(A) Sequence of the SNX5 PX domain fusion protein with the IncE C-terminal peptide. (B) Refined 2fo-fc electron density contoured at 1.5σ for the SNX5-IncE structure in spacegroup P212121. (C) Overlay of each independent SNX5-IncE complex observed in the three crystal forms. (D) Ribbon structures indicating the locations of the linker regions in each crystal form. The C-terminal SNX5 residues and the N-terminal IncE residues are shown by spheres with distances indicated.