Recombinant Cynomolgus Monkey VSIG4 Fc Chimera Protein, CF Summary
|Cynomolgus Monkey VSIG4|
Accession # XP_005593850.1
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
|Formulation||Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.|
|Reconstitution||Reconstitute at 200 μg/mL in PBS.|
|Shipping||The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.|
|Stability & Storage:||Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
Recombinant Cynomolgus Monkey VSIG4 Fc Chimera (Catalog # 10155-VS) inhibits anti-CD3 antibody induced IFN-gamma secretion by human T cells. The ED50 for this effect is 0.6-6 μg/mL.
2 μg/lane of Recombinant Cynomolgus Monkey VSIG4 Fc Chimera (Catalog # 10155-VS) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie Blue staining, showing bands at 67-76 kDa and 130-150 kDa, respectively.
VSIG4 (V-set and immunoglobulin domain containing 4), also known as CRIg and Z39IG, is a 45 kDa, type I transmembrane protein of the B7 family within the Ig superfamily that is expressed only in tissue-resident macrophages (1-4). The cynomolgus VSIG4 cDNA encodes 404 amino acids (aa) including a 24 aa signal sequence, a 264 aa extracellular domain (ECD) containing a V-type and a C2-type Ig domain, a 23 aa transmembrane domain and a 93 aa cytoplasmic domain (5). The cynomolgus VSIG4 ECD shares 94% aa identity with human VSIG4 ECD. VSIG4 is specifically expressed on macrophages in the thymic medulla, peritoneum, alveoli, synovia, adipose and heart, liver Kupffer cells, placental Hofbauer cells, and atherosclerotic foam cells (1-4, 6-9). It is absent on infiltrating macrophages (8). VSIG4 is a complement receptor that binds C3b and iC3b fragments, internalizes them to recycling endosomes, and is recycled to the cell surface (4, 6). It contributes significantly to innate immunity by binding and phagocytosis of complement-opsonized invading pathogens (4, 8, 10). Binding of either native or recombinant soluble VSIG4 to C3b inhibits complement amplification through the alternative, but not classical, pathway (10, 11). VSIG4 is also a negative regulator of mouse and human T cell activation (2). Although VSIG4 engagement may activate NF kappa B and thus be pro-inflammatory in some cases, many of its activities are important in resolving, rather than initiating, inflammation (1, 2, 7, 10, 11).
- He, J.Q. et al. (2008) Mol. Immunol. 4041.
- Vogt, L. et al. (2006) J. Clin. Invest. 116:2817.
- Langnaese, K. et al. (2000) Biochim. Biophys. Acta 1492:522.
- Helmy, K. et al. (2006) Cell 124:915.
- Entrez protein Accession # A0A2K5TW73, XP_005593850.
- Tanaka, M. et al. (2008) Clin. Exp. Immunol. 154:38.
- Lee, M-Y. et al. (2006) J. Leukoc. Biol. 80:922.
- Gorgani, N.N. et al. (2008) J. Immunol. 181:7902.
- Walker, M.G. (2002) Biochim. Biophys. Acta 1574:387.
- Wiesmann, C. et al. (2006) Nature 444:217.
- Katschke, K.J. et al. (2007) J. Exp. Med. 204:1319.
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