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Proteins encoded by the c-myc oncogene: analysis of c-myc protein degradation

B Lüscher1, R N Eisenman

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104.

Princess Takamatsu Symposia
|January 1, 1986
PubMed

Insights

The c-myc oncogene protein is rapidly degraded across diverse species and cell types. This degradation is ATP and metal ion-dependent, with the nucleus playing a key role.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • The c-myc oncogene protein is known for its rapid degradation.
  • Understanding c-myc protein turnover is crucial for comprehending its role in normal and transformed cells.

Purpose of the Study:

  • To investigate the characteristics and regulation of c-myc protein degradation.
  • To determine the species and cell-type specificity of c-myc protein stability.
  • To identify factors involved in the degradation process.

Main Methods:

  • Pulse-chase analysis of cell cycle subpopulations separated by centrifugal elutriation.
  • Immunoprecipitation and immunoblotting for kinetic analysis of protein turnover.
  • Experiments with enucleated cells and chemical agents.

Main Results:

  • Rapid degradation of c-myc proteins is conserved across diverse species (human, avian, murine, amphibian) and cell types (normal and transformed).
  • Degradation rate is consistent throughout G1, S, and G2 cell cycle phases.
  • The nucleus is implicated in degradation; c-myc proteins are stable in enucleated cells and potentially during mitosis.
  • ATP and metal ions are involved in c-myc protein degradation, which appears to occur without a large protected pool or major detectable products.

Conclusions:

  • c-myc protein's rapid turnover is a fundamental characteristic conserved across species.
  • Nuclear localization and ATP/metal ion-dependent processes are critical for c-myc protein degradation.
  • These findings provide insights into the regulation of c-myc protein stability and its implications in cancer biology.

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