An N-myristoylated cell-permeable PI 3-K p110 beta-derived G beta-gamma-binding peptide (aa514-537 in p110 beta C2-helical linker region) that prevents G beta-gamma-, but not RTK-, mediated p100 beta activation both in cell-free assays (1uM) and in cultures (30uM in p110 beta/p85/Akt/G beta-gamma-transfected HEK 293E cells) without affecting basal p100 beta activity, p110 beta-Rab5 interaction, nor G beta-gamma-dependent activation of adenylyl cyclase or p101-p110-gamma dimer. The ATP-competitive p110 beta inhibitior TGX-221 can be used in conjunction for studying G beta-gamma dependency of p110 beta-mediated cellular functions.
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