Cited by 92DNA Repair MechanismsMicrotubule and mitosis dynamicsCancer-related Molecular Pathways

Tipin is required for stalled replication forks to resume DNA replication after removal of aphidicolin in Xenopus egg extracts

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Errico, Alessia, Costanzo, Vincenzo, Hunt, Tim·2007·Proceedings of the National Academy of Sciences

Abstract

Tipin and its interacting partner Tim1 (Timeless) form a complex at replication forks that plays an important role in the DNA damage checkpoint response. Here we identify Xenopus laevis Tipin as a substrate for cyclin E/cyclin-dependent kinases 2 that is phosphorylated in interphase and undergoes further phosphorylation upon entry into mitosis. During unperturbed DNA replication, the Tipin/Tim1 complex is bound to chromatin, and we were able to detect interactions between Tipin and the MCM helicase. Depletion of Tipin from Xenopus extracts did not significantly impair normal replication but substantially blocked the ability of stalled replication forks to recover after removal of a block imposed by aphidicolin. Tipin-depleted extracts also showed defects in the activation of Chk1 in response to aphidicolin, probably because of a failure to load the checkpoint mediator protein Claspin onto chromatin.

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  1. [10]Takai H, Tominaga K, Motoyama N, Minamishima YA, Nagahama H, Tsukiyama T, Ikeda K, Nakayama K, Nakanishi M, Nakayama K. Genes Dev. 2000;14:1439–1447. [PMC free article] [PubMed] [Google Scholar]
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Authors
Errico, A., Costanzo, V., & Hunt, T.
Affiliations
Cancer Research UK (GB)
Corresponding author
Hunt, Tim
Venue
Proceedings of the National Academy of Sciences
Published
2007-09-18
Volume
104
Issue
38
Pages
14929-14934
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2037887345
Cited by
92
References
64
Citations by year
2025: 1 · 2024: 1 · 2022: 2 · 2021: 2 · 2020: 4 · 2019: 2 · 2018: 1 · 2017: 5 · 2016: 5 · 2015: 6 · 2014: 9 · 2013: 9 · 2012: 6
FWCI
4.10
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Cancer Research UK
  • European Commission
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
Keywords
TIPIN, TIM-1, TIMELESS, DNA replication restart, aphidicolin, MCM helicase, Chk1 activation, Claspin, DNA damage checkpoint, Xenopus egg extracts
MeSH terms
Checkpoint Kinase 1, Animals, Carrier Proteins, Chromatin, DNA Damage, DNA Replication, DNA-Binding Proteins, Enzyme Inhibitors, Ovum, Phosphorylation, Protein Kinases, Xenopus laevis, S Phase, Aphidicolin, Cell Cycle Proteins, Cyclin E, Xenopus Proteins, Adaptor Proteins, Signal Transducing, Cyclin-Dependent Kinase 2

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