Molecular chaperones and protein quality control.
In living cells, both newly made and preexisting polypeptide chains are at constant risk for misfolding and aggregation. In accordance with the wide diversity of misfolded forms, elaborate quality-control strategies have evolved to counter these inevitable mishaps. Recent reports describe the removal of aggregates from the cytosol; reveal mechanisms for protein quality control in the endoplasmic reticulum; and provide new insight into two classes of molecular chaperones, the Hsp70 system and the AAA+ (Hsp100) unfoldases.
Bukau
Bernd
B
Zentrum fur Molekulare Biologie, Universität Heidelberg, 69120 Heidelberg, Germany.
Weissman
Jonathan
J
Horwich
Arthur
A