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Title: Growth factors stimulate tyrosine dephosphorylation of p75 and its dissociation from the SH2 domain of Grb2
Authors: Lim, Y.P. 
Low, B.C. 
Ong, S.H. 
Guy, G.R. 
Issue Date: 21-Nov-1997
Citation: Lim, Y.P., Low, B.C., Ong, S.H., Guy, G.R. (1997-11-21). Growth factors stimulate tyrosine dephosphorylation of p75 and its dissociation from the SH2 domain of Grb2. Journal of Biological Chemistry 272 (47) : 29892-29898. ScholarBank@NUS Repository.
Abstract: The growth factor receptor-binding protein (Grb2) has a key role in initiating the mitogen-activated protein kinase signaling cascade in major cell regulatory pathways. The binding of proteins to the SH2 domain of Grb2 has been reported to occur mainly after they are tyrosine-phosphorylated following receptor activation. Using an in vitro binding assay, immunoprecipitation, and Far Western techniques, we report that in quiescent cells a 75-kDa protein binds directly to the SH2 domain of Grb2. All of the tyrosine-phosphorylated p75 protein co-localizes with Grb2·Sos complex in the cytosolic fraction of the cell in vivo and undergoes tyrosine dephosphorylation when cells are treated with mitogenic ligands such as epidermal, platelet-derived, and fibroblast growth factors, endothelin-1, and bombesin but not tumor necrosis factor-α, interferon-α and -γ interleukein-6, and leukemic inhibitory factor, which are either cell growth inhibitory or not significantly mitogenic. The dephosphorylation of p75 and the ensuing dissociation from Grb2 is rapid, occurring within 30 s following mitogenic stimulation by ligands such as epidermal growth factor, suggesting p75 to be an early component in the signal transduction pathways involving Grb2.
Source Title: Journal of Biological Chemistry
ISSN: 00219258
DOI: 10.1074/jbc.272.47.29892
Appears in Collections:Staff Publications

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