Insights into Hsp90 mechanism and in vivo functions learned from studies in the yeast, Saccharomyces cerevisiae
Open accessAbstract
The molecular chaperone Hsp90 (Heat shock protein, 90 kDa) is an abundant and essential cytosolic protein required for the stability and/or folding of hundreds of client proteins. Hsp90, along with helper cochaperone proteins, assists client protein folding in an ATP-dependent pathway. The laboratory of Susan Lindquist, in collaboration with other researchers, was the first to establish the yeast Saccharomyces cerevisiae as a model organism to study the functional interaction between Hsp90 and clients. Important insights from studies in her lab were that Hsp90 is essential, and that Hsp90 functions and cochaperone interactions are highly conserved between yeast and mammalian cells. Here, we describe key mechanistic insights into the Hsp90 folding cycle that were obtained using the yeast system. We highlight the early contributions of the laboratory of Susan Lindquist and extend our analysis into the broader use of the yeast system to analyze the understanding of the conformational cycle of Hsp90 and the impact of altered Hsp90 function on the proteome.
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In C. albicans, Hsp90 regulates echinocandin resistance via calcineurin, and depletion of Hsp90 mimics the azole sensitivity seen in calcineurin and protein kinase C mutants.
“In C. albicans, Hsp90 regulates echinocandin resistance via calcineurin, and depletion of Hsp90 mimics the azole sensitivity seen in calcineurin and protein kinase C mutants [38,64].”
From Disruption of the UPC2 Gene Enhances Fluconazole Antifungal Activity by Inhibiting HAC1 mRNA Splicing in Candida albicans (2026) · cites this paper as [64]
The Conclusion (page unavailable) mentions a general role for Hsp90 in fungal pathogenesis but does not discuss the claimed mechanism or drug-sensitivity comparison. Searches for C. albicans, echinocandins, calcineurin, azole sensitivity, and Hsp90 depletion found no passage in our copy addressing those claims. (LLM, conf=0.77)
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“Cryo-EM structures of Hsp90 bound to individual cochaperones, some also in complex with clients are available (Verba et al., 2016; Liu et al., 2020; Lee et al., 2021; Noddings et al., 2022; Wang et al., 2022; Noddings et al., 2023).”
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Hsp70 and Hsp90 post-translational modifications and translating the chaperone code
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Integrated omic analysis of a new flavor yeast strain in fermented rice milk
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“In C. albicans , Hsp90 regulates echinocandin resistance via calcineurin, and depletion of Hsp90 mimics the azole sensitivity seen in calcineurin and protein kinase C mutants [38,64].”
An isotype-specific phosphorylation of Hsp90 rewires co-chaperone regulations
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Ibrasheva, G., Chen, Y., Chirgwin, M. E., Hughes, C. J., Fitzgerald, M. C., & Derbyshire, E. R. (2026) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.64898/2026.08.28.747854
- Authors
- Rios, E. I., Hunsberger, I. L., & Johnson, J. L.
- Affiliations
- University of Idaho (US)
- Corresponding author
- Johnson, Jill L.
- ORCID
- Johnson, Jill L.
- Venue
- Frontiers in Molecular Biosciences
- Publisher
- Frontiers Media SA
- Published
- 2024-02-08
- Volume
- 11
- Pages
- 1325590-1325590
- ISSN
- 2296-889X (ISSN-L)
- PMC
- PMC10881880
- OpenAlex
- W4391649778
- Cited by
- 7
- References
- 144
- Citations by year
- 2026: 3 · 2025: 4
- FWCI
- 0.29
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Frontiers in Molecular Biosciences (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Institutes of Health
- National Institute of General Medical Sciences (R01GM127675)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Keywords
- HSP90, molecular chaperones, Saccharomyces cerevisiae, co-chaperones, conformational cycle, protein stability, proteome
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