SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase

Jianping Jin, Takahiro Shirogane, Lai Xu, Grzegorz Nalepa, Jun Qin, Stephen J. Elledge, J. Wade Harper

Research output: Contribution to journalArticle

259 Citations (Scopus)

Abstract

Eukaryotic cells respond to DNA damage and stalled replication forks by activating protein kinase-mediated signaling pathways that promote cell cycle arrest and DNA repair. A central target of the cell cycle arrest program is the Cdc25A protein phosphatase. Cdc25A is required for S-phase entry and dephosphorylates tyrosine-15 phosphorylated Cdk1 (Cdc2) and Cdk2, positive regulators of cell division. Cdc25A is unstable during S-phase and is degraded through the ubiquitin-proteasome pathway, but its turnover is enhanced in response to DNA damage. Although basal and DNA-damage-induced turnover depends on the ATM-Chk2 and ATR-Chk1 pathways, how these kinases engage the ubiquitin ligase machinery is unknown. Here, we demonstrate a requirement for SCF β-TRCP in Cdc25A turnover during an unperturbed cell cycle and in response to DNA damage. Depletion of β-TRCP stabilizes Cdc25A, leading to hyperactive Cdk2 activity. SCFβ-TRCP promotes Chk1-dependent Cdc25A ubiquitination in vitro, and this involves serine 76, a known Chk1 phosphorylation site. However, recognition of Cdc25A by β-TRCP occurs via a noncanonical phosphodegron in Cdc25A containing phosphoserine 79 and phosphoserine 82, sites that are not targeted by Chk1. These data indicate that Cdc25A turnover is more complex than previously appreciated and suggest roles for an additional kinase(s) in Chk1-dependent Cdc25A turnover.

Original languageEnglish (US)
Pages (from-to)3062-3074
Number of pages13
JournalGenes and Development
Volume17
Issue number24
DOIs
StatePublished - Dec 15 2003
Externally publishedYes

Fingerprint

cdc25 Phosphatases
Phosphoprotein Phosphatases
DNA Damage
Phosphoserine
Ubiquitin
Cell Cycle Checkpoints
S Phase
Ubiquitination
Eukaryotic Cells
Proteasome Endopeptidase Complex
Ligases
DNA Repair
Cell Division
Protein Kinases
Serine
Tyrosine
Cell Cycle
Phosphotransferases
Phosphorylation

Keywords

  • Cdc25A
  • Chk1
  • DNA damage
  • Protein turnover
  • SCF ubiquitin ligase

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

Cite this

Jin, J., Shirogane, T., Xu, L., Nalepa, G., Qin, J., Elledge, S. J., & Harper, J. W. (2003). SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase. Genes and Development, 17(24), 3062-3074. https://doi.org/10.1101/gad.1157503

SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase. / Jin, Jianping; Shirogane, Takahiro; Xu, Lai; Nalepa, Grzegorz; Qin, Jun; Elledge, Stephen J.; Harper, J. Wade.

In: Genes and Development, Vol. 17, No. 24, 15.12.2003, p. 3062-3074.

Research output: Contribution to journalArticle

Jin, J, Shirogane, T, Xu, L, Nalepa, G, Qin, J, Elledge, SJ & Harper, JW 2003, 'SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase', Genes and Development, vol. 17, no. 24, pp. 3062-3074. https://doi.org/10.1101/gad.1157503
Jin J, Shirogane T, Xu L, Nalepa G, Qin J, Elledge SJ et al. SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase. Genes and Development. 2003 Dec 15;17(24):3062-3074. https://doi.org/10.1101/gad.1157503
Jin, Jianping ; Shirogane, Takahiro ; Xu, Lai ; Nalepa, Grzegorz ; Qin, Jun ; Elledge, Stephen J. ; Harper, J. Wade. / SCFβ-TRCP links Chk1 signaling to degradation of the Cdc25A protein phosphatase. In: Genes and Development. 2003 ; Vol. 17, No. 24. pp. 3062-3074.
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