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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.
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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.
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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.
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Recent advances in cellular glycomic analyses.

Jun-Ichi Furukawa1, Naoki Fujitani1, Yasuro Shinohara2

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Cell surface glycans (glycomes) are vital for cellular functions and alterations. Recent analytical advances clarify cellular glycomic profiles, aiding biomarker discovery for stem cells and cancer.

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Area of Science:

  • Glycomics and glycobiology
  • Cellular biology
  • Biomarker discovery

Background:

  • Cell surface glycans (glycomes) play critical roles in cell adhesion, immune response, and pathogenesis.
  • Glycomic profiles reflect cellular states like development, differentiation, and cancer.
  • Understanding cellular glycomes is key for discovering novel biomarkers.

Purpose of the Study:

  • To review recent technical advances in cellular glycomic analysis.
  • To highlight methodologies for analyzing major glycoconjugate classes.
  • To discuss glycomics in biologically important cells.

Main Methods:

  • Focus on technical aspects of glycomic analysis.
  • Analysis of N- and O-linked glycans from glycoproteins, proteoglycans, and glycosphingolipids.
  • Review of studies on stem cells and cancer cells.

Main Results:

  • Progress in analytical methodologies is clarifying cellular glycomics.
  • Diverse cellular glycomes can now be analyzed more effectively.
  • Recent studies reveal glycomic insights into various cell types.

Conclusions:

  • Advances in analytical techniques are crucial for understanding cellular glycomics.
  • Glycoconjugate-based approaches show promise for biomarker discovery.
  • Further research on cellular glycomics will impact stem cell and cancer biology.