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Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
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New LsrK Ligands as AI-2 Quorum Sensing Interfering Compounds against Biofilm Formation
Giorgio Milli1, Angelica Pellegrini2, Roberta Listro1
1Department of Drug Sciences, University of Pavia, Viale Taramelli 12, Pavia 27100, Italy.
Journal of Medicinal Chemistry
|October 9, 2024
Summary
Novel compounds targeting bacterial quorum sensing (QS) effectively inhibit biofilm formation in key pathogens. These agents offer a promising strategy against antimicrobial resistance (AMR) and biofilm-associated infections.
Area of Science:
- Microbiology
- Medicinal Chemistry
- Biochemistry
Background:
- Antimicrobial resistance (AMR) is a global health threat.
- Biofilm formation and bacterial quorum sensing (QS) are crucial for persistent infections.
- Targeting QS pathways offers a novel strategy against AMR.
Purpose of the Study:
- To design and evaluate novel autoinducer-2 (AI-2)-inspired compounds.
- To assess the antibiofilm activity of these compounds against *Staphylococcus aureus* and *Pseudomonas aeruginosa*.
- To investigate the mechanism of action, focusing on AI-2 QS inhibition.
Main Methods:
- Synthesis of AI-2-inspired compounds.
- Evaluation of antibiofilm activity and minimal inhibitory concentrations (MICs).
- Spectroscopic techniques (DSF, fluorescence, CD, NMR) to study compound-enzyme interactions.
Main Results:
- Compounds 5d, 5e, and 7b showed potent antibiofilm activity (low µg/mL MICs).
- Inhibition of biofilm formation was primarily due to AI-2 QS inhibition, not direct antimicrobial effects.
- Binding of compounds to the LsrK enzyme, a key component of AI-2 QS, was confirmed.
Conclusions:
- Novel AI-2 QS inhibitors demonstrate significant potential against biofilm-associated infections.
- These compounds represent a promising therapeutic avenue for combating AMR.
- Targeting bacterial communication pathways is an effective anti-AMR strategy.
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