Recombinant Human C1qR1/CD93 Fc Chimera Protein, CF Summary
Product Specifications
| Human C1q R/CD93 (Ala24-Lys580) Accession # Q9NPY3 |
IEGRMD | Human IgG1 (Pro100-Lys330) |
| N-terminus | C-terminus | |
Analysis
Product Datasheets
Carrier Free
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.
2379-CD
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute at 500 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.
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Reconstitution Calculator
Background: C1qR1/CD93
C1q R1, also known as CD93 and C1q Rp, is an approximately 125 kDa transmembrane glycoprotein that is involved in various aspects of inflammatory reactions (1). Mature human CD93 consists of a 557 amino acid (aa) extracellular domain (ECD) with one C‑type lectin domain, four tandem EGF‑like domains, and a mucin‑like domain, followed by a 21 aa transmembrane segment and a 51 aa cytoplasmic domain (2, 3). Within the ECD, human CD93 shares 65% aa sequence identity with mouse and rat CD93. It is distinct from the 60 kDa Calreticulin which is likewise known as C1q R1 (4, 5). Unlike Calreticulin, and despite its name, C1q R1/CD93 does not appear to bind the complement protein C1q (3, 5). CD93 is expressed by vascular endothelial cells (5) and by a variety of hematopoietic cells (3‑9). Various sized fragments of soluble CD93 (50‑75 kDa) can be shed from monocytes, neutrophils, and vascular endothelial cells following inflammatory stimulation, leaving a residual stub in the membrane (11‑13). Cross‑linking of cell surface CD93 enhances phagocytosis by monocytes and enhances the uptake of apoptotic cells in vivo (10, 15). Soluble CD93 promotes the differentiation of monocytes to macrophages, phagocytosis of apoptotic cells, and inflammatory responsiveness to multiple TLR ligands (12, 14). It is required for plasma cell longevity in the bone marrow and for the resulting extended humoral response (9).
- Greenlee-Wacker, M.C. et al. (2012) Curr. Drug Targets 13:411.
- Nepomuceno, R.R. et al. (1997) Immunity 6:119.
- Steinberger, P. et al. (2002) J. Leukoc. Biol. 71:133.
- Nepomuceno, R.R. and A.J. Tenner (1998) J. Immunol. 160:1929.
- McGreal, E.P. et al. (2002) J. Immunol. 168:5222.
- Lovik, G. et al. (2001) Scand. J. Immunol. 53:410.
- Danet, G.H. et al. (2002) Proc. Natl. Acad. Sci. USA 99:10441.
- Ikewaki, N. et al. (2010) J. Clin. Immunol. 30:723.
- Chevrier, S. et al. (2009) Proc. Natl. Acad. Sci. USA 106:3895.
- Norsworthy, P.J. et al. (2004) J. Immunol. 172:3406.
- Bohlson, S.S. et al. (2005) J. Immunol. 175:1239.
- Greenlee, M.C. et al. (2009) Inflamm. Res. 58:909.
- Greenlee-Wacker, M.C. et al. (2011) J. Immunol. 187:3353.
- Jeon, J.W. et al. (2010) J. Immunol. 185:4921.
- Nepomuceno, R.R. et al. (1999) J. Immunol. 162:3583.
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