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PEG Precipitation Followed by Albumin Depletion for Plasma Proteomics Analysis
Yanyang Wang1, Minqi Cai1, Yuning Song2
1Department of Nuclear Medicine, Center for Precision Medicine, Department of Laboratory Medicine, Health Management Center, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China.
Poly(ethylene glycol) (PEG) precipitation and albumin depletion enhance blood plasma proteomic analysis by reducing abundant proteins. This method expands the identification of potential blood biomarkers using mass spectrometry.
Area of Science:
- Proteomics
- Biochemistry
- Analytical Chemistry
Background:
- Mass spectrometry (MS)-based proteomic analysis of blood plasma is hindered by highly abundant proteins like albumin and immunoglobins.
- Existing methods struggle to effectively remove these interfering proteins, limiting comprehensive proteome coverage.
Purpose of the Study:
- To develop an improved sample preparation method for blood plasma proteomic analysis.
- To enhance the identification of low-abundance proteins and N-glycoproteins in plasma.
Main Methods:
- Utilized poly(ethylene glycol) (PEG) precipitation to remove abundant plasma proteins, excluding albumin.
- Applied albumin depletion techniques to the remaining plasma fraction.
- Conducted in-depth liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis on whole plasma, PEG-precipitated pellets, and albumin-depleted supernatants.
Main Results:
- PEG precipitation effectively removed certain highly abundant proteins, while albumin depletion targeted residual albumin.
- LC-MS/MS analysis identified a total of 5040 proteins across all processed fractions.
- The combined method significantly expanded plasma proteome coverage compared to analyzing whole plasma alone.
Conclusions:
- Poly(ethylene glycol) (PEG) precipitation combined with albumin depletion is an effective strategy for processing blood plasma for proteomics.
- This enhanced sample preparation method facilitates the discovery of a broader range of proteins, including potential blood biomarkers.
- The proposed method should be considered a general approach for advancing plasma proteomic studies.
