Regulating the ARNT/TACC3 axis: multiple approaches to manipulating protein/protein interactions with small molecules

ACS Chem Biol. 2013 Mar 15;8(3):626-35. doi: 10.1021/cb300604u. Epub 2012 Dec 26.


For several well-documented reasons, it has been challenging to develop artificial small molecule inhibitors of protein/protein complexes. Such reagents are of particular interest for transcription factor complexes given links between their misregulation and disease. Here we report parallel approaches to identify regulators of a hypoxia signaling transcription factor complex, involving the ARNT subunit of the HIF (Hypoxia Inducible Factor) activator and the TACC3 (Transforming Acidic Coiled Coil Containing Protein 3) coactivator. In one route, we used in vitro NMR and biochemical screening to identify small molecules that selectively bind within the ARNT PAS (Per-ARNT-Sim) domain that recruits TACC3, identifying KG-548 as an ARNT/TACC3 disruptor. A parallel, cell-based screening approach previously implicated the small molecule KHS101 as an inhibitor of TACC3 signaling. Here, we show that KHS101 works indirectly on HIF complex formation by destabilizing both TACC3 and the HIF component HIF-1α. Overall, our data identify small molecule regulators for this important complex and highlight the utility of pursuing parallel strategies to develop protein/protein inhibitors.

Publication types

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

MeSH terms

  • Animals
  • Aryl Hydrocarbon Receptor Nuclear Translocator / antagonists & inhibitors*
  • Aryl Hydrocarbon Receptor Nuclear Translocator / isolation & purification
  • Aryl Hydrocarbon Receptor Nuclear Translocator / metabolism
  • Crystallography, X-Ray
  • HEK293 Cells
  • Humans
  • Microtubule-Associated Proteins / antagonists & inhibitors*
  • Microtubule-Associated Proteins / isolation & purification
  • Microtubule-Associated Proteins / metabolism
  • Models, Molecular
  • Protein Binding / drug effects
  • Rats
  • Small Molecule Libraries / chemistry
  • Small Molecule Libraries / pharmacology*
  • Structure-Activity Relationship
  • Thiazoles / chemistry
  • Thiazoles / pharmacology*


  • ARNT protein, human
  • KHS101
  • Microtubule-Associated Proteins
  • Small Molecule Libraries
  • TACC3 protein, human
  • Thiazoles
  • Aryl Hydrocarbon Receptor Nuclear Translocator