PI3-kinase phosphorylates several phosphatidyl-inositides (phospholipids) at the plasma membrane: the most relevant is PtdIns(3,4,5)P3, also named PIP3.
Woodgett, JR, Scheid, MP, Marignani, PA
phosphatidylinositol-4,5-bisphosphate 3-kinase activity of Phospho-IRS1/2:PI3K(p85:p110) [plasma membrane]
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