Figure 4 - full size

Figure 4.
Figure 4 Model of phospholipid headgroup interactions with PI3K . a, Orthogonal views of the solvent-accessible surface. The activation loop is black. An inositol 1,4,5-trisphosphate (InsP[3]) molecule (white ball-and-stick) is modelled in the active site with the 3-OH near the -phosphate of the bound ATP. b, The same views in ribbon representation showing the activation loop (magenta) and InsP[3] (blue). The right panel is expanded to show features of the putative headgroup interaction.