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HSP90--news from the front

U Jakob1

  • 1Department of Biology, University of Michigan, Ann Arbor, Michigan, USA. ujakob@biology.lsa.umich.edu

Frontiers in Bioscience : a Journal and Virtual Library
|April 15, 1997
PubMed
Summary

Heat shock protein 90 (Hsp90) acts as a molecular chaperone, preventing protein aggregation and aiding refolding. This ATP-independent function explains its broad roles in cellular protein homeostasis.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Heat shock protein 90 (Hsp90) is abundant in eukaryotic and prokaryotic cells.
  • Hsp90 interacts with steroid receptors and kinases, regulating cellular processes.
  • Its high abundance and heat shock regulation remain incompletely understood.

Purpose of the Study:

  • To elucidate the broader chaperone functions of Hsp90 beyond its known regulatory roles.
  • To investigate Hsp90's mechanism as an ATP-independent molecular chaperone.
  • To reconcile Hsp90's specialized binding with its general chaperone activity.

Main Methods:

  • In vitro studies of Hsp90 binding to protein folding intermediates.
  • Analysis of Hsp90's effect on protein aggregation and refolding.
  • Characterization of Hsp90's ATP-independent chaperone activity.

Main Results:

  • Hsp90 binds transiently to late-stage, structured folding intermediates.
  • Hsp90 effectively prevents aggregation of these intermediates.
  • Hsp90 supports the refolding of intermediates into their native states.

Conclusions:

  • Hsp90 functions as an ATP-independent molecular chaperone.
  • It plays a crucial role in maintaining protein homeostasis by assisting the folding of structured intermediates.
  • This dual role explains Hsp90's specialized interactions and general chaperone promiscuity.

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