Mouse CD19 Protein 3479

Additional Information:
accession P25918|express systemHEK293|product tagC-His|purity> 90% as determined by Tris-Bis PAGE|backgroundCD19 is a 95 kDa transmembrane glycoprotein that plays a central role in B cell activation and humoral immune responses.Functions as coreceptor for the B-cell antigen receptor complex (BCR) on B-lymphocytes. Decreases the threshold for activation of downstream signaling pathways and for triggering B-cell responses to antigens. Activates signaling pathways that lead to the activation of phosphatidylinositol 3-kinase and the mobilization of intracellular Ca2 stores.|molecular weightThe protein has a predicted MW of 30.7 kDa. Due to glycosylation, the protein migrates to 55-68 kDa based on Tris-Bis PAGE result.|available size100 g, 500 g|endotoxinLess than 1EU per ug by the LAL method.|Mouse CD19 Protein 3479proteinSize and concentration100, 500g and lyophilizedFormLyophilizedStorage InstructionsValid for 12 months from date of receipt when stored at -80C. Recommend to aliquot the protein into smaller quantities for optimal storage. Please minimize freeze-thaw cycles.Storage bufferShipped at ambient temperature.Purity> 95% as determined by Tris-Bis PAGEtarget relevanceCD19 is a 95 kDa transmembrane glycoprotein that plays a central role in B cell activation and humoral immune responses.Functions as coreceptor for the B-cell antigen receptor complex (BCR) on B-lymphocytes. Decreases the threshold for activation of downstream signaling pathways and for triggering B-cell responses to antigens. Activates signaling pathways that lead to the activation of phosphatidylinositol 3-kinase and the mobilization of intracellular Ca2 stores.Protein namesB-lymphocyte antigen CD19 (Differentiation antigen CD19) (CD antigen CD19)Gene namesCD19,CD19Mass10090DaFunctionFunctions as a coreceptor for the B-cell antigen receptor complex (BCR) on B-lymphocytes. Decreases the threshold for activation of downstream signaling pathways and for triggering B-cell responses to antigens (By similarity). Activates signaling pathways that lead to the activation of phosphatidylinositol 3-kinase and the mobilization of intracellular Ca(2+) stores (PubMed:12387743, PubMed:20101619, PubMed:9382888). Is not required for early steps during B cell differentiation in the blood marrow (PubMed:7542548, PubMed:7543183, PubMed:9317126). Required for normal differentiation of B-1 cells (PubMed:12387743, PubMed:7542548, PubMed:7543183). Required for normal B cell differentiation and proliferation in response to antigen challenges (PubMed:12387743, PubMed:7542548, PubMed:9317126). Required for normal levels of serum immunoglobulins, and for production of high-affinity antibodies in response to antigen challenge (PubMed:12387743, PubMed:7542548, PubMed:7543183).Subellular locationCell membrane ; Single-pass type I membrane protein. Membrane raft ; Single-pass type I membrane protein .TissuesDetected on B cells in spleen, bone marrow, thymus and lymph nodes (PubMed:12387743, PubMed:20101619, PubMed:7542548). Detected on peripheral blood lymphocytes (at protein level) (PubMed:7543183).StructureInteracts with CR2/CD21. Part of a complex composed of CD19, CR2/CD21, CD81 and IFITM1/CD225 in the membrane of mature B-cells. Interacts directly with CD81 (via the second extracellular domain); this interaction is initiated early during biosynthesis in the ER/pre-Golgi compartments and is essential for trafficking and compartmentalization of CD19 receptor on the cell surface of when phosphorylated on Tyr-346 and/or Tyr-376. Interacts with PLCG2 when phosphorylated on Tyr-402. Interacts with LYN. Interacts (when tyrosine phosphorylated) with the regulatory p85 subunit of phosphatidylinositol 3-kinase (PIK3R1 or PIK3R2).Post-translational modificationPhosphorylated on tyrosine following B-cell activation (PubMed:20101619). Phosphorylated on tyrosine residues by LYN (By similarity). Tyrosine residues are phosphorylated sequentially after activation of the B cell receptor. Phosphorylation of Tyr-522 is extremely rapid, followed by phosphorylation at Tyr-402. In contrast, phosphorylation of Tyr-493 appears more slowly and is more transient, returning rapidly to basal levels (PubMed:20101619).Target Relevance information above includes information from UniProt accession: P25918The UniProt Consortium|