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Related Concept Videos

Glycosaminoglycans01:23

Glycosaminoglycans

6.9K
Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
Hyaluronic...
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Proteoglycans01:05

Proteoglycans

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Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Protein Glycosylation01:25

Protein Glycosylation

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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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Oligosaccharide Assembly01:24

Oligosaccharide Assembly

3.5K
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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Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

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Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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Related Experiment Video

Updated: Jan 16, 2026

Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining
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Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining

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Glycosaminoglycans as Polyelectrolytes: Charge, Interactions, and Applications.

Gergo Peter Szekeres1,2, Eunjin Moon1,2, Johanna K Elter1,3

  • 1Institute of Chemistry and Biochemistry, Freie Universität Berlin, Altensteinstraße 23A, 14195, Berlin, Germany.

Chembiochem : a European Journal of Chemical Biology
|October 6, 2025
PubMed
Summary

Glycosaminoglycans (GAGs) are negatively charged biopolymers. Understanding their polyelectrolyte properties is key to designing new therapeutics and biomedical applications.

Keywords:
charge–charge interactionsglycosaminoglycansglycosaminoglycans mimeticspolyelectrolytes

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Area of Science:

  • Biochemistry
  • Biophysics
  • Polymer Science

Background:

  • Glycosaminoglycans (GAGs) are linear, negatively charged biopolymers essential for numerous biological processes.
  • Their biological functions are intricately linked to their sulfation patterns and chain lengths, which dictate binding affinities.
  • The polyanionic nature of GAGs drives many interactions through electrostatic forces, making a polyelectrolyte perspective crucial for understanding their roles.

Purpose of the Study:

  • To highlight how modern analytical techniques leverage the polyanionic character of GAGs to resolve fine structural details.
  • To emphasize the importance of understanding GAG charge-charge interactions for biological function.
  • To explore the potential of GAGs and their mimetics in therapeutic and biomedical applications.

Main Methods:

  • Utilizing advanced separation and analytical tools to probe GAG structure.
  • Applying polyelectrolyte theory to describe GAG charge-charge interactions.
  • Analyzing the relationship between GAG structure, charge distribution, and biological activity.

Main Results:

  • Modern analytical methods can exploit the polyanionic nature of GAGs to discern subtle structural characteristics.
  • A fundamental understanding of GAG charge-charge interactions is critical for elucidating their biological roles.
  • Modified GAGs and synthetic mimetics show promise for therapeutic development.

Conclusions:

  • Recognizing GAGs as polyelectrolytes provides essential insights into their mediation of biomolecular interactions in health and disease.
  • Understanding GAG charge distribution is vital for completing our knowledge of these fundamental biopolymers.
  • This knowledge facilitates the design of novel GAG-based therapeutics and biomedical tools.