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Oligosaccharide Assembly01:24

Oligosaccharide Assembly

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...
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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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Proteoglycans01:05

Proteoglycans

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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Glycocalyx and its Functions

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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Peptidoglycan Synthesis01:28

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Selectins01:25

Selectins

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Sequence-defined glycopolymer segments presenting mannose: synthesis and lectin binding affinity.

Daniela Ponader1, Felix Wojcik, Figen Beceren-Braun

  • 1MPI of Colloids and Interfaces, Potsdam-Golm, Germany.

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Summary

Researchers synthesized sequence-defined glycopolymer segments using solid-phase polymer synthesis. These novel glycopolymers show increased binding affinity to lectins based on sugar presentation, enabling systematic study of multivalent interactions.

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Area of Science:

  • Polymer Chemistry
  • Carbohydrate Chemistry
  • Bioconjugation

Background:

  • Developing synthetic glycopolymers with controlled structures is crucial for understanding carbohydrate-protein interactions.
  • Solid-phase synthesis offers a platform for creating well-defined polymeric architectures.

Purpose of the Study:

  • To develop a method for synthesizing sequence-defined, monodisperse glycopolymer segments.
  • To investigate the impact of glycopolymer structure, specifically ligand number and spacing, on lectin binding affinity.

Main Methods:

  • Solid-phase polymer synthesis using functional building blocks with alkyne and hydrophilic units.
  • Conjugation of mannose sugars via 1,3-dipolar cycloaddition.
  • Surface plasmon resonance (SPR) and Concanavalin A (Con A) lectin binding assays.

Main Results:

  • Successful synthesis of sequence-defined glycopolymer segments with varying mannose valencies (mono-, di-, trivalent).
  • SPR studies revealed a nonlinear increase in Con A lectin binding with increased sugar ligand number and optimized spacing.
  • Binding affinity is significantly influenced by the polymeric scaffold's chemical composition, ligand spacing, and the number of mannose units.

Conclusions:

  • Solid-phase synthesis enables the creation of precisely defined glycooligomers and glycopolymers.
  • This methodology allows for systematic investigation of multivalent effects in ligand-receptor interactions.
  • The findings provide a foundation for designing advanced glycomaterials with tailored binding properties.