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Protein arginine methyltransferase 5 regulates ERK1/2 signal transduction amplitude and cell fate through CRAF

Pedro Andreu-Pérez1, Rosaura Esteve-Puig, Carlos de Torre-Minguela

  • 1Mouse Models and Cancer Laboratory, Anatomy Pathology Department, Vall d'Hebron Research Institute, Barcelona 08035, Spain.

Science Signaling
|September 16, 2011
PubMed

Insights

Protein arginine methylation by PRMT5 limits the RAS-ERK pathway signaling. This methylation enhances RAF protein degradation, impacting cell growth and differentiation, and offering new therapeutic targets.

Area of Science:

  • Cellular signaling
  • Molecular biology
  • Cancer research

Background:

  • The RAS-ERK pathway regulates critical cellular functions like proliferation and differentiation.
  • Different growth factors activate this pathway with varying signal amplitudes and durations, leading to distinct biological outcomes.
  • Epidermal growth factor (EGF) typically promotes proliferation, while nerve growth factor (NGF) promotes differentiation in PC12 cells.

Purpose of the Study:

  • To investigate the role of protein arginine methylation in regulating the RAS-ERK signaling pathway.
  • To identify the specific proteins and enzymes involved in this regulatory mechanism.
  • To explore the impact of this regulation on cellular responses to growth factors.

Main Methods:

  • Investigated the effect of protein arginine methylation on ERK1/2 phosphorylation.
  • Utilized protein arginine methyltransferase 5 (PRMT5) and its role in RAF protein methylation.
  • Examined the degradation of RAF proteins (CRAF and BRAF) upon methylation.
  • Assessed the impact of PRMT5 inhibition and RAF methylation mutants on ERK signaling and PC12 cell responses.

Main Results:

  • Protein arginine methylation by PRMT5 was found to limit ERK1/2 signaling.
  • PRMT5-mediated methylation enhanced the degradation of activated CRAF and BRAF, reducing their activity.
  • Inhibition of PRMT5 or use of non-methylatable RAF mutants altered ERK signal amplitude and duration.
  • PC12 cells treated with EGF exhibited a shift from proliferation to differentiation when PRMT5 was inhibited.

Conclusions:

  • Protein arginine methylation, specifically by PRMT5, acts as a critical regulator of the RAS-ERK pathway.
  • This methylation-dependent degradation of RAF proteins provides a novel mechanism for controlling signal transduction.
  • Targeting PRMT5 or this regulatory axis may offer new therapeutic strategies for diseases involving aberrant cell signaling.

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