r-18

Antagonist of 14.3.3 proteins (KD ≈80 nM). Competitively inhibits 14.3.3-ligand interactions without requiring phosphorylation. Blocks the ability of 14.3.3 to bind to target proteins such as Raf-1, Bad, ASK1 and exoenzyme S.

R18 TFA, a peptide antagonist of 14-3-3, exhibits a dissociation constant (K_D) of 70-90 nM. It efficiently inhibits the interaction between 14-3-3 and its physiological ligand, the kinase Raf-1, thereby significantly impeding the protective effect of 14-3-3 on Raf-1 against phosphatase-induced deactivation [1].