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Activation of Raf-1 by 14-3-3 proteins

W J Fantl1, A J Muslin, A Kikuchi

  • 1Daiichi Research Center, Cardiovascular Research Institute, Department of Medicine, University of California, San Francisco 94143.

Nature
|October 13, 1994
PubMed

Insights

Researchers discovered that 14-3-3 proteins bind to Raf-1, enhancing its kinase activity. This interaction is crucial for cell growth and differentiation processes, offering new insights into Raf-1 regulation.

Area of Science:

  • Molecular Biology
  • Cell Signaling

Background:

  • Raf-1 is a key protein mediating cell growth and differentiation.
  • The regulation of Raf-1's serine/threonine kinase activity is not fully understood.
  • Raf-1 associates with p21ras.

Purpose of the Study:

  • To identify proteins that interact with Raf-1.
  • To understand the regulation of Raf-1 kinase activity.

Main Methods:

  • Yeast two-hybrid system to identify interacting proteins.
  • Expression in Xenopus oocytes to study protein function.

Main Results:

  • Identified 14-3-3 zeta and 14-3-3 beta as Raf-1 interacting proteins.
  • 14-3-3 proteins enhance Raf-1 activity in Xenopus oocytes.
  • 14-3-3 proteins promote Raf-1-dependent oocyte maturation.

Conclusions:

  • 14-3-3 proteins are novel regulators of Raf-1 kinase activity.
  • The interaction between 14-3-3 proteins and Raf-1 is important for cell signaling pathways.
  • This finding provides a new mechanism for controlling Raf-1 function.

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