Heavy metal sensitivities of gene deletion strains for ITT1 and RPS1A connect their activities to the expression of URE2, a key gene involved in metal detoxification in yeast

PLoS One. 2018 Sep 19;13(9):e0198704. doi: 10.1371/journal.pone.0198704. eCollection 2018.

Abstract

Heavy metal and metalloid contaminations are among the most concerning types of pollutant in the environment. Consequently, it is important to investigate the molecular mechanisms of cellular responses and detoxification pathways for these compounds in living organisms. To date, a number of genes have been linked to the detoxification process. The expression of these genes can be controlled at both transcriptional and translational levels. In baker's yeast, Saccharomyces cerevisiae, resistance to a wide range of toxic metals is regulated by glutathione S-transferases. Yeast URE2 encodes for a protein that has glutathione peroxidase activity and is homologous to mammalian glutathione S-transferases. The URE2 expression is critical to cell survival under heavy metal stress. Here, we report on the finding of two genes, ITT1, an inhibitor of translation termination, and RPS1A, a small ribosomal protein, that when deleted yeast cells exhibit similar metal sensitivity phenotypes to gene deletion strain for URE2. Neither of these genes were previously linked to metal toxicity. Our gene expression analysis illustrates that these two genes affect URE2 mRNA expression at the level of translation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Gene Deletion*
  • Gene Expression Regulation, Fungal
  • Glutathione Peroxidase / genetics*
  • Glutathione Peroxidase / metabolism
  • Inactivation, Metabolic
  • Metals, Heavy / metabolism*
  • Prions / genetics*
  • Prions / metabolism
  • Ribosomal Proteins / genetics*
  • Ribosomal Proteins / metabolism
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics*
  • Saccharomyces cerevisiae Proteins / metabolism
  • Ubiquitin-Conjugating Enzymes / genetics*
  • Ubiquitin-Conjugating Enzymes / metabolism

Substances

  • Metals, Heavy
  • Prions
  • RPS1A protein, S cerevisiae
  • Ribosomal Proteins
  • Saccharomyces cerevisiae Proteins
  • Glutathione Peroxidase
  • URE2 protein, S cerevisiae
  • ITT1 protein, S cerevisiae
  • Ubiquitin-Conjugating Enzymes

Grants and funding

This research was funded by Natural Sciences and Engineering Research Council of Canada, NSERC grant number: 123456.