Coagulation factor IIa (Thrombin) (F2a)

Thrombin, or activated Coagulation Factor II, is a multifunctional serine protease that serves as the terminal enzyme in the blood coagulation cascade (UniProt P00734). It is produced from the cleavage of prothrombin by the prothrombinase complex on the surface of activated platelets (StatPearls, 2023). Thrombin's most critical role is the conversion of soluble fibrinogen into insoluble fibrin strands, which polymerize to form the primary structural network of a blood clot (PubMed, PMID: 15507111). Additionally, thrombin amplifies its own production by activating upstream factors and triggers platelet activation via protease-activated receptors (PARs) (NIH, 2022). Because of its central position in hemostasis and thrombosis, thrombin is a primary target for anticoagulant therapies aimed at preventing stroke, myocardial infarction, and venous thromboembolism (PubChem).

Other names

ThrombinFactor IIaActivated coagulation factor IIF2Fibrinogenase

Direct thrombin inhibitors (DTIs) bind to the active site or exosites of thrombin to block its enzymatic activity (PubMed, PMID: 11707184). Indirect inhibitors like heparin bind to antithrombin III, accelerating its inhibition of thrombin (StatPearls, 2023).