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Related Experiment Videos

Finishing the cell cycle.

B Novák1, A Tóth, A Csikász-Nagy

  • 1Department of Agricultural Chemical Technology, Technical University of Budapest, Gellért tér 4, Budapest, 1521, Hungary. bnovak@chem.bme.hu

Journal of Theoretical Biology
|July 9, 1999
PubMed
Summary
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Cell division cycle relies on cyclin-dependent kinases (Cdk) and inhibitors (CKI) to switch between G1 and S/G2/M states. A protein-phosphatase is crucial for cell cycle progression, particularly at the

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The eukaryotic cell cycle involves distinct G1 and S/G2/M phases, characterized by chromosome replication states.
  • Cyclin-dependent kinases (Cdk) and their regulators, APC and CKI, govern transitions between these cell cycle states.

Purpose of the Study:

  • To elucidate the biochemical kinetics driving transitions between cell cycle states.
  • To propose the role of protein-phosphatase in regulating cell cycle progression, specifically at the 'Finish' transition.

Main Methods:

  • Biochemical kinetics modeling to simulate cell cycle dynamics.
  • Analysis of antagonistic interactions between CDKs, APC, and CKI.

Main Results:

Related Experiment Videos

  • Demonstrated that antagonistic interactions between Cdk, APC, and CKI can generate the two stable cell cycle states (G1 and S/G2/M).
  • Showed that irreversible transitions between these states drive cell cycle progression.
  • Proposed a model where protein-phosphatase plays a key role at the 'Finish' transition by up-regulating APC and stabilizing CKI.

    • Conclusions:

    • Protein-phosphatase is essential for the 'Finish' transition, regulating exit from mitosis.
    • The phosphatase acts in parallel pathways, allowing cell cycle progression even if cyclin degradation or CKI stabilization is impaired.