Recombinant Human Cystatin E/M Protein, CF
R&D Systems, part of Bio-Techne | Catalog # 1286-PI
Key Product Details
Product Specifications
Source
Mouse myeloma cell line, NS0-derived human Cystatin E/M protein
Arg29-Met149, with a C-terminal 10-His tag
Arg29-Met149, with a C-terminal 10-His tag
Purity
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
N-terminal Sequence Analysis
Arg29
Predicted Molecular Mass
15 kDa
SDS-PAGE
15 kDa and 21 kDa, reducing conditions
Activity
Measured by its ability to inhibit papain cleavage of a fluorogenic peptide substrate Z-FR-AMC (Catalog # ES009).
The IC50 value is approximately 7.0 nM, as measured under the described conditions.
The IC50 value is approximately 7.0 nM, as measured under the described conditions.
Reviewed Applications
Read 1 review rated 5 using 1286-PI in the following applications:
Formulation, Preparation and Storage
1286-PI
| Formulation | Lyophilized from a 0.2 μm filtered solution in MES and NaCl. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile 25 mM MES, 150 mM NaCl, pH 6.5. |
| Shipping | The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below. |
| Stability & Storage | Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Background: Cystatin E/M
Cystatin E/M encoded by the CST6 gene is a member of family 2 of the cystatin superfamily (1, 2). It inhibits papain and cathepsin B, two of the cysteine proteases. Its mRNA was found in many tissues by the two groups who did initial cloning (1, 2). However, its protein was found only in skin and sweat glands by a third group (3). In addition to being a cysteine protease inhibitor, cystatin E/M is also a substrate for transglutaminases (3). It is required for viability and for correct formation of cornified layers in the epidermis and hair follicles, as ichq mice, with a null mutation in the cystatin E/M gene, have defects in epidermal cornification and die between 5 and 12 days of age (4). Cystatin E/M expression and function may not be limited to cutaneous epithelia. For example, it is found in rat brain and is induced during neuronal cell differentiation (5).
References
- Sotiropoulou, G. et al. (1997) J. Biol. Chem. 272:903.
- Ni, J. et al. (1997) J. Biol. Chem. 272:10853.
- Zeeuwen, P.L. et al. (2001) J. Invest. Dermatol. 116:693.
- Zeeuwen, P.L. et al. (2002) Hum. Mol. Genet. 11:2867.
- Hong, J. et al. (2002) J. Neurochem. 81:922.
Alternate Names
CST6
Gene Symbol
CST6
UniProt
Additional Cystatin E/M Products
Product Documents for Recombinant Human Cystatin E/M Protein, CF
Product Specific Notices for Recombinant Human Cystatin E/M Protein, CF
For research use only
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