:This article discusses primarily the structure and properties of proteolytic enzymes. For medical, surgical and related applications of several proteases, see article: Proteases (medical and related uses) A protease's any enzyme that conducts proteolysis, that's, begins protein catabolism by hydrolysis of the peptide bonds that link amino acids together in the polypeptide chain, which form a molecule of protein. Classification Standard Proteases are classified into six groups: Serine proteases… (More on Protease)