After reconstitution, the protein solution is stable at -20 degree C for 3 months, at 2-8 degree C for up to 1 week.
Background: Cystatin E/M encoded by the CST6 gene is a member of family 2 of the cystatin superfamily. 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. However, its protein was found only in skin and sweat glands by a third group. In addition to being a cysteine protease inhibitor, cystatin E/M is also a substrate for transglutaminases. 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. 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.
NCBI and Uniprot Product Information
NCBI Description
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 the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions, where they appear to provide protective functions. This gene encodes a cystatin from the type 2 family, which is down-regulated in metastatic breast tumor cells as compared to primary tumor cells. Loss of expression is likely associated with the progression of a primary tumor to a metastatic phenotype. [provided by RefSeq, Jul 2008]
Uniprot Description
CST6: Shows moderate inhibition of cathepsin B but is not active against cathepsin C. Belongs to the cystatin family.
Protein type: Secreted; Motility/polarity/chemotaxis; Secreted, signal peptide
Chromosomal Location of Human Ortholog: 11q13
Cellular Component: cornified envelope
Molecular Function: cysteine protease inhibitor activity
Biological Process: anatomical structure morphogenesis; epidermis development
Research Articles on CST6
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Product Notes
The CST6 cst6 (Catalog #AAA9141700) is an Active Protein produced from HEK293 Cells and is intended for research purposes only. The product is available for immediate purchase. The amino acid sequence is listed below: RPQERMVGEL RDLSPDDPQV QKAAQAAVAS YNMGSNSIYY FRDTHIIKAQ SQLVAGIKYF LTMEMGSTDC RKTRVTGDHV DLTTCPLAAG AQQEKLRCDF EVLVVPWQNS SQLLKHNCVQ M. It is sometimes possible for the material contained within the vial of "CST6, Active Protein" to become dispersed throughout the inside of the vial, particularly around the seal of said vial, during shipment and storage. We always suggest centrifuging these vials to consolidate all of the liquid away from the lid and to the bottom of the vial prior to opening. Please be advised that certain products may require dry ice for shipping and that, if this is the case, an additional dry ice fee may also be required.Precautions
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