An Internal Standard for Assessing Phosphopeptide Recovery from Metal Ion/Oxide Enrichment Strategies.

An Internal Standard for Assessing Phosphopeptide Recovery from Metal Ion/Oxide Enrichment Strategies.
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评估金属离子/氧化物富集策略中磷酸肽回收率的内标。

DOI:
10.1007/s13361-018-1946-6
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发表时间:
2018-07
影响因子:
3.2
通讯作者:
Gygi SP
Gygi SP
中科院分区:
化学3区
文献类型:
--
作者:
Paulo JA;Navarrete-Perea J;Erickson AR;Knott J;Gygi SP

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Phosphorylation-mediated signaling pathways have major implications in cellular regulation and disease. However, proteins with roles in signaling pathways are frequently less abundant and phosphorylation is often sub-stoichiometric. As such, the efficient enrichment and subsequent recovery of phosphorylated peptides is vital. Mass spectrometry-based proteomics is a well-established approach for quantifying thousands of phosphorylation events in a single experiment. We designed a peptide internal standard-based assay directed toward sample preparation strategies for mass spectrometry analysis to understand better phosphopeptide recovery from enrichment strategies. We coupled mass-differential tandem mass tag (mTMT) reagents (specifically, TMTzero and TMTsuper-heavy), nine mass spectrometry-amenable phosphopeptides (phos9), and peak area measurements from extracted ion chromatograms to determine phosphopeptide recovery. We showcase this mTMT/phos9 recovery assay by evaluating three phosphopeptide enrichment workflows. Our assay provides data on the recovery of phosphopeptides, which complement other metrics, namely the number of identified phosphopeptides and enrichment specificity. Our mTMT/phos9 assay is applicable to any enrichment protocol in a typical experimental workflow irrespective of sample origin or labeling strategy.
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