Responsible for constitutive and herbivore-induced simple nitrile formation. Promotes simple nitriles, but not epithionitrile or thiocyanate formation. Converts allylglucosinolate, 4-methylsulfinylbutylglucosinolate, 4-methylthiobutylglucosinolate and benzylglucosinolate to their corresponding simple nitriles in the presence of myrosinase. By herbivory. No simple nitriles produced. Not dependent on the presence of Fe(2+) or Fe(3+). Belongs to the jacalin lectin family.