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CD19 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.

| Pack Size | Price | Availability | Quantity | 
|---|---|---|---|
| 5 μg | $58 | 7-10 days | |
| 10 μg | $92 | 7-10 days | |
| 20 μg | $148 | 7-10 days | |
| 50 μg | $289 | 7-10 days | |
| 100 μg | $487 | 7-10 days | |
| 200 μg | $883 | 7-10 days | |
| 500 μg | $1,950 | 7-10 days | 
| Biological Activity | Anti-CD19 Antibody, hFc Tag captured on CM5 Chip via Protein A can bind Cynomolgus/Rhesus macaque CD19, His Tag with an affinity constant of 0.46 μM as determined in SPR assay (Biacore T200). | 
| Description | CD19 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. | 
| Species | Cynomolgus,Rhesus | 
| Expression System | HEK293 Cells | 
| Tag | N-His | 
| Accession Number | A0A2K5W8L9(Cynomolgus) / F7F486(Rhesus macaque) | 
| Synonyms | MGC12802,Leu-12,CVID3,CD19,B4 | 
| Construction | Gln21-Trp291 | 
| Protein Purity | > 95% as determined by Bis-Tris PAGE | 
| Molecular Weight | 30.96 kDa (predicted). Due to glycosylation, the protein migrates to 50-70 kDa based on Tris-Bis PAGE result. | 
| Endotoxin | < 1 EU/μg by the LAL method. | 
| Formulation | Lyophilized from a solution filtered through a 0.22 μm filter, containing PBS (pH 7.4). Typically, 8% trehalose is incorporated as a protective agent before lyophilization. | 
| Reconstitution | Reconstitute the lyophilized protein in distilled water. The product concentration should not be less than 100 μg/ml. Before opening, centrifuge the tube to collect powder at the bottom. After adding the reconstitution buffer, avoid vortexing or pipetting for mixing. | 
| Stability & Storage | It is recommended to store recombinant proteins at -20°C to -80°C for future use. Lyophilized powders can be stably stored for over 12 months, while liquid products can be stored for 6-12 months at -80°C. For reconstituted protein solutions, the solution can be stored at -20°C to -80°C for at least 3 months. Please avoid multiple freeze-thaw cycles and store products in aliquots. | 
| Shipping | In general, Lyophilized powders are shipping with blue ice. | 
| Research Background | CD19 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. | 

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