Positive feedback regulation of p53 transactivity by DNA damage-induced ISG15 modification

Jong Ho Park, Seung Wook Yang, Jung Mi Park, Seung Hyeun Ka, Ji-Hoon Kim, Young-Yun Kong, Young Joo Jeon, Jae Hong Seol () and Chin Ha Chung ()
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Jong Ho Park: School of Biological Sciences, College of Natural Sciences, Seoul National University
Seung Wook Yang: School of Biological Sciences, College of Natural Sciences, Seoul National University
Jung Mi Park: School of Biological Sciences, College of Natural Sciences, Seoul National University
Seung Hyeun Ka: School of Biological Sciences, College of Natural Sciences, Seoul National University
Ji-Hoon Kim: School of Biological Sciences, College of Natural Sciences, Seoul National University
Young-Yun Kong: School of Biological Sciences, College of Natural Sciences, Seoul National University
Young Joo Jeon: Institute of Medical Science, Chungnam National University School of Medicine
Jae Hong Seol: School of Biological Sciences, College of Natural Sciences, Seoul National University
Chin Ha Chung: School of Biological Sciences, College of Natural Sciences, Seoul National University

Nature Communications, 2016, vol. 7, issue 1, 1-13

Abstract: Abstract p53 plays a pivotal role in tumour suppression under stresses, such as DNA damage. ISG15 has been implicated in the control of tumorigenesis. Intriguingly, the expression of ISG15, UBE1L and UBCH8 is induced by DNA-damaging agents, such as ultraviolet and doxorubicin, which are known to induce p53. Here, we show that the genes encoding ISG15, UBE1L, UBCH8 and EFP, have the p53-responsive elements and their expression is induced in a p53-dependent fashion under DNA damage conditions. Furthermore, DNA damage induces ISG15 conjugation to p53 and this modification markedly enhances the binding of p53 to the promoters of its target genes (for example, CDKN1 and BAX) as well as of its own gene by promoting phosphorylation and acetylation, leading to suppression of cell growth and tumorigenesis. These findings establish a novel feedback circuit between p53 and ISG15-conjugating system for positive regulation of the tumour suppressive function of p53 under DNA damage conditions.

Date: 2016
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DOI: 10.1038/ncomms12513

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