Vav binds to several SH2/SH3 containing proteins in activated lymphocytes

Francisco Ramos-Morales, Brian J. Druker, Siegmund Fischer

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


In T lymphocytes, several proteins are rapidly phosphorylated on tyrosine after stimulation. In this study we examine the ability of tyrosine phosphorylated proteins from Jurkat T cells stimulated by CD2 or T cell receptor-CD3 to interact with the src homology 2 or src homology 3 domains from eight different proteins involved in signal transduction in lymphocytes: Vav, Shc, Nck, phosphatidylinositol-3-kinase, phospholipase C-γ 1, Ras-GTPase activating protein, c-Crk and Grb2. Our data show that different SH2 domains have distinct patterns of binding to phosphotyrosine containing proteins. We show that Vav, a protein expressed only in hematopoietic cells that may have guanine nucleotide releasing factor activity, is able to interact with certain SH2-containing proteins depending on its tyrosine phosphorylation and with Grb2 in a manner independent of phosphorylation on tyrosine. Coimmunoprecipitation experiments support the idea of a trimolecular complex Shc-Grb2-Vav in vivo. These data suggest a central role played by Vav and provide insight in the complexity and specificity of protein-protein interactions in the signaling events in lymphocytes.

Original languageEnglish (US)
Pages (from-to)1917-1923
Number of pages7
Issue number7
StatePublished - Jul 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research


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