N-Glycoproteomics sample preparation using commercially available cellulose magnetic particles

Area of Science:

• Biochemistry
• Analytical Chemistry
• Proteomics

Background:

• Glycopeptide preparation is essential for bottom-up glycoproteomics.
• Existing methods can be complex and costly.
• Biological samples often contain impurities hindering analysis.

Purpose of the Study:

• To develop a robust and cost-effective method for N-glycopeptide preparation.
• To optimize N-glycopeptide enrichment using magnetic particles and hydrophilic interaction liquid chromatography (HILIC).
• To apply the method to complex biological samples like serum, plasma, and tissue extracts.

Main Methods:

• Utilized low-cost magnetic particles as a solid phase for HILIC.
• Compared carboxylated polymer beads and cellulose resin for N-glycopeptide enrichment.
• Integrated an optimized HILIC protocol with a single-pot solid-phase-enhanced sample preparation (SP3) protocol.
• Tested the method on blood-derived samples (serum/plasma) and tissue extracts.

Main Results:

• Cellulose-based magnetic particles showed higher efficiency in N-glycopeptide recovery and impurity removal.
• The combined HILIC-SP3 method improved digestion efficiency and N-glycopeptide recovery compared to in-solution digestion.
• The method successfully enriched N-glycopeptides from serum, plasma, and tissue samples.
• Applied to gastric cancer patient samples, revealing cancer-related glycoprotein alterations.

Conclusions:

• Developed a robust, cost-effective N-glycopeptide preparation method using magnetic particles.
• The method simplifies sample preparation and enhances glycopeptide enrichment from complex biological matrices.
• This technique is valuable for glycoproteomic analysis of clinical samples and disease biomarker discovery.