Abstract
The Src-related tyrosine kinase p59fyn(T) plays an important role in the generation of intracellular signals from the T-cell antigen receptor TCR zeta/CD3 complex. A key question concerns the nature and the binding sites of downstream components that interact with this Src-related kinase. p59fyn(T) contains Src-homology 2 and 3 domains (SH2 and SH3) with a capacity to bind to intracellular proteins. One potential downstream target is phosphatidylinositol 3-kinase (PI 3-kinase). In this study, we demonstrate that anti-CD3 and anti-Fyn immunoprecipitates possess PI 3-kinase activity as assessed by TLC and HPLC. Both free and receptor-bound p59fyn(T) were found to bind to the lipid kinase. Further, our results indicate that Src-related kinases have developed a novel mechanism to interact with PI 3-kinase. Precipitation using GST fusion proteins containing Fyn SH2, SH3, and SH2/SH3 domains revealed that PI 3-kinase bound principally to the SH3 domain of Fyn. Fyn SH3 bound directly to the p85 subunit of PI 3-kinase as expressed in a baculoviral system. Anti-CD3 crosslinking induced an increase in the detection of Fyn SH3-associated PI 3-kinase activity. Thus PI 3-kinase is a target of SH3 domains and is likely to play a major role in the signals derived from the TCR zeta/CD3-p59fyn complex.
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