Snake venom zinc metalloproteinase that causes hemorrhage by provoking the degradation of the sub-endothelial matrix proteins (fibronectin, laminin, type IV collagen, nidogen, and gelatins). Cleavage of 5-His-|-Leu-6, 10-His-|-Leu-11, 14-Ala-|-Leu-15, 16-Tyr-|-Leu-17 and 23-Gly-|-Phe-24 of insulin B chain. With small molecule substrates prefers hydrophobic residue at P2' and small residue such as Ala, Gly at P1. Binds 1 zinc ion per subunit. Monomer. Expressed by the venom gland. The N-terminus is blocked. Belongs to the venom metalloproteinase (M12B) family. P-I subfamily.