title: Heat shock proteins: cell protection through protein triage.
abstract: Heat shock proteins (HSPs) are chaperones that catalyze the proper folding of nascent proteins and the refolding of denatured proteins. The ubiquitin-proteasome system is an error-checking system that directs improperly folded proteins for destruction. A coordinated interaction between the HSPs (renaturation) and the proteasome (degradation) must exist to assure protein quality control mechanisms. Although it still remains unknown how the decision of folding vs. degradation is taken, many pieces of evidence demonstrate that HSPs interact directly or indirectly with the proteasome, assuring quite selectively the proteasomal degradation of certain proteins under stress conditions. In this review, we will describe the different data that demonstrate a role for HSP90, HSP70, HSP27, and áB-crystallin in the partitioning of proteins to either one of these pathways, referred as protein triage.
authors.affiliation: INSERM U866, University of Burgundy, Dijon, France.
authors.forename: David
authors.initials: D
authors.lastname: Lanneau
authors.forename: Guillaume
authors.initials: G
authors.lastname: Wettstein
authors.forename: Philippe
authors.initials: P
authors.lastname: Bonniaud
authors.forename: Carmen
authors.initials: C
authors.lastname: Garrido
mesh_terms: D000818:Animals; D003459:Crystallins / Q000378:metabolism; D055551:HSP27 Heat-Shock Proteins / Q000378:metabolism*; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism*; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism*; D006801:Humans; D008954:Models, Biological; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism; D011485:Protein Binding; D015398:Signal Transduction
chemical_list: D003459:Crystallins; D055551:HSP27 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D046988:Proteasome Endopeptidase Complex