When Phosphatases Go Mad: The Molecular Basis for Toxicity of Yeast Ppz1

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The fact that overexpression of the yeast Ser/Thr protein phosphatase Ppz1 induces a dramatic halt in cell proliferation was known long ago, but only work in the last few years has provided insight into the molecular basis for this toxicity. Overexpression of Ppz1 causes abundant changes in gene expression and modifies the phosphorylation state of more than 150 proteins, including key signaling protein kinases such as Hog1 or Snf1. Diverse cellular processes are altered: halt in translation, failure to properly adapt to low glucose supply, acidification of the cytosol, or depletion of intracellular potassium content are a few examples. Therefore, the toxicity derived from an excess of Ppz1 appears to be multifactorial, the characteristic cell growth blockage thus arising from the combination of various altered processes. Notably, overexpression of the Ppz1 regulatory subunit Hal3 fully counteracts the toxic effects of the phosphatase, and this process involves intracellular relocation of the phosphatase to internal membranes.

Original languageEnglish
Article number4304
Number of pages15
JournalInternational journal of molecular sciences
Issue number8
Publication statusPublished - 13 Apr 2022


  • Saccharomyces cerevisiae
  • intracellular signaling
  • pH homeostasis
  • phosphoproteomics
  • protein overexpression
  • protein phosphatases
  • transcriptomics
  • Phosphorylation
  • Saccharomyces cerevisiae/metabolism
  • Cell Cycle
  • Phosphoprotein Phosphatases/genetics
  • Saccharomyces cerevisiae Proteins/genetics


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