Studying p53 family proteins in yeast: Induction of autophagic cell death and modulation by interactors and small molecules

Mariana Leão, Sara Gomes, Cláudia Bessa, Joana Soares, Liliana Raimundo, Paola Monti, Gilberto Fronza, Clara Pereira, Lucília Saraiva

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


In this work, the yeast Saccharomyces cerevisiae was used to individually study human p53, p63 (full length and truncated forms) and p73. Using this cell system, the effect of these proteins on cell proliferation and death, and the influence of MDM2 and MDMX on their activities were analyzed. When expressed in yeast, wild-type p53, TAp63, δNp63 and TAp73 induced growth inhibition associated with S-phase cell cycle arrest. This growth inhibition was accompanied by reactive oxygen species production and autophagic cell death. Furthermore, they stimulated rapamycin-induced autophagy. On the contrary, none of the tested p53 family members induced apoptosis either per se or after apoptotic stimuli. As previously reported for p53, also TAp63, δNp63 and TAp73 increased actin expression levels and its depolarization, suggesting that ACT1 is also a p63 and p73 putative yeast target gene. Additionally, MDM2 and MDMX inhibited the activity of all tested p53 family members in yeast, although the effect was weaker on TAp63. Moreover, Nutlin-3a and SJ-172550 were identified as potential inhibitors of the p73 interaction with MDM2 and MDMX, respectively. Altogether, the yeast-based assays herein developed can be envisaged as a simplified cell system to study the involvement of p53 family members in autophagy, the modulation of their activities by specific interactors (MDM2 and MDMX), and the potential of new small molecules to modulate these interactions.

Original languageEnglish
Pages (from-to)164-177
Number of pages14
JournalExperimental Cell Research
Issue number1
Early online date28 Sept 2014
Publication statusPublished - 1 Jan 2015


  • Autophagy
  • MDM2
  • MDMX
  • P53 family members
  • Yeast

ASJC Scopus subject areas

  • Cell Biology


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