PMID: 7538440May 1, 1995Paper

Reconstitution of Syk function by the ZAP-70 protein tyrosine kinase

Immunity
G KongA C Chan

Abstract

ZAP-70 and Syk are PTKs required for TCR and BCR function, respectively. Loss of the Syk PTK results in a nonfunctional BCR. We provide evidence here that ZAP-70 and Syk are functionally homologous in antigen receptor signaling by demonstrating that expression of ZAP-70 in Syk- B cells reconstitutes BCR function. Reconstitution required the presence of functional Src homology 2 (SH2) and catalytic domains of ZAP-70. Thus, drug targeting of a single SH2 domain within ZAP-70 should be sufficient to inhibit hematopoietic antigen receptor function. In addition, we demonstrate that both ZAP-70 and Syk can bind directly to the phosphorylated Ig alpha and Ig beta subunits with affinities comparable to their binding to the TCR CD3 epsilon subunit. These data suggest that ZAP-70 and Syk are comparable in their abilities to mediate hematopoietic antigen receptor signaling.

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