The Fibrinolytic Activity of Staphylokinase Mutants in the Fibrin Plate Assay
1995
The fibrinolytic activity of the new plasminogen activator, recombinant staphylokinase, was compared to that of streptokinase and tissue-type plasminogen activator in the fibrin plate assay. The pattern of fibrinolysis by staphylokinase on fibrin plates differs from the other plasminogen activators. A number of mutants of staphylokinase with various amino acids in position 26 substituted for methionine in wild-type staphylokinase were compared with respect to their fibrinolytic potencies. Only the mutants with cysteine or leucine in this position have a fibrinolytic activity comparable to wild-type staphylokinase. The results on the fibrinolytic activities in the fibrin plate assay correlate with those of a plasmin generation assay, the latter is, however, less sensitive.
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