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Aza-peptide epoxides are a new class of irreversible cysteine protease inhibitors. Derivatives containing a P1 aza-asparagine residue are specific for Schistosoma mansoni and pig kidney legumains, which are clan CD cysteine proteases. The inhibitors have secondorder rate constants of up to 104 M-1s -1 with pig kidney legumain and IC50 values as low as 45 nM with S. mansoni legumain. The most potent epoxides contain an ester moiety with S,S stereochemistry attached to the epoxide. Interestingly, amide and amino acid derivatives of the epoxysuccinate moiety were not inhibitors of legumain, while disubstituted amide derivatives are quite potent. The inhibitors have little or no inhibitory activity with other proteases such as caspases, chymotrypsin, papain, cathepsin B, granzyme B, and various aspartyl proteases.

Aza-Peptide Epoxides: Potent and Selective Inhibitors of Schistosoma mansoni and Pig Kidney Legumains (Asparaginyl Endopeptidases)