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PI3 kinases catalyze the production of phosphatidylinositol-3, 4, 5-triphosphate (PIP3) by phosphorylating phosphatidylinositol-4, 5-bisphosphate (PIP2). PIP3 bound to the inner lipid bilayer of the plasma membrane promotes the recruitment and activation of AKT. Active AKT subsequently phosphorylates the pro-apoptotic factor Bad at Ser136 which leads to it binding 14-3-3 protein and sequestering from the anti-apoptotic molecules Bcl-XL therby reducing antiapoptotic events and promoting cell survival. The alternative route for c-Kit mediated survival is through AKT-mediated phosphorylation and incativation of the forkhead transcription factor (FoxO3a) (Engstrom et al, 2003; Lennartson et al , 2005).
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