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- W2003019832 abstract "We have developed a multi-protease approach that allows sensitive and comprehensive mapping of protein phosphorylation sites. The combined application of the low-specificity proteases elastase, proteinase K, and thermolysin in addition to trypsin results in high sequence coverage, a prerequisite for comprehensive phosphorylation site mapping. Phosphopeptide enrichment is performed with the recently introduced phosphopeptide affinity material titansphere. We have optimized the selectivity of the phosphopeptide enrichment with titansphere, without compromising the high recovery rate of ∼90%. Phosphopeptide-enriched fractions are analyzed with a highly sensitive nanoLC−MS/MS system using a 25-μm-i.d. reversed-phase column, operated at a flow rate of 25 nL/min. The new approach was applied to the murine circadian protein period 2 (mPER2). A total of 21 phosphorylation sites of mPER2 have been detected by the multi-protease approach, whereas only 6 phosphorylation sites were identified using solely trypsin. Titansphere proved to be well suited for the enrichment of a large variety of phosphopeptides, including peptides carrying two, three, or four phosphorylated residues, as well as phosphopeptides containing more basic than acidic amino acids." @default.
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- W2003019832 date "2005-07-12" @default.
- W2003019832 modified "2023-10-02" @default.
- W2003019832 title "Mapping of Phosphorylation Sites by a Multi-Protease Approach with Specific Phosphopeptide Enrichment and NanoLC−MS/MS Analysis" @default.
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- W2003019832 doi "https://doi.org/10.1021/ac050232m" @default.
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