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Polyoma virus middle T antigen-pp60c-src complex associates with purified phosphatidylinositol 3-kinase in vitro.

Open AccessPublished:March 15, 1992DOI:https://doi.org/10.1016/S0021-9258(18)42781-0
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      Reconstitution of the polyoma virus middle T antigen (mT)-pp60-src complex and phosphatidylinositol 3-kinase (PtdIns 3-kinase) has been accomplished in vitro with immunopurified baculovirus-expressed mT-pp60c-src and PtdIns 3-kinase purified from rat liver. Both the 110- and 85-kDa subunits of the PtdIns 3-kinase associated with the mT-pp60c-src complex. The association of PtdIns 3-kinase with the mT-pp60c-src complex was dependent on the protein-tyrosine kinase activity of pp60c-src as a kinase-inactive mutant (pp60(295c-src)) still complexed with mT, but the mT-pp60(295c-src)) complex was unable to bind PtdIns 3-kinase. The mT-pp60c-src complex phosphorylated both subunits of PtdIns 3-kinase on tyrosine residues. The immunopurified mT-pp60c-src complex also associated with PtdIns 3-kinase activity from whole cell lysates, and this association was dependent upon the protein-tyrosine kinase activity of pp60c-src. Comparison of 35S-labeled proteins from whole cell lysates which associated with immunopurified mT-pp60c-src and mT-pp60(295c-src) revealed proteins of 110 and 85 kDa as the major peptides dependent on protein-tyrosine kinase activity for association with the complex. In addition, a synthetic phosphopeptide (13-mer) containing sequences conserved between the major tyrosine phosphorylation site of murine polyoma virus mT, hamster polyoma virus mT, and the insulin receptor substrate (IRS-1) specifically blocked the association of the 85- and 110-kDa polypeptides with the mT-pp60c-src complex. The ability to block the association was dependent on the tyrosine phosphorylation of the peptide. Association of PtdIns 3-kinase activity was blocked concurrently. This is the first demonstration that the 110-kDa subunit of PtdIns 3-kinase can associate with mT-pp60c-src. This association in vitro is a step toward understanding protein-protein interactions important in the signal transduction pathway of oncogenic proteins.

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