| Description : |
Interleukin 4 Receptor alpha (IL-4R alpha ), also known as CD124 and BSF receptor, is a widely expressed 140 kDa transmembrane glycoprotein in the class I cytokine receptor family. IL-4R alpha plays an important role in Th2-biased immune responses, alternative macrophage activation, mucosal immunity, allergic inflammation, tumor progression, and atherogenesis (1-5). Mature human IL-4R alpha consists of a 207 amino acid (aa) extracellular domain (ECD) that contains a cytokine binding region and one fibronectin type III domain, a 24 aa transmembrane segment, and a 569 aa cytoplasmic domain that contains one Box 1 motif and one ITIM motif (6, 7). Within the ECD, human IL-4R alpha shares 51% aa sequence identity with mouse and rat IL-4R alpha. Soluble forms of IL-4R alpha, generated by alternate splicing or proteolysis, retain ligand binding properties and inhibit IL-4 bioactivity (8-11). IL-4R alpha is a component of two distinct receptor complexes and shows species selectivity between human and mouse (6). It can associate with the common gamma chain ( gamma c) to form the IL-4 responsive type I receptor in which gamma c increases the affinity for IL-4 and enables signaling (12, 13). It can alternatively associate with IL-13R alpha 1 to form the type II receptor which is responsive to both IL-4 and IL-13 (14, 15). The use of shared receptor components contributes to the overlapping biological effects of IL-4 and IL-13 as well as other cytokines that utilize gamma c (i.e. IL-2, IL-7, IL-9, IL-15, and IL-21) (16, 17). |
| Source : |
HEK293 cells |
| Species : |
Human |
| Tag : |
Fc/Avi |
| Predicted N Terminal : |
Gly24 |
| Form : |
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. |
| Bio-activity : |
The biotin to protein ratio is greater than 0.7 as determined by the HABA assay. Measured by its ability to inhibit IL4-dependent proliferation of TF1 human erythroleukemic cells.The ED50 for this effect is 5-30 ng/mL in the presence 0.2 ng/mL of Recombinant Human IL4. When Biotinylated Recombinant Human IL4R Fc Chimera Avi-tag is captured , the concentration of Recombinant Human IL4 that produces 50% of the optimal binding response is approximately 3-20 ng/mL. |
| Molecular Mass : |
73-82 kDa, under reducing conditions |
| Protein length : |
Gly24-His232 |
| Endotoxin : |
<0.10 EU per 1 μg of the protein by the LAL method. |
| Purity : |
>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining. |
| Applications : |
Binding Activity, Bioactivity |
| Storage : |
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.12 months from date of receipt, -20 to -70 °C as supplied.1 month, 2 to 8 °C under sterile conditions after reconstitution.3 months, -20 to -70 °C under sterile conditions after reconstitution. |
| Reconstitution : |
Reconstitute at 250 μg/mL in PBS. |
