Identification and Structure of Small‐Molecule Stabilizers of 14–3–3 Protein–Protein Interactions

Two structurally unrelated small molecules that stabilize the interaction of a 14–3–3 protein with the proton pump PMA2 have been identified. The compounds are selective among different 14–3–3 protein–protein interactions and are active in vivo. Crystal structures of ternary complexes revealed that the molecules bind to different sites in the interface of the 14–3–3 protein and PMA2 (see picture), thus explaining the different binding kinetics.