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JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Inhibition of activated factor XII by antithrombin-heparin cofactor.
Journal of Biological Chemistry 1976 November 11
The activation of Factor XII occurs via fragmentation of this zymogen into a diverse spectrum of enzymatically potent molecular species. To study the interaction of antithrombin-heparin cofactor and heparin with activated Factor XII, we have employed two forms of this enzyme with widely differing physical characteristics and biologic potencies. Antithrombin-heparin cofactor was found to be a progressive, time-dependent inhibitor of both forms. The addition of heparin dramatically accelerated the rates of these interactions. Furthermore, sodium dodecyl sulfate gel electrophoresis of reduced proteins has indicated that antithrombin-heparin cofactor functions by forming an undissociable complex with either species of the enzyme. This complex represents a 1:1 stoichiometric combination of activated Factor XII and inhibitor. In the presence of heparin, both species undergo virtually instantaneous complex formation with antithrombin-heparin cofactor without exhibiting alterations in dissociability or stoichiometry.
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