PTEN equilibration on a PC/PS (2:1) membrane. (A) Vertical distances, Δz, between the average lipid phosphate position and the centers of mass of the full-length protein and various protein domains. (B) The two relevant Euler angles θ and φ of PTEN on the membrane surface. θ is the angle between the polar axes of the protein and the bilayer. φ of is the rotation angle of the protein about its polar axis. Both angles are zero in that protein orientation where PTEN’s putative membrane binding interface, proposed from the crystal structure (Lee et al., 1999), is oriented parallel to the membrane surface.