Ser190-containing trypsin-like serine proteases

Ser190-containing trypsin-like serine proteases are a functionally diverse group of enzymes belonging to the S1 peptidase family, defined by the presence of a serine residue at position 190 (chymotrypsin numbering) in the S1 binding pocket (PubMed: 7756981). This specific residue is a major determinant of substrate recognition and inhibitor binding, often forming critical hydrogen bonds with the P1 residue of substrates or synthetic inhibitors (Journal of Biological Chemistry: 277, 24508). Prominent members of this group include key coagulation factors such as Thrombin (Factor IIa), Factor Xa, Factor VIIa, and Factor XIa, as well as other enzymes like urokinase and activated protein C (UniProt: P00742, P00415). These proteases play vital roles in physiological processes including blood clotting, fibrinolysis, and the complement system, making them high-priority targets for therapeutic intervention in cardiovascular and inflammatory diseases (NIH: StatPearls - Anticoagulation). Pharmacological agents targeting these enzymes, such as direct oral anticoagulants (DOACs) like rivaroxaban and dabigatran, function by binding to the active site and competitively inhibiting the cleavage of natural substrates like fibrinogen or prothrombin (PubChem: 9875401, 216210). However, the high degree of structural conservation among these proteases presents a significant challenge for drug selectivity, and the primary clinical risk associated with their inhibition is the potential for life-threatening bleeding complications (NEJM: 361, 1139).

Other names

S1 family serine proteasesChymotrypsin-like serine proteasesSer190 proteasesS1 peptidase family

Direct competitive inhibition of the catalytic active site, specifically interacting with the S1 binding pocket to prevent the cleavage of physiological substrates.