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J Biol Chem. 2016 Jan 8;291(2):959-67. doi: 10.1074/jbc.M114.624478. Epub 2015 Oct 27.

USP11 Is a Negative Regulator to γH2AX Ubiquitylation by RNF8/RNF168.

Author information

1
From the Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function and.
2
the Department of Genetics, Peking University Health Science Center, Beijing, 100191, China and.
3
the Institute for Cancer Genetics, and Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032.
4
From the Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function and erin3163@163.com zhao6025729@bjmu.edu.cn.

Abstract

Ubiquitin modification at double strand breaks (DSB) sites is an essential regulator of signaling and repair. γH2AX extends from DSB sites and provides a platform for subsequent recruitment and amplification of DNA repair proteins and signaling factors. Here, we found that RNF8/RNF168 ubiquitylates γH2AX. We identified that USP11 is a unique deubiquitylation enzyme for γH2AX. USP11 deubiquitylates γH2AX both in vivo and in vitro but not the canonical (ub)-K119-H2A and (ub)-K120-H2B in vitro, and USP11 ablation enhances the levels of γH2AX ubiquitylation. We also found that USP11 interacts with γH2AX both in vivo and in vitro. We found that 53BP1 and ubiquitin-conjugated proteins are misregulated to be retained longer and stronger at DSB sites after knockdown of USP11. We further found that cells are hypersensitive to γ-irradiation after ablation of USP11. Together, our findings elucidate deeply and extensively the mechanism of RNF8/RNF168 and USP11 to maintain the proper status of ubiquitylation γH2AX to repair DSB.

KEYWORDS:

E3 ubiquitin-protein ligase RNF8 (RNF8); H2A histone family, member X (H2AFX); deubiquitylation (deubiquitination); ubiquitin-dependent protease; ubiquitylation (ubiquitination)

PMID:
26507658
PMCID:
PMC4705413
DOI:
10.1074/jbc.M114.624478
[Indexed for MEDLINE]
Free PMC Article

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