USP29 controls the stability of checkpoint adaptor Claspin by deubiquitination

The DNA damage checkpoint is essential for the maintenance of genome integrity after genotoxic stress, and also for cell survival in eukaryotes. Claspin has a key role in the ATR (ATM and Rad3-related)-Chk1 branch of the DNA damage checkpoint and is also required for correct DNA replication. To achi...

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Bibliographic Details
Published in:Oncogene 2015-02, Vol.34 (8), p.1058-1063
Main Authors: Martín, Y, Cabrera, E, Amoedo, H, Hernández-Pérez, S, Domínguez-Kelly, R, Freire, R
Format: Article
Language:English
Subjects:
Adaptor Proteins, Signal Transducing - metabolism
Cancer
Cell survival
Cellular proteins
Checkpoint Kinase 1
CHK1 protein
Deoxyribonucleic acid
DNA
DNA biosynthesis
DNA damage
DNA replication
DNA Replication - genetics
Genetic aspects
Genetic research
Genomes
Genotoxicity
HEK293 Cells
Humans
Peptidase
Phosphorylation
Properties
Proteasomes
Protein Kinases - metabolism
Protein Processing, Post-Translational - genetics
Protein Stability
Proteolysis
Replication
Studies
Tumor Cells, Cultured
Ubiquitin
Ubiquitin Thiolesterase - metabolism
Ubiquitin-proteasome system
Ubiquitin-Specific Peptidase 7
Ubiquitin-Specific Proteases - genetics
Ubiquitin-Specific Proteases - physiology
Ubiquitination - genetics
Yeast
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Summary:The DNA damage checkpoint is essential for the maintenance of genome integrity after genotoxic stress, and also for cell survival in eukaryotes. Claspin has a key role in the ATR (ATM and Rad3-related)-Chk1 branch of the DNA damage checkpoint and is also required for correct DNA replication. To achieve properly these functions, Claspin is tightly regulated by ubiquitinin-dependent proteasomal degradation, which controls Claspin levels in a DNA-damage- and cell-cycle-dependent manner. Here, we identified a new regulator of Claspin, the ubiquitin-specific peptidase 29, USP29. Downregulation of USP29 destabilizes Claspin, whereas its overexpression promotes an increase in Claspin levels. USP29 interacts with Claspin and is able to deubiquitinate it both in vivo and in vitro. Most importantly, USP29 knockdown results in an impaired phosphorylation of Chk1 after DNA damage and USP29-depleted cells show a major defect in the S-phase progression. With these results, we identified USP29 as a new player in the ATR-Chk1 pathway and the control of DNA replication.
ISSN:0950-9232
1476-5594
DOI:10.1038/onc.2014.38