Penetration through Outer Membrane and Efflux Potential in Pseudomonas aeruginosa of Bulgecin A as an Adjuvant to β-Lactam Antibiotics

Choon Kim, Shusuke Tomoshige, Mijoon Lee, Helen I. Zgurskaya, Shahriar Mobashery

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The treatment of infections by Gram-negative bacteria remains a difficult clinical challenge. In the light of the dearth of discovery of novel antibiotics, one strategy that is being explored is the use of adjuvants to enhance antibacterial activities of existing antibiotics. One such adjuvant is bulgecin A, which allows for the lowering of minimal-inhibitory concentrations for β-lactam antibiotics. We have shown that bulgecin A inhibits three of the pseudomonal lytic transglycosylases in its mode of action, yet high concentrations are needed for potentiation activity. Herein, we document that bulgecin A is not a substrate for pseudomonal efflux pumps, whose functions could have been a culprit in the need for high concentrations. We present evidence that the penetration barrier into the periplasm is at the root of the need for high concentrations of bulgecin A in its potentiation of β-lactam antibiotics.

Original languageEnglish
Article number358
JournalAntibiotics
Volume12
Issue number2
DOIs
Publication statusPublished - 2023 Feb

Keywords

  • Pseudomonas aeruginosa
  • bulgecin A
  • efflux pumps
  • outer membrane penetration
  • porins
  • potentiation
  • β-lactam antibiotics

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