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Description
CD19 Fc Chimera Protein, HumanProduct Specification Species Human Accession P15391 1 Amino Acid Sequence Pro20 Lys291, with C terminal human IgG Fc Expression System CHO Molecular Weight 73 88 kDa(Reducing) Purity >95% by SDS PAGE & SEC HPLC Endotoxin <0. 1EU g Conjugation Unconjugated Tag Human Fc Tag Physical Appearance Lyophilized Powder Storage Buffer PBS, pH7. 4, 5% trehalose Reconstitution Reconstitute at 0. 1 1mg mL according to the size in ultrapure water after rapid
Product Specification
| Species | Human |
| Accession | P15391-1 |
| Amino Acid Sequence | Pro20-Lys291, with C-terminal human IgG Fc |
| Expression System | CHO |
| Molecular Weight | 73-88 kDa(Reducing) |
| Purity | >95% by SDS-PAGE & SEC-HPLC |
| Endotoxin | <0.1EU/μg |
| Conjugation | Unconjugated |
| Tag | Human Fc Tag |
| Physical Appearance | Lyophilized Powder |
| Storage Buffer | PBS, pH7.4, 5% trehalose |
| Reconstitution | Reconstitute at 0.1-1mg/mL according to the size in ultrapure water after rapid centrifugation. |
| Stability & Storage |
· 12 months from date of receipt, lyophilized powder stored at -20 to -80℃. · 3 months, -20 to -80℃ under sterile conditions after reconstitution. · 1 week, 2 to 8℃ under sterile conditions after reconstitution. · Please avoid repeated freeze-thaw cycles. |
| Reference |
1. Zola H, et al. (2007) CD molecules 2006-human cell differentiation molecules. J Immunol Methods. 318 (1-2): 1-5. 2. Ho IC, et al. (2009) GATA3 and the T-cell lineage: essential functions before and after T-helper-2-cell differentiation. Nat Rev Immunol. 9 (2): 125-35. 3. Matesanz-Isabel J, et al. (2011) New B-cell CD molecules. Immunology Letters.134 (2): 104-12. 4. Carter RH, et al. (1992) CD19: lowering the threshold for antigen receptor stimulation of B lymphocytes. Science. 256 (5053): 105-7. |
Background
CD19 is a 95 kDa type-I transmembrane glycoprotein and a member of the immunoglobulin superfamily. It is extensively expressed on B cells during most stages of B-cell differentiation, with expression levels decreasing as B cells terminally differentiate into plasma cells. Genetic mapping places CD19 at the 16p11.2 locus on chromosome 16, where it encodes a 540 amino acid protein. This protein features two extracellular C-type IgSF domains and a large cytoplasmic tail of approximately 240 residues, which shows significant conservation between mice and humans.
CD19 functions as a signal-amplifying coreceptor, with its expression limited to B cells and follicular dendritic cells. It is part of a multimolecular complex on the B cell surface that includes CD21 (complement receptor type 2, CR2), the tetraspanin CD81, and CD225. Through its interaction with CD21, CD19 acts as a signal transducing component for antigens bound by complement. The co-ligation of the B cell receptor (BCR) and the CD19/CD21 complex significantly lowers the activation threshold of B cells by approximately two orders of magnitude.
Recognizing its role in B cell biology, CD19 has emerged as a potential target for monoclonal antibody therapy. Early data have shown its potential in B-cell depletion, presenting an attractive treatment option for autoimmune diseases and malignant B-cell lymphomas. The rationale for CD19 as a target for immunotherapy includes: (1) its expression on the majority of B-cell malignancies; (2) its early expression in the B-cell lineage, preceding even CD20; (3) its efficient internalization in lymphoma tumor models; and (4) its potential involvement in the development of B-cell cancers.
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