Dual Escherichia coli DNA Gyrase A and B Inhibitors with Antibacterial Activity

Benedetta Fois, Žiga Skok, Tihomir Tomašič, Janez Ilaš, Nace Zidar, Anamarija Zega, Lucija Peterlin Mašič, Petra Szili, Gábor Draskovits, Ákos Nyerges, Csaba Pál, Danijel Kikelj

Research output: Contribution to journalArticle


The emergence of multidrug-resistant bacteria is a global health threat necessitating the discovery of new antibacterials and novel strategies for fighting bacterial infections. We report first-in-class DNA gyrase B (GyrB) inhibitor/ciprofloxacin hybrids that display antibacterial activity against Escherichia coli. Whereas DNA gyrase ATPase inhibition experiments, DNA gyrase supercoiling assays, and in vitro antibacterial assays suggest binding of the hybrids to the E. coli GyrA and GyrB subunits, an interaction with the GyrA fluoroquinolone-binding site seems to be solely responsible for their antibacterial activity. Our results provide a foundation for a new concept of facilitating entry of nonpermeating GyrB inhibitors into bacteria by conjugation with ciprofloxacin, a highly permeable GyrA inhibitor. A hybrid molecule containing GyrA and GyrB inhibitor parts entering the bacterial cell would then elicit a strong antibacterial effect by inhibition of both the GyrA and GyrB subunits of DNA gyrase and potentially slow bacterial resistance development.

Original languageEnglish
Publication statusAccepted/In press - Jan 1 2019


  • antibiotics
  • ciprofloxacin
  • drug discovery
  • dual inhibitors
  • gyrase A
  • gyrase B
  • hybrids

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Pharmacology
  • Drug Discovery
  • Pharmacology, Toxicology and Pharmaceutics(all)
  • Organic Chemistry

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    Fois, B., Skok, Ž., Tomašič, T., Ilaš, J., Zidar, N., Zega, A., Peterlin Mašič, L., Szili, P., Draskovits, G., Nyerges, Á., Pál, C., & Kikelj, D. (Accepted/In press). Dual Escherichia coli DNA Gyrase A and B Inhibitors with Antibacterial Activity. ChemMedChem. https://doi.org/10.1002/cmdc.201900607