Abstract
Direct measurement of site-specific phosphorylation stoichiometry can unambiguously distinguish whether the degree of phosphorylation is regulated by upstream kinase/phosphatase activity or by transcriptional regulation to alter protein expression level. Here, we describe a motif-targeting quantitative proteomic approach that integrates dephosphorylation, isotope tag labeling, and enzymatic kinase reaction for large-scale phosphorylation stoichiometry measurement of the human proteome.
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