FIGURE 4.

We consider four representative generic model proteins. Cases A, B, and C are disk-like proteins of height h_p = 10 Å and radius R_p = 10 Å. Case D is a sphere of radius R_p = 10 Å. The shaded regions represent charged areas: in A and B only the membrane-facing bottom is charged whereas in C and D it is also the lower half of the protein. The dashed lines coincide with the axis of cylindrical symmetry, the horizontal thick solid lines mark the charged membrane. In all cases, the surface charge density corresponds to an effective composition of φ_p = 0.6 (recall σ_p = φ_pe/a_l), and the minimal membrane-protein distance is set to h = 3 Å.