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Molecular and Cellular Biology, February 2000, p. 979-989, Vol. 20, No. 3
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

FRS2 Proteins Recruit Intracellular Signaling Pathways by Binding to Diverse Targets on Fibroblast Growth Factor and Nerve Growth Factor Receptors

S. H. Ong,1 G. R. Guy,1 Y. R. Hadari,2 S. Laks,2 N. Gotoh,2 J. Schlessinger,2 and I. Lax2,*

Signal Transduction Laboratory, Institute of Molecular and Cell Biology, Singapore 117609, Singapore1 and Department of Pharmacology and the Skirball Institute, New York University School of Medicine, New York, New York 100162

Received 14 May 1999/Returned for modification 30 June 1999/Accepted 29 October 1999

The docking protein FRS2 was implicated in the transmission of extracellular signals from the fibroblast growth factor (FGF) or nerve growth factor (NGF) receptors to the Ras/mitogen-activated protein kinase signaling cascade. The two members of the FRS2 family, FRS2alpha and FRS2beta , are structurally very similar. Each is composed of an N-terminal myristylation signal, a phosphotyrosine-binding (PTB) domain, and a C-terminal tail containing multiple binding sites for the SH2 domains of the adapter protein Grb2 and the protein tyrosine phosphatase Shp2. Here we show that the PTB domains of both the alpha  and beta  isoforms of FRS2 bind directly to the FGF or NGF receptors. The PTB domains of the FRS2 proteins bind to a highly conserved sequence in the juxtamembrane region of FGFR1. While FGFR1 interacts with FRS2 constitutively, independent of ligand stimulation and tyrosine phosphorylation, NGF receptor (TrkA) binding to FRS2 is strongly dependent on receptor activation. Complex formation with TrkA is dependent on phosphorylation of Y490, a canonical PTB domain binding site that also functions as a binding site for Shc (NPXpY). Using deletion and alanine scanning mutagenesis as well as peptide competition assays, we demonstrate that the PTB domains of the FRS2 proteins specifically recognize two different primary structures in two different receptors in a phosphorylation-dependent or -independent manner. In addition, NGF-induced tyrosine phosphorylation of FRS2alpha is diminished in cells that overexpress a kinase-inactive mutant of FGFR1. This experiment suggests that FGFR1 may regulate signaling via NGF receptors by sequestering a common key element which both receptors utilize for transmitting their signals. The multiple interactions mediated by FRS2 appear to play an important role in target selection and in defining the specificity of several families of receptor tyrosine kinases.


* Corresponding author. Mailing address: Department of Pharmacology and the Skirball Institute, New York University School of Medicine, 550 First Ave., New York, NY 10016. Phone: (212) 263-7111. Fax: (212) 263-7133. E-mail: laxidi{at}mcrcrg.med.nyu.edu.


Molecular and Cellular Biology, February 2000, p. 979-989, Vol. 20, No. 3
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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