积分兑换
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分子别名（Synonym）
CTLA4,CD152
表达区间及表达系统（Source）
Human CTLA-4, His Tag (CT4-H52H9) is expressed from human 293 cells (HEK293). It contains AA Ala 37 - Phe 162 (Accession # P16410-1).
Predicted N-terminus: Ala 37
Request for sequence蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the C-terminus.
The protein has a calculated MW of 18.8 kDa. The protein migrates as 25-30 kDa when calibrated against Star Ribbon Pre-stained Protein Marker under reducing (R) condition (SDS-PAGE) due to glycosylation.
偶联（Conjugate）
Unconjugated
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
90% as determined by SDS-PAGE.
90% as determined by SEC-MALS.
制剂（Formulation）
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.
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.
质量管理控制体系（QMS）
产品展示
电泳（SDS-PAGE）
Human CTLA-4, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 90% (With Star Ribbon Pre-stained Protein Marker).
SEC-MALS
The purity of Human CTLA-4, His Tag (Cat. No. CT4-H52H9) is more than 90% and the molecular weight of this protein is around 45-60 kDa verified by SEC-MALS.
Report
活性（Bioactivity）-ELISA
Immobilized Human B7-1, Fc Tag (Cat. No. B71-H5259) at 2 μg/mL (100 μL/well) can bind Human CTLA-4, His Tag (Cat. No. CT4-H52H9) with a linear range of 0.1-2 ng/mL (QC tested).
Protocol
Immobilized Human CTLA-4, His Tag (Cat. No.CT4-H52H9) at 2 μg/mL, add increasing concentrations of CTLA-4 x OX40 Bispecific Antibody in 50% Human serum and then add Biotinylated Human OX40, Avitag,His Tag (Cat. No. TN4-H82E4) at 1 μg/mL. Detection was performed using HRP-conjugated streptavidin with sensitivity of 4 ng/mL (Intact assay, Routinely tested).
Protocol
Immobilized Human CTLA-4, His Tag (Cat. No. CT4-H52H9) at 1 μg/mL (100 μL/well) can bind Ipilimumab with a linear range of 0.1-3 ng/mL (Routinely tested).
Protocol
活性（Bioactivity）-BLI
Loaded Human B7-1, Fc Tag (Cat. No. B71-H5259) on Protein A Biosensor, can bind Human CTLA-4, His Tag (Cat. No. CT4-H52H9) with an affinity constant of 0.498 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
Loaded Human B7-2, Fc Tag (Cat. No. CD6-H5257) on Protein A Biosensor, can bind Human CTLA-4, His Tag (Cat. No. CT4-H52H9) with an affinity constant of 1.03 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
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