Figure 5.
Difference contact map, <ΔCl(i,k)>, displaying changes in the probability of contacts forming between amino acids i and lipid groups k. <ΔCl(i,k)> is defined as <ΔCl(i,k)>1 − <ΔCl(i,k)>2, where indices 1 and 2 stand for Aβ+BL+Ca and Aβ+BL, respectively. Color codes for the regions S1–S4 are as in Fig. 1a. The plot implicates calcium ions in promoting stronger binding of polar segments S1 and S3 (particularly charged amino acids Glu11, Glu22, Asp23, and Lys28) to lipid headgroups. To see this figure in color, go online.