Abstract
The membrane lipid phosphatidylinositol (PtdIns) possesses a head group with five free hydroxyl groups (Fig. 1A). Reversible phosphorylation of the hydroxyl moieties generates a family of Ptdlns derivatives known as phosphoinositides. The PI3K family of enzymes phosphorylates the 3’ hydroxyl group of PtdIns, PtdIns 4-phosphate (PtdIns4-P) and PtdIns 4,5-bisphosphate (PtdIns-4,5-P2), resulting in the formation of PtdIns 3-phosphate (PtdIns-3-P), PtdIns 3,4-bisphosphate (PtdIns-3,4-P2), and PtdIns 3,4,5trisphosphate (PtdIns-3,4,5-P3), respectively. Three PI3K classes have been defined on the basis of substrate preference and sequence homology (1) Class I PI3Ks appear to be selective for PtdIns-4,5-P2 in vivo, but can also use PtdIns-4-P and PtdIns in vitro. Class II PI3Ks preferentially phosphorylate PtdIns and PtdIns-4-P, whereas Class III enzymes use only PtdIns. PtdIns-3-P can also be phosphorylated further by another group of enzymes, the PtdInsP kinases, to produce PtdIns-3,4-P2 and PtdIns-3,5-P2 (2,3). Thus, PI3Ks are either directly or indirectly involved in the production of four phosphoinositides: PtdIns-3-P, PtdIns-3,4-P2, PtdIns-3,5-P2, and PtdIns-3,4,5-P3. Yeast contain only the class III enzyme (vps34), whereas higher eukaryotes express all three classes of PI3K.
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© 2000 Humana Press Inc., Totowa, NJ
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Fruman, D.A., Cantley, L.C. (2000). PI3-Kinases. In: Gutkind, J.S. (eds) Signaling Networks and Cell Cycle Control. Cancer Drug Discovery and Development. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-218-0_14
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DOI: https://doi.org/10.1007/978-1-59259-218-0_14
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