Potentiates the contractile activity of bradykinin on the isolated guinea-pig ileum. Inhibits the hydrolysis of bradykinin by angiotensin-converting enzyme (ACE) and also inhibits the conversion of angiotensin I to angiotensin II by kininase II from guinea-pig ileum tissue. Also increases the depressor effect of bradykinin on arterial blood pressure in the anaesthetized rat. Expressed by the venom gland. Belongs to the non-disulfide-bridged peptide (NDBP) superfamily. Scorpion BPP (group 1) family.