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Updated: Jun 12, 2025
A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries
Published on: December 27, 2016
Pyrrolidine-2,3-diones: heterocyclic scaffolds that inhibit and eradicate S. aureus biofilms
M Alejandro Valdes-Pena1,2, Andrew Ratchford3,2, Minhua Nie1,2
1Department of Chemistry and Integrative Sciences Initiative, NC State University, Raleigh, NC, 27695, USA. jgpierce@ncsu.edu.
Abstract:
The absence of novel antibiotic classes, coupled with the rising threat of antibiotic persistence and resistance, is pushing the world perilously close to a new pre-antibiotic era. Over 35 000 people die every year in the US as a consequence of antimicrobial-resistant infections. Bacterial biofilms further complicate this scenario, as they are inherently more resistant to antibiotic treatments. Currently, there are no approved single agent or adjuvant small molecules for treating biofilm-complicated infections. Herein, we report the synthesis and microbiological evaluation of a novel library of 25+ monomeric and dimeric pyrrolidine-2,3-dione scaffolds. These compounds have displayed improved aqueous solubility, potent anti-biofilm properties, a low MBEC-to-MIC ratio, and synergism with FDA-approved antimicrobials against biofilm infections, constituting a promising technology as antimicrobial adjuvants.
Insights
A new class of pyrrolidine-2,3-dione compounds shows promise in combating antibiotic resistance and bacterial biofilms. These novel agents enhance existing antibiotics, offering hope against dangerous antimicrobial-resistant infections.
Area of Science:
- Medicinal Chemistry
- Microbiology
- Antimicrobial Resistance
Background:
- The world faces a critical threat from antibiotic resistance and persistence, nearing a pre-antibiotic era.
- Antimicrobial-resistant infections cause over 35,000 deaths annually in the US.
- Bacterial biofilms present a significant challenge due to their inherent resistance to antibiotics.
Purpose of the Study:
- To synthesize and evaluate a novel library of pyrrolidine-2,3-dione scaffolds as potential antimicrobial adjuvants.
- To address the lack of effective treatments for biofilm-complicated infections.
Main Methods:
- Synthesis of over 25 monomeric and dimeric pyrrolidine-2,3-dione compounds.
- Microbiological evaluation of compound efficacy against bacterial biofilms.
- Assessment of aqueous solubility, Minimum Biofilm Eradication Concentration (MBEC)-to-Minimum Inhibitory Concentration (MIC) ratio, and synergistic activity.
Main Results:
- The novel pyrrolidine-2,3-dione compounds exhibited improved aqueous solubility.
- Compounds demonstrated potent anti-biofilm properties and a low MBEC-to-MIC ratio.
- Significant synergism was observed when combined with FDA-approved antimicrobials against biofilm infections.
Conclusions:
- The developed pyrrolidine-2,3-dione scaffolds represent a promising new technology for antimicrobial adjuvants.
- These compounds offer a potential strategy to overcome antibiotic resistance and treat challenging biofilm infections.
