Bioactive grade

Recombinant human CD33 protein (Fc Chimera Active) (ab174052)


  • Product name

    Recombinant human CD33 protein (Fc Chimera Active)
    See all CD33 proteins and peptides
  • Biological activity

    Measured by the ability of the immobilized protein to support the adhesion of Human red blood cells.

    The ED50 for this effect is typically 1.2-4.8 µg/ml.

  • Purity

    > 95 % SDS-PAGE.

  • Endotoxin level

    < 1.000 Eu/µg
  • Expression system

    HEK 293 cells
  • Accession

  • Protein length

    Protein fragment
  • Animal free

  • Nature

    • Species

    • Sequence

    • Predicted molecular weight

      53 kDa including tags
    • Amino acids

      18 to 259
    • Additional sequence information

      Recombinant Human CD33 Protein fragment (extracellular domain) fused with Fc fragment of Human IgG1 at the C-terminus.

Associated products


Our Abpromise guarantee covers the use of ab174052 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

  • Applications

    Functional Studies


  • Form

  • Additional notes

    After reconstitution store under sterile conditions for 1 month at 4°C - 8°C or 3 months at -20°C to -80°C. Avoid repeated freeze-thaw cycles.

  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Store at 4°C prior to reconstitution. Store at -20°C or -80°C. Please see notes section.

    pH: 7.5
    Constituents: 10% Trehalose, 0.61% Tris, 0.75% Glycine, Sodium chloride, L-Arginine

    This product is an active protein and may elicit a biological response in vivo, handle with caution.

General Info

  • Alternative names

    • CD 33
    • CD33
    • CD33 antigen
    • CD33 antigen (gp67)
    • CD33 molecule
    • CD33_HUMAN
    • FLJ00391
    • gp67
    • My9
    • Myeloid cell surface antigen CD33
    • Myeloid cell surface antigen CD33 precursor
    • Myeloid differentiation antigen CD33
    • p67
    • Sialic acid binding Ig like lectin 3
    • Sialic acid binding immunoglobulin like lectin 3
    • Sialic acid-binding Ig-like lectin 3
    • SIGLEC 3
    • Siglec-3
    • SIGLEC3
    see all
  • Function

    Putative adhesion molecule of myelomonocytic-derived cells that mediates sialic-acid dependent binding to cells. Preferentially binds to alpha-2,6-linked sialic acid. The sialic acid recognition site may be masked by cis interactions with sialic acids on the same cell surface. In the immune response, may act as an inhibitory receptor upon ligand induced tyrosine phosphorylation by recruiting cytoplasmic phosphatase(s) via their SH2 domain(s) that block signal transduction through dephosphorylation of signaling molecules. Induces apoptosis in acute myeloid leukemia (in vitro).
  • Tissue specificity

    Monocytic/myeloid lineage cells.
  • Sequence similarities

    Belongs to the immunoglobulin superfamily. SIGLEC (sialic acid binding Ig-like lectin) family.
    Contains 1 Ig-like C2-type (immunoglobulin-like) domain.
    Contains 1 Ig-like V-type (immunoglobulin-like) domain.
  • Domain

    Contains 2 copies of a cytoplasmic motif that is referred to as the immunoreceptor tyrosine-based inhibitor motif (ITIM). This motif is involved in modulation of cellular responses. The phosphorylated ITIM motif can bind the SH2 domain of several SH2-containing phosphatases.
  • Post-translational

    Phosphorylation of Tyr-340 is involved in binding to PTPN6 and PTPN11. Phosphorylation of Tyr-358 is involved in binding to PTPN6.
  • Cellular localization

    Cell membrane.
  • Information by UniProt


  • Human Siglec-3, Fc Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
  • Immobilized Human Siglec-3, Fc Tag at 1 µg/mL (100 µL/well) can bind Anti-Human Anti-CD33 Mab with a linear range of 0.156-2.5 µg/mL.
  • The purity of ab174052 was determined by reduced SDS-PAGE and staining overnight with Coomassie Blue.

    Lane 1: MW markers

    Lane 2: ab174052 (predicted MW of 53kDa)  DTT-reduced ab174052 migrates at 62-85 kDa due to glycosylation


ab174052 has not yet been referenced specifically in any publications.

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