Zap-70, a Syk-family protein tyrosine kinase, plays a critical role in mediating T cell signal transduction in response to T cell receptor (TCR) activation (1). TCR-mediated activation of the Src-family kinases, Lck and Fyn, results in tyrosine phosphorylation of the TCR zeta and CD3 chains. These domains serve as targets for binding of ZAP-70 via its tandem SH2 domains. This binding correlates with activation of ZAP-70, a critical event in T cell activation (2). Following TCR engagement, ZAP-70 is phosphorylated on several tyrosine residues, presumably by two mechanisms: an autophosphorylation and a trans-phosphorylation by the Src-family tyrosine kinase, Lck. Phosphorylation of Tyr319 is required for full activation and increased positive downstream regulation by ZAP-70 (3).

Long Name

Zeta-chain [TCR] Associated Protein Kinase 70 kDa

Alternate Names

mrtle, mur, SRK, STD, TZK

Gene Symbol

ZAP70

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Product Specific Notices for ZAP70 Antibody (ZAP70/4040R) [Janelia Fluor® 646]

Sold under license from the Howard Hughes Medical Institute, Janelia Research Campus.

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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ZAP70 Antibody (ZAP70/4040R) [Janelia Fluor® 646]

Novus Biologicals, part of Bio-Techne | Catalog # NBP3-08968JF646

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Immunohistochemistry-Paraffin

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Background: ZAP70