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Synthesis and antibiotic activity of oxazolidinone-catechol conjugates against Pseudomonas aeruginosa

Aurélie Paulen1, Véronique Gasser1, Françoise Hoegy1

  • 1Equipe Transport Membranaire Bactérien, Biotechnologie et Signalisation Cellulaire, UMR7242 Université de Strasbourg-CNRS, Pole API, 300 boulevard Sébastien Brant, CS10413, 67412 Illkirch Cedex, France. mislin@unistra.fr.

Organic & Biomolecular Chemistry
|October 29, 2015
PubMed

Insights

New oxazolidinone-catechol conjugates show enhanced activity against Pseudomonas aeruginosa infections. This development offers a promising strategy against Gram-negative bacterial resistance, potentially utilizing bacterial iron uptake systems.

Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Pseudomonas aeruginosa is a Gram-negative bacterium causing severe infections with increasing antibiotic resistance.
  • Oxazolidinone antibiotics are effective against Gram-positive bacteria but show limited activity against Gram-negative pathogens like P. aeruginosa.
  • Existing treatments face challenges due to widespread antimicrobial resistance.

Purpose of the Study:

  • To synthesize novel conjugates combining catechol moieties with oxazolidinone antibiotics.
  • To evaluate the efficacy of these conjugates against Pseudomonas aeruginosa.
  • To explore the potential role of bacterial iron uptake systems in the observed antimicrobial activity.

Main Methods:

  • Chemical synthesis of catechol-oxazolidinone conjugates.
  • Determination of Minimum Inhibitory Concentrations (MICs) against P. aeruginosa.
  • Comparative analysis of conjugate activity versus linezolid (reference oxazolidinone).
  • Assessment of antibiotic activity in iron-depleted media.

Main Results:

  • The synthesized catechol-oxazolidinone conjugates demonstrated significantly enhanced activity against P. aeruginosa (MICs 218-1024 μM) compared to linezolid (MIC > 1024 μM).
  • A slight increase in antibiotic activity was observed in iron-depleted medium, suggesting involvement of bacterial iron transport.
  • The enterobactin transporter PfeA was excluded as a contributing factor in the iron-mediated uptake pathway.

Conclusions:

  • Catechol conjugation represents a viable strategy to enhance oxazolidinone activity against Gram-negative bacteria like P. aeruginosa.
  • The findings suggest that bacterial iron uptake systems may play a role in the enhanced efficacy of these novel conjugates.
  • Further research is warranted to elucidate the precise iron uptake pathway involved and optimize these compounds for therapeutic use.

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