Cystatin F / CST7 Protein, Human, Recombinant (His Tag)

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Cystatin F / CST7 Protein, Human, Recombinant (His Tag): Product Information

Purity
> 92 % as determined by SDS-PAGE
Endotoxin
< 1.0 EU per μg of the protein as determined by the LAL method
Activity
Measured by its ability to inhibit active Cathepsin L cleavage of a fluorogenic peptide substrate Z-LR-AMC (R&D Systems, Catalog # ES008). The IC50 value is <6 nM.
Protein Construction
A DNA sequence encoding the human Cystatin F precursor (NP_003641.3) (Met 1-His 145) was expressed,with a polyhistidine tag at the C-terminus.
Accession#
Expressed Host
HEK293 Cells
Species
Human
Predicted N Terminal
Gly 20
Molecule Mass
Cystatin F exists as a disulfide-linked homodimer. The human cystatin F monomer consists of 137 amino acids and and has a predicted molecular mass of 16.1 kDa. As a result of glycosylation, the recombinant Cystatin F migrates as an approximately 44 kDa band in SDS-PAGE under non-reduced conditions corresponding to the dimmer.
Formulation
Lyophilized from sterile PBS, pH 7.4
1. Normally 5 % - 8 % trehalose, mannitol and 0.01% Tween80 are added as protectants before lyophilization. Specific concentrations are included in the hardcopy of COA.
2. Please contact us for any concerns or special requirements.
Please refer to the specific buffer information in the hard copy of CoA.
Shipping
In general, recombinant proteins are provided as lyophilized powder which are shipped at ambient temperature.
Bulk packages of recombinant proteins are provided as frozen liquid. They are shipped out with blue ice unless customers require otherwise.
Stability & Storage
Samples are stable for up to twelve months from date of receipt at -70℃
Store it under sterile conditions at -20℃ to -80℃. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.
Reconstitution
A hardcopy of COA with reconstitution instruction is sent along with the products. Please refer to it for detailed information.

Cystatin F / CST7 Protein, Human, Recombinant (His Tag): Images

Cystatin F / CST7 Protein, Human, Recombinant (His Tag): Alternative Names

CMAP Protein, Human

Cystatin F / CST7 Background Information

The cystatin superfamily members are important natural cysteine protease inhibitors present in a wide variety of organisms and are divided into three classes. Cystatin F, also known as leukocystatin and CMAP (Cystatin-like Metastasis-Associated Protein), is a type 2 cystatin and its expression is limited to hematopoietic cells, with the highest expression levels being observed in monocytes, dendritic cells, and certain types of T-cells. Furthermore, cystatin F mRNA becomes up-regulated during dendritic cell maturation, and thus suggests a specific role of cystatin F in immune regulation. Cystatin F is produced as a dimer, an inactive cathepsin inhibitor which is activated by chemical reduction. In addition, Cystatin F and its homologues have been observed expressing in various human cancer cell lines established from malignant tumors, and thus indicates a new diagnosis and prevention approach of certain human carcinomas metastasis.
Full Name
cystatin F (leukocystatin)
References
  • Halfon S., et al.,(1998), Leukocystatin, a new class II cystatin expressed selectively by hematopoietic cells. J. Biol. Chem. 273:16400-16408.
  • Ni J., et al., (1998), Cystatin F is a glycosylated human low molecular weight cysteine proteinase inhibitor.J. Biol. Chem. 273:24797-24804.
  • Morita M., et al.,(2000), Genomic construct and mapping of the gene for CMAP (leukocystatin/cystatin F, CST7) and identification of a proximal novel gene, BSCv (C20orf3).Genomics 67:87-91.
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