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Related Concept Videos

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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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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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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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

3.0K
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...
3.0K
Glycocalyx and its Functions01:14

Glycocalyx and its Functions

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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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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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Modeling glycosaminoglycan-protein complexes.

Małgorzata M Kogut1, Mateusz Marcisz1, Sergey A Samsonov1

  • 1Faculty of Chemistry, University of Gdańsk, ul. Wita Stwosza 63, 80-308, Gdańsk, Poland.

Current Opinion in Structural Biology
|February 13, 2022
PubMed
Summary
This summary is machine-generated.

Characterizing protein-glycosaminoglycan complexes is vital for understanding biological functions. Theoretical methods like molecular docking aid in studying these complex interactions.

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Detection of Glycosaminoglycans by Polyacrylamide Gel Electrophoresis and Silver Staining
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Area of Science:

  • Biochemistry and Molecular Biology
  • Extracellular Matrix Research
  • Computational Biology

Background:

  • Glycosaminoglycans (GAGs) are essential polysaccharides in the mammalian extracellular matrix.
  • Understanding GAG-protein interactions is key to elucidating biological mechanisms.
  • Experimental characterization of these complexes is often challenging.

Purpose of the Study:

  • To review current theoretical approaches for investigating noncovalent protein-GAG complexes.
  • To summarize methods for analyzing molecular structure, dynamics, and interactions.
  • To highlight computational strategies for interpreting experimental data.

Main Methods:

  • Molecular docking simulations
  • Free binding energy calculations
  • Modeling of ion effects on binding
  • Analysis of multipose binding phenomena

Main Results:

  • Theoretical techniques offer valuable insights where experimental methods are limited.
  • Specific computational approaches can model complex GAG-protein interactions.
  • These methods aid in hypothesis generation and data interpretation.

Conclusions:

  • Theoretical approaches are crucial for advancing the study of protein-GAG complexes.
  • Computational methods provide a powerful toolkit for understanding GAG biological roles.
  • Further development and application of these techniques will enhance biological understanding.