Seed storage protein (Probable). Globulin-like protein that acts as zinc metalloprotease. Cleaves specifically between Leu-15 and Tyr-16 of insulin B chain, and Gln-1 and Leu-2 of neurotensin (NT) peptide in vitro. May play a role as an initiating endopeptidase in germinating seeds (PubMed:27064905). Optimum pH is 4.0. Optimum temperature is 55 degrees Celsius. Homotrimer. Causes an allergic reaction in human. Binds to IgE. Belongs to the 7S seed storage protein family.