Quantitative phosphotyrosine proteomics of EphB2 signaling by stable isotope labeling with amino acids in cell culture (SILAC)

Journal of Proteome Research
Guoan ZhangThomas A Neubert

Abstract

Eph-related receptor tyrosine kinases (RTK) have been implicated in several biological functions including synaptic plasticity, axon guidance, and morphogenesis, yet the details of the signal transduction pathways that produce these specific biological functions after ligand-receptor interaction remain unclear. We used Stable Isotope Labeling by Amino Acids in Cell Culture (SILAC) in combination with LC-MS/MS to characterize cellular signaling following stimulation by ephrinB1-Fc of NG-108 cells that overexpress EphB2 receptors. Because tyrosine phosphorylation functions as a key regulatory event in RTK signaling, we used anti-phosphotyrosine immunoprecipitation (pY IP) of cell lysates to isolate potential participants in the EphB2 pathway. Our SILAC experiments identified 127 unique proteins, 40 of which demonstrated increased abundance in pY IPs from ephrinB1-Fc stimulated cells as compared with unstimulated cells. Six proteins demonstrated decreased abundance, and 81 did not change significantly in relative abundance. Western blotting analysis of five proteins after pY IP verified their SILAC results. On the basis of previously published work and use of PathwayAssist software, we proposed an interaction network downstream of...Continue Reading

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