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Related Experiment Videos

Yeast RAS2 mutations modulating the ras-guanine exchange factor interaction

S Hermann-Le Denmat1, M Jacquet

  • 1Ecole Normale Supérieure, URA C.N.R.S. 1302, Paris, France.

FEBS Letters
|February 10, 1997
PubMed
Summary
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Researchers investigated Saccharomyces cerevisiae Ras2p interactions with human guanine nucleotide exchange factor HGRF55. Key mutations affecting Ras2p

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Yeast Genetics

Background:

  • Ras proteins are key regulators of cellular signaling pathways.
  • Guanine nucleotide exchange factors (GEFs) modulate Ras activity by promoting GTP binding.
  • Previous studies identified an interaction between Saccharomyces cerevisiae Ras2p and human HGRF55.

Purpose of the Study:

  • To elucidate the specific molecular interactions between Ras2p and HGRF55.
  • To identify key residues in Ras2p involved in GEF recognition and binding.
  • To understand the role of specific Ras2p mutations in modulating GEF interaction.

Main Methods:

  • Utilized a yeast two-hybrid system to screen for Ras2p-HGRF55 interactions.
  • Introduced specific point mutations into Saccharomyces cerevisiae Ras2p.

Related Experiment Videos

  • Assessed the impact of these mutations on Ras2p-HGRF55 binding affinity.

    • Main Results:

    • The N123I substitution, weakening guanine nucleotide binding, enhanced Ras2p-GEF interaction.
    • The R80D substitution abolished Ras2p-GEF interaction, while substitutions at positions 81, 82, and 73 had minor effects.
    • Residue 73, implicated in Ras2p response to GEF, likely mediates conformational changes rather than direct binding.

    Conclusions:

    • Specific residues within the alpha2 helix of Ras2p's switch II region are critical for GEF recognition.
    • The R80D mutation significantly disrupts the interaction interface between Ras2p and HGRF55.
    • These findings provide insights into the structural basis of Ras-GEF complex formation and regulation.