PI3K phosphorylates PIP2 to PIP3

Stable Identifier
R-HSA-2316434
Type
Reaction [transition]
Species
Homo sapiens
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A number of different extracellular signals converge on PI3K activation. PI3K can be activated downstream of receptor tyrosine kinases (RTKs) such as FGFR (Ong et al. 2001, Eswarakumar et al. 2005), KIT (Chian et al. 2001, Ronnstrand 2004, Reber et al. 2006), PDGF (Coughlin et al. 1989, Fantl et al. 1992, Heldin et al. 1998), insulin receptor IGF1R (Hadari et al. 1992, Kooijman et al. 1995), and EGFR and its family members (Rodrigues et al. 2000, Jackson et al. 2004, Kainulainen et al. 2000, Junttila et al. 2009). Other proteins, such as CD28 (Pages et al. 1996, Koyasu 2003, Kane and Weiss, 2003) and TRAT1 (Bruyns et al. 1998, Koyasu 2003, Kolsch et al. 2006), can also trigger PI3K activity.

In unstimulated cells, PI3K class IA exists as an inactive heterodimer of a p85 regulatory subunit (encoded by PIK3R1, PIK3R2 or PIK3R3) and a p110 catalytic subunit (encoded by PIK3CA, PIK3CB or PIK3CD). Binding of the iSH2 domain of the p85 regulatory subunit to the ABD and C2 domains of the p110 catalytic subunit both stabilizes p110 and inhibits its catalytic activity. This inhibition is relieved when the SH2 domains of p85 bind phosphorylated tyrosines on activated RTKs or their adaptor proteins. Binding to membrane-associated receptors brings activated PI3K in proximity to its membrane-localized substrate, PIP2 (Mandelker et al. 2009, Burke et al. 2011).

Literature References
PubMed ID Title Journal Year
21827948 Dynamics of the phosphoinositide 3-kinase p110? interaction with p85? and membranes reveals aspects of regulation distinct from p110?

Burke, JE, Vadas, O, Berndt, A, Finegan, T, Perisic, O, Williams, RL

Structure 2011
19805105 A frequent kinase domain mutation that changes the interaction between PI3Kalpha and the membrane

Mandelker, D, Gabelli, SB, Schmidt-Kittler, O, Zhu, J, Cheong, I, Huang, CH, Kinzler, KW, Vogelstein, B, Amzel, LM

Proc. Natl. Acad. Sci. U.S.A. 2009
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Catalyst Activity
Title
phosphatidylinositol-4,5-bisphosphate 3-kinase activity of Activator:PI3K [plasma membrane]
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