Snake venom zinc metalloprotease that causes mast cell degranulation and histamine release. Selectively degrades the alpha-chain of human fibrinogen (FGA). Binds 1 zinc ion per subunit. Inhibited by EDTA and EGTA, but not by PMSF and leupeptin. Monomer. Expressed by the venom gland. Glycosylated. Does not degrade the beta- and the gamma-chain of fibrinogen. Does not induce skin hemorrhage when subcutaneously injected into mice (5 or 50 ug) (PubMed:16310401). Belongs to the venom metalloproteinase (M12B) family. P-III subfamily. P-IIIa sub-subfamily.