CD19 Recombinant Rabbit Monoclonal Antibody [JF099-9] (ET1702-74)

UNIPROT #

P15391

PROTEIN NAME

CD19

SYNONYMS

antibody;deficiency due to defect in CD19, included antibody;AW495831 antibody;B lymphocyte antigen CD19 antibody;B lymphocyte surface antigen B4 antibody;B-lymphocyte antigen CD19 antibody;B-lymphocyte surface antigen B4 antibody;B4 antibody;CD19 antibody;CD19 antigen antibody;CD19 molecule antibody;Cd19 protein antibody;CD19_HUMAN antibody;CVID3 antibody;Differentiation antigen CD19 antibody;Leu 12 antibody;Leu-12 antibody;Leu12 antibody;MGC109570 antibody;MGC12802 antibody;T-cell surface antigen Leu-12 antibody

TISSUE SPECIFICITY

Detected on marginal zone and germinal center B cells in lymph nodes. Detected on blood B cells (at protein level).

POST-TRANSLATIONAL MODIFICATION

Phosphorylated on tyrosine following B-cell activation. Phosphorylated on tyrosine residues by LYN. Tyrosine residues are phosphorylated sequentially after activation of the B cell receptor. Phosphorylation of Tyr-531 is extremely rapid, followed by phosphorylation at Tyr-409. In contrast, phosphorylation of Tyr-500 appears more slowly and is more transient, returning rapidly to basal levels (By similarity).

SUBCELLULAR LOCATION

Membrane, Membrane raft.

FUNCTION

CD19 is a transmembrane glycoprotein that contains two extracellular immunoglobulin-like domains. CD19 is selectively expressed on the cell surface of B-lymphocytes, where it activates intracellular signaling cascades involving both Ras and phosphatidylinositol 3-kinase pathways. Activation of CD19 results in cross-linking of the membrane protein immunoglobulin chains and the subsequent association with Src family protein tyrosine kinases (PTK). Expression of CD19 is continuous throughout B-cell development and through terminal differentiation of B-cells into plasma cells. CD19 forms functional complexes with B-lymphocyte surface proteins, including integrin b1, CD21 and CD81, which are involved in regulating B-cell development.