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Siglec-2/CD22
- SPECIFICATION
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- BACKGROUND
| Primary Accession | P20273 |
|---|---|
| Species | Human |
| Sequence | Asp20-Arg687 |
| Purity | > 95% as analyzed by SDS-PAGE > 95% as analyzed by HPLC |
| Endotoxin Level | ≤ 1 EU/ µg of protein by LAL method |
| Biological Activity | Immobilized Human Siglec2 at 0.5 µg/ml (100 µl/Well). Dose response curve for Biotinylated Anti-Siglec2 Ab with the EC50 of 0.2 µg/ml determined by ELISA. |
| Expression System | Expi293 |
| Formulation | Lyophilized from a 0.22 µm filtered solution in PBS, pH 7.4. Normally 5 % trehalose is added as protectant before lyophilization. |
| Reconstitution | It is recommended that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute the lyophilized powder in distilled water up to 100 µg/ml. |
| Storage & Stability | Upon receiving, this product remains stable for up to 6 months at -70°C or -20°C. Avoid repeated freeze-thaw cycles. |
| Gene ID | 933 |
|---|---|
| Other Names | 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 {ECO:0000303|PubMed:1691828, ECO:0000312|HGNC:HGNC:1643} |
| Target Background | CD22, or cluster of differentiation-22, is a molecule belonging to the SIGLEC family of lectins. It is found on the surface of mature B cells and to a lesser extent on some immature B cells. CD22 a member of the immunoglobulin superfamily. CD22 functions as an inhibitory receptor for B cell receptor (BCR) signaling. It is also involved in the B cell trafficking to Peyer's patches in mice. |
| Name | CD22 {ECO:0000303|PubMed:1691828, ECO:0000312|HGNC:HGNC:1643} |
|---|---|
| Function | Most highly expressed siglec (sialic acid-binding immunoglobulin-like lectin) on B-cells that plays a role in various aspects of B-cell biology including differentiation, antigen presentation, and trafficking to bone marrow (PubMed:34330755, PubMed:8627166). Binds to alpha 2,6-linked sialic acid residues of surface molecules such as CD22 itself, CD45 and IgM in a cis configuration. Can also bind to ligands on other cells as an adhesion molecule in a trans configuration (PubMed:20172905). Acts as an inhibitory coreceptor on the surface of B-cells and inhibits B-cell receptor induced signaling, characterized by inhibition of the calcium mobilization and cellular activation. Mechanistically, the immunoreceptor tyrosine-based inhibitory motif domain is phosphorylated by the Src kinase LYN, which in turn leads to the recruitment of the protein tyrosine phosphatase 1/PTPN6, leading to the negative regulation of BCR signaling (PubMed:8627166). If this negative signaling from is of sufficient strength, apoptosis of the B-cell can be induced (PubMed:20516366). |
| Cellular Location | Cell membrane; Single-pass type I membrane protein |
| Tissue Location | B-lymphocytes. |
Research Areas
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Cat# PVGS1630
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