Siglec-2/CD22 Antibody (219903) [Unconjugated]

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.

• Reactivity: Hu
• Applications: B/N
• Clone: 219903
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: Unconjugated

Siglec-2/CD22 Antibody (219903) [Unconjugated] Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human Siglec-2/CD22
  Asp20-Arg687
  Accession # P20273
• Specificity: Detects human Siglec-2/CD22 in direct ELISAs.
• Source: N/A
• Isotype: IgG2b
• Clonality: Monoclonal
• Host: Mouse
• Purity Statement: Protein A or G purified from hybridoma culture supernatant
• Endotoxin Note: <0.10 EU per 1 μg of the antibody by the LAL method.

Applications/Dilutions

• Dilutions:
  • Neutralization 6-60 ng/mL

Packaging, Storage & Formulations

• 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.
• Buffer: 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.
• Reconstitution Instructions: Reconstitute at 0.5 mg/mL in sterile PBS.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for Siglec-2/CD22 Antibody (219903) [Unconjugated]

• 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

Background

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.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

FAQs for Siglec-2/CD22 Antibody (MAB19682). (Showing 1 - 1 of 1 FAQ).

1. I am interested in buying a CD22 antibody for fluorescence microscopy and FACS I red on your web page that you also offer to label your antibodies, if required, is that correct?
   • We do have the ability to perform custom conjugations on certain antibodies, including some to the CD22 protein. If you send me the conjugate you are interested in I can provide you with a quote.

Bioinformatics

• Uniprot:
  • P20273()