title: Sensitivity and specificity of plasma serine protease chromogenic substrates.
abstract: Rates of hydrolysis of the newly developed peptide chromogenic substrates S-2160, S-2238, S-2222 and S-2251 and Chromozym TH were tested against highly purified preparations of human plasmin, bovine trypsin, human alpha-thrombin, and bovine factor Xa. S-2160, S-2238, and chromozym TH are sensitive to thrombin, Chromozym TH and S-2238 exhibiting a substantially greater sensitivity than S-2160. All three substrates are insensitive to factor Xa but hydrolyzed to varying degrees by plasmin and trypsin. In contrast, S-2222 is sensitive to factor Xa and insensitive to thrombin. S-2251 is relatively plasmin-specific. In addition, the substrate Chromozym PK was evaluated and found to be relatively specific for plasma kallikrein. Clinically useful assays for antithrombin III and heparin using S-2222 as the substrate and factor Xa as the enzyme, plasma plasminogen and plasmin inhibitors using S-2251 as the substrate, and plasma prekallikrein and kallikrein inhibitors using Chromozym PK as the substrate have been developed.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001777:Blood Coagulation; D002417:Cattle; D005341:Fibrinolysin / Q000494:pharmacology; D006801:Humans; D007616:Kaolin / Q000494:pharmacology; D010447:Peptide Hydrolases; D010958:Plasminogen / Q000037:antagonists & inhibitors; D011288:Prekallikrein; D012694:Serine; D013300:Streptokinase / Q000494:pharmacology; D013917:Thrombin / Q000494:pharmacology; D014357:Trypsin / Q000494:pharmacology; D014568:Urokinase-Type Plasminogen Activator / Q000494:pharmacology
chemical_list: D007616:Kaolin; D012694:Serine; D010958:Plasminogen; D011288:Prekallikrein; D010447:Peptide Hydrolases; D013300:Streptokinase; D014357:Trypsin; D013917:Thrombin; D005341:Fibrinolysin; D014568:Urokinase-Type Plasminogen Activator