Mass spectrometry-based structure-specific N-glycoproteomics and biomedical applications

Area of Science:

• Biochemistry and Molecular Biology
• Proteomics
• Glycoscience

Background:

• N-linked glycosylation is a prevalent posttranslational modification, leading to macroheterogeneity.
• It introduces significant complexity (microheterogeneity) due to diverse glycan structures, affecting protein function.
• Site- and structure-specific analysis of N-glycosylation is vital for understanding its role in disease.

Purpose of the Study:

• To highlight the complexity of N-linked glycosylation and its impact on N-glycoproteins.
• To review advanced methodologies for site- and structure-specific N-glycoproteomics.
• To underscore the clinical significance of differentially expressed N-glycopeptides.

Main Methods:

• Advanced sample preparation techniques.
• Online liquid chromatography and ion mobility spectrometry for physical differentiation.
• Tandem mass spectrometry for analyzing intact N-glycopeptides and their heterogeneity.
• AI-based software and search engines for interpreting dissociation patterns.

Main Results:

• Tens of thousands of possible N-glycan structures arise from variations in composition, linkage, and conformation.
• Modern methods allow for detailed characterization of N-glycan macro- and microheterogeneity.
• Structure-specific N-glycoproteomics provides insights into clinical significance.

Conclusions:

• Structure-specific N-glycoproteomics is an essential tool in biomedical research.
• Understanding N-glycosylation complexity is key to deciphering protein function and disease mechanisms.
• Advanced analytical techniques are crucial for quantitative, site-, and structure-specific glycoproteomic studies.