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Structural basis for Gas6-Axl signalling.

Takako Sasaki1, Pjotr G Knyazev, Naomi J Clout

  • 1Max-Planck-Institut für Biochemie, Martinsried, Germany.

The EMBO Journal
|December 20, 2005
PubMed
Summary
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The Gas6 protein binds to the Axl receptor, forming a 2:2 complex essential for cell signaling. Both major and minor binding sites on Gas6 are crucial for activating Axl receptor tyrosine kinases.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Receptor tyrosine kinases (RTKs) of the Axl family are critical regulators of cellular processes.
  • Gas6, a vitamin K-dependent protein, is the primary ligand that activates Axl family receptors.
  • Dysregulated Axl signaling is implicated in various diseases, including cancer and immune disorders.

Purpose of the Study:

  • To elucidate the structural basis of the Gas6/Axl complex formation.
  • To understand the molecular mechanisms underlying Gas6-mediated Axl receptor activation.
  • To identify key interaction sites critical for Axl signaling.

Main Methods:

  • X-ray crystallography to determine the 3.3 Å resolution structure of the minimal human Gas6/Axl complex.

Related Experiment Videos

  • Structure-based mutagenesis to probe the functional significance of interaction interfaces.
  • Protein binding assays and receptor activation experiments to validate structural findings.

    • Main Results:

    • The Gas6/Axl complex adopts a 2:2 stoichiometry, with Gas6 crosslinking the immunoglobulin-like domains of Axl.
    • Two distinct Gas6 binding sites, a major and a minor one, were identified, both involving edge beta-strand interactions.
    • Both binding sites are indispensable for Gas6-mediated Axl transmembrane signaling, suggesting a two-step dimerization process.
    • The minor binding site shows high conservation across Axl family receptors (Sky/Tyro3, Mer), while the major site contributes to specificity.

    Conclusions:

    • The study reveals the detailed structure of the Gas6/Axl complex, highlighting the critical role of dual binding interactions for receptor activation.
    • Understanding these interactions provides insights into Axl signaling pathways and potential therapeutic targets.
    • The findings contribute to the comprehension of RTK activation mechanisms and their roles in physiological and pathological processes.