Human Siglec-2/CD22 Antibody
R&D Systems, part of Bio-Techne | Catalog # MAB1968
Key Product Details
Species Reactivity
Applications
Label
Antibody Source
Product Specifications
Immunogen
Asp20-Arg687
Accession # CAA42006
Specificity
Clonality
Host
Isotype
Scientific Data Images for Human Siglec-2/CD22 Antibody
Detection of Siglec-2/CD22 in Human PBMCs by Flow Cytometry.
Human peripheral blood mononuclear cells (PBMCs) were stained with Mouse Anti-Human CD19 APC-conjugated Monoclonal Antibody (Catalog # FAB4867A) and either (A) Mouse Anti-Human Siglec-2/CD22 Monoclonal Antibody (Catalog # MAB1968) or (B) Mouse IgG1Isotype Control (Catalog # MAB002) followed by Phycoerythrin-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # F0102B). View our protocol for Staining Membrane-associated Proteins.Applications for Human Siglec-2/CD22 Antibody
CyTOF-ready
Flow Cytometry
Sample: Human peripheral blood mononuclear cells (PBMCs)
Formulation, Preparation, and Storage
Purification
Reconstitution
Formulation
*Small pack size (-SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
Shipping
Stability & Storage
- 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 alpha2,6- 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.
References
- Magesh, S. et al. (2011) Curr. Med. Chem. 18:3537.
- Bocher, B.S.. and N. Zimmermann (2015) J. Allergy Clin. Immunol. 135:598.
- Nitschke, L. (2014) Glycobiology 24:807.
- Wen, T. et al. (2012) J. Immunol. 188:1075.
- Wilson, G.L et al. (1991) J. Exp. Med. 173:137.
- Stamenkovic, I. and B. Seed (1990) Nature 345:74.
Long Name
Alternate Names
Gene Symbol
UniProt
Additional Siglec-2/CD22 Products
Product Documents for Human Siglec-2/CD22 Antibody
Product Specific Notices for Human Siglec-2/CD22 Antibody
For research use only