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Your Position: Home > Antibody > G4S linker > G4S-AFYP1

Alexa Fluor 488-Labeled Monoclonal Anti-G4S linker Antibody, Rabbit IgG (016) (0.03% Proclin)

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  • 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. It shows superior performance in flow cytometry assays with higher affinity and better specificity.
  • Application
    Flow Cytometry (Evaluation of cell surface expressed CARs of varying specificity containing a G4S linker within the scFv of the extracellular domain).
  • Clone
    016
  • Species
    Rabbit
  • Isotype
    Rabbit IgG | Rabbit Kappa
  • Specificity
    It can specifically recognize proteins or ScFv containing (G3S)n or (G4S)n linkers, where n = 2, 3, 4... That is, it can recognize linkers with a minimum length of 2 repeats for both (G3S)n and (G4S)n.
  • Conjugate

    AF488

    Excitation Wavelength: 488 nm

    Emission Wavelength: 517 nm

  • Recommended Dilution
    1:50
  • Formulation

    Lyophilized from 0.22 μm filtered solution in PBS, pH7.4, 0.03% Proclin300 with trehalose as protectant.

    Contact us for customized product form or formulation.

  • 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.

  • 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:

    1. -20°C to -70°C for 24 months in lyophilized state;
    2. -70°C for 12 months after reconstitution.
    3. 2-8 °C for 12 months after reconstitution.
Bioactivity-FACS
 G4S linker FACS

Flow cytometric analysis of Anti-MSLN CAR-293 cells staining with Alexa Fluor 488-Labeled Monoclonal Anti-G4S linker Antibody, Rabbit IgG (016) (Cat. No. G4S-AFYP1) 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 488 signal was used to evaluate the binding activity (QC tested).​

 G4S linker FACS

Non-specificity of Alexa Fluor 488-Labeled Monoclonal Anti-G4S linker Antibody, Rabbit IgG (016) (Cat. No. G4S-AFYP1) binding to CD3+ cells present in human PBMC. 5e5 of human PBMCs were simultaneously stained with PE anti-CD3 antibody and Alexa Fluor 488-Labeled Monoclonal Anti-G4S linker Antibody, Rabbit IgG (016) (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 PE and Alexa Fluor 488 positive signals was used to evaluate the non-specific binding activity to human CD3+ cells (QC tested).​

  • Background
    The poly-Glycine-Serine (G4S) linker is a type of flexible, unstructured synthetic peptide linker sequence often leveraged to connect the variable heavy (VH) domain and variable light (VL) domain of single-chain variable fragments (scFvs) and chimeric antigen receptors (CARs) that utilize an extracellular domain scFv for target antigen recognition. The linker itself consists of a core pentapeptide sequence, Gly-Gly-Gly-Gly-Ser, that is repeated and commonly found as either a 15-mer (G4S)3 or20-mer(G4S) 4 within scFv-based CARs and scFv fragments. The linker sequence length plays a role in controlling scFv stability and the noncovalent association between the VH and VL domains.
  • Clinical and Translational Updates

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