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Related Experiment Videos

Cdk2-dependent and -independent pathways in E2F-mediated S phase induction.

Y Arata1, M Fujita, K Ohtani

  • 1Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.

The Journal of Biological Chemistry
|February 29, 2000
PubMed
Summary
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The transcription factor E2F initiates DNA replication by activating two distinct pathways. One pathway requires cyclin-dependent kinase 2 (Cdk2) activity, while the other does not, revealing new insights into cell cycle regulation.

Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • DNA Replication

Background:

  • The transcription factor E2F is crucial for the G(1) to S phase transition in eukaryotic cell cycles.
  • While E2F-inducible genes are known, the precise molecular mechanisms linking E2F to S phase entry require further elucidation.
  • Understanding these pathways is key to comprehending DNA replication initiation.

Purpose of the Study:

  • To investigate the molecular mechanisms by which E2F-1 mediates the initiation of chromosomal DNA replication.
  • To identify the specific downstream pathways activated by E2F-1 that lead to S phase entry.
  • To differentiate the roles of Cdk2 and other factors in E2F-1-induced DNA replication.

Main Methods:

  • Generated stably transfected mouse NIH3T3 cells expressing human E2F-1 under a metallothionein promoter.

Related Experiment Videos

  • Analyzed G(1) to S phase progression, cyclin and Cdk activity, and the chromatin association of replication proteins.
  • Utilized Cdk inhibitory proteins (p27, p18, p19) and a Cdk-specific inhibitor (butyrolactone I).

    • Main Results:

    • Ectopic E2F-1 expression induced G(1) progression and S phase entry, with induced expression of cyclin E and activation of Cdk2.
    • Cdk2 activity, but not Cdk4, was essential for E2F-1-mediated S phase entry.
    • Ectopic E2F-1 expression was required for the chromatin association of Minichromosome maintenance proteins (MCM) 4 and 7, and induced expression and chromatin binding of Cdc45.
    • Cdk2 activity was necessary for Cdc45 chromatin binding but not for Cdc45 expression or MCM4/7 chromatin binding.

    Conclusions:

    • E2F-1 initiates S phase through at least two distinct downstream pathways.
    • One pathway is dependent on Cdk2 activity, likely for Cdc45 recruitment to chromatin.
    • The second pathway is independent of Cdk2 activity, potentially regulating MCM4 and MCM7 chromatin association.