Anti-B-celreceptor CD22 CD22 Antibody Picoband® fluoro550 Vervoeging

CD22 is a surface glycoprotein of B lymphocytes that is rapidly phosphorylated on cytoplasmic tyrosines after antigen receptor cross-linking. CD22 is a negative regulator of antigen receptor signaling whose onset of expression at the mature B cell stage may serve to raise the antigen concentration threshold required for B cell triggering. The human CD22 gene is expressed specifically in B lymphocytes and likely has an important function in cell-cell interactions. The B cell coreceptor CD22 plays an important role in regulating signal transduction via the B cell Ag receptor.3 CD22 is located within the band region q13.1 of chromosome 19.

B-cell receptor CD22; B-lymphocyte cell adhesion molecule; BL-CAM; Sialic acid-binding Ig-like lectin 2; Siglec-2; T-cell surface antigen Leu-14; CD22; CD22; SIGLEC2

CD22

933

P20273

Human

No cross-reactivity with other proteins

A synthetic peptide corresponding to a sequence at the C-terminus of human CD22.

B-lymphocytes.

Flow Cytometry

Adaptive Immunity, B Cells, Cancer, Hematopoietic Progenitors, Immunology, Lymphoid, Stem Cells, Tumor Antigens, Tumor Biomarkers, Tumor Immunology, Tumor-Associated Antigens

Immunogen affinity purified.

Liquid

Mediates B-cell B-cell interactions. May be involved in the localization of B-cells in lymphoid tissues. Binds sialylated glycoproteins; one of which is CD45. Preferentially binds to alpha-2,6-linked sialic acid. The sialic acid recognition site can be masked by cis interactions with sialic acids on the same cell surface. Upon ligand induced tyrosine phosphorylation in the immune response seems to be involved in regulation of B-cell antigen receptor signaling. Plays a role in positive regulation through interaction with Src family tyrosine kinases and may also act as an inhibitory receptor by recruiting cytoplasmic phosphatases via their SH2 domains that block signal transduction through dephosphorylation of signaling molecules.

1. O'Keefe, T. L.; Williams, G. T.; Davies, S. L.; Neuberger, M. S. Hyperresponsive B cells in CD22-deficient mice. Science 274: 798-801, 1996. 2. Wilson, G. L.; Najfeld, V.; Kozlow, E.; Menniger, J.; Ward, D.; Kehrl, J. H. Genomic structure and chromosomal mapping of the human CD22 gene. J. Immun. 150: 5013-5024, 1993. 3. John, B.; Herrin, B. R.; Raman, C.; Wang, Y.; Bobbitt, K. R.; Brody, B. A.; Justement, L. B. The B cell coreceptor CD22 associates with AP50, a clathrin-coated pit adapter protein, via tyrosine-dependent interaction. J. Immun. 170: 3534-3543, 2003.

At -20 ̊C for one year from date of receipt. Avoid repeated freezing and thawing. Protect from light.

95348 MW

No cross reactivity with other proteins.

6

B-cell receptor CD22

Cell membrane; Single-pass type I membrane protein.

Belongs to the immunoglobulin superfamily. SIGLEC (sialic acid binding Ig-like lectin) family.

B-cell receptor CD22

Rabbit IgG

Each vial contains 50% glycerol, 0.9% NaCl, 0.2% Na2HPO4, 0.02% NaN3.