IMP-10104

CD19

Alexa Fluor 647 conjugated recombinant human CD19 protein (Glu21-Lys291) with a human IgG1 (Pro100-Lys330) Fc tag at C-terminus was expressed in Chinese Hamster Ovary cell line.
Labeled with Alexa Fluor 647
Excitation Wavelength: 650 nm
Emission Wavelength: 668 nm

This gene encodes a member of the immunoglobulin gene superfamily. Expression of this cell surface protein is restricted to B cell lymphocytes. This protein is a reliable marker for pre-B cells but its expression diminishes during terminal B cell differentiation in antibody secreting plasma cells. The protein has two N-terminal extracellular Ig-like domains separated by a non-Ig-like domain, a hydrophobic transmembrane domain, and a large C-terminal cytoplasmic domain. This protein forms a complex with several membrane proteins including complement receptor type 2 (CD21) and tetraspanin (CD81) and this complex reduces the threshold for antigen-initiated B cell activation. Activation of this B-cell antigen receptor complex activates the phosphatidylinositol 3-kinase signalling pathway and the subsequent release of intracellular stores of calcium ions. This protein is a target of chimeric antigen receptor (CAR) T-cells used in the treatment of lymphoblastic leukemia. Mutations in this gene are associated with the disease common variable immunodeficiency 3 (CVID3) which results in a failure of B-cell differentiation and impaired secretion of immunoglobulins. CVID3 is characterized by hypogammaglobulinemia, an inability to mount an antibody response to antigen, and recurrent bacterial infections. Alternative splicing results in multiple transcript variants encoding distinct isoforms.

CHO

Human

C-Fc

Glu21

Supplied as a 0.2 μm filtered solution in PBS with BSA as a carrier protein.

Alexa Fluor 647

Predicted Molecular Mass: 57 kDa
SDS-PAGE: 77-92 kDa, reducing conditions

Glu21-Lys291

Measured by flow cytometry for its ability to bind anti-Human CD19 Monoclonal Antibody conjugated beads. The concentration of Recombinant Human CD19 Fc Chimera Alexa Fluor 647 that produces 50% of the binding is 10.0-100 ng/mL.

<1.0 EU/μg of the protein by the LAL method.

>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie Blue Staining.

Disulfide-linked homodimer

Protect from light. Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
6 months from date of receipt, -20 to -70 centigrade as supplied.
1 month, 2 to 8 centigrade under sterile conditions after opening.
3 months, -20 to -70 centigrade under sterile conditions after opening.