Cystatin E/M, also referred to as CST6, is a member of type 2 cysteine proteinase inhibitors of the cystatin superfamily, and inhibits papain and cathepsin B. Cystatin E is a low molecular mass secreted protein existing in both a glycosylated (17 kDa) and an unglycosylated (14 kDa) form, with two characteristic intrachain disulfide bridges. Expression of cystatin M/E is found to be restricted to the epidermis, more specifically in the stratum granulosum, sweat glands, sebaceous glands, and the hair follicles. In addition to its function as a cysteine protease inhibitor, cystatin M/E also serves as a target for cross-linking by transglutaminases. Accordingly, cystatin M/E was suggested to be involved in barrier formation and maintenance. Furthermore, studies have revealed that cystatin M/E is frequently epigenetically inactivated during breast carcinogenesis, and thus be regarded as a candidate of tumour suppressor gene.
Product Name:
Mouse Cystatin E/CST6 Recombinant Protein (RPES3884)
Product Code:
RPES3884
Size:
10µg
Species:
Mouse
Expressed Host:
HEK293 Cells
Synonyms:
1110017E11Rik,ichq,N28197
Accession:
NP_082899.1
Sequence:
Met 1-Ala 152
Fusion tag:
C-His
Activity:
Measured by its ability to inhibit papain cleavage of a fluorogenic peptide substrate ZFR-AMC,R&D Systems, Catalog # ES009.The IC50 is < 20 nM.
Endotoxin:
<1.0 EU per µg of the protein as determined by the LAL method.
Protein Construction:
A DNA sequence encoding the extracellular domain of mouse CST6 (NP_082899.1) (Met 1-Ala 152) was expressed, with a C-terminal polyhistidine tag.
Purity:
> 90 % as determined by SDS-PAGE
Mol Mass:
15.2 kDa
AP Mol Mass:
20 kDa
Formulation:
Lyophilized from sterile PBS, pH 7.4
Shipping:
This product is provided as lyophilized powder which is shipped with ice packs.
Stability and Storage:
Lyophilized proteins are stable for up to 12 months when stored at -20 to -80°C. Reconstituted protein solution can be stored at 4-8°C for 2-7 days. Aliquots of reconstituted samples are stable at < -20°C for 3 months.
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