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Temperature-Switchable Glycopolymers and Their Conformation-Dependent Binding to Receptor Targets.

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Temperature affects how mannose-functionalized polymers bind to E. coli and ConA. The coil-to-globule transition influences binding differently, impacting bacterial adhesion and lectin interactions.

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Microbiology

Background:

  • Poly(N-isopropylacrylamide) (PNIPAM) is a thermoresponsive polymer.
  • Mannose ligands are crucial for interactions with specific bacteria and proteins.
  • Understanding temperature-dependent binding is key for designing targeted drug delivery systems.

Purpose of the Study:

  • To investigate the temperature-dependent binding of mannose-functionalized PNIPAM copolymers.
  • To determine how polymer structure and temperature affect binding to Escherichia coli and Concanavalin A (ConA).
  • To elucidate the mechanisms behind observed temperature effects on binding inhibition.

Main Methods:

  • Synthesis of glycopolymers with varying mannose densities using polymer analogous reactions.
  • Quantitative adhesion inhibition assays to measure binding efficacy.
  • Analysis of polymer behavior (coil-to-globule transition) above and below the lower critical solution temperature (LCST).

Main Results:

  • Glycopolymer binding to E. coli was stronger above the LCST, while ConA binding was weaker.
  • The coil-to-globule transition above the LCST led to surface-enriched mannose moieties, enhancing E. coli inhibition via steric shielding.
  • Above the LCST, some mannose ligands became inaccessible, reducing ConA binding due to polymer size changes.

Conclusions:

  • The coil-to-globule transition of glycopolymers has opposing effects on E. coli and ConA binding.
  • Steric shielding and ligand accessibility are critical factors determining inhibitory potential.
  • These findings offer insights into designing smart biomaterials for specific biological interactions.