Cloning of a Novel T-cell Protein FYB That Binds FYN and SH2-domain-containing Leukocyte Protein 76 and Modulates Interleukin 2 Production

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1997 Jul 8

PMID 9207119

Citations 95

Authors

A J da Silva

Z Li

C de Vera

E Canto

P Findell

C E Rudd

Affiliations

Soon will be listed here.

Abstract

T cell receptor zeta (TcRzeta)/CD3 ligation initiates a signaling cascade that involves src kinases p56(lck) and zeta-associated protein 70, leading to the phosphorylation of substrates such as TcRzeta, Vav, SH2-domain-containing leukocyte protein 76 (SLP-76), cbl, and p120/130. FYN binding protein (FYB or p120/130) associates with p59(fyn), the TcRzeta/CD3 complex, and becomes tyrosine-phosphorylated in response to receptor ligation. In this study, we report the cDNA cloning of human and murine FYB and show that it is restricted in expression to T cells and myeloid cells and possesses an overall unique hydrophilic sequence with several tyrosine-based motifs, proline-based type I and type II SH3 domain binding motifs, several putative lysine/glutamic acid-rich nuclear localization motifs, and a SH3-like domain. In addition to binding the src kinase p59(fyn), FYB binds specifically to the hematopoietic signaling protein SLP-76, an interaction mediated by the SLP-76 SH2 domain. In keeping with this, expression of FYB augmented interleukin 2 secretion from a T cell hybridoma, DC27.10, in response to TcRzeta/CD3 ligation. FYB is therefore a novel hematopoietic protein that acts as a component of the FYN and SLP-76 signaling cascades in T cells.

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