B-cell antigen receptor complex-associated protein alpha chain (CD79A)

Required in cooperation with CD79B for initiation of the signal transduction cascade triggered by binding of antigen to the B-cell antigen receptor complex (BCR) which contributes to internalization of the complex, trafficking to late endosomes and antigen presentation. Also required for BCR surface expression and for efficient differentiation of pro- and pre-B-cells.

Stimulates SYK autophosphorylation and activation. Binds to BLNK, bringing BLNK into proximity with SYK and allowing SYK to phosphorylate BLNK.