KSR1 is required for cell cycle reinitiation following DNA Damage

Gina L. Razidlo, Heidi J. Johnson, Scott M. Stoeger, Kenneth H Cowan, Tadayoshi Bessho, Robert E Lewis

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

KSR1 (kinase suppressor of Ras 1) is a molecular scaffold and positive regulator of the Raf/MEK/ERK phosphorylation cascade. KSR1 is required for maximal ERK activation induced by growth factors and by some cytotoxic agents.Weshow here that KSR1 is also required for maximal ERK activation induced by UV light, ionizing radiation, or the DNA interstrand cross-linking agent mitomycin C (MMC). We further demonstrate a role for KSR1 in the reinitiation of the cell cycle and proliferation following cell cycle arrest induced by MMC. Cells lacking KSR1 underwent but did not recover from MMC-induced G2/M arrest. Expression of KSR1 allowed KSR1-/- cells to re-enter the cell cycle following MMC treatment. However, cells expressing a mutated form of KSR1 unable to bind ERK did not recover from MMC-induced cell cycle arrest, demonstrating the requirement for the KSR1-ERK interaction. In addition, constitutive activation of ERK was not sufficient to promote cell cycle reinitiation in MMC-treated KSR1-/- cells. Only cells expressing KSR1 recovered from MMC-induced cell cycle arrest. Importantly, MMC-induced DNA damage was repaired in KSR1-/-cells, as determined by resolution of γ-H2AX-containing foci. These data indicate that cell cycle reinitiation is not actively signaled in the absence of KSR1, even when DNA damage has been resolved. These data reveal a specific role for the molecular scaffold KSR1 and KSR1-mediated ERK signaling in the cellular response to DNA interstrand cross-links.

Original languageEnglish (US)
Pages (from-to)6705-6715
Number of pages11
JournalJournal of Biological Chemistry
Volume284
Issue number11
DOIs
StatePublished - Mar 13 2009

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DNA Damage
Cell Cycle
Cells
Mitomycin
DNA
Cell Cycle Checkpoints
Chemical activation
KSR-1 protein kinase
Scaffolds
Phosphorylation
Ionizing radiation
Mitogen-Activated Protein Kinase Kinases
Cytotoxins
Cell proliferation
Ultraviolet Rays
Ionizing Radiation
Ultraviolet radiation
Intercellular Signaling Peptides and Proteins
Cell Proliferation

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

KSR1 is required for cell cycle reinitiation following DNA Damage. / Razidlo, Gina L.; Johnson, Heidi J.; Stoeger, Scott M.; Cowan, Kenneth H; Bessho, Tadayoshi; Lewis, Robert E.

In: Journal of Biological Chemistry, Vol. 284, No. 11, 13.03.2009, p. 6705-6715.

Research output: Contribution to journalArticle

Razidlo, Gina L. ; Johnson, Heidi J. ; Stoeger, Scott M. ; Cowan, Kenneth H ; Bessho, Tadayoshi ; Lewis, Robert E. / KSR1 is required for cell cycle reinitiation following DNA Damage. In: Journal of Biological Chemistry. 2009 ; Vol. 284, No. 11. pp. 6705-6715.
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