Biotinylated Human IL-2 R alpha, His,Avitag (ILA-H82E6) is expressed from human 293 cells (HEK293). It contains AA Glu 22 - Cys 213 (Accession # P01589-1).
Predicted N-terminus: Glu 22
This protein carries a polyhistidine tag at the C-terminus, followed by an Avi tag.
The protein has a calculated MW of 25.4 kDa. The protein migrates as 35-45 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
Biotinylation of this product is performed using Avitag™ technology. Briefly, the single lysine residue in the Avitag is enzymatically labeled with biotin.
The biotin to protein ratio is 0.5-1 as determined by the HABA assay.
Less than 1.0 EU per μg by the LAL method.
>90% as determined by SDS-PAGE.
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
Contact us for customized product form or formulation.
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
For long term storage, the product should be stored at lyophilized state at -20°C or lower.
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
Biotinylated Human IL-2 R alpha, His,Avitag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 90%.
Immobilized Human IL-2, Tag Free (Cat. No. IL2-H4113) at 5 μg/mL (100 μL/well) can bind Biotinylated Human IL-2 R alpha, His,Avitag (Cat. No. ILA-H82E6) with a linear range of 10-156 ng/mL (QC tested).
Loaded Biotinylated Human IL-2 R alpha, His,Avitag (Cat. No. ILA-H82E6) on SA Biosensor, can bind Human IL-2, Tag Free (Cat. No. IL2-H4113) with an affinity constant of 70.2 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
活性（Bioactivity）-Cell based assay
Biotinylated Human IL-2 R alpha, His,Avitag (Cat. No. ILA-H82E6) inhibits the IL-2-dependent proliferation of Mo7e cells. The EC50 for this effect is 0.57-0.81 µg/mL (Routinely tested).
Interleukin-2 receptor subunit alpha (IL2RA) is also known as IL-2R subunit alpha, IL-2-RA, IL2-RA, TAC antigen, p55, CD antigen CD25, is a type I transmembrane glycoprotein. IL2RA is expressed on activated T cells and regulatory T cells, and is capable of binding IL2 with low affinity by itself. However, a ligand-induced high affinity heterotrimeric receptor complex is produced when IL2RA is associated non-covelently with the IL2 receptor beta and gamma chain, and subsequently initiates the intacellular signal pathways such as MAPK or JAK/STAT. On dendritic cells (DC), CD25 has been previously regarded as an activation marker, while both murine and human DC can express CD25, they do not express the beta-chain of the IL-2 receptor, which is indispensable for the execution of IL-2 signaling.