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Journal Article
Research Support, Non-U.S. Gov't
SH2 Superbinder Modified Monolithic Capillary Column for the Sensitive Analysis of Protein Tyrosine Phosphorylation.
Journal of Proteome Research 2018 January 6
In this study, we present a method to specifically capture phosphotyrosine (pTyr) peptides from minute amount of sample for the sensitive analysis of protein tyrosine phosphorylation. We immobilized SH2 superbinder on a monolithic capillary column to construct a microreactor to enrich pTyr peptides. It was found that the synthetic pTyr peptide could be specifically enriched by the microreactor from the peptide mixture prepared by spiking of the synthetic pTyr peptide into the tryptic digests of α-casein and β-casein with molar ratios of 1:1000:1000. The microreactor was further applied to enrich pTyr peptides from pervanadate-treated HeLa cell digests for phosphoproteomics analysis, which resulted in the identification of 796 unique pTyr sites. In contrast, the conventional SH2 superbinder-based method identified 41 pTyr sites for the same sample, only 5.2% of the number achieved by the microreactor. Finally, this microreactor was also applied to analyze the pTyr in Shc1 complex, an immunopurified protein complex, which resulted in the identification of 15 pTyr sites. Together, this technique is best fitted to analyze the pTyr in minute amount of sample and will have broad application in fields where only a limited amount of sample is available.
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