Cited by 139Heat shock proteins researchUbiquitin and proteasome pathwaysProtein Structure and Dynamics

Conformational Switching of the Molecular Chaperone Hsp90 via Regulated Phosphorylation

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Soroka, Joanna, Wandinger, Sebastian K., Mäusbacher, Nina, Schreiber, Thiemo, Richter, Klaus, Daub, Henrik, Buchner, Johannes·2012·Molecular Cell

Abstract

Hsp90 is an essential molecular chaperone in the eukaryotic cytosol. Its function is modulated by cochaperones and posttranslational modifications. Importantly, the phosphatase Ppt1 is a dedicated regulator of the Hsp90 chaperone system. Little is known about Ppt1-dependent phosphorylation sites and how these affect Hsp90 activity. Here, we identified the major phosphorylation sites of yeast Hsp90 in its middle or the C-terminal domain and determined the subset regulated by Ppt1. In general, phosphorylation decelerates the Hsp90 machinery, reduces chaperone function in vivo, sensitizes yeast cells to Hsp90 inhibition and affects DNA repair processes. Modification of one particular site (S485) is lethal, whereas others modulate Hsp90 activity via distinct mechanisms affecting the ATPase activity, cochaperone binding and manipulating conformational transitions in Hsp90. Our mechanistic analysis reveals that phosphorylation of Hsp90 permits a regulation of the conformational cycle at distinct steps by targeting switch points for the communication of remote regions within Hsp90.

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Crossref · 10.1016/j.molcel.2011.12.031

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Authors
Soroka, J., Wandinger, S. K., Mäusbacher, N., Schreiber, T., Richter, K., Daub, H., & Buchner, J.
Affiliations
  • Center for Integrated Protein Science Munich (DE)
  • Max Planck Society (DE)
  • Max Planck Institute of Biochemistry (DE)
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2012-02
Volume
45
Issue
4
Pages
517-528
ISSN
1097-2765 (ISSN-L)
OpenAlex
W1985532753
Cited by
139
References
69
Citations by year
2026: 3 · 2025: 5 · 2024: 11 · 2023: 7 · 2022: 8 · 2021: 5 · 2020: 16 · 2019: 11 · 2018: 15 · 2017: 12 · 2016: 5 · 2015: 9 · 2014: 14 · 2013: 11 · 2012: 5
FWCI
5.01
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
Funders
  • Verband der Chemischen Industrie
  • Deutsche Forschungsgemeinschaft
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
HSP90, phosphorylation sites, conformational switching, molecular chaperones, ATPase activity, DNA repair, yeast, post-translational modification
MeSH terms
Fungal Proteins, Models, Molecular, Phosphorylation, Mass Spectrometry, Yeasts, Protein Structure, Tertiary, HSP90 Heat-Shock Proteins

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