Response

ChemMedChem. 2016 Apr 19;11(8):870-80. doi: 10.1002/cmdc.201500483. Epub 2016 Jan 20.


The integrated stress response comprises multiple signaling pathways for detecting and responding to cellular stress that converge at a single event-the phosphorylation of Ser51 on the α-subunit of eukaryotic translation initiation factor 2 (eIF2α). Phosphorylation of eIF2α (eIF2α-P) results in attenuation of global protein synthesis via the inhibitory effects of eIF2α-P on eIF2B, the guanine exchange factor (GEF) for eIF2. Herein we describe structure-activity relationship (SAR) studies of bis-O-arylglycolamides, first-in-class integrated stress response inhibitors (ISRIB). ISRIB analogues make cells insensitive to the effects of eIF2α-P by activating the GEF activity of eIF2B and allowing global protein synthesis to proceed with residual unphosphorylated eIF2α. The SAR studies described herein support the proposed pharmacology of ISRIB analogues as binding across a symmetrical protein-protein interface formed between protein subunits of the dimeric eIF2B heteropentamer.

Keywords: ISRIB; integrated stress response; protein-protein interactions; structure-activity relationships; unfolded protein response.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Dose-Response Relationship, Drug
  • Eukaryotic Initiation Factor-2 / agonists
  • Eukaryotic Initiation Factor-2 / chemistry
  • Eukaryotic Initiation Factor-2 / metabolism*
  • Glycolates / chemical synthesis
  • Glycolates / chemistry
  • Glycolates / pharmacology*
  • HEK293 Cells
  • Humans
  • Molecular Structure
  • Phosphorylation / drug effects
  • Protein Binding / drug effects
  • Stress, Physiological / drug effects*
  • Structure-Activity Relationship


  • Eukaryotic Initiation Factor-2
  • Glycolates