Cited by 138Fungal and yeast genetics researchGenomics and Chromatin DynamicsBacterial Genetics and Biotechnology

Dual Activators of the Sterol Biosynthetic Pathway of Saccharomyces cerevisiae : Similar Activation/Regulatory Domains but Different Response Mechanisms

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Davies, Brandon S. J., Wang, Helen S., Rine, Jasper·2005·Molecular and Cellular Biology

Abstract

Genes encoding biosynthetic enzymes that make ergosterol, the major fungal membrane sterol, are regulated, in part, at the transcriptional level. Two transcription factors, Upc2p and Ecm22p, bind to the promoters of most ergosterol biosynthetic (ERG) genes, including ERG2 and ERG3, and activate these genes upon sterol depletion. We have identified the transcriptional activation domains of Upc2p and Ecm22p and found that UPC2-1, a mutation that allows cells to take up sterols aerobically, increased the potency of the activation domain. The equivalent mutation in ECM22 also greatly enhanced transcriptional activation. The C-terminal regions of Upc2p and Ecm22p, which contained activation domains, also conferred regulation in response to sterol levels. Hence, the activation and regulatory domains of these proteins overlapped. However, the two proteins differed markedly in how they respond to an increased need for sterols. Upon inducing conditions, Upc2p levels increased, and chromatin immunoprecipitation experiments revealed more Upc2p at promoters even when the activation/regulatory domains were tethered to a different DNA-binding domain. However, induction resulted in decreased Ecm22p levels and a corresponding decrease in the amount of Ecm22p bound to promoters. Thus, these two activators differ in their contributions to the regulation of their targets.

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Crossref · 10.1128/mcb.25.16.7375-7385.2005

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  • G898D UPC2A behaves as a hyperactive transcriptional activator in C. glabrata, as previously seen for G888D Upc2 in S. cerevisiae.

    “This is consistent with G898D UPC2A behaving as a hyperactive transcriptional activator in C. glabrata as has previously been seen for G888D Upc2 in S. cerevisiae [25].”
  • At the same time, the levels of Upc2, and their association to ERG promoters, strongly increase, which finally results in the transcriptional induction of ERG genes.

    “At the same time, the levels of Upc2, and their association to ERG promoters, strongly increase, which finally results in the transcriptional induction of ERG genes [68,74].”
  • Upon low sterol levels, the abundance of Ecm22 protein, and consequently its binding to ERG promoters, decreases in a process that involves its direct physical interaction with the repressor Mot3.

    “Upon low sterol levels, the abundance of Ecm22 protein, and consequently its binding to ERG promoters, decreases in a process that involves its direct physical interaction with the repressor Mot3 (Figure 3B) [74,75].”
  • Upon ergosterol depletion, the dissociation of the sterol ligand causes a conformational change that exposes Upc2 NLS, causing its translocation to the nucleus, where it activates the transcription of SRE/AR1c-containing genes including most ERG genes, sterol uptake genes (AUS1, PDR11), the DAN/TIR genes, and members of the PAU gene family.

    “Upon ergosterol depletion, the dissociation of the sterol ligand causes a conformational change that exposes Upc2 NLS, causing its translocation to the nucleus, where it activates the transcription of SRE/AR1c-containing genes including most ERG genes, sterol uptake genes (AUS1, PDR11), the DAN/TIR genes, which encode nine cell wall mannoproteins, and members of the seripauperin (PAU) gene family”

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Authors
Davies, B. S. J., Wang, H. S., & Rine, J.
Affiliations
University of California, Berkeley (US)
Corresponding author
Rine, Jasper
Venue
Molecular and Cellular Biology
Published
2005-08
Volume
25
Issue
16
Pages
7375-7385
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2110895138
Cited by
138
References
42
Citations by year
2026: 4 · 2025: 4 · 2024: 9 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 5 · 2019: 4 · 2018: 5 · 2017: 9 · 2016: 3 · 2015: 5 · 2014: 5 · 2013: 12 · 2012: 7
FWCI
2.99
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institute of General Medical Sciences (R01GM035827, T32GM007232)
  • National Institute of Environmental Health Sciences (T32ES007075)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
sterol biosynthesis, ergosterol, transactivation domain, transcriptional regulation, ERG gene, sterol depletion, promoter binding, Saccharomyces cerevisiae, transcription factors
MeSH terms
beta-Galactosidase, DNA, Ergosterol, Lac Operon, Models, Biological, Models, Chemical, Models, Genetic, Plasmids, Protein Binding, Recombinant Fusion Proteins, Saccharomyces cerevisiae, Sterols, Transcription Factors, Transcription, Genetic, Transcriptional Activation, Trans-Activators, Protein Structure, Tertiary, Genes, Reporter, Saccharomyces cerevisiae Proteins, Chromatin Immunoprecipitation

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