developmental stage:Expressed in early stage of myeloid and erythroid differentiation. ,function:Substrate of the antigen receptor-coupled tyrosine kinase. Plays a role in antigen receptor signaling for both clonal expansion and deletion in lymphoid cells. May also be involved in the regulation of gene expression. ,PTM:Phosphorylated by LYN; rapidly after cross-linking of surface IgM on B-cells. ,similarity:Contains 1 SH3 domain. ,similarity:Contains 4 cortactin repeats. ,subunit:Associates with the SH2 and SH3 domains of LCK. Binding to he LCK SH3 domain occurs constitutively , while binding to the LCK SH2 domain occurs only upon TCR stimulation. A similar binding pattern was observed with LYN , but not with FYN in which the FYN SH2 region associates upon TCR stimulation but the FYN SH3 region does not associate regardless of TCR stimulation. Directly associates with HAX1 , through binding to its C-terminal region. Interacts with HS1BP3. ,tissue specificity:Expressed only in tissues and cells of hematopoietic origin. ,
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