Cited by 43Fungal and yeast genetics researchEvolution and Genetic DynamicsMicrobial Metabolic Engineering and Bioproduction

Turbidostat culture of Saccharomyces cerevisiae W303-1A under selective pressure elicited by ethanol selects for mutations in SSD1 and UTH1

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Avrahami-Moyal, Liat, Engelberg, David, Wenger, Jared. W., Sherlock, Gavin, Braun, Sergei·2012·FEMS Yeast Research

Abstract

We investigated the genetic causes of ethanol tolerance by characterizing mutations selected in Saccharomyces cerevisiae W303-1A under the selective pressure of ethanol. W303-1A was subjected to three rounds of turbidostat, in a medium supplemented with increasing amounts of ethanol. By the end of selection, the growth rate of the culture has increased from 0.029 to 0.32 h(-1) . Unlike the progenitor strain, all yeast cells isolated from this population were able to form colonies on medium supplemented with 7% ethanol within 6 days, our definition of ethanol tolerance. Several clones selected from all three stages of selection were able to form dense colonies within 2 days on solid medium supplemented with 9% ethanol. We sequenced the whole genomes of six clones and identified mutations responsible for ethanol tolerance. Thirteen additional clones were tested for the presence of similar mutations. In 15 of 19 tolerant clones, the stop codon in ssd1-d was replaced with an amino acid-encoding codon. Three other clones contained one of two mutations in UTH1, and one clone did not contain mutations in either SSD1 or UTH1. We showed that the mutations in SSD1 and UTH1 increased tolerance of the cell wall to zymolyase and conclude that stability of the cell wall is a major factor in increased tolerance to ethanol.

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Crossref · 10.1111/j.1567-1364.2012.00803.x

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  • Selection for improved galactose utilization could be achieved by serial transfer with a 24% increase of μmax within 62 days, and galactose uptake rates and ethanol production were increased.

    “For other carbon sources, it was shown that selection for improved galactose utilization could be achieved by serial transfer with a 24% increase of μmax within 62 days. Galactose uptake rates and ethanol production were increased.”
  • Transcript analysis in galactose-evolved S. cerevisiae showed up-regulation of trehalose and glycogen metabolism, no mutations in galactose or storage carbohydrate related genes, and mutations in RAS/PKA signaling as a source for increased fitness on galactose medium.

    “Transcript analysis showed up-regulation of trehalose and glycogen metabolism, whereas no mutations were identified in galactose or storage carbohydrate related genes. Interestingly, the authors rather identified mutations in RAS/PKA signaling as a source for increased fitness on galactose medium [106].”
  • Yeast cells that were evolved for efficient galactose utilization subsequently showed trade-offs when grown on glucose as carbon source; this effect was due to antagonistic pleiotropy based on mutations of the regulatory protein RAS2.

    “Yeast cells that were evolved for efficient galactose utilization [106] subsequently showed trade-offs when grown on glucose as carbon source. This effect was due to antagonistic pleiotropy that was based on mutations of the regulatory protein RAS2[162].”

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Research works printed but not linked: 1

  1. Jimenez J Benitez T 1988 Selection of Ethanol-Tolerant Yeast Hybrids in pH-Regulated Continuous Culture Appl Environ Microbiol 54 917 922 16347613 PMC202573

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Authors
Avrahami-Moyal, L., Engelberg, D., Wenger, J. W., Sherlock, G., & Braun, S.
Affiliations
  • Department of Biological Chemistry; Institute of Life Sciences; The Hebrew University of Jerusalem; Jerusalem; Israel
  • Hebrew University of Jerusalem (IL)
  • Stanford Medicine (US)
Corresponding author
Braun, Sergei
Venue
FEMS Yeast Research
Published
2012-04-23
Volume
12
Issue
5
Pages
521-533
ISSN
1567-1356 (ISSN-L)
OpenAlex
W2098597173
Cited by
43
References
66
Citations by year
2026: 1 · 2025: 5 · 2024: 4 · 2023: 2 · 2022: 3 · 2021: 4 · 2020: 2 · 2019: 5 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 4 · 2014: 4 · 2013: 1 · 2012: 1
FWCI
1.28
Type
journal article
Language
en
Open access
Locations
  • FEMS Yeast Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Hebrew University of Jerusalem
  • National Institute of General Medical Sciences (T32GM007790, GM007790)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
ethanol tolerance, Saccharomyces cerevisiae, Ssd1, selection pressure, cell wall stability, zymolyase, growth rate, yeast cell wall
MeSH terms
Ethanol, Cell Wall, Culture Media, DNA Mutational Analysis, Glucan Endo-1,3-beta-D-Glucosidase, Heat-Shock Proteins, Membrane Proteins, Saccharomyces cerevisiae, Selection, Genetic, Genome, Fungal, Sequence Analysis, DNA, Mutation, Missense, Mitochondrial Proteins, Saccharomyces cerevisiae Proteins

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