Dipeptide libraries with epoxidic anchor function were produced in order to acquire structural information on the primed side binding pockets of papain-like cysteine proteases. The preferences of cathepsin L, B and X, as well as µ-calpain were investigated and inhibitors with augmented affinity for cathepsin L und B were obtained. In the case of µ-calpain, an approach based on a peptide fragment obtained from the endogenous inhibitor calpastatin was more successful. A 20-mer peptide with submicromolar inhibition capacity was found, while the N- and C-terminal parts’ share of the selective binding was elucidated with truncated fragments and non-peptidically bridged constructs. Finally, the previously postulated existence of a type II β-turn was confirmed with cyclic homodetic peptides. The 20-mer peptide was also fitted with photo labeling groups in order to elucidate the binding mode of this novel inhibitor to µ-calpain.
«
Dipeptide libraries with epoxidic anchor function were produced in order to acquire structural information on the primed side binding pockets of papain-like cysteine proteases. The preferences of cathepsin L, B and X, as well as µ-calpain were investigated and inhibitors with augmented affinity for cathepsin L und B were obtained. In the case of µ-calpain, an approach based on a peptide fragment obtained from the endogenous inhibitor calpastatin was more successful. A 20-mer peptide with submicr...
»