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Phosphopeptide Enrichment Coupled with Label-free Quantitative Mass Spectrometry to Investigate the Phosphoproteome in Prostate Cancer
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Phosphopeptide enrichment using microscale titanium dioxide solid phase extraction.

Ying-Qing Yu1, Jennifer Fournier, Martin Gilar

  • 1Waters Corporation, Milford, MA 01757, USA.

Journal of Separation Science
|March 21, 2009
PubMed
Summary
This summary is machine-generated.

Titanium dioxide (TiO2) solid-phase extraction effectively enriches phosphopeptides, improving proteomic analysis. Additives enhance selectivity by reducing interference from nonphosphorylated peptides.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biochemistry

Background:

  • Phosphopeptide identification via mass spectrometry (MS) is difficult due to low abundance and ionization efficiency.
  • Existing affinity enrichment methods include immobilized metal affinity chromatography (IMAC).
  • Titanium dioxide (TiO2) solid-phase extraction (SPE) offers a potential alternative for phosphopeptide enrichment.

Purpose of the Study:

  • To evaluate TiO2 SPE for phosphopeptide enrichment using a 96-well microscale extraction plate.
  • To investigate the impact of loading conditions and organic additives on phosphopeptide recovery and selectivity.
  • To compare the performance of TiO2 SPE with IMAC.

Main Methods:

  • Phosphopeptide enrichment using TiO2 packed in a 96-well plate under vacuum.
  • Investigation of various loading conditions and organic additives (e.g., dihydroxybenzoic acid derivatives).
  • Comparison of TiO2 SPE with IMAC using yeast lysate digest.

Main Results:

  • Organic additives improved enrichment selectivity by reducing acidic, nonphosphorylated peptide binding to TiO2.
  • Additives also affected phosphopeptide interaction, leading to reduced recovery.
  • TiO2 SPE, particularly with 2,5-dihydroxybenzoic acid, successfully extracted phosphopeptides from yeast lysate, minimizing interference.

Conclusions:

  • TiO2 SPE is a viable method for phosphopeptide enrichment.
  • Optimizing additive use is crucial for balancing selectivity and recovery.
  • This method enhances phosphoproteomic analysis by reducing interference from nonphosphorylated peptides.