Novel insights into the mechanism of chaperone-assisted protein disaggregation.
Cell survival under severe thermal stress requires the activity of a bi-chaperone system, consisting of the ring-forming AAA+ chaperone ClpB (Hsp104) and the DnaK (Hsp70) chaperone system, which acts to solubilize and reactivate aggregated proteins. Recent studies have provided novel insight into the mechanism of protein disaggregation, demonstrating that ClpB/Hsp104 extracts unfolded polypeptides from an aggregate by threading them through its central pore. This translocation activity is necessary but not sufficient for aggregate solubilization. In addition, the middle (M) domain of ClpB and the DnaK system have essential roles, possibly by providing an unfolding force, which facilitates the extraction of misfolded proteins from aggregates.
Weibezahn
Jimena
J
Zentrum für Molekulare Biologie Heidelberg, Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany.
Schlieker
Christian
C
Tessarz
Peter
P
Mogk
Axel
A
Bukau
Bernd
B
D049071:Endopeptidase Clp; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000378:metabolism; D018840:HSP70 Heat-Shock Proteins / Q000737:chemistry / Q000378:metabolism*; D006360:Heat-Shock Proteins / Q000737:chemistry / Q000378:metabolism; D018869:Heat-Shock Response; D007700:Kinetics; D018832:Molecular Chaperones / Q000235:genetics / Q000378:metabolism*; D011487:Protein Conformation; D017510:Protein Folding; D020673:Protein Renaturation
D029968:Escherichia coli Proteins; D018840:HSP70 Heat-Shock Proteins; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D049071:Endopeptidase Clp; C063842:dnaK protein, E coli; C069775:ClpB protein, E coli