Abstract
Potent proteinase inhibitors, which inactivate bovine pancreatic trypsin, α-chymotrypsin, bovine plasma kallikrein and plasmin, were found in several snake venoms. The content of the inhibitor was highest in Vipera russelli venom. Proteinase inhibitors of the same type were demonstrated also in the venoms of five snakes of the Elapidae family; Hemachatus haemachatus (Ringhals cobra), Dendroaspis angusticeps (Green mamba), Dendroaspis polylepis (Black mamba), Naja nivea (Cape cobra) and Naja haje (Egyptian cobra). No proteinase inhibitors were demonstrated in several Crotalidae and Hydrophiidae venoms. Toxic polypeptides such as α-bungarotoxin, cytotoxin I and II ( Naja naja venom) and cardiotoxin ( Naja naja atra venom) did not show any inhibitory action on typical mammalian proteinases including trypsin, α-chymotrypsin, plasmin and kallikrein.
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