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

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.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Idowu T,Ammeter D,Rossong H,Zhanel GG,Schweizer F

doi

10.1021/acs.jmedchem.9b00876

subject

Has Abstract

pub_date

2019-10-24 00:00:00

pages

9103-9115

issue

20

eissn

0022-2623

issn

1520-4804

journal_volume

62

pub_type

杂志文章

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