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- W2316574060 abstract "The middle tumor antigen (middle-T) of mouse polyomavirus is responsible for the transforming potential of this virus. Middle-T has been shown to interact with a variety of cellular proteins known to mediate mitogenic signaling, like phosphatase-2A, Src family kinases, phosphatidylinositol 3-kinase (PI 3-kinase), the adapter protein SHC, phospholipase Cγ-1 and 14-3-3 family proteins. Association with SHC and PI 3-kinase, respectively, stimulates two independent signaling pathways that are indispensible for viral oncogenicity. SHC activates the Ras/MAPK pathway via Grb2/SOS resulting in changes in early gene expression. The downstream targets of PI 3-kinase are less well studied but seem to impinge on serum response factor (SRF) which is also involved in regulating early gene expression. Recently, the protein kinase B/Akt (PKB/Akt) has been identified as a target of PI 3-kinase in receptor tyrosine kinase signaling. Here we show that PKB/Akt is a target of wild type middle-T, but not of mutants unable to activate PI 3-kinase. These data were confirmed using inhibitors of PI 3-kinase as well as dominant-negative alleles of the catalytic subunit of this lipid kinase. In addition, mutants of PKB/Akt lacking a pleckstrin homology domain and therefore unable to bind to D3 phospatidylinositides were not activated by middle-T. Taken together these data suggest that middle-T activates PKB/Akt in a PI 3-kinase-dependent manner. Furthermore, direct association with D3 phosphatidylinositides seems to be essential for activation of PKB/Akt." @default.
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- W2316574060 date "1998-02-19" @default.
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- W2316574060 title "Protein kinase B/Akt is activated by polyomavirus middle-T antigen via a phosphatidylinositol 3-kinase-dependent mechanism" @default.
- W2316574060 doi "https://doi.org/10.1038/sj.onc.1201605" @default.
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