膜杰作
Star Staining
分子别名（Synonym）
CD4,CD4mut,LEU3
表达区间及表达系统（Source）
FITC-Labeled Human CD4, Fc Tag (CD4-HF255) is expressed from human 293 cells (HEK293). It contains AA Lys 26 - Pro 396 (Accession # P01730). It is the FITC labeled form of Human CD4, Fc Tag (CD4-H5259).
Predicted N-terminus: Lys 26
Request for sequence
蛋白结构（Molecular Characterization）
This protein carries a human IgG1 Fc tag at the C-terminus.
The protein has a calculated MW of 67.7 kDa. The protein migrates as 67-80 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
偶联（Conjugate）
FITC
Excitation source: 488 nm spectral line, argon-ion laser
Excitation Wavelength: 488 nm
Emission Wavelength: 535 nm
标记（Labeling）
The primary amines in the side chains of lysine residues and the N-terminus of the protein are conjugated with FITC using standard chemical labeling method. The residual FITC is removed by molecular sieve treatment during purification process.
蛋白标记度（Protein Ratio）
The FITC to protein molar ratio is 3-5.
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
>95% as determined by SDS-PAGE.
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 protect from light and 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）
FITC-Labeled Human CD4, Fc Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 95%.
活性（Bioactivity）-ELISA
Immobilized Ibalizumab (Human IgG4) at 1 μg/mL (100 μL/well) can bind FITC-Labeled Human CD4, Fc Tag (Cat. No. CD4-HF255) with a linear range of 20-313 ng/mL (QC tested).
Protocol
Immobilized HIV-1 [HIV-1/Clade C (16055)] GP120, His Tag (Cat. No. GP5-V15224) at 10 μg/mL (100 μL/well) can bind FITC-Labeled Human CD4, Fc Tag (Cat. No. CD4-HF255) with a linear range of 0.039-0.313 μg/mL (Routinely tested).
Protocol
活性（Bioactivity）-FACS
2e5 of CD4-CAR-293 cells transfected with anti-CD4-scFv were stained with 100 μL of 1 μg/mL of FITC-Labeled Human CD4 Protein, Fc Tag (Cat. No. CD4-HF255) and negative control protein respectively. FITC signal was used to evaluate the binding activity (QC tested).
Protocol
背景（Background）
T-cell surface glycoprotein CD4 is also known as T-cell surface antigen T4/Leu-3. CD4 contains three Ig-like C2-type (immunoglobulin-like) domains and one Ig-like V-type (immunoglobulin-like) domain. CD4 is accessory protein for MHC class-II antigen/T-cell receptor interaction. CD4 induces the aggregation of lipid rafts. CD4 is a primary receptor used by HIV-1 to gain entry into host T cells. HIV infection leads to a progressive reduction of the number of T cells possessing CD4 receptors. Therefore, medical professionals refer to the CD4 count to decide when to begin treatment for HIV-infected patients.
