Abstract
When equimolar amounts of Glu-plasminogen (Glu-plg) and streptokinase (SK) were mixed in the presence of S-2251, SK-plg complex was formed and only gradually converted to SK-plasmin complex. When equimolar amounts of Glu-plg and SK were mixed with fibrinogen or fibrin, Glu-plg was converted faster to plasmin suggesting that Glu-plg molecule in the complex was converted to plasmin. It is thus concluded that SK-plg complex is converted to SK-plasmin complex slowly in the absence of fibrin or fibrinogen. When SK-plg-fibrin(ogen) complex was formed, plasminogen moiety was converted to plasmin faster inside a trimolecular complex of SK, plasminogen and fibrin(ogen).
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