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Homodimeric Tobramycin Adjuvant Repurposes Novobiocin as an Effective Antibacterial Agent Against Gram-Negative Bacteria

Homodimeric Tobramycin Adjuvant Repurposes Novobiocin as an Effective Antibacterial Agent Against Gram-Negative Bacteria

Temilolu Idowu, Derek Ammeter, Heather Rossong, George G Zhanel, Frank Schweizer

J Med Chem. 2019 Oct 24;62(20):9103-9115.

PMID: 31557020

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP303811	Novobiocin		303-81-1	Price

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