膜杰作
Star Staining
抗体来源（Source）
Monoclonal Anti-G4S linker Antibody, Rabbit IgG (016) is a rabbit monoclonal antibody recombinantly expressed from human 293 cells (HEK293), which provides higher batch consistency and long term security of supply.
应用（Application）
Flow Cytometry (Evaluation of cell surface expressed CARs of varying specificity containing a G4S linker within the scFv of the extracellular domain).
克隆号（Clone）
016
种属（Species）
Rabbit
亚型（Isotype）
Rabbit IgG | Rabbit Kappa
特异性（Specificity）
Specifically recognizes the scFv-based CARs containing a G4S linker.
偶联（Conjugate）
AF647
Excitation Wavelength: 640 nm
Emission Wavelength: 672 nm
推荐稀释比（Recommended Dilution）
1:50
制剂（Formulation）
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4, 0.03% Proclin 300 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）
Please protect from light and avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- -20°C to -70°C for 24 months in lyophilized state;
- -70°C for 12 months after reconstitution.
活性（Bioactivity）-FACS
Flow cytometric analysis of Anti-MSLN CAR-293 cells staining with Alexa Fluor™ 647-Labeled Monoclonal Anti-G4S Linker Antibody, Rabbit IgG (016) (Cat. No. G4S-ABFYP1) at 1:50 dilution (2 μL of the antibody stock solution corresponds to labeling of 1e6 cells in a final volume of 100 µL), compared with isotype control antibody. Alexa Fluor 647 signal was used to evaluate the binding activity (QC tested).
Protocol
Non-specificity of Alexa Fluor™ 647-Labeled Monoclonal Anti-G4S Linker Antibody, Rabbit IgG (016) (Cat. No. G4S-ABFYP1) binding to CD3+ cells present in human PBMC. 5e5 of human PBMCs were simultaneously stained with FITC-labeled anti-CD3 antibody and Alexa Fluor™ 647-Labeled Monoclonal Anti-G4S Linker Antibody (2 μL of the antibody stock solution corresponds to labeling of 5e5 cells in a final volume of 100 µL) and washed and then analyzed with FACS. Both FITC and Alexa Fluor 647 positive signals was used to evaluate the non-specific binding activity to human CD3+ cells (QC tested).
Protocol
Flow cytometric analysis of Anti-CD22 CAR-293 cells staining with Alexa Fluor™ 647-Labeled Monoclonal Anti-G4S Linker Antibody, Rabbit IgG (016) (Cat. No. G4S-ABFYP1) at 1:50 dilution (2 μL of the antibody stock solution corresponds to labeling of 1e6 cells in a final volume of 100 µL), compared with isotype control antibody. Alexa Fluor 647 signal was used to evaluate the binding activity (Routinely tested).
Protocol
Flow cytometric analysis of Anti-CD19 CAR-293 cells staining with Alexa Fluor™ 647-Labeled Monoclonal Anti-G4S Linker Antibody, Rabbit IgG (016) (Cat. No. G4S-ABFYP1) at 1:50 dilution (2 μL of the antibody stock solution corresponds to labeling of 1e6 cells in a final volume of 100 µL), compared with isotype control antibody. Alexa Fluor 647 signal was used to evaluate the binding activity (Routinely tested).
Protocol
背景（Background）
The G4S linker is emerged as the most common linking peptides for scFvs. It is composed of the repeated sequence (Gly-Gly-Gly-Gly-Ser) and commonly found as either a 15-mer (G4S)3 or 20-mer(G4S)4 within scFv fragments. The G4S linker has become an integral part of the vast majority of CARs as it links the VH and VL recognition domains of scFvs. The G4S linker is commonly used in CARs targeting solid tumor antigens, such as HER2 and CEA, while the whitlow/218 linker peptide is predominantly used in CAR constructs targeting hematological malignancies such as CD19 CAR products.
