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Cell Death Differ. 2015 Jan;22(1):86-95. doi: 10.1038/cdd.2014.116. Epub 2014 Aug 22.

Genotoxic stress/p53-induced DNAJB9 inhibits the pro-apoptotic function of p53.

Author information

1
Department of Biochemistry and Molecular Biology, Kangwon National University School of Medicine, Chuncheon, South Korea.
2
Institute for Systems Biology, Seattle, WA, USA.
3
Department of Biochemistry, College of Medicine, Hallym University, Chuncheon, South Korea.
4
Department of Biochemistry, College of Medicine, Dankook University, Cheonan, South Korea.

Abstract

DNAJB9 is a recently isolated member of the molecular chaperone gene family, whose precise function is largely unknown. In the present study, we have identified DNAJB9 as an inducible gene of the tumor suppressor p53. DNAJB9 expression was induced by p53 or genotoxic stress in a p53-dependent manner, which was mediated by the Ras/Raf/ERK pathway. In addition, depletion of DNAJB9 by using siRNAs greatly increased genotoxic stress/p53-induced apoptosis, suggesting that DNAJB9 inhibits the pro-apoptotic function of p53. We also found that DNAJB9 physically interacts with p53 through its J domain, through which it inhibits the pro-apoptotic function of p53. Moreover, DNAJB9 colocalized with p53 in both cytoplasm and nucleus under genotoxic conditions. Together, these results demonstrate that DNAJB9 is a downstream target of p53 that belongs to the group of negative feedback regulators of p53.

PMID:
25146923
PMCID:
PMC4262772
DOI:
10.1038/cdd.2014.116
[Indexed for MEDLINE]
Free PMC Article

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