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Phosphorylation of p53 at threonine 155 is required for Jab1-mediated nuclear export of p53

  • Lee, Eun-Woo (Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)) ;
  • Oh, Wonkyung (DNA Repair Research Center, Chosun University School of Medicine) ;
  • Song, Hosung Paul (Korea International School) ;
  • Kim, Won Kon (Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB))
  • Received : 2017.05.11
  • Accepted : 2017.05.25
  • Published : 2017.07.31

Abstract

The Jun activation-domain binding protein 1 (Jab1) induces p53 nuclear export and cytoplasmic degradation, but the underlying mechanism is poorly understood. Here, we show that phosphorylation at the threonine 155 residue is essential for Jab1-mediated p53 nuclear export. Jab1 stimulated phosphorylation of p53 at T155 was inhibited by curcumin, an inhibitor of COP9 signalosome (CSN)-associated kinases. The T155E mutant, which mimics phosphorylated p53, exhibited spontaneous cytoplasmic localization in the absence of Jab1. This process was prevented by leptinomycin B (LMB), but not by curcumin. The substitution of threonine 155 for valine (T155V) abrogated Jab1-mediated p53 nuclear export, indicating that phosphorylation at this site is essential for Jab1-mediated regulation of p53. Although T155E can be localized in the cytoplasm in the absence of Mdm2, the translocation of T155E was significantly enhanced by ectopic Hdm2 expression. Our data suggests that Jab1-mediated phosphorylation of p53 at Thr155 residue mediates nuclear export of p53.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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