It is similar to streptokinase. Staphylokinase is positively regulated by the “agr” gene regulator. It activates plasminogen to form plasmin, which digests fibrin clots. This disrupts the fibrin meshwork which forms to keep infections localized.

Staphylokinase (Sak), a protein secreted by many S. aureus strains [6], activates human plasminogen (h-plg) into plasmin [7]. Plasmin in turn digests fibrin clots and many components of extracellular matrix and basal membranes [8] and activates latent matrix metalloproteinases, leading to extensive proteolysis [8].

Fibrinolysin has two roles: to aid in the dissolution of the ejaculatory plug (made from seminal vesicle fluids) and to cause human semen to liquefy over time after clotting.

factor IX
Plasmin is released as a zymogen called plasminogen (PLG) from the liver into the factor IX systemic circulation.

As streptokinase is a bacterial product, the body has the ability to build up an immunity to it. Therefore, it is recommended that this medication should not be used again after four days from the first administration, as it may not be as effective and can also cause an allergic reaction.

: any of several proteolytic enzymes that promote the dissolution of blood clots especially : plasmin.

Fibrinolysin attacks and inactivates fibrin molecules occurring in undesirable exudates on the surface of the human body and on human mucosa, e.g., in superficial wounds and burns, while desoxyribonuclease targets and destroys (human) DNA.

Fibrinolysis is the process by which Fibrin is removed from damaged blood vessels. Fibrinolysis is also important in tissue remodelling/repair after injury and in tumour metastasis.

Fibrinolytic agents are the preferred pharmacologic class for the management of STEMI because of their ability to achieve reperfusion and to restore blood flow when administered within 12 hours of symptom onset.

The most physiologically active plasminogen activator is tissue plasminogen activator (tPA), its production and secretion are predominantly from endothelial cells. This activation occurs through cleavage of an Arg-Val peptide bond within plasminogen giving rise to the active protease, plasmin.