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Regulation of mitotic inhibitor Mik1 helps to enforce the DNA damage checkpoint

Academic Article
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Overview

related to degree

  • Baber-Furnari, Beth Anne, Ph.D. in Biology, Scripps Research 1994 - 1999

authors

  • Baber-Furnari, Beth Anne
  • Rhind, N.
  • Boddy, Michael
  • Shanahan, P.
  • Lopez-Girona, A.
  • Russell, Paul

publication date

  • January 2000

journal

  • Molecular Biology of the Cell  Journal

abstract

  • The protein kinase Chk1 enforces the DNA damage checkpoint. This checkpoint delays mitosis until damaged DNA is repaired. Chk1 regulates the activity and localization of Cdc25, the tyrosine phosphatase that activates the cdk Cdc2. Here we report that Mik1, a tyrosine kinase that inhibits Cdc2, is positively regulated by the DNA damage checkpoint. Mik1 is required for checkpoint response in strains that lack Cdc25. Long-term DNA damage checkpoint arrest fails in Deltamik1 cells. DNA damage increases Mik1 abundance in a Chk1-dependent manner. Ubiquitinated Mik1 accumulates in a proteasome mutant, which indicates that Mik1 normally has a short half-life. Thus, the DNA damage checkpoint might regulate Mik1 degradation. Mik1 protein and mRNA oscillate during the unperturbed cell cycle, with peak amounts detected around S phase. These data indicate that regulation of Mik1 abundance helps to couple mitotic onset to the completion of DNA replication and repair. Coordinated negative regulation of Cdc25 and positive regulation of Mik1 ensure the effective operation of the DNA damage checkpoint.

subject areas

  • CDC2 Protein Kinase
  • Cell Cycle
  • Cell Cycle Proteins
  • Cell Nucleus
  • Cysteine Endopeptidases
  • DNA Damage
  • DNA Replication
  • DNA, Fungal
  • Fungal Proteins
  • G2 Phase
  • Glutathione Transferase
  • Mitosis
  • Multienzyme Complexes
  • Mutagenesis
  • Proteasome Endopeptidase Complex
  • Protein Kinases
  • Protein-Tyrosine Kinases
  • RNA, Messenger
  • Recombinant Fusion Proteins
  • Schizosaccharomyces
  • Schizosaccharomyces pombe Proteins
  • Signal Transduction
  • Ubiquitins
  • ras-GRF1
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Identity

PubMed Central ID

  • PMC14752

International Standard Serial Number (ISSN)

  • 1059-1524

Digital Object Identifier (DOI)

  • 10.1091/mbc.11.1.1

PubMed ID

  • 10637286
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Additional Document Info

start page

  • 1

end page

  • 11

volume

  • 11

issue

  • 1

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