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Related Experiment Videos

Tumor-specific proteolytic processing of cyclin E generates hyperactive lower-molecular-weight forms.

D C Porter1, N Zhang, C Danes

  • 1Division of Molecular Medicine, Wadsworth Center, Albany, New York 12201-0509, USA.

Molecular and Cellular Biology
|August 18, 2001
PubMed
Summary
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Lower-molecular-weight cyclin E (LMW CE) isoforms are hyperactive and drive cancer cell proliferation. Proteolytic cleavage generates these oncogenic forms, impacting cell cycle progression and patient outcomes in breast cancer.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Biochemistry

Background:

  • Cyclin E is a G(1) cyclin crucial for cell cycle progression into S-phase.
  • Overexpressed and lower-molecular-weight (LMW) cyclin E isoforms are observed in breast cancer, correlating with poor patient outcomes.

Purpose of the Study:

  • To investigate the biochemical activity and biological function of LMW cyclin E isoforms found in breast tumors.
  • To identify the mechanisms responsible for generating LMW cyclin E isoforms.

Main Methods:

  • Biochemical assays and mutational analysis to study cyclin E proteolysis.
  • Transfection of normal cells with LMW cyclin E to assess functional impact.
  • In vitro cleavage assays using elastase class serine proteases.

Related Experiment Videos

Main Results:

  • LMW cyclin E isoforms exhibit higher biochemical activity, phosphorylating substrates like histone H1 and GST-Rb.
  • Overexpression of nuclear-localized LMW cyclin E enhances G(1)-to-S and G(2)/M phase entry in normal cells.
  • Elastase class serine proteases selectively cleave cyclin E in vitro, generating LMW forms similar to those in tumors.

Conclusions:

  • Proteolytic processing of cyclin E generates hyperactive LMW isoforms, contributing to aberrant cell cycle progression in cancer.
  • These modified LMW cyclin E isoforms play a role in the defective S-phase entry and exit observed in tumor cells.