Recombinant Mouse CD19 Fc Chimera Protein, CF

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Recombinant Mouse CD19 Fc Chimera Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Level
<1.0 EU per 1 μg of the protein by the LAL method.
Measured by its binding ability in a functional ELISA. When Recombinant Mouse CD19 Fc Chimera is immobilized at 2 µg/mL,100 µL/well, recombinant biotinylated human CD81 Fc Chimera binds with an ED50 of 7-35 μg/mL
Chinese Hamster Ovary cell line, CHO-derived mouse CD19 protein
Mouse CD19
Accession # P25918
Accession #
N-terminal Sequence
Arg19 and Ser68
Structure / Form
Disulfide-linked homodimer
Predicted Molecular Mass
57 kDa
78-95 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: CD19

CD19 is a 95 kDa transmembrane glycoprotein that plays a central role in B cell activation and humoral immune responses (1, 2). CD19 is expressed throughout B cell development from pre-B cells through mature B cells, and it is commonly used as a B cell lineage marker (1). It is required for the responsiveness of mature B cell to antigen stimulation, germinal center development, and antibody affinity maturation (4, 5). CD19 associates with the B cell antigen receptor (BCR), CD81, CD38, CD21, CD22, and IFITM1/CD225/Leu13, (6-9). These associations enable CD19 to amplify B cell signaling (7, 9-12) and reduce the threshold for antigen stimulation through the BCR (13). CD19 polymorphisms and up-regulation can lead to the development of autoimmunity by promoting autoantibody production (2). CD19 has emerged as promising therapeutic target for hematologic cancers and solid tumors. Immunotherapy using a chimeric antigen receptor (CAR) targeting CD19 has proven effective in many different cancers. The first CD19 CAR T cell therapies have been granted FDA approval for the treatment of B cell malignancies with several more in clinical trials. Mature human CD19 consists of a 272 amino acid (aa) extracellular domain (ECD) with two Ig-like domains, a 22 aa transmembrane segment, and a 243 aa cytoplasmic domain (3). Within the ECD, human CD19 shares 57% amino acid sequence identity with mouse and rat CD19.

  1. Wang, K. et al. (2012) Exp. Hematol. Oncol. 1:36.
  2. Tedder, T.F. et al. (1997) Immunity 6:107.
  3. Tedder, T.F. and C.M. Isaacs (1989) J. Immunol. 143:712.
  4. Rickert, R.C. et al. (1995) Nature 376:352.
  5. Engel, P. et al. (1995) Immunity 3:39.
  6. Vences-Catalan, F. et al. (2012) J. Immunol. 137:48.
  7. Deaglio, S. et al. (2007) Blood 109:5390.
  8. Bradbury, L. et al. (1992) J. Immunol. 149:2841.
  9. Krop, I. et al. (1996) J. Immunol. 157:48.
  10. O'Rourke, L.M. et al. (1998) Immunity 8:635.
  11. Buhl, A.M. et al. (1997) J. Exp. Med. 186:1897.
  12. Sato, S. et al. (1995) Proc. Natl. Acad. Sci. USA 92:11558.
  13. Carter, R.H. and D.T. Fearon (1992) Science 256:105.
Entrez Gene IDs
930 (Human); 12478 (Mouse); 365367 (Rat); 397669 (Porcine); 607898 (Canine); 102145514 (Cynomolgus Monkey); 100147468 (Equine)
Alternate Names
B4; B-lymphocyte antigen CD19; B-lymphocyte surface antigen B4; CD19 antigen; CD19 molecule; CD19; CVID3; Differentiation antigen CD19; Leu-12; MGC12802; T-cell surface antigen Leu-12

Citation for Recombinant Mouse CD19 Fc Chimera Protein, CF

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

1 Citation: Showing 1 - 1

  1. Noncanonical binding of Lck to CD3&epsilon promotes TCR signaling and CAR function
    Authors: FA Hartl, E Beck-Garcì, NM Woessner, LJ Flachsmann, RMV Cárdenas, SM Brandl, S Taromi, GJ Fiala, A Morath, P Mishra, OS Yousefi, J Zimmermann, N Hoefflin, M Köhn, BM Wöhrl, R Zeiser, K Schweimer, S Günther, WW Schamel, S Minguet
    Nat. Immunol., 2020-07-20;21(8):902-913.
    Species: Mouse
    Sample Types: Whole Cells
    Applications: Cell Culture


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Recombinant Mouse CD19 Fc Chimera Protein, CF
By Jenna Nguyen on 07/24/2020
Application: Binding assay/Protein-protein interaction

Recombinant Mouse CD19 Fc Chimera Protein, CF
By Jenna Nguyen on 05/18/2020
Application: CellProlif