The Recombinant Human Cystatin-A/CSTA Protein is a biologically active recombinant protein that plays a significant role in various cellular processes and signaling pathways in human biology. This protein is widely employed in immunological research, cell biology studies, protein-protein interaction analyses, and therapeutic development, providing researchers with a reliable tool for investigating Cystatin-A/CSTA function and its implications in health and disease.
This product (SKU: RPCB0213) is produced using E. coli and features a C-His tag for convenient detection and purification. The protein exhibits a calculated molecular weight of 11.85 kDa with an observed molecular weight of 14 kDa under denaturing conditions, achieving ≥ 95 % as determined by SDS-PAGE.. Functional bioactivity has been validated through rigorous quality control assays, confirming its suitability for demanding research applications.
High quality, high purity and low endotoxin recombinant Recombinant Human Cystatin-A/CSTA Protein (RPCB0213), tested reactivity in E. coli and has been validated in SDS-PAGE.100% guaranteed.
Endotoxin:
< 1 EU/μg of the protein by LAL method.
Purity:
≥ 95 % as determined by SDS-PAGE.
Formulation:
Lyophilized from a 0.22 μm filtered solution of 20mM Tris, 150mM NaCl, pH 8.0.Contact us for customized product form or formulation.
Bio-Activity:
Measured by its ability to inhibit papain cleavage of a fluorogenic peptide substrate Z-FR-AMC. The IC50 value is <0.7 nM.
Reconstitution:
Centrifuge the vial before opening. Reconstitute to a concentration of 0.1-0.5 mg/mL in sterile distilled water. Avoid vortex or vigorously pipetting the protein. For long term storage, it is recommended to add a carrier protein or stablizer (e.g. 0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose), and aliquot the reconstituted protein solution to minimize free-thaw cycles.
Storage:
Store at -20℃.Store the lyophilized protein at -20℃ to -80 ℃ up to 1 year from the date of receipt. After reconstitution, the protein solution is stable at -20℃ for 3 months, at 2-8℃ for up to 1 week.
The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors, while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily, including the type 1 cystatins (stefins), type 2 cystatins, and kininogens. This gene encodes a stefin that functions as a cysteine protease inhibitor, forming tight complexes with papain and the cathepsins B, H, and L. The protein is one of the precursor proteins of cornified cell envelope in keratinocytes and plays a role in epidermal development and maintenance. Stefins have been proposed as prognostic and diagnostic tools for cancer.
Recombinant Human Cystatin-A/CSTA Protein was determined by SDS-PAGE under reducing conditions with Coomassie Blue.
Recombinant Human OSM inhibits papain cleavage of a fluorogenic peptide substrate Z-FR-AMC. The IC50 value is <0.7 nM.
