Cited by 136Fungal and yeast genetics researchHeat shock proteins researchAntifungal resistance and susceptibility

Heat Shock Protein 90 Is Required for Conidiation and Cell Wall Integrity in Aspergillus fumigatus

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Lamoth, Frédéric, Juvvadi, Praveen R., Fortwendel, Jarrod R., Steinbach, William J.·2012·Eukaryotic Cell

Abstract

Heat shock protein 90 (Hsp90) is a eukaryotic molecular chaperone. Its involvement in the resistance of Candida albicans to azole and echinocandin antifungals is well established. However, little is known about Hsp90's function in the filamentous fungal pathogen Aspergillus fumigatus . We investigated the role of Hsp90 in A. fumigatus by genetic repression and examined its cellular localization under various stress conditions. Failure to generate a deletion strain of hsp90 suggested that it is essential. Genetic repression of Hsp90 was achieved by an inducible nitrogen-dependent promoter ( pniiA -Hsp90) and led to decreased spore viability, decreased hyphal growth, and severe defects in germination and conidiation concomitant with the downregulation of the conidiation-specific transcription factors brlA , wetA , and abaA . Hsp90 repression potentiated the effect of cell wall inhibitors affecting the β-glucan structure of the cell wall (caspofungin, Congo red) and of the calcineurin inhibitor FK506, supporting a role in regulating cell wall integrity pathways. Moreover, compromising Hsp90 abolished the paradoxical effect of caspofungin. Pharmacological inhibition of Hsp90 by geldanamycin and its derivatives (17-AAG and 17-DMAG) resulted in similar effects. C-terminal green fluorescent protein (GFP) tagging of Hsp90 revealed mainly cytosolic distribution under standard growth conditions. However, treatment with caspofungin resulted in Hsp90 accumulation at the cell wall and at sites of septum formation, further highlighting its role in cell wall stress compensatory mechanisms. Targeting Hsp90 with fungal-specific inhibitors to cripple stress response compensatory pathways represents an attractive new antifungal strategy.

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Crossref · 10.1128/ec.00032-12

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Authors
Lamoth, F., Juvvadi, P. R., Fortwendel, J. R., & Steinbach, W. J.
Affiliations
Duke Medical Center (US)
Venue
Eukaryotic Cell
Published
2012-11
Volume
11
Issue
11
Pages
1324-1332
ISSN
  • 1535-9778 (ISSN-L)
  • 1535-9786
OpenAlex
W2106567443
Cited by
136
References
42
Citations by year
2026: 6 · 2025: 4 · 2024: 7 · 2023: 5 · 2022: 11 · 2021: 8 · 2020: 12 · 2019: 10 · 2018: 9 · 2017: 11 · 2016: 19 · 2015: 17 · 2014: 10 · 2013: 5 · 2012: 2
FWCI
4.37
Type
journal article
Language
en
Open access
Locations
  • Eukaryotic Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (134303)
  • National Institute of Allergy and Infectious Diseases (R56AI077648, T32AI052080)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
Keywords
HSP90, Aspergillus fumigatus, conidiation, cell wall integrity, molecular chaperones, brlA, weta, abaA, caspofungin, Congo red, FK506, geldanamycin, 17-AAG, 17-DMAG, hyphal growth, spore viability, septum formation, antifungal drug targets, fungal pathogens
MeSH terms
Caspofungin, Aspergillus fumigatus, Cell Wall, Cytosol, Fungal Proteins, Promoter Regions, Genetic, Spores, Fungal, Stress, Physiological, Transcription Factors, Transcription, Genetic, Gene Expression Regulation, Fungal, Benzoquinones, Tacrolimus, Gene Deletion, HSP90 Heat-Shock Proteins, Hyphae, Lactams, Macrocyclic, beta-Glucans, Green Fluorescent Proteins, Microbial Viability, Echinocandins, Lipopeptides

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