GlycoFASP: A Universal Method to Prepare Complex Mixtures for O-Glycoproteomic Analysis

Area of Science:

• Glycoscience
• Proteomics
• Biochemistry

Background:

• O-glycosylation analysis is challenging due to heterogeneity and lack of consensus motifs.
• Mass spectrometry (MS)-based O-glycoprotein analysis requires extensive sample preparation.
• Existing enrichment methods for O-glycans are not universal.

Purpose of the Study:

• To develop a streamlined, one-pot method for O-glycoprotein enrichment.
• To improve the efficiency and breadth of O-glycopeptide identification.
• To make O-glycoprotein analysis more accessible to researchers.

Main Methods:

• Developed GlycoFASP, a one-pot preparation method utilizing O-glycoproteases on an MWCO filter.
• Selective proteolysis of glycoproteins based on dual peptide-glycan cleavage motifs.
• Comparison with existing enrichment methods like GBP, SAX-ERLIC, and digestion-based strategies.

Main Results:

• GlycoFASP requires minimal sample (1 mg) and protein purification.
• Achieved ≥70% O-glycoprotein signal in human serum, seminal fluid, and cell media.
• Identified over twice as many O-glycopeptides compared to other methods in human serum analysis.

Conclusions:

• GlycoFASP offers a robust, efficient, and cost-effective solution for O-glycoprotein enrichment.
• The method simplifies complex glycoscience research, enabling broader application.
• Facilitates the study of O-glycosylation across various biological samples.