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| 【主 题】 ： |
Recombinant Human Cystatin S, His-tagged |
| 【联系人名】 ： |
Candy Ton |
| 【电子邮件】 ： |
yuanyuanton@gmail.com |
| 【联系电话】 ： |
1-631-5599269 |
| 【发布日期】 ： |
2015-1-26 |
| 【详细说明】 ： |
Product Overview
Recombinant Human CST4 (Met 1-Ala 141), fused with a polyhistidine tag at the C-terminus, was expressed in Human cells.
Description
Cystatin-S, also known as Cystatin-4, Salivary acidic protein 1, Cystatin-SA-III and CST4, is a secreted protein which belongs to the cystatin family. Cystatin-4 / CST4 is expressed in submandibular and sublingual saliva but not in parotid saliva (at protein level). It is also expressed in saliva, tears, urine and seminal fluid. 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. Cystatin-4 / CST4 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. Cystatin-4 / CST4 is an S-type cystatin, based on its high level of expression in saliva, tears and seminal plasma. The specific role in these fluids is unclear but antibacterial and antiviral activity is present, consistent with a protective function.
Purity
> 98 % as determined by SDS-PAGE
Endotoxin
< 1.0 EU per μg of the protein as determined by the LAL method
Stability
Samples are stable for up to twelve months from date of receipt at -70℃ |
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