In vivo effects of abolishing the Single canonical sumoylation site in the C-terminal region of Drosophila p53

Abstract

Using yeast two-hybrid screens we determined that Drosophila (Dm)p53 interacts with proteins involved in sumoylation (UBA2, UBC9 and PIAS) through different regions of its C-terminal domain. A K302R point mutation within a single canonical sumoylation site of Dmp53 did not abolish the observed interactions. These observations prompted us to analyze whether Dmp53 sumoylation at this site has any functional role in vivo. Genetic assays showed that deleting one copy of genes involved in sumoylation (lwr, Su(var)2–10 or smt3 heterozygosity) enhanced slightly the mutator phenotype of Dmp53. We compared the in vivo effects of wild type and K302R Dmp53 overproduced from transgenes and determined that similar levels of expression of the mutant and wild type proteins resulted in similar phenotype, and the two proteins showed similar cellular localization. The half life and the trans-activator activity of K302R mutant and wild type Dmp53 were also comparable. Lastly, by analyzing wild type and K302R Dmp53 expressed at different levels in animals and in S2 cells we detected no differences between the mobility of the mutant and wild-type protein. From these data we conclude that under normal developmental conditions the loss of SUMO modification at K302 does not affect Dmp53 function significantly.

Abbreviations

BLAST:

Basic Local Alignment Search Tool

FACS:

fluorescence activated cell sorting

GST:

gluthation S-transferase

mwh:

multiple wing hair

TULLH:

Trp-, Ura-, Leu-, Lys-, His-

Y2H:

yeast two-hybrid

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Correspondence to I. M. Boros.

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Pardi, N., Vámos, E., Ujfaludi, Z. et al. In vivo effects of abolishing the Single canonical sumoylation site in the C-terminal region of Drosophila p53. BIOLOGIA FUTURA 62, 397–412 (2011). https://doi.org/10.1556/ABiol.62.2011.4.6

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Keywords

  • p53
  • SUMO
  • apoptosis
  • Drosophila
  • yeast two hybrid