Cited by 88Fungal and yeast genetics researchBacterial Genetics and BiotechnologyGenomics and Chromatin Dynamics

Synergistic repression of anaerobic genes by Mot3 and Rox1 in Saccharomyces cerevisiae

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Sertil, O.·2003·Nucleic Acids Research

Abstract

Two groups of anaerobic genes (genes induced in anaerobic cells and repressed in aerobic cells) are negatively regulated by heme, a metabolite present only in aerobic cells. Members of both groups, the hypoxic genes and the DAN/TIR/ERG genes, are jointly repressed under aerobic conditions by two factors. One is Rox1, an HMG protein, and the second, originally designated Rox7, is shown here to be Mot3, a global C2H2 zinc finger regulator. Repression of anaerobic genes results from co-induction of Mot3 and Rox1 in aerobic cells. Repressor synthesis is triggered by heme, which de-represses a mechanism controlling expression of both MOT3 and ROX1 in anaerobic cells; it includes Hap1, Tup1, Ssn6 and a fourth unidentified factor. The constitutive expression of various anaerobic genes in aerobic rox1Delta or mot3Delta cells directly implies that neither factor can repress by itself at endogenous levels and that stringent aerobic repression results from the concerted action of both. Mot3 and Rox1 are not essential components of a single complex, since each can repress independently in the absence of the other, when artificially induced at high levels. Moreover, the two repression mechanisms appear to be distinct: as shown here repression of ANB1 by Rox1 alone requires Tup1-Ssn6, whereas repression by Mot3 does not. Though artificially high levels of either factor can repress well, the absolute efficiency observed in normal cells when both are present-at much lower levels-demonstrates a novel inhibitory synergy. Evidently, expression levels for the two mutually dependent repressors are calibrated to permit a range of variation in basal aerobic expression at different promoters with differing operator site combinations.

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  • Mot3 represses the expression of hypoxic, DAN/TIR/PAU and ERG genes including ERG2, ERG6 and ERG9.

    “In addition, to limit Ecm22 function [75], the transcriptional factor Mot3 also represses the expression of hypoxic, DAN/TIR/PAU and ERG genes including ERG2, ERG6 and ERG9 (Figure 3A) [86,89,90,91,92,93].”
  • Rox1 and Mot3 regulatory factors act synergistically to achieve stringent repression of target genes.

    “Rox1 and Mot3 regulatory factors act synergistically to achieve stringent repression of target genes [89,90].”

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Authors
Sertil, O.
Affiliations
Albany Medical College (US)
Corresponding author
Sertil, O.
Venue
Nucleic Acids Research
Published
2003-10-15
Volume
31
Issue
20
Pages
5831-5837
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2023135280
Cited by
88
References
33
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2022: 6 · 2021: 2 · 2020: 6 · 2019: 3 · 2018: 1 · 2017: 4 · 2015: 2 · 2014: 2 · 2013: 7 · 2012: 4
FWCI
1.84
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Science Foundation
Topics
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
roX1, heme regulation, C2H2 zinc finger transcription factor, high mobility group proteins, HAP1, transcriptional synergy, Saccharomyces cerevisiae
MeSH terms
Aerobiosis, Anaerobiosis, DNA-Binding Proteins, Dose-Response Relationship, Drug, Glycoproteins, Heme, Mutation, Nuclear Proteins, Oxygen, Repressor Proteins, RNA, Fungal, Saccharomyces cerevisiae, Transcription Factors, Gene Expression Regulation, Fungal, Saccharomyces cerevisiae Proteins

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