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  • Title: Inhibition of bovine factor IXa and factor Xabeta by antithrombin III.
    Author: Kurachi K, Fujikawa K, Schmer G, Davie EW.
    Journal: Biochemistry; 1976 Jan 27; 15(2):373-7. PubMed ID: 1247523.
    Abstract:
    Factor IXa and factor Xabeta are serine proteases which participate in the middle phase of blood coagulation. These two enzymes are inhibited by antithrombin III by the formation of an enzyme-inhibitor complex containing 1 mol of enzyme and 1 mol of antithrombin III. The complex was readily demonstrated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and loss of coagulant or esterase activity at increasing concentrations of inhibitor. The inactivation of factor IXa by antithrombin III was relatively slow, but the reaction was greatly accelerated by the addition of heparin.
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