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Related Concept Videos

Glycosaminoglycans01:23

Glycosaminoglycans

4.9K
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

4.0K
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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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...
4.0K
Oligosaccharide Assembly01:24

Oligosaccharide Assembly

2.9K
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...
2.9K
Protein Glycosylation01:25

Protein Glycosylation

7.1K
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...
7.1K
Glycocalyx and its Functions01:14

Glycocalyx and its Functions

4.3K
The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
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Related Experiment Video

Updated: Aug 4, 2025

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: What Remains To Be Deciphered?

Serge Perez1, Olga Makshakova2, Jesus Angulo3

  • 1Centre de Recherche sur les Macromolecules, Vegetales, University of Grenoble-Alpes, Centre National de la Recherche Scientifique, Grenoble F-38041 France.

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Summary

Glycosaminoglycans (GAGs) are complex molecules with diverse functions. New bioinformatic and AI approaches are needed to fully understand their structures, interactions, and the "glycocodes" they carry.

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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases

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Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining
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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases

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Area of Science:

  • Biochemistry
  • Glycobiology
  • Bioinformatics

Background:

  • Glycosaminoglycans (GAGs) are structurally diverse polysaccharides involved in numerous biological interactions.
  • Their functions are influenced by chemical modifications, conformation, and molecular context, including proteoglycan core proteins.
  • Current understanding of GAG "glycocodes" and their recognition mechanisms is incomplete due to limited analytical tools.

Purpose of the Study:

  • To review emerging approaches for deciphering GAG structural and functional complexity.
  • To highlight the need for advanced bioinformatic tools for GAGomic data analysis.
  • To explore the integration of GAG analysis with proteomics for a comprehensive understanding.

Main Methods:

  • Synthesis of diverse glycosaminoglycan (GAG) oligosaccharide libraries.
  • Advanced analytical techniques including mass spectrometry (ion mobility-MS), gas-phase infrared spectroscopy, and nanopore sequencing.
  • Molecular modeling, biophysical methods, and artificial intelligence for GAGomic data analysis and integration.

Main Results:

  • Development of methods for creating extensive GAG libraries.
  • Identification of bioactive GAG sequences and investigation of binding interfaces.
  • Advancement in understanding GAG glycocodes and molecular recognition.

Conclusions:

  • New synthetic, analytical, and computational strategies are crucial for advancing GAG research.
  • Integrating GAGomic data with proteomics using AI will deepen insights into GAG functions.
  • Further research is needed to fully characterize the structural and functional landscape of GAGs.