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Related Experiment Videos

Phosphorylation of E2F-1 by cyclin A-cdk2

M Kitagawa1, H Higashi, I Suzuki-Takahashi

  • 1Banyu Tsukuba Research Institute, Merck Research Laboratories, Japan.

Oncogene
|January 19, 1995
PubMed
Summary

Transcription factor E2F-1 is phosphorylated by cyclin A-cdk2 during the S phase, affecting its gene-binding activity. This phosphorylation event, occurring in vivo and in vitro, modulates E2F-1

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Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Transcription Factor Activity

Background:

  • Transcription factor E2F-1 plays a critical role in cell cycle progression.
  • E2F-1 is known to interact with cyclin-dependent kinases (CDKs).
  • Phosphorylation is a key post-translational modification regulating protein function.

Purpose of the Study:

  • To investigate the phosphorylation of E2F-1 by cyclin-dependent kinases.
  • To determine the biological functions of E2F-1 phosphorylation.
  • To elucidate the cell cycle-specific phosphorylation of E2F-1.

Main Methods:

  • Immunoprecipitation of E2F-1 from cell lysates.
  • In vitro phosphorylation assays using recombinant proteins (E2F-1, cyclins, CDKs).

Related Experiment Videos

  • In vivo phosphorylation analysis and phospho-peptide mapping.
  • Treatment with CDK inhibitor butyrolactone I.
  • Analysis of E2F-1 binding to the E2 promoter.

    • Main Results:

    • E2F-1 is efficiently phosphorylated by cyclin A-cdk2 in vitro.
    • Cyclin A-cdk2 phosphorylates E2F-1 more effectively than cyclin E-cdk2.
    • In vivo, E2F-1 phosphorylation occurs during the S phase, unlike pRB phosphorylation which starts at G1/S.
    • Phosphorylation of E2F-1 by cyclin A-cdk2 reduces its binding to the E2 promoter.
    • In vivo phosphorylation of E2F-1 was inhibited by butyrolactone I.

    Conclusions:

    • E2F-1 is phosphorylated by cyclin A-cdk2 during the S phase, both in vivo and in vitro.
    • Phosphorylation of E2F-1 by cyclin A-cdk2 modulates its transcriptional activity by reducing promoter binding.
    • This suggests a mechanism for shutting off gene expression at the transcriptional level via E2F-1 modification.