Kinetic studies on the interaction of streptokinase and other plasminogen activators with plasminogen and fibrin

Abstract
The activation of Lys-plasminogen to plasmin by streptokinase was promoted by soluble fibrin such that Km was decreased and Vmax increased. Enhancement was also observed when Glu-plasminogen was the substrate and was shared by the preformed streptokinase-plasminogen activator complex, indicating that the stimulation was not exerted primarily on the rate of active site formation.