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Kibdelomycin is a bactericidal broad-spectrum aerobic antibacterial agent
Sheo B Singh1, Priya Dayananth2, Carl J Balibar2
1Merck Research Laboratories, Kenilworth, New Jersey, USA sheo.singh.215@gmail.com.
Antimicrobial Agents and Chemotherapy
|April 8, 2015
Summary
Kibdelomycin, a novel antibiotic, shows potent activity against Gram-positive bacteria and Acinetobacter baumannii. Further research into its chemical modification may overcome resistance mechanisms in Gram-negative pathogens.
Area of Science:
- Microbiology
- Antibiotic Discovery
- Drug Resistance
Background:
- Antibiotic resistance is a growing global health threat, coupled with a declining rate of new antibiotic discovery.
- Kibdelomycin is a natural-product antibiotic that targets bacterial DNA replication enzymes, DNA gyrase and topoisomerase IV.
- Previous studies identified kibdelomycin as a broad-spectrum Gram-positive agent with selective activity against Clostridium difficile.
Purpose of the Study:
- To expand the antimicrobial profiling of kibdelomycin against a diverse collection of clinical bacterial pathogens.
- To evaluate the activity of kibdelomycin against Gram-negative aerobic pathogens, including Acinetobacter baumannii and Pseudomonas aeruginosa.
- To investigate potential mechanisms of resistance and susceptibility, including cross-resistance, efflux, and outer membrane permeability.
Main Methods:
- Antimicrobial susceptibility testing (MIC50, MIC90, bactericidal activity) was performed on over 196 clinical isolates.
- Resistant strains of Staphylococcus aureus and Streptococcus pneumoniae were used to assess cross-resistance with existing antibiotics.
- Efflux pump activity and outer membrane permeability were investigated in relevant bacterial species.
Main Results:
- Kibdelomycin confirmed its broad-spectrum activity against Gram-positive bacteria.
- Strong activity (MIC90, 0.125 μg/ml) was observed against clinical strains of Acinetobacter baumannii.
- Weak activity was noted against Pseudomonas aeruginosa, with varying susceptibility influenced by efflux and outer membrane permeability.
Conclusions:
- Kibdelomycin demonstrates significant potential as a therapeutic agent, particularly against Gram-positive pathogens and Acinetobacter baumannii.
- The study highlights the potential for structure-based chemical modification to enhance kibdelomycin's efficacy against Gram-negative bacteria.
- Understanding resistance mechanisms like efflux and outer membrane penetration is crucial for optimizing kibdelomycin's clinical application.
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