Cytoplasmic localization of sterol transcription factors Upc2p and Ecm22p in S. cerevisiae
Open accessAbstract
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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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).”
From Gain-of-Function Mutations in <i>UPC2</i> Are a Frequent Cause of <i>ERG11</i> Upregulation in Azole-Resistant Clinical Isolates of Candida albicans (2012) · cites this paper as [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].”
From Regulation of Ergosterol Biosynthesis in Saccharomyces cerevisiae (2020) · cites this paper as [72]
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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)
- PMC
- PMC2580778
- 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
- green
- www.ncbi.nlm.nih.gov
- 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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