PI3K enzyme bound to adaptor protein TRIM, uses phosphatidylinositol 4,5-bisphosphate (PIP2) as its substrate and phosphorylates it to generate phosphatidylinositol 3,4,5-trisphosphate (PIP3). This PIP3 acts as a membrane anchor for the downstream proteins like PDK1 and PKB.
Koyasu, S
phosphatidylinositol-4,5-bisphosphate 3-kinase activity of PI3K bound to TRAT [plasma membrane]
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