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Stereochemical Control Yields Mucin Mimetic Polymers.

Austin G Kruger1, Spencer D Brucks1, Tao Yan1

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Scientists created synthetic mucin mimics to understand how mucus structure blocks microbial threats. Cis-polymers, mimicking mucus

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Area of Science:

  • Biomaterials Science
  • Glycobiology
  • Polymer Chemistry

Background:

  • Mucus, a hydrogel produced by most animals, is crucial for surface wetting, viscosity, and microbial defense.
  • Mucins, the main components of mucus, are high molecular weight O-glycoproteins with extended linear structures.
  • While glycosylation is key to mucin function, other structural features influencing biological activity remain unclear.

Purpose of the Study:

  • To investigate the role of mucin's extended conformation in blocking microbial virulence phenotypes.
  • To develop synthetic mucin mimics that replicate the dense glycan display and morphology of natural mucins.

Main Methods:

  • Synthesized substituted norbornene-derived glycopolymers using ring-opening metathesis polymerization (ROMP) with varied catalysts.
  • Generated cis- and trans-alkene containing glycopolymers to mimic mucin's linear or non-linear structures.
  • Utilized atomic force microscopy (AFM) to compare polymer and native mucin (Muc2, Muc5AC, Muc5B) structures.

Main Results:

  • Cis-glycopolymers adopted extended, linear structures similar to native mucins, confirmed by AFM.
  • Cis-polymers demonstrated enhanced water solubility and maintained their structure in solution compared to trans-analogs.
  • Cis-glycopolymers showed more potent binding to cholera toxin, a bacterial virulence factor, aligning with mucin's morphology.

Conclusions:

  • The extended polymer backbone is critical for designing effective mucin surrogates.
  • Mucin's linear conformation is significant for its ability to inhibit bacterial virulence factors.
  • This study provides insights into structure-activity relationships for mucin-based biomaterials.