Pharmacologic shifting of a balance between protein refolding and degradation mediated by Hsp90 Article Conference Paper uri icon


MeSH Major

  • Fluorodeoxyglucose F18
  • HSP90 Heat-Shock Proteins
  • Positron-Emission Tomography
  • Receptor, ErbB-2


  • The role of the abundant stress protein Hsp90 in protecting cells against stress-induced damage is not well understood. The recent discovery that a class of ansamycin antibiotics bind specifically to Hsp90 allowed us to address this problem from a new angle. We find that mammalian Hsp90, in cooperation with Hsp70, p60, and other factors, mediates the ATP-dependent refolding of heat-denatured proteins, such as firefly luciferase. Failure to refold results in proteolysis. The ansamycins inhibit refolding, both in vivo and in a cell extract, by preventing normal dissociation of Hsp90 from luciferase, causing its enhanced degradation. This mechanism also explains the ansamycin-induced proteolysis of several protooncogenic protein kinases, such as Raf-1, which interact with Hsp90. We propose that Hsp90 is part of a quality control system that facilitates protein refolding or degradation during recovery from stress. This function is used by a limited set of signal transduction molecules for their folding and regulation under nonstress conditions. The ansamycins shift the mode of Hsp90 from refolding to degradation, and this effect is probably amplified for specific Hsp90 substrates.

publication date

  • December 10, 1996



  • Conference Paper


Digital Object Identifier (DOI)

  • 10.1073/pnas.93.25.14536

PubMed ID

  • 8962087

Additional Document Info

start page

  • 14536

end page

  • 41


  • 93


  • 25