Bacterial and Yeast AAA+ Disaggregases ClpB and Hsp104 Operate through Conserved Mechanism Involving Cooperation with Hsp70
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Bacterial and Yeast AAA+ Disaggregases ClpB and Hsp104 Operate through Conserved Mechanism Involving Cooperation with Hsp70. / Kummer, Eva; Szlachcic, Anna; Franke, Kamila B; Ungelenk, Sophia; Bukau, Bernd; Mogk, Axel.
In: Journal of Molecular Biology, Vol. 428, No. 21, 2016, p. 4378-4391.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Bacterial and Yeast AAA+ Disaggregases ClpB and Hsp104 Operate through Conserved Mechanism Involving Cooperation with Hsp70
AU - Kummer, Eva
AU - Szlachcic, Anna
AU - Franke, Kamila B
AU - Ungelenk, Sophia
AU - Bukau, Bernd
AU - Mogk, Axel
N1 - Copyright © 2016 Elsevier Ltd. All rights reserved.
PY - 2016
Y1 - 2016
N2 - Escherichia coli ClpB and Saccharomyces cerevisiae Hsp104 are members of the Hsp100 family of ring-forming hexameric AAA+ chaperones that promote the solubilization of aggregated proteins and the propagation of prions. ClpB and Hsp104 cooperate with cognate Hsp70 chaperones for substrate targeting and activation of ATPase and substrate threading, achieved by transient Hsp70 binding to the repressing ClpB/Hsp104 M-domain. Fundamental differences in ATPase regulation and disaggregation mechanisms have been reported; however, these differences are raising doubts regarding the working principle of this AAA+ chaperone. In particular, unique functional plasticity was suggested to specifically enable Hsp104 to circumvent Hsp70 requirement for derepression in protein disaggregation and prion propagation. We show here that both ClpB and Hsp104 cooperation with Hsp70 is crucial for efficient protein disaggregation and, in contrast to earlier claims, cannot be circumvented by activating M-domain mutations. Activation of ClpB and Hsp104 requires two signals, relief of M-domain repression and substrate binding, leading to increased ATPase subunit coupling. These data demonstrate that ClpB and Hsp104 operate by the same basic mechanism, underscore a dominant function of Hsp70 in regulating ClpB/Hsp104 activity, and explain a plethora of in vivo studies showing a crucial function of Hsp70 in proteostasis and prion propagation.
AB - Escherichia coli ClpB and Saccharomyces cerevisiae Hsp104 are members of the Hsp100 family of ring-forming hexameric AAA+ chaperones that promote the solubilization of aggregated proteins and the propagation of prions. ClpB and Hsp104 cooperate with cognate Hsp70 chaperones for substrate targeting and activation of ATPase and substrate threading, achieved by transient Hsp70 binding to the repressing ClpB/Hsp104 M-domain. Fundamental differences in ATPase regulation and disaggregation mechanisms have been reported; however, these differences are raising doubts regarding the working principle of this AAA+ chaperone. In particular, unique functional plasticity was suggested to specifically enable Hsp104 to circumvent Hsp70 requirement for derepression in protein disaggregation and prion propagation. We show here that both ClpB and Hsp104 cooperation with Hsp70 is crucial for efficient protein disaggregation and, in contrast to earlier claims, cannot be circumvented by activating M-domain mutations. Activation of ClpB and Hsp104 requires two signals, relief of M-domain repression and substrate binding, leading to increased ATPase subunit coupling. These data demonstrate that ClpB and Hsp104 operate by the same basic mechanism, underscore a dominant function of Hsp70 in regulating ClpB/Hsp104 activity, and explain a plethora of in vivo studies showing a crucial function of Hsp70 in proteostasis and prion propagation.
KW - Endopeptidase Clp
KW - Escherichia coli/enzymology
KW - Escherichia coli Proteins/metabolism
KW - HSP70 Heat-Shock Proteins/metabolism
KW - Heat-Shock Proteins/metabolism
KW - Protein Aggregates
KW - Protein Interaction Mapping
KW - Saccharomyces cerevisiae/enzymology
KW - Saccharomyces cerevisiae Proteins/metabolism
U2 - 10.1016/j.jmb.2016.09.003
DO - 10.1016/j.jmb.2016.09.003
M3 - Journal article
C2 - 27616763
VL - 428
SP - 4378
EP - 4391
JO - Journal of Molecular Biology
JF - Journal of Molecular Biology
SN - 0022-2836
IS - 21
ER -
ID: 257864856