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NH125 kills methicillin-resistant Staphylococcus aureus persisters by lipid bilayer disruption

Wooseong Kim1, Nico Fricke2, Annie L Conery3,4

  • 1Division of Infectious Diseases, Rhode Island Hospital, Alpert Medical School of Brown University, Providence, RI, USA.

Future Medicinal Chemistry
|February 25, 2016
PubMed
Abstract

Insights

NH125 effectively eliminates methicillin-resistant Staphylococcus aureus (MRSA) persisters by disrupting their cell membranes, similar to detergents. This action differs from WalR inhibitors, highlighting a novel mechanism for combating persistent bacterial infections.

Area of Science:

  • Microbiology
  • Bacterial Persistence
  • Antimicrobial Resistance

Background:

  • NH125 is a known WalK inhibitor that effectively kills MRSA persisters.
  • The precise mechanism of action for NH125 remained undetermined.

Purpose of the Study:

  • To elucidate the mode of action of NH125 in killing MRSA persisters.
  • To compare NH125's effects with known inhibitors and surfactants.

Main Methods:

  • Comparative analysis of antimicrobial activity spectrum.
  • Assessment of membrane permeability changes.
  • Investigation of effects on giant unilamellar vesicles (GUVs).

Main Results:

  • NH125 demonstrated efficacy against persister cells across various Staphylococcus aureus strains.
  • NH125 induced rapid membrane permeabilization and GUV rupture, akin to the cationic surfactant 16-BAC.
  • Walrycin B, a WalR inhibitor, did not exhibit these membrane-disrupting effects or kill persisters.

Conclusions:

  • NH125 eradicates MRSA persisters through a detergent-like interaction with and disruption of cell membranes.
  • The mechanism involves direct membrane damage, distinguishing it from WalR inhibition.
Keywords:
MRSANH125antibioticsgiant unilamellar vesicletwo-component system

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