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Updated: May 20, 2026
08:06
The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions
Published on: February 1, 2018
Zwitterionic Penicillin-Derived Sulfone Inhibitor for Combating β-Lactamase-Mediated Antibiotic Resistance
Diana Rodríguez1, Emilio Lence1, Juan C Vázquez-Ucha2
1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
Chemmedchem
|May 18, 2026
Summary
A novel zwitterionic compound, compound 3, effectively restores β-lactam antibiotic activity against resistant bacteria by inhibiting β-lactamase enzymes. This breakthrough offers a promising strategy against multidrug-resistant pathogens.
Area of Science:
- Medicinal Chemistry
- Microbiology
- Drug Discovery
Background:
- β-Lactam antibiotics are crucial for treating bacterial infections but face resistance from β-lactamase enzymes.
- Emergence of β-lactamase-mediated resistance compromises the efficacy of essential antibiotics, including carbapenems.
- Developing new inhibitors is critical to preserve the effectiveness of last-resort antibiotics against multidrug-resistant (MDR) pathogens.
Purpose of the Study:
- To design and synthesize a novel zwitterionic penicillin-derived sulfone (compound 3) as a potent β-lactamase inhibitor.
- To evaluate the ability of compound 3 to restore the activity of β-lactam antibiotics against MDR bacteria.
- To elucidate the mechanism of action of compound 3 against key β-lactamase enzymes.
Main Methods:
- Synthesis of zwitterionic penicillin-derived sulfone (compound 3).
- In vitro assays to assess the restoration of β-lactam activity against MDR pathogens producing ESBLs and carbapenemases.
- Kinetic analysis with isolated OXA-48 and PDC-1 enzymes.
- Mechanistic studies using mass spectrometry and molecular dynamics simulations.
Main Results:
- Compound 3 significantly restored β-lactam activity against MDR pathogens producing extended-spectrum β-lactamases (ESBLs) and carbapenem-hydrolyzing class D β-lactamases.
- It enhanced the efficacy of imipenem and ceftazidime against strains expressing OXA-48 and PDC-1.
- Mechanistic studies revealed a covalent inactivation pathway via indolizine adduct formation, with compound 3's structure influencing enzyme binding and permeability.
Conclusions:
- Compound 3 demonstrates significant potential as a next-generation β-lactamase inhibitor.
- It offers a promising therapeutic strategy against infections caused by ESBL- and carbapenemase-producing bacteria.
- The design principles of compound 3 can guide the development of future antimicrobial agents to combat resistance.
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