A multifunctional docking site mediates signaling and transformation by the hepatocyte growth factor/scatter factor

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C Ponzetto1, A Bardelli, Z Zhen

  • 1Department of Biomedical Sciences and Oncology, University of Torino Medical School, Italy.

Cell
|April 22, 1994
PubMed

Insights

The hepatocyte growth factor/scatter factor (HGF/SF) receptor has a unique docking site that binds multiple signaling proteins. This site is crucial for receptor function and is conserved in related receptors.

Area of Science:

  • Cellular signaling
  • Molecular biology
  • Receptor tyrosine kinases

Background:

  • Tyrosine kinase receptor signaling relies on interactions between SH2 domains and phosphotyrosine residues.
  • The hepatocyte growth factor/scatter factor (HGF/SF) receptor's signaling mechanisms require detailed investigation.

Purpose of the Study:

  • To identify and characterize the multifunctional docking site on the HGF/SF receptor.
  • To elucidate the role of this docking site in mediating signal transduction.
  • To investigate the conservation and functional significance of this motif in related receptors.

Main Methods:

  • Site-directed mutagenesis to alter specific tyrosine residues.
  • Biochemical assays to assess protein-ligand interactions.
  • Analysis of biological function, including transforming activity.

Main Results:

  • Identified a multifunctional docking site (YVH/NV) on the HGF/SF receptor.
  • Demonstrated that this site binds multiple SH2-containing signal transducers (PI3K, PLCγ, Src, GRB-2/Sos).
  • Showed that mutating the tyrosines abrogates receptor function and transforming activity.

Conclusions:

  • The HGF/SF receptor utilizes a single multifunctional docking site for signal transduction.
  • This bidentate motif is conserved in related receptors (Sea, Ron), indicating a common signaling mechanism.
  • The findings reveal a conserved strategy for signal channeling in the HGF/SF receptor family.

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