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Cdc25B activity is regulated by 14-3-3.

A Forrest1, B Gabrielli

  • 1Joint Oncology Program, Department of Pathology, University of Queensland School of Medicine, Herston Road, Brisbane, Queensland 4006, Australia.

Oncogene
|July 24, 2001
PubMed
Summary

14-3-3 proteins inhibit cell cycle progression by binding to cdc25B, a key regulator of mitosis. Disrupting this interaction overcomes G2 arrest, revealing a direct mechanism for controlling entry into mitosis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The G2 cell cycle checkpoint prevents entry into mitosis until DNA is repaired.
  • cdc25 phosphatases (cdc25B and cdc25C in humans) are crucial for activating cyclin B/cdc2 kinase, which drives mitotic entry.
  • 14-3-3 proteins bind to cdc25C, inhibiting its function and contributing to the G2 arrest.

Purpose of the Study:

  • To investigate the role of 14-3-3 binding in regulating the function of the cdc25B phosphatase.
  • To determine if cdc25B activity can overcome G2 checkpoint arrest.
  • To elucidate the mechanism by which 14-3-3 binding affects cdc25B activity.

Main Methods:

  • Over-expression of wild-type and mutant cdc25B in G2-arrested human cells.
  • Site-directed mutagenesis of the major 14-3-3 binding site (S323) on cdc25B.
  • Analysis of cyclin B/cdc2 activation and mitotic entry.
  • Biochemical assays to assess cdc25B catalytic activity and substrate access.

Main Results:

  • High-level expression of cdc25B in G2-arrested cells activated cyclin B/cdc2 and overcame the G2 arrest.
  • Mutations at the S323 14-3-3 binding site or deletion of the N-terminal regulatory domain strongly activated cdc25B, promoting aberrant mitosis.
  • 14-3-3 binding to S323 directly inhibited cdc25B activity by blocking substrate access to the catalytic site.

Conclusions:

  • 14-3-3 binding to cdc25B is a key regulatory mechanism that inhibits its phosphatase activity.
  • Disruption of 14-3-3 binding to cdc25B can release the G2 checkpoint and promote mitotic entry.
  • This study provides direct mechanistic insight into how cdc25B activity is controlled to regulate cell cycle progression into mitosis.

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