分子别名（Synonym）
IL2RB,RP5-1170K4.6,CD122,P70-75
表达区间及表达系统（Source）
Human IL-2 R beta, His Tag (SPR verified) (CD2-H5221) is expressed from human 293 cells (HEK293). It contains AA Ala 27 - Asp 239 (Accession # NP_000869.1).
Predicted N-terminus: Ala 27
蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the C-terminus.
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.
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
>90% as determined by SDS-PAGE.
制剂（Formulation）
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.
重构方法（Reconstitution）
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
存储（Storage）
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.
电泳（SDS-PAGE）
Human IL-2 R beta, His Tag (SPR verified) on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 90%.
获取HPLC数据
活性（Bioactivity）-SPR
Human IL-2 R beta, His Tag (SPR verified) (Cat. No. CD2-H5221) captured on CM5 chip via anti-His antibody, can bind Human IL-2, Tag Free (Cat. No. IL2-H4113) with an affinity constant of 0.525 μM as determined in a SPR assay (Biacore T200) (QC tested).
Protocol
Human IL-2 R beta, His Tag (SPR verified) (Cat. No. CD2-H5221) captured on CM5 chip via anti-His antibody, can bind Human IL-15, Tag Free (Cat. No. IL5-H4117) with an affinity constant of 21.7 nM as determined in a SPR assay (Biacore T200) (Routinely tested).
Protocol
活性（Bioactivity）-BLI
Loaded Human IL-2 R beta, His Tag (SPR verified) (Cat. No. CD2-H5221) on HIS1K Biosensor, can bind Human IL-2, Tag Free (Cat. No. IL2-H4113) with an affinity constant of 0.46 μM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
活性（Bioactivity）-Cell based assay
Human IL-2 R beta, His Tag (SPR verified) (Cat. No. CD2-H5221) inhibits the IL-15-dependent proliferation of Mo7e cells. The EC50 for this effect is 0.38-0.45 µg/mL (Routinely tested).
Protocol
背景（Background）
Interleukin-2 receptor (IL-2R) is a heterotrimeric protein expressed on the surface of certain immune cells, such as lymphocytes, that binds and responds to a cytokine called IL-2. The IL-2R is made up of 3 subunits - α (CD25), β (CD122) and γ (CD132) - non-covalently associating. The α and β chains are involved in binding IL-2, while signal transduction following cytokine interaction is carried out by the γ-chain, along with the β subunit. CD122 is also known as IL2R beta, is a member of the type I cytokine receptor family. CD122 is the receptor for interleukin-2 and is involved in receptor mediated endocytosis and transduces the mitogenic signals of IL2.
