Shows nociceptive, edema-inducing and kininogenase activity with release of kallidin from low molecular weight kininogen. The cleavage occurs at Met-Lys bonds. Inhibited by tissue-kallikrein inhibitor TKI and trasylol. Plasma kallikrein inhibitor PKSI527 and classical inhibitors of serine-, metallo-, thiol- or aspartate-peptidases evokes a minor inhibition of the peptide digestion. Expressed by the venom gland. Belongs to the natterin family.