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Related Experiment Videos

Multiple Ras-dependent phosphorylation pathways regulate Myc protein stability.

R Sears1, F Nuckolls, E Haura

  • 1Department of Genetics, Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710, USA.

Genes & Development
|October 6, 2000
PubMed
Summary
This summary is machine-generated.

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The Ras/Raf/ERK pathway stabilizes Myc protein by phosphorylating Ser 62, while Thr 58 phosphorylation promotes Myc degradation. Both pathways are crucial for cell proliferation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Oncogenesis

Background:

  • The Ras/Raf/ERK pathway influences Myc protein stability and activity.
  • Myc protein accumulation is critical for cell proliferation.
  • Mitogen stimulation regulates Myc phosphorylation at Thr 58 and Ser 62.

Purpose of the Study:

  • To investigate the role of Myc phosphorylation sites Thr 58 and Ser 62 in Myc protein stability.
  • To elucidate the mechanisms by which Ras-mediated pathways control Myc accumulation.

Main Methods:

  • Investigated N-terminal phosphorylation sites in Myc (Thr 58 and Ser 62).
  • Analyzed the impact of Ras/Raf/ERK and PI-3K pathways on Myc stability.
  • Examined the role of ERK and GSK-3 in regulating Myc phosphorylation and degradation.

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Main Results:

  • Phosphorylation of Ser 62 is essential for Ras-induced Myc stabilization, likely via ERK.
  • Phosphorylation of Thr 58, dependent on Ser 62 phosphorylation and mediated by GSK-3, leads to Myc degradation.
  • The Ras-dependent PI-3K pathway controls Myc accumulation by regulating GSK-3 activity.

Conclusions:

  • Multiple Ras-mediated phosphorylation pathways synergistically control Myc protein accumulation.
  • These pathways are critical during the initial stages of cell proliferation.
  • Understanding these mechanisms provides insights into oncogenic signaling pathways.