Inhibits papain, ficin and bromelain with an IC(50) of 0.09 uM, 0.115 uM and 0.113 uM respectively. Has antibacterial activity against Gram-positive bacteria S.aureus and S.hemolyticus, and against the Gram-negative bacterium E.coli. Reduced antibacterial activity against Gram-positive bacterium B.subtilis. No antibacterial activity against the Gram-negative bacterium P.fluorescens. Glycosylated. Stable in the pH range 5.0-9.0 at 37 degrees Celsius. Stable when incubated in the temperature range 25-75 degrees Celsius and pH 7.5. Belongs to the cystatin family.