Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1
Hsf1 is an ancient transcription factor that responds to protein folding stress by inducing the heat-shock response (HSR) that restore perturbed proteostasis. Hsp70 chaperones negatively regulate the activity of Hsf1 via stress-responsive mechanisms that are poorly understood. Here, we have reconsti...
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doaj-da724e3aabc248c09d454e29b0a18d682021-05-05T17:57:09ZengeLife Sciences Publications LtdeLife2050-084X2019-09-01810.7554/eLife.47791Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1Anna E Masser0Wenjing Kang1Joydeep Roy2Jayasankar Mohanakrishnan Kaimal3Jany Quintana-Cordero4Marc R Friedländer5Claes Andréasson6https://orcid.org/0000-0001-8948-0685Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Science for Life Laboratory, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Science for Life Laboratory, Stockholm University, Stockholm, SwedenDepartment of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, SwedenHsf1 is an ancient transcription factor that responds to protein folding stress by inducing the heat-shock response (HSR) that restore perturbed proteostasis. Hsp70 chaperones negatively regulate the activity of Hsf1 via stress-responsive mechanisms that are poorly understood. Here, we have reconstituted budding yeast Hsf1-Hsp70 activation complexes and find that surplus Hsp70 inhibits Hsf1 DNA-binding activity. Hsp70 binds Hsf1 via its canonical substrate binding domain and Hsp70 regulates Hsf1 DNA-binding activity. During heat shock, Hsp70 is out-titrated by misfolded proteins derived from ongoing translation in the cytosol. Pushing the boundaries of the regulatory system unveils a genetic hyperstress program that is triggered by proteostasis collapse and involves an enlarged Hsf1 regulon. The findings demonstrate how an apparently simple chaperone-titration mechanism produces diversified transcriptional output in response to distinct stress loads.https://elifesciences.org/articles/47791Hsf1heat shock responseheat shock proteinHsp70chaperone |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anna E Masser Wenjing Kang Joydeep Roy Jayasankar Mohanakrishnan Kaimal Jany Quintana-Cordero Marc R Friedländer Claes Andréasson |
spellingShingle |
Anna E Masser Wenjing Kang Joydeep Roy Jayasankar Mohanakrishnan Kaimal Jany Quintana-Cordero Marc R Friedländer Claes Andréasson Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 eLife Hsf1 heat shock response heat shock protein Hsp70 chaperone |
author_facet |
Anna E Masser Wenjing Kang Joydeep Roy Jayasankar Mohanakrishnan Kaimal Jany Quintana-Cordero Marc R Friedländer Claes Andréasson |
author_sort |
Anna E Masser |
title |
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 |
title_short |
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 |
title_full |
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 |
title_fullStr |
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 |
title_full_unstemmed |
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 |
title_sort |
cytoplasmic protein misfolding titrates hsp70 to activate nuclear hsf1 |
publisher |
eLife Sciences Publications Ltd |
series |
eLife |
issn |
2050-084X |
publishDate |
2019-09-01 |
description |
Hsf1 is an ancient transcription factor that responds to protein folding stress by inducing the heat-shock response (HSR) that restore perturbed proteostasis. Hsp70 chaperones negatively regulate the activity of Hsf1 via stress-responsive mechanisms that are poorly understood. Here, we have reconstituted budding yeast Hsf1-Hsp70 activation complexes and find that surplus Hsp70 inhibits Hsf1 DNA-binding activity. Hsp70 binds Hsf1 via its canonical substrate binding domain and Hsp70 regulates Hsf1 DNA-binding activity. During heat shock, Hsp70 is out-titrated by misfolded proteins derived from ongoing translation in the cytosol. Pushing the boundaries of the regulatory system unveils a genetic hyperstress program that is triggered by proteostasis collapse and involves an enlarged Hsf1 regulon. The findings demonstrate how an apparently simple chaperone-titration mechanism produces diversified transcriptional output in response to distinct stress loads. |
topic |
Hsf1 heat shock response heat shock protein Hsp70 chaperone |
url |
https://elifesciences.org/articles/47791 |
work_keys_str_mv |
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1721458910399823872 |