Structure of the Carboxyl-Terminal Half of Human α2-Plasmin Inhibitor Deduced from That of cDNA

Abstract
A 1.7 kilobase cDNA clone isolated from a human liver cDNA library contained 822 nucleotides encoding the carboxyl-terminal 274 amino acid sequence of α2-plasmin inhibitor, a stop codon and a 3′ noncoding region of 0.9 kilobases. The amino acid sequence deduced from the cDNA shows 29–31% homology with those of other plasma protease inhibitors. The inhibitor's putative reactive-site peptide bond was Met-Ser, and the Met residue was located at the 91st position from the carboxyl-terminal end. The plasminogen bindlng site was located in the carboxylterminal region.