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Profiling glycoprotein n-linked oligosaccharide by capillary electrophoresis
1Beckman Coulter Inc., Fullerton, CA 92835, USA. afchen@beckman.com
Electrophoresis
|December 16, 1998
Summary
This study presents a new method for analyzing N-linked oligosaccharides from glycoproteins. The technique combines chemical/enzymatic treatments with capillary electrophoresis and laser-induced fluorescence for high-resolution glycan fingerprinting.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Glycobiology
Background:
- Analysis of N-linked oligosaccharides is crucial for understanding glycoprotein function.
- Existing methods often struggle with complex mixtures, especially sialylated species.
Purpose of the Study:
- To develop a robust method for high-resolution analysis of N-linked oligosaccharides.
- To enable accurate glycan fingerprinting of glycoproteins, including sialic acid-containing species.
Main Methods:
- Glycoproteins undergo heat denaturation and reduction, followed by enzymatic release of N-linked oligosaccharides using PNGase F.
- Released oligosaccharides are derivatized with 8-aminopyrene-1,3,6-trisulfonate (APTS) via reductive amination.
- Separation and detection are achieved using capillary electrophoresis (CE) with laser-induced fluorescence (LIF).
Main Results:
- The APTS derivatization method minimizes desialylation and loss of fucose residues.
- Excellent recovery of a model N-linked oligosaccharide (A2F) was achieved.
- High-resolution profiles of heavily sialylated N-linked oligosaccharides from fetuin, EPO, and kallikrein were obtained.
Conclusions:
- The developed CE-LIF method provides sensitive and high-resolution analysis of N-linked oligosaccharides.
- This technique is effective for glycan fingerprinting of diverse glycoproteins, including those with complex sialylation patterns.