Inhibits angiotensin-converting enzyme (ACE), but does not serve as substrate for the enzyme. Potentiate bradykinin (BK) on the isolated guinea pig ileum as well as the isolated rat uterus for contraction. Also potentiates in vivo the depressor effect of BK on arterial blood pressure in the normotensive anesthetized rat. Intracerebroventricular injection into mice does not show toxic activity. Expressed by the venom gland. Belongs to the non-disulfide-bridged peptide (NDBP) superfamily. Scorpion BPP (group 1) family.