Cited by 47Fungal and yeast genetics researchAntifungal resistance and susceptibilityCancer, Lipids, and Metabolism

Cytoplasmic localization of sterol transcription factors Upc2p and Ecm22p in S. cerevisiae

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Marie, Chelsea, Leyde, Sarah, White, Theodore C.·2008·Fungal Genetics and Biology

Abstract

Ergosterol homeostasis is a critical process for fungal cells. Paralogous zinc cluster transcription factors Upc2p and Ecm22p are major regulators of ergosterol biosynthesis in Saccharomyces cerevisiae. Upc2p and Ecm22p sense and respond to sterol depletion but their mechanism of activation has not been defined. Subcellular localization and functional expression of Upc2p-GFP and Ecm22p-GFP was monitored by fluorescence microscopy and flow cytometry in live yeast cells. Both fusion proteins localized to intracellular membranes and to perinuclear foci. Perinuclear localization of Upc2p-GFP and Ecm22p-GFP was increased when ergosterol biosynthesis was blocked by azole drug treatment. Nuclear localization in response to sterol depletion is consistent with the hypothesis that Upc2p and Ecm22p are trafficked from a membrane to the nucleus as a post-translational mechanism of sterol sensing.

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Crossref · 10.1016/j.fgb.2008.07.004

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  • ScUpc2 and ScEcm22 are localized to intracellular membranes outside the nucleus, and under sterol-depleting conditions, perinuclear localization is increased.

    “Previous work in S. cerevisiae shows that ScUpc2 and ScEcm22 are localized to intracellular membranes outside the nucleus, and under sterol-depleting conditions, perinuclear localization is increased (20).”
  • Under normal conditions, the binding of ergosterol to a deep hydrophobic pocket within Upc2 CTD retains the transcription factor in the cytosol in its repressed form.

    “Under normal conditions, the binding of ergosterol to a deep hydrophobic pocket within Upc2 CTD retains the transcription factor in the cytosol in its repressed form, probably because sterol binding masks its bipartite amino-terminal nuclear localization signal (NLS) or because of its interaction with a hypothetical cytosolic protein (Figure 2B) [71,72].”

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  1. [23]Standards NCfCL Reference method for broth dilution antifungal susceptibliityy testing of yeasts: approved standard M27-A2 2002 2nd edition Wayne, PA Clincial Laboratory Standards Institute

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Authors
Marie, C., Leyde, S., & White, T. C.
Affiliations
  • University of Washington (US)
  • Center for Infectious Disease Research (US)
Corresponding author
White, Theodore C.
Venue
Fungal Genetics and Biology
Publisher
Elsevier BV
Published
2008-10
Volume
45
Issue
10
Pages
1430-1438
ISSN
1087-1845 (ISSN-L)
OpenAlex
W2159939027
Cited by
47
References
35
Citations by year
2025: 3 · 2024: 6 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 3 · 2015: 4 · 2014: 1 · 2013: 4 · 2012: 2
FWCI
2.19
Type
journal article
Language
en
Open access
Locations
  • Fungal Genetics and Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Dental and Craniofacial Research (R01DE011367, R01DE017078, R01 DE17078, R01 DE-11367, R01 DE 14161, R01DE014161)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Lipids, and Metabolism
Keywords
zinc cluster transcription factors, sterol homeostasis, ergosterol biosynthesis, subcellular localization, nuclear localization, sterol sensing, Saccharomyces cerevisiae
MeSH terms
Azoles, Cytoplasm, Ergosterol, Recombinant Fusion Proteins, Saccharomyces cerevisiae, Transcription Factors, Trans-Activators, Protein Transport, Saccharomyces cerevisiae Proteins, Green Fluorescent Proteins

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