Fig. 7.

PI(4,5)P₂ coordination in major binding sites. (A–C) The probability of C6-PI(4,5)P₂ headgroup coordination by the key basic residues in sites 1, 2, and 4 is shown as black bars. Residues that coordinate C6-PI(4,5)P₂ for >10% of the total binding time in each site are shown [other residues that affect PI(4,5)P₂ binding experimentally are also shown in the Inset]. The color of the star on each bar represents the experimental results in Fig. 3B, where the mutation of the residues affects PI(4,5)P₂ binding to different degrees. The coordination probability for each functional group on the inositol ring (1′-phosphate, 4′-phosphate, 5′-phosphate, 2′-hydroxyl, 3′-hydroxyl, and 6′-hydroxyl) is shown individually. (D–F) Coordination of C6-PI(4,5)P₂ in sites 1, 2, and 4. Amino acids that interact with each binding site are shown as stick representation in green. PI(4,5)P₂ is shown in stick representation in tan.