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. 1994 Oct 25;91(22):10484–10487. doi: 10.1073/pnas.91.22.10484

Lymphocyte antigen receptor activation of a focal adhesion kinase-related tyrosine kinase substrate.

S B Kanner 1, A Aruffo 1, P Y Chan 1
PMCID: PMC45045  PMID: 7524094

Abstract

One of the earliest responses of T and B lymphocytes to stimulation through their antigen receptors is the activation of protein tyrosine kinases and the tyrosine phosphorylation of multiple cellular substrates. Here we describe a tyrosine kinase substrate, fakB, a putative homologue of the focal adhesion kinase pp125FAK. Tyrosine phosphorylation of fakB was rapidly augmented in human T and B cells following antigen receptor cross-linking with antibody, while pp125FAK was nonresponsive. Costimulation of the T-cell antigen receptor (TCR/CD3) with either the CD2 or CD4 costimulatory receptors induced synergistic fakB tyrosine phosphorylation in normal human T cells. Engagement of TCR/CD3 induced the stable association of fakB with ZAP-70, the TCR/CD3 sigma-chain-associated tyrosine kinase involved in antigen receptor-induced T-cell activation. In addition, preformed complexes of fakB and ZAP-70 were observed in T-cell leukemia lines. Phosphorylation of fakB on serine, threonine, and tyrosine residues was observed both in vivo and in vitro, where a functional increase of in vitro kinase activity was observed following TCR/CD3 stimulation. fakB is thus a focal adhesion kinase-related tyrosine kinase substrate that is differentially regulated from that of pp125FAK and likely plays a role in antigen-induced lymphocyte signaling.

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Selected References

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