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Updated: Jul 14, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

DA-Raf1, a competent intrinsic dominant-negative antagonist of the Ras-ERK pathway, is required for myogenic

Takashi Yokoyama1, Kazunori Takano, Akira Yoshida

  • 1Department of Biology, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.

The Journal of Cell Biology
|May 31, 2007
PubMed

Insights

Researchers discovered DA-Raf1, a novel protein that acts as a dominant-negative antagonist of the Ras-extracellular-regulated kinase (ERK) pathway. This finding offers new insights into regulating cellular processes like myogenic differentiation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The Ras-Raf-ERK pathway regulates crucial cellular functions.
  • Understanding regulators of Ras-Raf interaction is vital for various physiological and pathological responses.

Purpose of the Study:

  • To identify and characterize novel regulators of the Ras-Raf interaction.
  • To investigate the role of DA-Raf1 in cellular signaling and differentiation.

Main Methods:

  • Identification of DA-Raf1 as a splicing isoform of A-Raf.
  • Analysis of DA-Raf1's structure and binding properties to Ras and M-Ras.
  • Assessment of DA-Raf1's impact on the ERK pathway and myogenic differentiation.

Main Results:

  • DA-Raf1 binds to activated Ras and M-Ras, inhibiting the ERK pathway.
  • DA-Raf1 lacks kinase activity but possesses a Ras-binding domain.
  • DA-Raf1 promotes myogenic differentiation by inducing cell cycle arrest and muscle-specific protein expression.

Conclusions:

  • DA-Raf1 is a novel, intrinsic, dominant-negative antagonist of the Ras-ERK pathway.
  • DA-Raf1 plays a positive regulatory role in myogenic differentiation.
  • DA-Raf1 represents a new target for therapeutic interventions related to Ras-ERK pathway dysregulation.

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