酶原怎么能和酶结合呢？

Tranexamic acid (TXA) is a synthetic lysine analog acting on plasminogen via competitive block of the lysine binding sites. TXA inhibits the binding of plasminogen (the proenzyme) to plasmin (i.e., blocking activation of plasmin) and it also inhibits the binding of plasmin (the active form) to fibrin (i.e., blocking fibrinolysis) [19].

氨甲环酸（TXA）是一种合成的赖氨酸类似物，通过竞争性阻断赖氨酸结合位点作用于纤溶酶原。TXA抑制纤溶酶原与纤溶酶的结合（即阻断纤溶酶的激活），也抑制纤溶酶（活性形式）与纤维蛋白的结合（即阻断纤维蛋白溶解）。

酶原怎么能和酶结合呢，应该是纤溶酶原向纤溶酶的转化吧？谢谢