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Related Concept Videos

Glycosaminoglycans01:23

Glycosaminoglycans

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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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Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining
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Methods for Measuring Exchangeable Protons in Glycosaminoglycans.

Consuelo N Beecher1, Cynthia K Larive2

  • 1Department of Chemistry and Biochemistry, College of the Canyons, Santa Clarita, CA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|October 9, 2021
PubMed
Summary
This summary is machine-generated.

NMR studies reveal intramolecular hydrogen bonds in glycosaminoglycans (GAGs), offering insights into their secondary structures. Detecting these bonds requires specific conditions for sulfamate and hydroxyl protons, but advances promise better structural analysis.

Keywords:
Activation energyChemical exchangeChemical shift differenceEXSYGlycosaminoglycanHydrogen bondNMRTemperature coefficient

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Area of Science:

  • Biochemistry and Biophysics
  • Structural Biology
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Glycosaminoglycans (GAGs) are complex carbohydrates with vital biological roles.
  • Understanding GAG secondary structure is crucial for elucidating their functions.
  • Intramolecular hydrogen bonds significantly influence molecular conformation and stability.

Purpose of the Study:

  • To explore the potential of NMR spectroscopy for detecting intramolecular hydrogen bonds in GAGs.
  • To identify methods for observing exchangeable protons (amide, sulfamate, hydroxyl) in GAGs.
  • To gain insights into GAG secondary structure preferences through hydrogen bond analysis.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy of GAGs in aqueous solution.
  • Optimization of solution conditions (pH, temperature) to reduce proton exchange rates.
  • Application of established hydrogen bond detection techniques: temperature coefficient measurements, chemical shift analysis, line shape analysis, and EXSY (Exchange Spectroscopy).

Main Results:

  • NMR successfully detected exchangeable protons (amide, sulfamate, hydroxyl) under specific conditions.
  • Various NMR-based methods were effective in identifying intramolecular hydrogen bonds in GAGs.
  • Molecular dynamic simulations were utilized to predict and confirm hydrogen bond interactions.

Conclusions:

  • NMR spectroscopy is a powerful tool for characterizing intramolecular hydrogen bonds in GAGs.
  • These hydrogen bonds provide critical information about GAG secondary structure.
  • Emerging NMR strategies and computational methods hold significant promise for future GAG structural studies.