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The Ras-Byr2RBD complex: structural basis for Ras effector recognition in yeast.

K Scheffzek1, P Grünewald, S Wohlgemuth

  • 1Max-Planck-Institut für molekulare Physiologie, Abt. Strukturelle Biologie, Otto-Hahn-Str. 11, 44227, Dortmund, Germany.

Structure (London, England : 1993)
|November 16, 2001
PubMed
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Researchers elucidated the Ras-Byr2 complex structure, revealing conserved Ras-effector interactions in yeast. An additional helical segment in Byr2 may play a role in kinase activation, offering insights into cancer-related signaling pathways.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Ras GTPase is crucial for cell growth and differentiation, with mutations driving cancer by maintaining constitutive activity.
  • Ras proteins activate downstream signaling cascades, often involving kinase pathways, but the precise activation mechanism remains unclear.
  • Understanding Ras-effector interactions is vital, yet structural data for non-mammalian systems are limited.

Purpose of the Study:

  • To determine the structural basis of Ras-effector interactions using the Schizosaccharomyces pombe Byr2 kinase as a model.
  • To investigate the conserved mechanisms of Ras signaling in a lower eukaryotic system.
  • To identify novel structural features that may contribute to kinase activation.

Main Methods:

Related Experiment Videos

  • X-ray crystallography was employed to determine the structure of the Ras-Byr2 Ras binding domain (RBD) complex.
  • The complex was analyzed at 3 Å resolution to elucidate interprotein interactions and structural architecture.
  • Bioinformatic and structural comparisons were made with known mammalian Ras-effector complexes.

    • Main Results:

    • The crystal structure revealed a conserved complex architecture between Ras and Byr2RBD, featuring an interprotein beta sheet stabilized by polar interactions.
    • Key contact points were identified within the Ras switch I region and across topologically distinct regions of Byr2.
    • A novel C-terminal helical segment in Byr2, absent in mammalian homologs, was found to possess an additional binding site outside the switch I region.

    Conclusions:

    • The Ras-Byr2 complex structure validates the Ras binding module as a conserved communication element mediating Ras-effector interactions.
    • The conservation of Ras-effector complex architecture in yeast highlights a fundamental signaling mechanism across eukaryotes.
    • The identified C-terminal helical segment in Byr2 is proposed to play a role in kinase activation, potentially representing a novel regulatory mechanism.