PreprintCited by 767DNA Repair MechanismsGenomics and Chromatin DynamicsBacterial Genetics and Biotechnology

Functional uncoupling of MCM helicase and DNA polymerase activities activates the ATR-dependent checkpoint

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Byun, Tony S., Pacek, Marcin, Yee, Muh-ching, Walter, Johannes C., Cimprich, Karlene A.·2005·Genes & Development

Abstract

The ATR-dependent DNA damage response pathway can respond to a diverse group of lesions as well as inhibitors of DNA replication. Using the Xenopus egg extract system, we show that lesions induced by UV irradiation and cis-platinum cause the functional uncoupling of MCM helicase and DNA polymerase activities, an event previously shown for aphidicolin. Inhibition of uncoupling during elongation with inhibitors of MCM7 or Cdc45, a putative helicase cofactor, results in abrogation of Chk1 phosphorylation, indicating that uncoupling is necessary for activation of the checkpoint. However, uncoupling is not sufficient for checkpoint activation, and DNA synthesis by Polα is also required. Finally, using plasmids of varying size, we demonstrate that all of the unwound DNA generated at a stalled replication fork can contribute to the level of Chk1 phosphorylation, suggesting that uncoupling amplifies checkpoint signaling at each individual replication fork. Taken together, these observations indicate that functional uncoupling of MCM helicase and DNA polymerase activities occurs in response to multiple forms of DNA damage and that there is a general mechanism for generation of the checkpoint-activating signal following DNA damage.

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  • Long single-stranded DNA can be generated by uncoupling MCM helicase and DNA polymerase during replication stress, by CtIP-mediated double-strand break end resection, by Exo1-mediated processing of nucleotide excision repair intermediates after UV, and by APE2-mediated single-strand break end resection in oxidative stress.

    “A long stretch of ssDNA can be generated through the functional uncoupling of minichromosome maintenance (MCM) helicase and DNA polymerase in DNA replication stress, the DSB end resection by DNA exonuclease such as CtIP in DSB response, the Exo1-mediated processing of NER intermediates after UV radiation, and the SSB end resection by AP endonuclease 2 (APE2) in oxidative stress [86, 97–99]”

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Authors
Byun, T. S., Pacek, M., Yee, M.-C., Walter, J. C., & Cimprich, K. A.
Affiliations
  • Stanford University (US)
  • Harvard University (US)
Corresponding author
Cimprich, Karlene A.
Venue
Genes & Development
Published
2005-04-15
Volume
19
Issue
9
Pages
1040-1052
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2029369774
Cited by
767
References
60
Citations by year
2026: 21 · 2025: 25 · 2024: 25 · 2023: 30 · 2022: 21 · 2021: 48 · 2020: 35 · 2019: 35 · 2018: 38 · 2017: 51 · 2016: 41 · 2015: 41 · 2014: 35 · 2013: 57 · 2012: 34
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM062193, R01GM062267, GM-62267, R01GM062193)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (2T32 HD 07249, T32HD007249)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
MCM helicase, DNA polymerase, DNA replication checkpoint, Chk1 phosphorylation, MCM7, Cdc45, replication fork stalling, UV-induced DNA damage, cisplatin, Xenopus egg extracts
MeSH terms
Checkpoint Kinase 1, Animals, Cell-Free System, Chromatin, DNA Damage, DNA-Directed DNA Polymerase, DNA Replication, DNA Helicases, DNA, Single-Stranded, Phosphorylation, Plasmids, Protein Kinases, Xenopus, Aphidicolin, Protein Serine-Threonine Kinases, DNA Primers, Cell Cycle Proteins, Xenopus Proteins, Adaptor Proteins, Signal Transducing, Ataxia Telangiectasia Mutated Proteins

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