Fig. 6. Ternary anion–π interactions in protein–protein complexes. (a) Human PRMT5 (orange surface) interacting with MET50 (turquoise ribbon) (PDB code 4GQB), where a Glu–π–Arg contact at the protein–protein interface is shown. (b) Human IL-1β (green surface) interacting with the antibody canakinumab (blue ribbon) (PDB code ; 4G6J), where a Glu–π–π contact at the protein–protein interface is shown.
