Reaction: PI3K phosphorylates PIP2 to PIP3
- in pathway: DAP12 signaling
Activated PI3K phosphorylates phosphatidylinositol (PI) 4-phosphate and PI 4,5-bisphosphate (PIP2) to generate PI 3,4-bisphosphate and PI 3,4,5-triphosphate (PIP3) and these second messengers recruit other signaling proteins containing plecstrin homology (PH) domain. Products of PI3K are involved in the regulation of PLC-gamma 1 and VAV activation. The PH domain of PLC-gamma 1 binds to PIP3 and is targeted to the membrane. PIP3 binds to the PH domain of VAV2/VAV3 and increases it activity and PI3K may also strongly stimulate VAV activity by converting an inhibitory regulator VAV to an activator (Toker & Cantley 1997, Fischer et al. 1998, Falasca et al. 1998).
Reaction - small molecule participants:
PI(3,4,5)P3 [plasma membrane]
ADP [cytosol]
ATP [cytosol]
PI(4,5)P2 [plasma membrane]
Reactome.org reaction link: R-HSA-2424480
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Reaction input - small molecules:
ATP(4-)
1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate(5-)
Reaction output - small molecules:
1-phosphatidyl-1D-myo-inositol 3,4,5-trisphosphate(7-)
ADP(3-)
Reactome.org link: R-HSA-2424480