Recombinant Human IL-1 RI Fc Chimera Protein, CF Summary
|Human IL-1 RI|
Accession # P14778.1
|IEGRMD||Human IgG1 Fc|
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 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.
When Recombinant Human IL-1 RI Fc Chimera Protein (Catalog # 11085-RI) is immobilized at 0.5 µg/mL (100 µL/well), Recombinant Human IL-1 beta /IL-1F2 (201-LB) binds with an ED50 of 0.600-5.40 ng/mL.
2 μg/lane of Recombinant Human IL‑1 RI Fc Chimera Protein (Catalog # 11085-RI) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 80-90 kDa and 160-180 kDa, respectively.
Background: IL-1 RI
The type I IL-1 receptor (IL-1 RI, designated IL-1 R1 and CD121a) is one of at least nine members of the IL-1 R family within the Toll/IL-1 R (TIR) superfamily (1 - 3). IL-1 RI is an 80 kDa type I transmembrane (TM) protein that binds the pleiotropic cytokines IL-1 alpha and IL-1 beta, plus the IL-1 receptor antagonist (IL-1 Ra). Signal transduction requires complex formation with the IL-1 R accessory protein (IL-1 R AcP/IL-1 R3), another type I TM protein (1, 2). This complex recruits the adaptor protein MyD88, to initiate signaling in the NF kappa B pathway (4, 5). Human IL-1 RI cDNA encodes a 569 amino acid (aa) protein that contains a 17 aa signal sequence, a 319 aa extracellular domain (ECD) with three C2-type Ig-like domains, a 20 aa TM domain and a 213 aa cytoplasmic region with a TIR domain. Within the ECD domain, human IL-1 RI shares 63% and 64% aa identity with mouse and rat IL-1 RI, respectively. The role of IL-1 in inflammation is under several levels of control, including expression and activation of IL-1 alpha and IL-1 beta, expression of IL-1 RI and its accessory and adaptor proteins, and inhibitory IL-1 R isoforms and decoys (1 - 5). IL-1 RI is expressed predominantly by T cells, fibroblasts, and endothelial cells and mediates acute phase inflammatory responses including fever (1, 2, 5, 6).
- Boraschi, D. & A. Tagliabue (2006) Vitam. Horm. 74:229.
- Dinarello, C.A. (2002) Clin. Exp. Rheumatol. 20:S1.
- Hart, R.P. et al. (1993) J. Neuroimmunol. 44:49.
- Brikos, C. et al. (2007) Mol. Cell. Proteomics 6:1551.
- Gasse, P. et al. (2007) J. Clin. Invest. 117:3786.
- Ching, S. et al. (2007) J. Neurosci. 27:10476.
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