Cathepsin X/Z/P Proteins and Enzymes

Cathepsin X, also known as Cathepsin Z and Cathepsin P, is a relatively new cysteine protease of the papain family. Compared to other members of the papain family, Cathepsin X has a short proregion and unique insertions. The cysteine residue in the proregion forms a covalent and reversible bond with the active site cysteine residue.