Daxx-like protein of Drosophila interacts with Dmp53 and affects longevity and Ark mRNA level

László Bodai, Norbert Pardi, Zsuzsanna Újfaludi, Orsolya Bereczki, Orbán Komonyi, Eva Balint, Imre M. Boros

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Daxx-like protein (DLP), the Drosophila homolog of Daxx, binds Drosophila melanogaster p53 (Dmp53) through its C-terminal region. We generated DLP mutants and found that although DLP expression is developmentally regulated, it is not essential for the execution of the developmental program. The effects DLP mutations show in the loss of heterozygosity assay and on phenotypes resulting from Dmp53 overexpression indicate a genetic interaction between DLP and Dmp53. In contrast to Dmp53 mutants, however, loss of DLP does not result in radiosensitivity indicating that it does not play an essential role in the activation of Dmp53-dependent response after ionizing radiation, and DLP is also not required for the irradiation-induced activation of reaper. In contrast, DLP is involved in the transcriptional regulation of Ark, because Ark mRNA level is decreased in DLP mutants and increased upon ectopic overexpression of DLP. Interestingly, DLP mutants have reduced longevity and reduced female fertility. Altogether, our data suggest complex functions for DLP, which include an anti-apoptotic effect exerted through repression of some Dmp53 functions, and activation of some proapoptotic genes.

Original languageEnglish
Pages (from-to)36386-36393
Number of pages8
JournalJournal of Biological Chemistry
Volume282
Issue number50
DOIs
Publication statusPublished - Dec 14 2007

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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