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Your Position: 홈 > Protein > Siglec-2 > CD2-HF254

FITC-Labeled Human Siglec-2 / CD22 Protein, Fc Tag

INTRODUCTION
QC & Assay Protocol
Citation & Background
  • Synonym
    CD22,SIGLEC2,BL-CAM,SIGLEC-2,Siglec2,SIGLEC2FLJ22814
  • Source
    FITC-Labeled Human Siglec-2, Fc Tag (CD2-HF254) is expressed from human 293 cells (HEK293). It contains AA Asp 20 - Arg 687 (Accession # P20273-1). It is the FITC labeled form of Human Siglec-2, Fc Tag (Cat. No. CD2-H5253).
    Predicted N-terminus: Asp 20
    Request for sequence
  • Molecular Characterization
    Siglec-2 Structure

    This protein carries a human IgG1 Fc tag at the C-terminus

    The protein has a calculated MW of 101.6 kDa. The protein migrates as 130-150 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.

  • Conjugate

    FITC

    Excitation source: 488 nm spectral line, argon-ion laser

    Excitation Wavelength: 488 nm

    Emission Wavelength: 535 nm

  • 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.
  • Protein Ratio
    The FITC to protein molar ratio is 3.5-5.5.
  • Endotoxin
    Less than 1.0 EU per μg by the LAL method.
  • Purity

    >95% as determined by SDS-PAGE.

  • Formulation

    Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 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 12 months in lyophilized state;
    2. -70°C for 3 months under sterile conditions after reconstitution.
SDS-PAGE
Siglec-2 SDS-PAGE

FITC-Labeled Human Siglec-2, 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%.

Bioactivity-ELISA
Siglec-2 ELISA

Immobilized Monoclonal Anti-Human Siglec-2 Antibody, Human IgG1 at 1 μg/mL (100 μL/well) can bind FITC-Labeled Human Siglec-2, Fc Tag (Cat. No. CD2-HF254) with a linear range of 0.1-2.5 μg/mL (QC tested).

Protocol
Bioactivity-FACS
Siglec-2 FACS

2e5 of Anti-CD22 CAR-293 cells were stained with 100 μL of 10 μg/mL of FITC-Labeled Human Siglec-2, Fc Tag (Cat. No.CD2-HF254) and negative control protein respectively, FITC signal was used to evaluate the binding activity (Routinely tested).

Protocol
  • Background
    B-cell receptor CD22 is also known as Sialic acid-binding Ig-like lectin 2 (Siglec-2), B-lymphocyte cell adhesion molecule (BL-CAM), T-cell surface antigen Leu-14, which belongs to the immunoglobulin superfamily and SIGLEC (sialic acid binding Ig-like lectin) family. CD22 mediates B-cell B-cell interactions, and may be involved in the localization of B-cells in lymphoid tissues. Siglec-2 / CD22 binds sialylated glycoproteins, one of which is CD45. Siglec2 / CD22 plays a role in positive regulation through interaction with Src family tyrosine kinases and may also act as an inhibitory receptor by recruiting cytoplasmic phosphatases via their SH2 domains that block signal transduction through dephosphorylation of signaling molecules.
  • Clinical and Translational Updates

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