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RAS function and protein kinase cascades

S Marcus1, M Wigler, H P Xu

  • 1Cold Spring Harbor Laboratory, NY 11724.

Ciba Foundation Symposium
|January 1, 1993
PubMed
Summary
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RAS proteins regulate key cellular functions across species. While RAS stimulates adenylate cyclase in budding yeast, its role in fission yeast and Xenopus oocytes involves conserved protein kinase cascades, offering new research avenues.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Comparative Genomics

Background:

  • RAS proteins are critical regulators of cellular processes.
  • Understanding RAS function is essential for deciphering fundamental cell biology.
  • Comparative studies across different model organisms provide evolutionary insights.

Purpose of the Study:

  • To review recent advancements in RAS protein function research.
  • To compare RAS function in Saccharomyces cerevisiae, Schizosaccharomyces pombe, and Xenopus laevis oocytes.
  • To highlight the utility of the Xenopus laevis oocyte system for studying RAS.

Main Methods:

  • Literature review of recent research on RAS protein function.
  • Comparative analysis of RAS roles in budding yeast, fission yeast, and Xenopus oocytes.

Related Experiment Videos

  • Utilizing cell-free extracts from Xenopus oocytes for functional studies.

    • Main Results:

    • In S. cerevisiae, RAS stimulates adenylate cyclase, activating cAMP-dependent protein kinases, a function likely not conserved.
    • In S. pombe, RAS function is less understood but may activate a conserved protein kinase cascade.
    • Evidence suggests a conserved linkage between RAS and protein kinase cascades, demonstrable in Xenopus oocytes.

    Conclusions:

    • RAS plays diverse roles, with some functions (e.g., cAMP pathway) being species-specific.
    • Protein kinase cascades downstream of RAS appear to be evolutionarily conserved.
    • The Xenopus laevis oocyte system is a valuable tool for dissecting RAS signaling pathways and identifying its targets.