Cystatin S/CST4 Protein(C-6His) (recombinant human)

Protein Construction: Recombinant Human Cystatin S is produced by our Mammalian expression system and the target gene encoding Ser21-Ala141 is expressed with a 6His tag at the C-terminus. Sequence: Ser21-Ala141. Fusion tag: C-6His Endotoxin: < 1.0 EU per µg as determined by the LAL method. Apparent Molecular Mass: 16 kDa. Protein function: Cystatin-S, also called Cystatin-SA-III or Salivary acidic protein, is usually expressed in submandibular and sublingual saliva but not in parotid saliva(at protein level). This protein, which is phosphorylated at both its N- and C-terminal regions, belongs to the cystatin family. Cystatin-S can function as an inhibitor to papain or ficin, it partially inhibits stem bromelain and bovine cathepsin C. Protein function: This protein strongly inhibits papain and ficin, partially inhibits stem bromelain and bovine cathepsin C, but does not inhibit porcine cathepsin B or clostripain. Papain is inhibited non-competitively. [The UniProt Consortium]