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Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

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...
Proteoglycans01:05

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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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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein Glycosylation01:25

Protein Glycosylation

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.
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Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases
09:54

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Published on: December 26, 2011

Identification of proteoglycan-binding proteins.

Takashi Muramatsu1, Hisako Muramatsu, Tetsuhito Kojima

  • 1Department of Health Science, Faculty of Psychological and Physical Sciences, Aichi Gakuin University, Aichi, Japan.

Methods in Enzymology
|November 23, 2006
PubMed
Summary

This study explores protein-proteoglycan interactions, detailing methods to identify binding partners using native proteoglycans like versican and syndecan-4. It highlights experimental procedures for analyzing these crucial molecular relationships.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Proteoglycans are key molecules in biological systems, interacting with a diverse range of proteins.
  • Understanding these interactions is crucial for deciphering cellular processes and disease mechanisms.

Purpose of the Study:

  • To describe experimental procedures for identifying proteins that bind to proteoglycans.
  • To detail methods for analyzing binding interactions involving the glycosaminoglycan (GAG) or protein portions of proteoglycans.

Main Methods:

  • Utilizing proteoglycans as ligands to discover binding proteins.
  • Employing ligand proteins to identify proteoglycan binding partners.
  • Analyzing binding using native proteoglycans (versican, syndecan-4) or recombinant core proteins.

Main Results:

  • Versican (PG-M) was identified as a proteoglycan that binds the growth factor midkine.
  • Syndecan-4 (ryudocan) was used to identify its binding proteins.

Conclusions:

  • Established experimental protocols for studying protein-proteoglycan interactions.
  • Demonstrated the utility of native proteoglycans in identifying specific binding partners.