Recombinant Streptokinase protein

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

Streptokinase also known as SK is a bacterial protein produced by certain strains of Streptococcus bacteria. With a molecular mass of approximately 47 kDa this protein acts by activating the human plasminogen to convert into plasmin an important enzyme in the breakdown of blood clots. Streptokinase is secreted extracellularly by bacteria as part of their defense mechanism to spread infection by reducing the efficacy of blood clots which can isolate bacteria from tissues.

Biological function summary

The protein functions as a potent plasminogen activator in the fibrinolytic system. It does this by forming a complex with plasminogen facilitating the conversion to plasmin. This interaction is not part of a larger protein complex but instead centers on the proteolytic action that occurs upon binding. The activity of streptokinase is naturally regulated by its synthesis and secretion from the bacteria during infection processes.

Pathways

Streptokinase is deeply involved in the fibrinolytic pathway. This pathway is critical in maintaining the balance between clot formation and dissolution. It is closely related to other fibrinolytic factors such as tissue plasminogen activator (tPA) which also converts plasminogen to plasmin but through a different mechanism. Both play unique roles in the proteolytic pathway ensuring precise regulation of clot removal.

Streptokinase has therapeutic applications particularly in the treatment of thrombotic disorders such as myocardial infarction and pulmonary embolism. It acts as a thrombolytic agent dissolving clots that obstruct the blood flow. The protein is sometimes compared to urokinase another clot-dissolving enzyme which shares a similar function in dissolving blood clots but is derived from human sources. These characteristics make streptokinase a valuable resource in the medical field for managing acute thrombotic events.