Cited by 137DNA Repair MechanismsCancer-related Molecular PathwaysMicrotubule and mitosis dynamics

Chk1, but not Chk2, inhibits Cdc25 phosphatases by a novel common mechanism.

Open access
Uto, Katsuhiro, Inoue, Daigo, Shimuta, Ken, Nakajo, Nobushige, Sagata, Noriyuki·2004·The EMBO Journal

Abstract

Cdc25 phosphatases activate cyclin-dependent kinases (Cdks) and thereby promote cell cycle progression. In vertebrates, Chk1 and Chk2 phosphorylate Cdc25A at multiple N-terminal sites and target it for rapid degradation in response to genotoxic stress. Here we show that Chk1, but not Chk2, phosphorylates Xenopus Cdc25A at a novel C-terminal site (Thr504) and inhibits it from C-terminally interacting with various Cdk-cyclin complexes, including Cdk1-cyclin A, Cdk1-cyclin B, and Cdk2-cyclin E. Strikingly, this inhibition, rather than degradation itself, of Cdc25A is essential for the Chk1-induced cell cycle arrest and the DNA replication checkpoint in early embryos. 14-3-3 proteins bind to Chk1-phosphorylated Thr504, but this binding is not required for the inhibitory effect of Thr504 phosphorylation. A C-terminal site presumably equivalent to Thr504 exists in all known Cdc25 family members from yeast to humans, and its phosphorylation by Chk1 (but not Chk2) can also inhibit all examined Cdc25 family members from C-terminally interacting with their Cdk-cyclin substrates. Thus, Chk1 but not Chk2 seems to inhibit virtually all Cdc25 phosphatases by a novel common mechanism.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1038/sj.emboj.7600328

Cites

47 of 47 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Chk1 phosphorylates Cdc25A, prompting its proteasomal degradation.

    “Chk1 then phosphorylates numerous downstream targets, including the Cdc25A phosphatase (Uto et al., 2004), which prompts Cdc25A proteasomal degradation (Mailand et al., 2000; Xiao et al., 2003).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Uto et al., 2004

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Uto, K., Inoue, D., Shimuta, K., Nakajo, N., & Sagata, N.
Affiliations
Kyushu University (JP)
Corresponding author
Sagata, Noriyuki
Venue
The EMBO Journal
Published
2004-07-22
Volume
23
Issue
16
Pages
3386-3396
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2050348418
Cited by
134
References
47
Citations by year
2026: 2 · 2025: 3 · 2024: 7 · 2023: 5 · 2022: 4 · 2021: 9 · 2020: 6 · 2019: 5 · 2018: 2 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 10 · 2013: 9 · 2012: 6
FWCI
3.56
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Japan Science and Technology Agency (CREST)
  • Core Research for Evolutional Science and Technology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
Keywords
Chk1, Chk2, CDC25A, Cdc25 phosphatase, cyclin-CDK complexes, CDK1/cyclin B, cyclin E/CDK2, DNA replication checkpoint, cell cycle arrest, 14-3-3 proteins, genotoxic stress, Xenopus embryo
MeSH terms
Checkpoint Kinase 1, Amino Acid Sequence, Animals, DNA Replication, Humans, Molecular Sequence Data, Mutation, Phosphorylation, Phosphothreonine, Protein Binding, Protein Kinases, Xenopus laevis, Cyclins, Sequence Alignment, Protein Serine-Threonine Kinases, cdc25 Phosphatases, Xenopus Proteins, 14-3-3 Proteins, Checkpoint Kinase 2

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review