Purification and characterization of a Kunitz-type trypsin inhibitor from Leaf-nosed viper venom

A Kunitz-type trypsin inhibitor was purified from Leaf-nosed viper venom and the primary structure determined by peptide analysis. In relation to other trypsin inhibitors, the protein has an extended C-terminal segment and a distinct pattern of residue alterations at the functionally important contact sites with proteases.