Browse Products By Molecule:

Products --> Bio-Markers & CD Antigens

Human CD19 (20-278) Protein, Fc Tag  pdf  pdf  pdf


Cat-Pack Size Price(USD) Qty Inventory Order
Quote for bulk   Worldwide Shipping & Payment
CD9-H5255-100ug
    $410.00
CD9-H5255-1mg (500ug x 2)
    $2880.00
In-stock
Place Purchase Orders


Synonym

CD19,B4,CVID3,MGC12802

Source

Human CD19 (20-278), Fc Tag (CD9-H5255) is expressed from human 293 cells (HEK293). It contains AA Pro 20 - Pro 278 (Accession # AAH06338).

Predicted N-terminus: Pro 20

Molecular Characterization

CD19(Pro 20 - Pro 278)AAH06338

Fc(Pro 100 - Lys 330)P01857

This protein carries a human IgG1 Fc tag at the C-terminus.

The protein has a calculated MW of 55.1 kDa. The protein migrates as 62-70 kDa on a SDS-PAGE gel under reducing (R) condition due to glycosylation.

Endotoxin

Less than 1.0 EU per μg by the LAL method.

 

Purity

>90% as determined by SDS-PAGE.

Formulation

Lyophilized from 0.22 μm filtered solution in 50 mM tris, 100 mM glycine, pH7.5. Normally trehalose is added as protectant before lyophilization.

Contact us for customized product form or formulation.

Reconstitution

Please see Certificate of Analysis for specific instructions.

For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.

Storage

For long term storage, the product should be stored at lyophilized state at -20°C or lower.

Please avoid repeated freeze-thaw cycles.

No activity loss is observed after storage at:

  1. 4-8°C for 12 months in lyophilized state;
  2. -70°C for 3 months under sterile conditions after reconstitution.
 

SDS-PAGE

Human CD19 (20-278), Fc Tag (Catalog # CD9-H5255) SDS-PAGE gel

Human CD19 (20-278), Fc Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 90%.

Bioactivity

Human CD19 (20-278), Fc Tag (Catalog # CD9-H5255) ELISA bioactivity

Immobilized Anti-CD19 Antibody, clone FMC63 (Catalog # CD9-M7) at 2μg/mL (100 μL/well) can bind Human CD19, Fc Tag (Catalog # CD9-H5255) with a linear range of 0.15-1.25 μg/mL.

Request for protocol

 

Background

B-lymphocyte antigen CD19 is also known as CD19 (Cluster of Differentiation 19), is a single-pass type I  membrane protein which contains two Ig-like C2-type (immunoglobulin-like) domains. CD19 is expressed on follicular dendritic cells and B cells. In fact, it is present on B cells from earliest recognizable B-lineage cells during development to B-cell blasts but is lost on maturation to plasma cells. It primarily acts as a B cell co-receptor in conjunction with CD21 and CD81. Upon activation, the cytoplasmic tail of CD19 becomes phosphorylated, which leads to binding by Src-family kinases and recruitment of PI-3 kinase. As on T cells, several surface molecules form the antigen receptor and form a complex on B lymphocytes. The (almost) B cell-specific CD19 phosphoglycoprotein is one of these molecules. The others are CD21 and CD81. These surface immunoglobulin (sIg)-associated molecules facilitate signal transduction. On living B cells, anti-immunoglobulin antibody mimicking exogenous antigen causes CD19 to bind to sIg and internalize with it. The reverse process has not been demonstrated, suggesting that formation of this receptor complex is antigen-induced. This molecular association has been confirmed by chemical studies. Mutations in CD19 are associated with severe immunodeficiency syndromes characterized by diminished antibody production. CD19 has been shown to interact with: CD81, CD82, Complement receptor 2, and VAV2.

References

Please contact us via TechSupport@acrobiosystems.com if you have any question on this product.