PreprintCited by 111DNA Repair MechanismsUbiquitin and proteasome pathwaysGenomics and Chromatin Dynamics

Chk1 and Claspin potentiate PCNA ubiquitination

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Yang, Xiaohong H., Shiotani, Bunsyo, Classon, Marie, Zou, Lee·2008·Genes & Development

Abstract

Chk1 is a kinase crucial for genomic integrity and an effector of ATR (ATM and Rad3-realated) in DNA damage response. Here, we show that Chk1 regulates the DNA damage-induced ubiquitination of proliferating cell nuclear antigen (PCNA), which facilitates the continuous replication of damaged DNA. Surprisingly, this Chk1 function requires the DNA replication protein Claspin but not ATR. Claspin, which is stabilized by Chk1, regulates the binding of the ubiquitin ligase Rad18 to chromatin. Timeless, a Claspin-associating protein, is also required for efficient PCNA ubiquitination. Thus, Chk1 and the Claspin–Timeless module of replication forks not only participate in ATR signaling, but also protect stressed forks independently of ATR.

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Authors
Yang, X. H., Shiotani, B., Classon, M., & Zou, L.
Affiliations
Harvard University (US)
Venue
Genes & Development
Published
2008-05-01
Volume
22
Issue
9
Pages
1147-1152
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2156915836
Cited by
111
References
35
Citations by year
2025: 2 · 2024: 4 · 2023: 3 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 4 · 2018: 7 · 2017: 7 · 2016: 7 · 2015: 6 · 2014: 5 · 2013: 15 · 2012: 11
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Susan G. Komen for the Cure
  • Breast Cancer Alliance
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM076388, GM076388)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
Chk1, Claspin, PCNA ubiquitination, ATR signaling, DNA damage response, TIMELESS, replication fork, replication stress, genome stability
MeSH terms
Checkpoint Kinase 1, DNA Replication, HeLa Cells, Humans, Hydroxyurea, Morpholines, Plasmids, Protein Kinases, Pyrones, Transfection, Ultraviolet Rays, Blotting, Western, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Proliferating Cell Nuclear Antigen, RNA, Small Interfering, Cell Line, Tumor, Adaptor Proteins, Signal Transducing, Ubiquitination, Ataxia Telangiectasia Mutated Proteins

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