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Deubiquitinase OTUD5 mediates the sequential activation of PDCD5 and p53 in response to genotoxic stress

 Soo-Yeon Park  ;  Hyo-Kyoung Choi  ;  Youngsok Choi  ;  Sungmin Kwak  ;  Kyung-Chul Choi  ;  Ho-Geun Yoon 
 CANCER LETTERS, Vol.357(1) : 419-427, 2015 
Journal Title
Issue Date
Animals ; Apoptosis/physiology ; Apoptosis Regulatory Proteins/genetics ; Apoptosis Regulatory Proteins/metabolism* ; Cell Line, Tumor ; Colorectal Neoplasms/drug therapy ; Colorectal Neoplasms/genetics ; Colorectal Neoplasms/metabolism* ; DNA Damage ; Endopeptidases/genetics ; Endopeptidases/metabolism* ; Etoposide/pharmacology ; Gene Knockdown Techniques ; HCT116 Cells ; Humans ; Lung Neoplasms/drug therapy ; Lung Neoplasms/genetics ; Lung Neoplasms/metabolism* ; Mice ; Neoplasm Proteins/genetics ; Neoplasm Proteins/metabolism* ; Signal Transduction ; Stress, Physiological/genetics ; Stress, Physiological/physiology* ; Transcriptional Activation ; Transfection ; Tumor Suppressor Protein p53/genetics ; Tumor Suppressor Protein p53/metabolism* ; Ubiquitination
Cell death ; Genotoxic stress response ; OTUD5 ; PDCD5 ; p53
Programmed cell death 5 (PDCD5) positively regulates p53-mediated apoptosis and rapidly accumulates upon DNA damage. However, the underlying mechanism of PDCD5 upregulation during the DNA damage response remains unknown. Here, we found that OTU deubiquitinase 5 (OTUD5) was bound to PDCD5 in response to etoposide treatment and increased the stability of PDCD5 by mediating deubiquitination of PDCD5 at Lys-97/98. Overexpression of OTUD5 efficiently enhanced the activation of both PDCD5 and p53. Conversely, PDCD5 knockdown greatly attenuated the effect of OTUD5 on p53 activation. In addition, when OTUD5 was depleted, PDCD5 failed to facilitate p53 activation, demonstrating an essential role for the PDCD5-OTUD5 network in p53 activation. Importantly, we found that OTUD5-dependent PDCD5 stabilization was required for sequential activation of p53 in response to genotoxic stress. The sequential activation of PDCD5 and p53 was abrogated by knockdown of OTUD5. Finally, impairment of the genotoxic stress response upon PDCD5 ablation was substantially rescued by reintroducing PDCD5(WT) but not PDCD5(E94D) (defective for OTUD5 interaction) or PDCD5(E16D) (defective for p53 interaction). Together, our findings have uncovered an apoptotic signaling cascade linking PDCD5, OTUD5, and p53 during genotoxic stress responses.
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1. College of Medicine (의과대학) > Dept. of Biochemistry and Molecular Biology (생화학-분자생물학교실) > 1. Journal Papers
Yonsei Authors
Park, Soo Yeon(박수연) ORCID logo https://orcid.org/0000-0003-3743-9554
Yoon, Ho Geun(윤호근) ORCID logo https://orcid.org/0000-0003-2718-3372
Choi, Hyo Kyoung(최효경)
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