Stress protein produced under hyperthermal stress conditions. Serves as a glutamine and lysine donor substrate for transglutaminase. Inhibits the cysteine proteases papain and bromelain as well as the bovine serine protease trypsin. Has hardly any or no effect on subtilisin, bovine chymotrypsin, proteinase K from T.album, transglutaminase-activating metalloproteinase (TAMEP) from S.mobaraensis, dispase from B.polymyxa, thermolysin from B.thermoproteolyticus or collagenase from C.histolyticum. Thermostable. Activity is stable between 20-40 degrees Celsius. Retains about 70% activity after 60 min at 100 degrees Celsius. Monomer. By heat stress.