Abstract
Peptide immunoaffinity enrichment coupled with targeted mass spectrometry is a quantitative approach for the robust and reproducible quantification of peptide analytes. The approach is capable of multiplexed quantification of peptides, including posttranslational modifications such as phosphorylation. Anti-peptide antibodies are used to enrich analytes and heavy stable isotope-labeled standards. The enriched peptides are directly measured by multiple reaction monitoring (MRM), a well-characterized quantitative mass spectrometry-based method. Quantification is performed by measuring the analyte (light) peptide response relative to the heavy standard, which is spiked at a known concentration. Here, we describe the methodology for multiplexed measurement of phosphorylated peptides on the ATM kinase and their nonmodified peptide analogs in cellular lysates. The method provides quantitative measurements of phospho-signaling and can be extended to a number of other phosphopeptides and sample types.
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Acknowledgments
This work was funded by the Clinical Proteomic Tumor Analysis Consortium (CPTAC) of the US National Cancer Institute (U24CA160034).
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Whiteaker, J.R., Zhao, L., Schoenherr, R.M., Kennedy, J.J., Ivey, R.G., Paulovich, A.G. (2017). Peptide Immunoaffinity Enrichment with Targeted Mass Spectrometry: Application to Quantification of ATM Kinase Phospho-Signaling. In: Kozlov, S. (eds) ATM Kinase. Methods in Molecular Biology, vol 1599. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6955-5_15
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DOI: https://doi.org/10.1007/978-1-4939-6955-5_15
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