Human Siglec-2/CD22 Antibody

Catalog # Availability Size / Price Qty
Cell Adhesion Mediated by Siglec-2/CD22 and Neutral­ization by Human Siglec-2/CD22 Antibody.
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Product Details
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Human Siglec-2/CD22 Antibody Summary

Species Reactivity
Detects human Siglec-2/CD22 in direct ELISAs.
Monoclonal Mouse IgG2B Clone # 219903
Protein A or G purified from hybridoma culture supernatant
Mouse myeloma cell line NS0-derived recombinant human Siglec-2/CD22
Accession # P20273
Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.


Recommended Concentration
Measured by its ability to neutralize Siglec‑2/CD22-mediated adhesion of human red blood cells. Kelm, S. et al. (1994) Current Biology 4:965. The Neutralization Dose (ND50) is typically 6-60 ng/mL in the presence of 0.2 µg/mL Recombinant Human Siglec‑2/CD22 Fc Chimera.

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Data Example

Neutralization Cell Adhesion Mediated by Siglec-2/CD22 and Neutral­ization by Human Siglec-2/CD22 Antibody. View Larger

Cell Adhesion Mediated by Siglec-2/CD22 and Neutral­ization by Human Siglec-2/CD22 Antibody. Recombinant Human Siglec-2/CD22 Fc Chimera (Catalog # 1968-SL), immobilized onto a microplate, supports the adhesion of human red blood cells in a dose-dependent manner (orange line) as measured by the psuedoperoxidase assay. Adhesion elicited by Recombinant Human Siglec-2/CD22 Fc Chimera (0.2 µg/mL) is neutralized (green line) by increasing concentrations of Mouse Anti-Human Siglec-2/CD22 Monoclonal Antibody (Catalog # MAB19682). The ND50 is typically 6-60 ng/mL.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Preparation and Storage

Reconstitute at 0.5 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
Stability & Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Siglec-2/CD22

Siglecs (Sialic acid binding Ig-like Lectins) are I-type (Ig-type) lectins belonging to the Ig superfamily. They are characterized by an N-terminal V-type Ig-like domain which mediates sialic acid binding, followed by varying numbers of C2-type Ig-like domains (1, 2). Fourteen human Siglecs have been cloned and characterized. They are Sialoadhesin/CD169/Siglec-1, CD22/Siglec-2, CD33/Siglec-3, Myelin-Associated Glycoprotein (MAG/Siglec-4a), and the identified Siglecs 5 to 11, plus 14 to 16 (1-3). To date, no Siglec has been shown to recognize any cell surface ligand other than sialic acid, suggesting that interactions with glycans containing this carbohydrate are important in mediating the biological functions of Siglecs. Human Siglec-2, also known as B-cell antigen CD22 or B lymphocyte cell adhesion molecule (BL-CAM), is a B cell restricted glycoprotein that is expressed in the cytoplasm of progenitor B and pre-B cells and on the surface of mature B cells and intestinal eosinophils (3,4). Two distinct human Siglec-2/CD22 cDNAs that arise from differential RNA processing of the same gene have been isolated. The predominant Siglec-2/CD22 beta encodes an 847 amino acid (aa) polypeptide with a hydrophobic signal peptide, an V-type N-terminal Ig-like domain, six C2-type Ig-like domains, a transmembrane region and a cytoplasmic tail with 4 immunoreceptor tyrosine-based inhibition motifs (ITIMs) (5). The variant Siglec-2/CD22 alpha encodes a 647 aa polypeptide missing two C2-type Ig-like domains and has a truncated (23 aa) cytoplasmic tail (6). Siglec-2/CD22 is an adhesion molecule that preferentially binds alpha 2,6- linked sialic acid on the same (cis) or adjacent (trans) cells. Besides its role as an adhesion molecule, Siglec-2/CD22 is a coreceptor that physically interacts with B cell receptor (BCR) and is rapidly phosphorylated upon BCR ligation (3). It negatively regulates BCR signals by recruiting tyrosine phosphatase SHP-1 to its ITIMs, likely within large oligomeric complexes. Over aa 20-687, human and mouse share 59% aa sequence identity.

  1. Magesh, S. et al. (2011) Curr. Med. Chem. 18:3537.
  2. Bocher, B.S.. and N. Zimmermann (2015) J. Allergy Clin. Immunol. 135:598.
  3. Nitschke, L. (2014) Glycobiology 24:807.
  4. Wen, T. et al. (2012) J. Immunol. 188:1075.
  5. Wilson, G.L et al. (1991) J. Exp. Med. 173:137.
  6. Stamenkovic, I. and B. Seed (1990) Nature 345:74.
Long Name
Sialic Acid Binding Ig-like Lectin 2
Entrez Gene IDs
933 (Human); 12483 (Mouse); 308501 (Rat); 102130968 (Cynomolgus Monkey)
Alternate Names
B-cell receptor CD22; BL-CAM; B-lymphocyte cell adhesion molecule; CD22 antigenMGC130020; CD22 molecule; CD22; sialic acid binding Ig-like lectin 2; Sialic acid-binding Ig-like lectin 2; Siglec2; Siglec-2; SIGLEC2FLJ22814; T-cell surface antigen Leu-14

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Isotype Controls

Reconstitution Buffers

Secondary Antibodies

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