Rabbit Anti-CD45 (B220, CD 45, CD45 Antigen, CD45R, GP180, L CA, L-CA, LCA, Leukocyte Common Antigen, Loc, Ly-5, LY5, Ly5, Homolog of, Lyt-4, Protein Tyrosine Phosphatase Receptor Type C, Protein Tyrosine Phosphatase Receptor Type C Polypeptide, Protein Tyrosine Phosphatase, Receptor Type C, PTPRC, Receptor-type Tyrosine-protein Phosphatase C, SCID Due to PTPRC Deficiency, T200, T200 Glycoprotein, T200 Leukocyte Common Antigen)
CD45 (Cluster of Differentiation 45), also known as PTPRC, LCA or CD45R, is an enzyme that, in humans, is encoded by the PTPRC gene. CD45 is a member of the protein tyrosine phosphatase (PTP) family. CD45 is a major high molecular mass leukocyte cell surface molecule which is also an integral membrane protein tyrosine phosphatase. The cytogenetic location of CD45 is 1q31.3-q32.1. This gene is especially a prototype for transmembrane protein-tyrosine phosphatase (PTP). Targeted disruption of the CD45 gene leads to enhanced cytokine and interferon receptor-mediated activation of JAKs and STAT proteins. In vitro, CD45 directly dephosphorylates and binds to JAKs. Functionally, CD45 negatively regulates interleukin-3-mediated cellular proliferation, erythropoietin-dependent hematopoiesis, and antiviral responses in vitro and in vivo. CD45 has been best studied in T cells, where it determines T cell receptor signaling thresholds. CD45 is moved into or out of the immunological synapse (IS) membrane microdomain depending on the relative influence of interaction with the extracellular galectin lattice or the intracellular actin cytoskeleton. Galectin interaction can be finetuned by varying usage of the heavily O glycosylated spliced regions and sialylation of N linked carbohydrates.
Applications
Suitable for use in Western Blot and Immunohistochemistry. Other applications not tested.
Recommended Dilution
Western Blot: 0.1-0.5ug/ml, the detection limit is ~0.25ng/lane under reducing conditions. Immunohistochemistry (paraffin): 0.5-1ug/ml, boiling the paraffin sections in 10mM citrate buffer, pH 6.0, for 20 mins is required for the staining of formalin/paraffin sections. Optimal dilutions to be determined by the researcher.
Storage and Stability
Lyophilized and reconstituted products are stable for 12 months after receipt at -20°C. Reconstitute with sterile ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
Immunogen
Recombinant protein corresponding to human CD45 expressed in E. coli. (Position: R1113-S1304). Species sequence homology: mouse and rat (68%)
Form
Supplied as a lyophilized powder from PBS, 5% BSA, 0.05% sodium azide. Reconstitute with 200ul sterile dH2O.
Purity
Purified by immunoaffinity chromatography.
Specificity
Recognizes human CD45.
