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Related Experiment Videos

Replication checkpoint enforced by kinases Cds1 and Chk1

M N Boddy1, B Furnari, O Mondesert

  • 1Departments of Molecular Biology and Cell Biology, Scripps Research Institute, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|May 23, 1998
PubMed
Summary

Hydroxyurea (HU) triggers the Cds1 kinase, which inhibits cell division by affecting Wee1 and Mik1. Together, Cds1 and Chk1 enforce the DNA replication checkpoint in fission yeast.

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Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Yeast Genetics

Background:

  • The cell division cycle is tightly regulated by checkpoints ensuring proper DNA replication and repair before mitosis.
  • Cdc2 kinase activity, crucial for initiating mitosis, is controlled by regulatory proteins including phosphatases like Cdc25 and kinases like Wee1 and Mik1.
  • The DNA replication checkpoint prevents entry into mitosis if DNA replication is incomplete or damaged, but its specific effectors are not fully understood.

Purpose of the Study:

  • To identify the molecular effectors of the DNA replication checkpoint activated by hydroxyurea (HU) in fission yeast.
  • To elucidate the roles of Cds1 and Chk1 kinases in enforcing the replication checkpoint and regulating cell division.

Main Methods:

  • Treatment of fission yeast with hydroxyurea (HU) to induce replication stress.

Related Experiment Videos

  • Analysis of kinase activity (Cds1) and protein levels (Mik1) in response to HU.
  • Genetic analysis using cds1 and chk1 deletion mutants to assess their role in HU-induced cell cycle arrest.

    • Main Results:

    • Hydroxyurea treatment stimulated the protein kinase Cds1.
    • Cds1 activity was required for the HU-induced increase in Mik1 levels and appeared to phosphorylate the Wee1 kinase.
    • Absence of both Cds1 and Chk1 (cds1 chk1 cells) abolished the HU-induced cell division arrest, indicating their joint function.

    Conclusions:

    • Cds1 and Chk1 act in concert to enforce the DNA replication checkpoint in fission yeast.
    • Cds1 regulates cell division arrest under replication stress by influencing the inhibitory kinases Wee1 and Mik1.
    • These findings reveal key components of the replication checkpoint pathway, linking DNA replication status to cell cycle progression.