Quick Order

Home>CD22
Text Size:AAA

CD22/Siglec-2  Protein, Antibody, ELISA Kit, cDNA Clone

Expression host: Human Cells  
11958-H02H-50
11958-H02H-200
50 µg 
200 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
11958-H08H-50
11958-H08H-100
50 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
11958-H08H1-50
11958-H08H1-100
50 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
51177-M02H-50
51177-M02H-100
50 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
51177-M08H-50
51177-M08H-100
50 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
81343-R02H-5
81343-R02H-20
81343-R02H-100
5 µg 
20 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
81343-R08H-5
81343-R08H-20
81343-R08H-100
5 µg 
20 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
90246-C08H-5
90246-C08H-20
90246-C08H-100
5 µg 
20 µg 
100 µg 
Add to Cart
  • Slide 1
Expression host: Human Cells  
90246-C02H-50
90246-C02H-20
50 µg 
20 µg 
Add to Cart
  • Slide 1

CD22/Siglec-2 Related Area

CD22/Siglec-2 Related Pathways

    CD22/Siglec-2 Related Protein, Antibody, cDNA Gene, and ELISA Kits

    CD22/Siglec-2 Related Protein, Antibody, cDNA Gene, and ELISA Kits

    Featured Reagent Products

    CD22/Siglec-2 Summary & Protein Information

    CD22/Siglec-2 Background

    Subunit structure: Predominantly monomer of isoform CD22-beta. Also found as heterodimer of isoform CD22-beta and a shorter isoform. Interacts with PTPN6/SHP-1, LYN, SYK, PIK3R1/PIK3R2 and PLCG1 upon phosphorylation. Interacts with GRB2, INPP5D and SHC1 upon phosphorylation (By similarity). May form a complex with INPP5D/SHIP, GRB2 and SHC1. {ECO:0000250, ECO:0000269|PubMed:7618087, ECO:0000269|PubMed:8627166, ECO:0000269|PubMed:8647200}.
    Domain: Contains 4 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.
    Subcellular location: Cell membrane; Single-pass type I membrane protein.
    Tissue specificity: B-lymphocytes.
    Post-translational: Phosphorylation of Tyr-762, Tyr-807 and Tyr-822 are involved in binding to SYK, GRB2 and SYK, respectively. Phosphorylation of Tyr-842 is involved in binding to SYK, PLCG2 and PIK3R1/PIK3R2.; Phosphorylated on tyrosine residues by LYN. {ECO:0000250}.
    Sequence similarity: Belongs to the immunoglobulin superfamily. SIGLEC (sialic acid binding Ig-like lectin) family. {ECO:0000305}.; Contains 6 Ig-like C2-type (immunoglobulin-like) domains. {ECO:0000305}.; Contains 1 Ig-like V-type (immunoglobulin-like) domain. {ECO:0000305}.
    General information above from UniProt

    CD22 is a member of the immunoglobulin superfamily, SIGLEC family of lectins. It is first expressed in the cytoplasm of pro-B and pre-B cells, and on the surface as B cells mature to become IgD+. CD22 serves as an adhesion receptor for sialic acid-bearing ligands expressed on erythrocytes and all leukocyte classes. In addition to its potential role as a mediator of intercellular interactions, signal transduction through CD22 can activate B cells and modulate antigen receptor signaling in vitro. The phenotype of CD22-deficient mice suggests that CD22 is primarily involved in the generation of mature B cells within the bone marrow, blood, and marginal zones of lymphoid tissues. CD22 recruits the tyrosine phosphatase Src homology 2 domain-containing phosphatase 1 (SHP-1) to immunoreceptor tyrosine-based inhibitory motifs (ITIMs) and inhibits B-cell receptor (BCR)-induced Ca2+ signaling on normal B cells. CD22 interacts specifically with ligands carrying alpha2-6-linked sialic acids. As an inhibitory coreceptor of the B-cell receptor (BCR), CD22 plays a critical role in establishing signalling thresholds for B-cell activation. Like other coreceptors, the ability of CD22 to modulate B-cell signalling is critically dependent upon its proximity to the BCR, and this in turn is governed by the binding of its extracellular domain to alpha2,6-linked sialic acid ligands. However, genetic studies in mice reveal that some CD22 functions are regulated by ligand binding, whereas other functions are ligand-independent and may only require expression of an intact CD22 cytoplasmic domain at the B-cell surface. CD19 regulates CD22 phosphorylation by augmenting Lyn kinase activity, while CD22 inhibits CD19 phosphorylation via SHP-1.

    CD22/Siglec-2 Alternative Name

    SIGLEC2,SIGLEC-2, [homo-sapiens]
    SIGLEC2,CD22,FLJ22814,MGC130020,SIGLEC-2, [human]
    Lyb-8,A530093D23,Cd22,Lyb8, [mouse]
    Lyb8,Lyb-8,A530093D23, [mus-musculus]

    CD22/Siglec-2 Related Studies

  • Tedder TF, et al. (1997) CD22, a B lymphocyte-specific adhesion molecule that regulates antigen receptor signaling. Annu Rev Immunol. 15: 481-504.
  • Tedder TF, et al. (2005) CD22: a multifunctional receptor that regulates B lymphocyte survival and signal transduction. Adv Immunol. 88: 1-50.
  • Fujimoto M, et al. (2007) B cell signaling and autoimmune diseases: CD19/CD22 loop as a B cell signaling device to regulate the balance of autoimmunity. J Dermatol Sci. 46(1): 1-9.
  • Walker JA, et al. (2008) CD22: an inhibitory enigma. Immunology. 123(3): 314-25.
  • Nitschke L. (2009) CD22 and Siglec-G: B-cell inhibitory receptors with distinct functions. Immunol Rev. 230(1): 128-43.
  • Please note: All products are "FOR RESEARCH USE ONLY AND ARE NOT INTENDED FOR DIAGNOSTIC OR THERAPEUTIC USE"