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Ras target proteins in eukaryotic cells

M S Marshall1

  • 1Department of Medicine, Indiana University School of Medicine, Indianapolis 46202, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|October 1, 1995
PubMed
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Ras proteins regulate key cell pathways. While Raf is a major mediator, new research reveals other Ras-interacting proteins, expanding our understanding of Ras signaling networks.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ras proteins (21 kDa) are crucial regulators of oncogenic, mitogenic, and developmental signaling.
  • Downstream signal transduction cascades initiated by Ras are not fully understood.
  • Recent studies indicate Ras directly regulates multiple signaling pathways across eukaryotes.

Purpose of the Study:

  • To review accepted and potential Ras-dependent signaling proteins.
  • To explore Ras interactions beyond the canonical Raf pathway.
  • To synthesize findings from lower eukaryotes and vertebrates.

Main Methods:

  • Literature review of diverse studies.
  • Yeast two-hybrid assays.
  • GST-fusion protein binding studies.

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Main Results:

  • Ras primarily activates ERK/MAPK cascades via MEKK, with Raf being the main mammalian MEKK.
  • Raf does not account for all Ras-mediated biochemical responses.
  • Identified potential Ras targets include MEKK1, PI(3)K, p120GAP, ralGDS, and PKC zeta.

Conclusions:

  • Ras signaling is more complex than previously thought, involving multiple effectors.
  • Understanding these diverse Ras-interacting proteins is key to deciphering its full biological role.
  • This review consolidates current knowledge on Ras-dependent pathways.