Abstract
Tyrosine phosphorylation on proteins is an important posttranslational modification that regulates various processes in cells. Mass spectrometry-based phosphotyrosine profiling can reveal tyrosine kinase signaling activity in cells. Using quantitative proteomics strategies such as stable isotope labeling with amino acids in cell culture (SILAC) allows comparison of tyrosine kinase signaling activity across two to -three different conditions. In this book chapter, we discuss the reagents required and a step-by-step protocol to carry out phosphotyrosine profiling using SILAC.
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