Human Siglec-2/CD22 Antibody

Catalog #: MAB19681
1 Citation Datasheet / COA / SDS

Catalog #	Availability	Size / Price	Qty
MAB19681
MAB19681-SP

Detection of Human Siglec‑2/CD22 by Western Blot.

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Summary Data Examples Preparation and Storage Reconstitution Calculator Background Product Datasheets Related Research Areas

Human Siglec-2/CD22 Antibody Summary

Species Reactivity

Human

Specificity

Detects human Siglec-2/CD22 in direct ELISAs and Western blots. In Western blots, approximately 25% cross-reactivity with recombinant human (rh) Siglec-7 and rhSiglec-9 is observed, and no cross-reactivity with rhSiglec-3 is observed.

Source

Monoclonal Mouse IgG₁ Clone # 219902

Purification

Protein A or G purified from hybridoma culture supernatant

Immunogen

Mouse myeloma cell line NS0-derived recombinant human Siglec-2/CD22
Asp20-Arg687
Accession # CAA42006

Formulation

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.

Applications

Recommended Concentration

Sample

Western Blot

0.2 µg/mL

See below

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.

Scientific Data

Western Blot

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Detection of Human Siglec‑2/CD22 by Western Blot. Western blot shows lysates of Daudi human Burkitt's lymphoma cell line. PVDF membrane was probed with 0.2 µg/mL of Mouse Anti-Human Siglec-2/CD22 Monoclonal Antibody (Catalog # MAB19681) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF018). A specific band was detected for Siglec-2/CD22 at approximately 140 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

Reconstitution Calculator

Preparation and Storage

Reconstitution

Sterile PBS to a final concentration of 0.5 mg/mL.

Shipping

Lyophilized product is shipped at ambient temperature. Liquid small pack size (-SP) is shipped with polar packs. Upon receipt, store immediately at the temperature recommended below.

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 Ig-like V-type domain which mediates sialic acid binding, followed by varying numbers of Ig-like C2-type domains (1, 2). Eleven 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 (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. 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 N-terminal Ig-like V-type domain, six Ig-like C2-type domains, a transmembrane region and a cytoplasmic tail with 4 immunoreceptor tyrosine-based inhibition motifs (ITIMs) (4). The variant Siglec-2/CD22 alpha encodes a 647 aa polypeptide missing two Ig-like C2-type domains and has a truncated (23 aa) cytoplasmic tail (5). Siglec-2/CD22 is an adhesion molecule that preferentially binds alpha 2,6- linked sialic acid on the same (cis) or adjacent (trans) cells. Interaction of CD22 with trans ligands on opposing cells was found to be favored over the binding of ligands in cis (9). 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. It negatively regulates BCR signals by recruiting tyrosine phosphatase SHP-1 to its ITIMs. Phosphorylated Siglec-2/CD22 can also interact with other intracellular effector proteins such as Syk, PLC gamma, PI3 kinase, and Grb-2, suggesting it may play a role in positive signaling (2, 7, 8).

References

Crocker, P.R. and A. Varki (2001) Trends Immunol. 22:337.
Crocker, P.R. and A. Varki (2001) Immunology 103:137.
Angata, T. et al. (2002) J. Biol. Chem. 277:24466.
Wilson, G.L et al. (1991) J. Exp. Med. 173:137.
Stamenkovic, I. and B. Seed (1990) Nature 345:74.
Kelm, S. et al. (1994) Current Bio. 4:965.
Ravetch, J.V. and L.L. Lanier (2000) Science 290:84.
Wienands, Y.J. et al. (1999) J. Biol. Chem. 274:18769.
Collins, B.E. et al. (2004) Proc. Natl. Acad. Sci. USA 101:6104.

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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Citation for Human Siglec-2/CD22 Antibody

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