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SH3P2 in complex with Cbl and Src.

Iwona Szymkiewicz1, Olivier Destaing, Pierre Jurdic

  • 1Institute of Biochemistry II, Goethe University Medical School, Frankfurt, Germany.

FEBS Letters
|May 12, 2004
PubMed
Summary
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SH3P2 is a novel protein interacting with Cbl and tyrosine kinase Src. It localizes to cell adhesion sites, suggesting a role in Cbl and Src signaling pathways.

Area of Science:

  • Molecular and Cell Biology
  • Protein-protein interactions
  • Cell adhesion

Background:

  • Cbl proteins are key regulators of receptor tyrosine kinases.
  • Src is a non-receptor tyrosine kinase involved in various cellular processes.
  • Understanding novel interacting partners of Cbl and Src is crucial for elucidating signaling pathways.

Purpose of the Study:

  • To identify and characterize SH3P2 as a novel Cbl-interacting protein.
  • To investigate the role of SH3P2 in cellular adhesion sites.
  • To elucidate the functional relationship between SH3P2, Cbl, and Src.

Main Methods:

  • Co-immunoprecipitation assays to study protein-protein interactions.
  • Site-directed mutagenesis to identify binding motifs.

Related Experiment Videos

  • Immunofluorescence microscopy to determine subcellular localization.
  • Cell adhesion assays.

    • Main Results:

    • SH3P2 was identified as a novel binding partner of Cbl.
    • A specific polyproline motif in Cbl was found to mediate binding of SH3P2 and Src.
    • SH3P2 and Src were observed to mutually sequester from monomeric Cbl.
    • SH3P2 localized to focal contacts in fibroblasts and podosome rings in osteoclasts, associating with Cbl and actin.

    Conclusions:

    • SH3P2 is a novel component of cell adhesion sites.
    • SH3P2 is involved in Cbl and Src-mediated signaling pathways.
    • SH3P2 plays a role in regulating Cbl and Src interactions at adhesion sites.