Hsp90 interaction with clients

Trends Biochem Sci. 2015 Feb;40(2):117-25. doi: 10.1016/j.tibs.2014.12.002. Epub 2015 Jan 9.


The conserved Hsp90 chaperone is an ATP-controlled machine that assists the folding and controls the stability of select proteins. Emerging data explain how Hsp90 achieves client specificity and its role in the cellular chaperone cascade. Interestingly, Hsp90 has an extended substrate binding interface that crosses domain boundaries, exhibiting specificity for proteins with hydrophobic residues spread over a large area regardless of whether they are disordered, partly folded, or even folded. This specificity principle ensures that clients preferentially bind to Hsp70 early on in the folding path, but downstream folding intermediates bind Hsp90. Discussed here, the emerging model is that the Hsp90 ATPase does not modulate client affinity but instead controls substrate influx from Hsp70.

Keywords: Alzheimer disease; heat shock proteins; intrinsically disordered proteins; molecular chaperones; protein folding; protein–protein interactions.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Alzheimer Disease / genetics*
  • Alzheimer Disease / metabolism
  • Alzheimer Disease / pathology
  • HSP72 Heat-Shock Proteins / chemistry
  • HSP72 Heat-Shock Proteins / genetics
  • HSP72 Heat-Shock Proteins / metabolism*
  • HSP90 Heat-Shock Proteins / chemistry
  • HSP90 Heat-Shock Proteins / genetics
  • HSP90 Heat-Shock Proteins / metabolism*
  • Humans
  • Intrinsically Disordered Proteins / chemistry
  • Intrinsically Disordered Proteins / metabolism
  • Ligands
  • Molecular Chaperones / chemistry
  • Molecular Chaperones / genetics
  • Molecular Chaperones / metabolism*
  • Protein Binding / genetics
  • Protein Folding
  • Protein Interaction Maps / genetics
  • Substrate Specificity


  • HSP72 Heat-Shock Proteins
  • HSP90 Heat-Shock Proteins
  • Intrinsically Disordered Proteins
  • Ligands
  • Molecular Chaperones