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  • Title: Isolation and characterization of rabbit plasma alpha-1-antiproteinase E.
    Author: Saito A, Sinohara H.
    Journal: Biol Chem; 1998 Nov; 379(11):1367-70. PubMed ID: 9865611.
    Abstract:
    Alpha-1-antiproteinase E, the fourth isoform of rabbit alpha-1-antiproteinase (alpha-1-antitrypsin) having a glutamic acid at the reactive center, has been purified from the plasma by sequential chromatography on hydroxyapatite and anion-exchange columns. The E form of alpha-1-antiproteinase formed a complex with trypsin, chymotrypsin, elastase, plasmin and pancreatic kallikrein as judged by SDS-PAGE. The E form inhibited elastase in a stoichiometric manner and chymotrypsin moderately, but the inhibition of trypsin was gradual. The F form inhibited trypsin most effectively followed by chymotrypsin and elastase. N-chlorosuccinimide reduced the elastase inhibitory activity of the E form, while the F form was more effectively inactivated by the oxidant.
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