ZAP-70 Antibody – Mouse Monoclonal

This gene encodes an enzyme belonging to the protein tyrosine kinase family, and it plays a role in T-cell development and lymphocyte activation. This enzyme, which is phosphorylated on tyrosine residues upon T-cell antigen receptor (TCR) stimulation, functions in the initial step of TCR-mediated signal transduction in combination with the Src family kinases, Lck and Fyn. This enzyme is also essential for thymocyte development. Mutations in this gene cause selective T-cell defect, a severe combined immunodeficiency disease characterized by a selective absence of CD8-positive T-cells. Two transcript variants that encode different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ZAP70: a tyrosine kinase of the Syk family. Associates with the T-cell antigen receptor zeta-chain after TCR stimulation. Phosphorylated by Src-family kinases following antigen receptor activation. Plays a role in lymphocyte activation.

Protein type: Protein kinase, tyrosine (non-receptor); Protein kinase, TK; Kinase, protein; EC 2.7.10.2; TK group; Syk family

Chromosomal Location of Human Ortholog: 2q12

Cellular Component: T cell receptor complex; extrinsic to internal side of plasma membrane; cytoplasm; plasma membrane; immunological synapse; intercellular junction; cytosol; lipid raft

Molecular Function: protein binding; phosphotyrosine binding; protein-tyrosine kinase activity; non-membrane spanning protein tyrosine kinase activity; ATP binding; receptor binding

Biological Process: cell migration; adaptive immune response; peptidyl-tyrosine phosphorylation; B cell activation; T cell activation; positive regulation of calcium-mediated signaling; negative thymic T cell selection; protein amino acid phosphorylation; T cell receptor signaling pathway; positive regulation of T cell differentiation; innate immune response; immune response; positive regulation of alpha-beta T cell proliferation; beta selection; positive regulation of alpha-beta T cell differentiation; transmembrane receptor protein tyrosine kinase signaling pathway; T cell differentiation; positive thymic T cell selection

Disease: Selective T-cell Defect