Gene Summary: The B lymphocyte antigen receptor is a multimeric complex that includes the antigen-specific component, surface immunoglobulin (Ig). Surface Ig non-covalently associates with two other proteins, Ig-alpha and Ig-beta, which are necessary for expression and function of the B-cell antigen receptor. This CD79B gene encodes the Ig-beta protein of the B-cell antigen component. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]General information above from NCBI
Catalytic activity: All-trans-retinol + NADP(+) = all-trans- retinal + NADPH.
Subunit structure: Heterodimer of alpha and beta chains; disulfide-linked. Part of the B-cell antigen receptor complex where the alpha/beta chain heterodimer is non-covalently associated with an antigen- specific membrane-bound surface immunoglobulin of two heavy chains and two light chains. Interacts with LYN (By similarity).
Subcellular location: Cell membrane; Single-pass type I membrane protein. Note=Following antigen binding, the BCR has been shown to translocate from detergent-soluble regions of the cell membrane to lipid rafts although signal transduction through the complex can also occur outside lipid rafts (By similarity).
Tissue specificity: B-cells.
Induction: By retinoic acid.
Post-translational: Phosphorylated on tyrosine upon B-cell activation by SRC-type Tyr-kinases such as BLK, LYN and SYK.
Involvement in disease: Agammaglobulinemia 6, autosomal recessive (AGM6) [MIM:612692]: A primary immunodeficiency characterized by profoundly low or absent serum antibodies and low or absent circulating B cells due to an early block of B-cell development. Affected individuals develop severe infections in the first years of life. Note=The disease is caused by mutations affecting the gene represented in this entry.
Sequence similarity: Contains 1 Ig-like V-type (immunoglobulin-like) domain.
Contains 1 ITAM domain.
General information above from UniProt