Inhibitor of serine proteases chymotrypsin, papain and trypsin. Has strong antifungal activity against C.albicans and R.solani. Has antibacterial activity against the Gram-positive bacterium C.michiganense, but lacks antibacterial activity against the Gram-positive bacterium S.aureus. Lacks hemolytic activity against human erythrocytes. Belongs to the protease inhibitor I20 (potato type II proteinase inhibitor) family.