Multivalent Glycopolymer Design Unlocks Antimicrobial Activity of 2-Deoxyglucose.

Area of Science:

• Chemical Biology
• Polymer Chemistry
• Antimicrobial Research

Background:

• The rise of multidrug-resistant (MDR) pathogens necessitates novel antimicrobial agents beyond current last-line therapies like cyclic peptides.
• Existing treatments are becoming insufficient against resistant bacterial strains, creating an urgent need for new classes of compounds with unique mechanisms.

Purpose of the Study:

• To develop a new class of antimicrobial compounds by chemically modifying a benign small molecule.
• To investigate the potential of glycan-derived polymers as effective antimicrobial agents against MDR bacteria.

Main Methods:

• Synthesized a 2-deoxyglucose (2DG) derivative suitable for ring opening metathesis polymerization (ROMP).
• Created a glycopolymer (poly2DG) displaying 2DG multivalently and evaluated the impact of linker length and polymerization degree.
• Tested the antimicrobial activity of poly2DG against a panel of MDR bacterial pathogens.

Main Results:

• The synthesized glycopolymer, poly2DG, demonstrated potent broad-spectrum antimicrobial activity.
• Optimal activity was achieved with shorter linkers and lower degrees of polymerization.
• Poly2DG showed significant efficacy against MDR strains including MRSA, Pseudomonas aeruginosa, and Acinetobacter baumannii, with MIC50 values as low as 0.2 µg/mL.
• Neither free 2DG nor the polymer scaffold alone exhibited antimicrobial effects, highlighting the importance of multivalent display.

Conclusions:

• Converting inert small molecules into potent antimicrobials via polymeric scaffolding is an effective strategy.
• This approach offers a straightforward method to develop novel materials that can circumvent multidrug resistance.
• Glycan-derived polymers represent a promising new avenue for antimicrobial drug discovery.