This LC-MS/MS-based analysis enables the characterization of the intact glycopeptides derived from a proteolyzed protein. Unlike general glycan analysis, this approach preserves site-specific information, providing detailed insights into glycoform heterogeneity and distribution.
It is often performed in conjunction with released glycan profiling and site occupancy measurements to increase confidence in both site assignment and glycan structure identification.
Purposes and applications for Glycosylation Site-specific Profile
Oncology
Site-specific glycan profiling helps identify abnormal glycosylation patterns on tumor-associated proteins. Changes in glycan structures at specific sites can affect tumor growth, immune evasion, and metastasis
Infectious diseases
Pathogens often display glycoproteins with distinct glycan signatures that influence host immune recognition. Site-specific profiling is used to map glycans on viral proteins, which is essential for vaccine design and understanding immune escape mechanisms
Immunology and Inflammatory Diseases
This analysis reveals how specific glycosylation sites on antibodies and receptors affect immune function. For example, Fc glycosylation of IgG antibodies directly impacts effector functions and anti-inflammatory activity. This information guides the design of therapeutic antibodies with optimized immune responses
Microbiome
Though emerging in microbiome research, site-specific glycan profiling can be applied to host proteins modified by microbial enzymes or to study glycoproteins from probiotic strains, helping understand how glycosylation influences gut health, immune modulation, and microbe–host communication
Biomarkers & diagnostics
Many clinically relevant biomarkers are glycoproteins whose site-specific glycosylation changes in disease. Profiling these changes enhances diagnostic specificity and sensitivity, particularly in diseases like cancer, liver disease, or inflammatory conditions
Other Fields
- Plant science: to study glycoproteins involved in defense and stress responses, and to monitor glycosylation in plant-derived biopharmaceuticals
- Agriculture: it aids in improving crop traits and allergenicity studies
- Nutraceuticals and cosmetics: ensure glycoprotein consistency and activity in functional foods or skincare. For Human Milk Oligosaccharides (HMOs) and milk glycoproteins, it provides detailed insights into site-dependent glycosylation
