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Nutrient Limitation Sensitizes

Derek C K Chan1, Katherine Dykema1, Mahrukh Fatima1

  • 1David Braley Center for Antibiotic Discovery, Michael G. DeGroote Institute for Infectious Disease Research, Department of Biochemistry and Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada.

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Screening antibiotics in nutrient-limited conditions revealed vancomycin

Keywords:
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Area of Science:

  • Microbiology
  • Antibiotic Resistance
  • Bacterial Pathogenesis

Background:

  • Standard antibacterial screening methods use nutrient-rich conditions, not reflecting natural environments or infection sites.
  • Physiologically relevant screening conditions may uncover new antibiotic activities.
  • Pseudomonas aeruginosa is an opportunistic Gram-negative bacterium.

Purpose of the Study:

  • To screen antibiotics with reported inactivity against Pseudomonas aeruginosa under low-nutrient and low-iron conditions.
  • To identify novel antibiotic activities and understand emerging resistance mechanisms.

Main Methods:

  • Screening of antibiotics against Pseudomonas aeruginosa under low-nutrient and low-iron conditions.
  • Analysis of vancomycin resistance mechanisms, including genetic mutations and their impact on cellular processes.
  • Characterization of lipopolysaccharide (LPS) profiles and bacteriophage susceptibility in resistant mutants.

Main Results:

  • Vancomycin demonstrated inhibitory activity against Pseudomonas aeruginosa at low micromolar concentrations via peptidoglycan crosslinking disruption.
  • Vancomycin resistance arose from mutations in the CpxSR two-component system, conferring cross-resistance to β-lactams and cefiderocol.
  • Mutations in WapR, an LPS biosynthesis enzyme, also conferred vancomycin resistance and altered LPS structure, increasing phage susceptibility.

Conclusions:

  • Screening under nutrient-limited conditions can identify novel activities for existing antibiotics like vancomycin against Gram-negative bacteria.
  • Discovering new resistance mechanisms, such as those involving CpxSR and WapR, is crucial for understanding antibiotic efficacy.
  • This approach highlights the potential for finding new therapeutic strategies by mimicking real-world bacterial environments.