although ferritin is normally quite resistant to proteolysis , the 22-kda protein is easily generated from the 28-kda form by treatment with subtilisin , suggesting the presence of a specific , protease-sensitive sequence on the protein 's surface , possibly used to mark the phytoferritin for conversion to hemosiderin and construction of ferritin crystalline arrays .
C0597304
proteolysis
C0030946
protease