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Nature. 2019 Oct 23. doi: 10.1038/s41586-019-1665-6. [Epub ahead of print]

Chimeric peptidomimetic antibiotics against Gram-negative bacteria.

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Polyphor AG, Allschwil, Switzerland.
Chemistry Department, University of Zurich, Zurich, Switzerland.
Biozentrum, University of Basel, Basel, Switzerland.
Institute of Molecular Systems Biology & Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.
Department of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland.
Chemistry Department, University of Zurich, Zurich, Switzerland.
Polyphor AG, Allschwil, Switzerland.


There is an urgent need for new antibiotics against Gram-negative pathogens that are resistant to carbapenem and third-generation cephalosporins, against which antibiotics of last resort have lost most of their efficacy. Here we describe a class of synthetic antibiotics inspired by scaffolds derived from natural products. These chimeric antibiotics contain a β-hairpin peptide macrocycle linked to the macrocycle found in the polymyxin and colistin family of natural products. They are bactericidal and have a mechanism of action that involves binding to both lipopolysaccharide and the main component (BamA) of the β-barrel folding complex (BAM) that is required for the folding and insertion of β-barrel proteins into the outer membrane of Gram-negative bacteria. Extensively optimized derivatives show potent activity against multidrug-resistant pathogens, including all of the Gram-negative members of the ESKAPE pathogens1. These derivatives also show favourable drug properties and overcome colistin resistance, both in vitro and in vivo. The lead candidate is currently in preclinical toxicology studies that-if successful-will allow progress into clinical studies that have the potential to address life-threatening infections by the Gram-negative pathogens, and thus to resolve a considerable unmet medical need.


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