Alpha 1 proteinase inhibitor (Antitrypsin) has a characteristic secondary structure of beta sheets and alpha helices. That is a serum glycoprotein synthesized in the liver. It acts as an elastase inhibitor, primarily inhibiting neutrophil elastase, chymotrypsin, collagenase, leucocytic proteases, plasmin, and thrombin, which may be released during inflammatory reactions in the lung. Also an increase in Antitrypsin occurs as an acute phase response to tissue necrosis and inflammation. Serum level of Antitrypsin is elevated in rheumatoid arthritis, bacterial infections, vasculitis, and carcinomatosis. Recombinant Antitrypsin protein was expressed in E. coli and purified by using conventional chromatography techniques. Alternative Names: Serpin A1 protein, Clade A member 1 protein, Alpha-1 antiproteinase protein, serum trypsin inhibitor, Alpha 1 protease inhibitor protein, Protease inhibitor 1 protein, A1AT protein, Alpha-1 Antitrypsin protein, A1A protein, Alpha 1 antitrypsin protein, Serpin peptidase inhibitor clade A member 1 protein, MGC9222 protein, PRO2275 protein, MGC23330 protein, cysteine proteinase inhibitor protein, SerpinA1 protein, MGC23330 protein, A1AT protein, AAT protein, Antitrypsin protein, PI protein, Serine proteinase inhibitor protein, Alpha 1 antiproteinase protein, alpha1 PI protein, alpha 1 AT protein, PI1 protein, SERP1NA1 protein, alpha1 proteinase inhibitor protein