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Quantitative Phosphoproteomics in Fatty Acid Stimulated Saccharomyces cerevisiae
Published on: October 12, 2009
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Microamount Phosphopeptide-Enrichment-System-Based Phosphoproteomic Analysis for Small Numbers of Cells and Single
Qiong Wu1, Lan-Rui Cao2, Yi-Rong Jiang1
1Institute of Microanalytical Systems, Department of Chemistry, Zhejiang University, Hangzhou 310058, China.
Analytical Chemistry
|April 16, 2025
Summary
Researchers developed a microamount phosphopeptide enrichment system (mPES) for ultra-trace phosphoproteomics. This novel method enables sensitive analysis of phosphopeptides from picogram amounts of cell samples, advancing cellular regulation studies.
Area of Science:
- Proteomics
- Cellular Biology
- Analytical Chemistry
Background:
- Protein phosphorylation is crucial for cellular regulation and signal transduction.
- Existing phosphoproteomic methods often require larger sample amounts, limiting analysis of trace samples.
Purpose of the Study:
- To develop a microamount phosphopeptide enrichment system (mPES) for highly sensitive phosphoproteomic analysis.
- To establish a complete workflow for analyzing phosphoproteomics in trace cell samples, down to picogram levels.
Main Methods:
- Utilized microfluidics and solid-phase microextraction (SPME) to create the mPES.
- Developed a workflow including cell capture, lysis, proteolysis, phosphopeptide enrichment, and LC-MS/MS detection.
- Performed enrichment and pretreatment in nanoliter-scale volumes to enhance efficiency and reduce sample loss.
Main Results:
- Successfully analyzed phosphorylation in as few as 1-10 HeLa cells, identifying up to 227 phosphopeptides.
- Observed significant increases in phosphopeptide intensities (2.80-9.95 times) compared to controls.
- Identified an average of 221 phosphoproteins in single germinal vesicle (GV) oocytes and 460 in single metaphase II (MII) oocytes.
Conclusions:
- The mPES enables efficient phosphoproteomic profiling of extremely low-input samples.
- This technology provides a single-cell perspective for studying complex biological processes like oocyte maturation.
- mPES significantly advances the sensitivity and scope of phosphoproteomic analysis.
