Cystatin S (CST4) (NM_001899) Human Recombinant Protein

Specifications

Product Data
Species	Human
Expression Host	HEK293
Expression cDNA Clone or AA Sequence	Protein Sequence (showhide) Ser21-Ala141
Tag	C-His
Predicted MW	15.2 kDa
Concentration	lot specific
Purity	>95% as determined by SDS-PAGE and Coomassie blue staining
Buffer	Provided lyophilized from a 0.2 μm filtered solution of 20 mM Tris-HCl, 150 mM NaCl
Storage	Store at -80°C.
Stability	Stable for at least 6 months from date of receipt under proper storage and handling conditions.
Endotoxin	< 0.1 EU per µg protein as determined by LAL test
Reference Data
RefSeq	NP_001890
Locus ID	1472
UniProt ID	P01036
Cytogenetics	20p11.21
Summary	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. The cystatin locus on chromosome 20 contains the majority of the type 2 cystatin genes and pseudogenes. This gene is located in the cystatin locus and encodes a type 2 salivary cysteine peptidase inhibitor. The protein 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. [provided by RefSeq, Jul 2008]

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