Metalloproteinase that binds to von Willebrand factor (VWF) and induces its interaction with GPIb (GP1BA), resulting in platelet aggregation. Binds 1 zinc ion per subunit. Monomer. Botrocetin and vWF form a soluble complex. Expressed by the venom gland. There are two distinct forms of the vWF-dependent platelet coagglutinin. The dimeric form (snaclec) is 34-fold more active than the metalloprotease botrocetin in promoting vWF binding to platelets (PubMed:1993206). Belongs to the venom metalloproteinase (M12B) family. P-III subfamily. P-IIIb sub-subfamily.