Cited by 105Heat shock proteins researchFungal and yeast genetics researchBacterial Genetics and Biotechnology

Role of the heat shock transcription factor, Hsf1, in a major fungal pathogen that is obligately associated with warm‐blooded animals

Open access
Nicholls, Susan, Leach, Michelle D., Priest, Claire L., Brown, Alistair J. P.·2009·Molecular Microbiology

Abstract

Summary: All organisms have evolved mechanisms that protect them against environmental stress. The major fungal pathogen of humans, Candida albicans , has evolved robust stress responses that protect it against human immune defences and promote its pathogenicity. However, C. albicans is unlikely to be exposed to heat shock as it is obligatorily associated with warm‐blooded animals. Therefore, we examined the role of the heat shock transcription factor (Hsf1) in this pathogen. We show that C. albicans expresses an evolutionarily conserved Hsf1 (orf19.4775) that is phosphorylated in response to heat shock, induces transcription via the heat shock element (HSE), contributes to the global transcriptional response to heat shock, and is essential for viability. Why has Hsf1 been conserved in this obligate animal saprophyte? We reasoned that Hsf1 might contribute to medically relevant stress responses. However, this is not the case, as an Hsf1‐specific HSE‐lacZ reporter is not activated by oxidative, osmotic, weak acid or pH stress. Rather, Hsf1 is required for the expression of essential chaperones in the absence of heat shock (e.g. Hsp104, Hsp90, Hsp70). Furthermore, Hsf1 regulates the expression of HSE‐containing genes in response to growth temperature in C. albicans . Therefore, the main role of Hsf1 in this pathogen might be the homeostatic modulation of chaperone levels in response to growth temperature, rather than the activation of acute responses to sudden thermal transitions.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1111/j.1365-2958.2009.06883.x

Cites

99 of 99 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Hsp90 is naturally abundant in fungal cells and is induced to even greater levels by heat shock and other proteotoxic stresses.

    “Hsp90 is naturally abundant in fungal cells and is induced to even greater levels by heat shock and other proteotoxic stresses10,15,32-35.”
  • Hsp90 levels increase following environmental challenges.

    “Furthermore, although Hsp90 levels increase following environmental challenges, Hsp90 activity is tightly controlled via post-translational regulation and an autoregulatory loop involving the heat shock transcription factor, Hsf1.”
  • Hsf1 is essential for viability in yeasts, and is required for the basal expression of HSP genes.

    “Hsf1 is essential for viability in yeasts10,38,39, and is required for the basal expression of HSP genes10,39,40.”
  • Hsf1 is activated by hyperphosphorylation in response to specific environmental cues, which in some fungi include glucose starvation, superoxide, oxygen tension and changes in membrane lipid composition as well as heat shock.

    “Hsf1 is activated by hyperphosphorylation in response to specific environmental cues, which in some fungi include glucose starvation, superoxide, oxygen tension and changes in membrane lipid composition as well as heat shock10,39,45,46.”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. Do Carmo-Sousa L Rose AH Harrison JS Distribution of yeasts in nature The Yeasts 1969 1 New York Academic Press 79 105
  2. Gentles JC La Touche CJ Rose AH Harrison JS Yeasts as human and animal pathogens The Yeasts 1969 1 New York Academic Press 108 182

Cited by

Sorted by citations

Authors
Nicholls, S., Leach, M. D., Priest, C. L., & Brown, A. J. P.
Affiliations
University of Aberdeen (GB)
Corresponding author
Brown, Alistair J. P.
Venue
Molecular Microbiology
Publisher
Wiley
Published
2009-11
Volume
74
Issue
4
Pages
844-861
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W2126700110
Cited by
105
References
99
Citations by year
2026: 3 · 2025: 4 · 2024: 6 · 2023: 6 · 2022: 4 · 2021: 6 · 2020: 10 · 2019: 2 · 2018: 10 · 2017: 9 · 2016: 6 · 2015: 6 · 2014: 7 · 2013: 5 · 2012: 13
FWCI
2.82
Type
journal article
Language
en
Open access
Locations
  • Molecular Microbiology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Aberdeen University Research Archive (Aberdeen University) (submittedVersion)
Funders
  • Wellcome Trust (214004, 080088)
  • European Commission (214004)
  • Biotechnology and Biological Sciences Research Council (BB/D009308/1, BB/F00513X/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
HSF1, heat shock transcription factor, Candida albicans, heat shock response, heat shock element, molecular chaperones, Hsp104, HSP90, HSP70, growth temperature, stress response, fungal pathogens, essential genes, transcriptional regulation
MeSH terms
Heat Shock Transcription Factors, Animals, Candida albicans, DNA-Binding Proteins, Fungal Proteins, Hot Temperature, Humans, Phosphorylation, Stress, Physiological, Transcription Factors, Gene Expression Regulation, Fungal, Molecular Chaperones, Microbial Viability

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review