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Updated: Jun 23, 2026
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Phosphopeptide Enrichment Coupled with Label-free Quantitative Mass Spectrometry to Investigate the Phosphoproteome in Prostate Cancer
Published on: August 2, 2018
Magnetic bead processor for rapid evaluation and optimization of parameters for phosphopeptide enrichment
Scott B Ficarro1, Guillaume Adelmant, Maria N Tomar
1Department of Cancer Biology and Blais Proteomics Center, Dana-Farber Cancer Institute.
Analytical Chemistry
|May 5, 2009
Summary
This study introduces a magnetic bead-based platform for rapid optimization of phosphopeptide enrichment in proteomics. The method enables efficient identification of over 1000 phosphopeptides from minimal cell lysates.
Area of Science:
- Proteomics
- Biochemistry
- Molecular Biology
Background:
- Phosphorylation analysis is crucial but challenging in proteomics.
- Optimizing methods for rare phosphopeptides is difficult.
- Current techniques require complex, multi-variable approaches.
Purpose of the Study:
- To develop a platform for rapid evaluation of phosphopeptide enrichment parameters.
- To automate phosphopeptide enrichment and LC-MS/MS detection.
- To improve the analysis of low-abundance phosphopeptides.
Main Methods:
- Utilized a magnetic bead-based platform in a 96-well format.
- Focused on rapid evaluation of experimental parameters for phosphopeptide enrichment.
- Applied optimized methods for automated enrichment and LC-MS/MS detection.
Main Results:
- Successfully identified over 1000 unique phosphopeptides at approximately 1% FDR from 50 μg of cell lysates.
- Demonstrated the platform's utility for identifying phosphopeptides from SDS-PAGE separated proteins.
- Achieved identification of phosphopeptides visualized near the detection limit of silver staining.
Conclusions:
- The magnetic bead platform streamlines phosphopeptide enrichment optimization.
- This method facilitates high-throughput identification of phosphopeptides.
- The platform enhances the analysis of challenging phosphoproteomic samples.
