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Related Concept Videos

Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
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Protein Glycosylation01:25

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Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
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Updated: Sep 26, 2025

Characterization of Glycoproteins with the Immunoglobulin Fold by X-Ray Crystallography and Biophysical Techniques
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Measuring change in glycoprotein structure.

Mary Rachel Nalehua1, Joseph Zaia2

  • 1Bioinformatics Program, Boston University, United States.

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This summary is machine-generated.

Glycoprotein glycosylation is complex and varies at each site. New mass spectrometry methods are essential for accurately quantifying these glycosylation changes during biological processes.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Mass Spectrometry

Background:

  • Glycoproteins exhibit heterogeneous glycosylation due to incomplete biosynthetic reactions.
  • Measuring only protein abundance is insufficient; glycosylation distribution must be quantified.
  • Existing mass spectrometry methods (data-dependent and data-independent acquisition) have limitations in glycopeptide analysis.

Purpose of the Study:

  • To review recent advances in mass spectrometry technologies and glycoproteomics analysis strategies.
  • To highlight how these developments improve the quantification of glycoprotein glycosylation changes.
  • To discuss the need for standardized approaches in glycoproteomics.

Main Methods:

  • Review of emerging mass spectrometry technologies for deep and comprehensive sampling.
  • Analysis of strategies for high-confidence assignment of complex glycopeptide mixtures.
  • Discussion of improvements in glycopeptide characterization using activated electron dissociation and ion mobility.

Main Results:

  • Emerging mass spectrometry technologies enable deeper and more comprehensive sampling of glycopeptides.
  • Advanced analytical strategies improve the selective and high-confidence assignment of glycopeptide mixtures.
  • Activated electron dissociation and ion mobility enhance glycopeptide characterization.

Conclusions:

  • Accurate quantification of glycoprotein glycosylation flux requires advanced mass spectrometry.
  • New technologies and algorithms are crucial for understanding glycosylation dynamics.
  • Standardization is needed for interlaboratory collaboration and monitoring glycoprotein structural changes.