| Abstract: | The compositions of the proteolytic complexes of the venoms of the crotalid Agkistrodon halys halysand the viperid Echis multisquamatushave been investigated with the aid of a large number of specific natural and model substrates. A comparative analysis of the results obtained has revealed a predominance in the crotalid venom of fibrinogen-hydrolyzing enzymes, while the viperid venom is characterized as a procoagulant of the prothrombin-activating type. Among the fibrinogenases of the crotalid venom, a thrombin-like enzyme and a plasmin-like proteinase have been revealed and obtained in a purified state. A prothrombin-activating enzyme from the viperid venom has been isolated in the purified state and characterized with the aid of specific substrates. |
