a tyrosine kinase of the Tec family. Plays a crucial role in B-cell ontogeny. Defects cause X-linked agammaglobulinemia, an immunodeficiency characterized by failure to produce mature B lymphocyte cells and associated with a failure of Ig heavy chain rearrangement. Truncated splice forms found in childhood leukemias may underlie radiation resistance of tumors through inhibition of apoptosis. Note: This description may include information from UniProtKB.
Protein type: Protein kinase, TK; Kinase, protein; Protein kinase, tyrosine (non-receptor); EC 126.96.36.199; TK group; Tec family
Chromosomal Location of Human Ortholog: Xq21.33-q22
Cellular Component: extrinsic to internal side of plasma membrane; mast cell granule; intracellular membrane-bound organelle; perinuclear region of cytoplasm; cytoplasm; plasma membrane; cytoplasmic vesicle; nucleus; cytosol; lipid raft
Molecular Function: identical protein binding; protein binding; phosphatidylinositol-3,4,5-triphosphate binding; metal ion binding; protein-tyrosine kinase activity; non-membrane spanning protein tyrosine kinase activity; ATP binding; receptor binding
Biological Process: I-kappaB kinase/NF-kappaB cascade; adaptive immune response; B cell activation; transcription, DNA-dependent; cell maturation; calcium-mediated signaling; T cell receptor signaling pathway; protein amino acid phosphorylation; toll-like receptor 2 signaling pathway; regulation of cell proliferation; activation of NF-kappaB transcription factor; MyD88-dependent toll-like receptor signaling pathway; regulation of B cell apoptosis; regulation of B cell cytokine production; B cell receptor signaling pathway; histamine secretion by mast cell; toll-like receptor signaling pathway; innate immune response; positive regulation of B cell differentiation; mesoderm development; cell differentiation; toll-like receptor 4 signaling pathway; transmembrane receptor protein tyrosine kinase signaling pathway
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.