Homodimeric Tobramycin Adjuvant Repurposes Novobiocin as an Effective Antibacterial Agent against Gram-Negative Bacteria.
Temilolu IdowuDerek AmmeterHeather RossongGeorge G ZhanelFrank SchweizerPublished in: Journal of medicinal chemistry (2019)
Low permeability across the outer membrane is a major reason why most antibiotics are ineffective against Gram-negative bacteria. Agents that permeabilize the outer membrane are typically toxic at their effective concentrations. Here, we report the development of a broad-spectrum homodimeric tobramycin adjuvant that is nontoxic and more potent than the gold standard permeabilizing agent, polymyxin B nonapeptide. In pilot studies, the adjuvant confers potent bactericidal activity on novobiocin against Gram-negative bacteria, including carbapenem-resistant and colistin-resistant strains bearing plasmid-borne mcr-1 genes. Resistance development to the combination was significantly reduced, relative to novobiocin alone, and there was no induction of cross-resistance to other antibiotics, including the gyrase-acting fluoroquinolones. Tobramycin homodimer may allow the use of lower doses of novobiocin, overcoming its twin problem of efficacy and toxicity.
Keyphrases
- escherichia coli
- early stage
- multidrug resistant
- klebsiella pneumoniae
- anti inflammatory
- gram negative
- oxidative stress
- drug resistant
- pseudomonas aeruginosa
- crispr cas
- silver nanoparticles
- endothelial cells
- acinetobacter baumannii
- clinical trial
- genome wide
- gene expression
- transcription factor
- genome wide identification