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Stress-induced Antibiotic Susceptibility Testing on a Chip
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Statin-induced lipid carrier stress reveals a conserved vulnerability in β-lactam-resistant Gram-positive bacteria

Gabriel Torrens1, Sean W Bisset1, Maria López-Bravo2

  • 1Department of Molecular Biology, Umeå University, Umeå, Sweden.

Nature Communications
|July 20, 2026
PubMed

Insights

New research reveals how bacteria like MRSA develop resistance to antibiotics. Mutations in a specific gene, gdpP, allow bacteria to regain resistance when statins disrupt their membranes, offering new targets for drug development.

Area of Science:

  • Microbiology
  • Drug Discovery
  • Molecular Biology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) employs penicillin-binding protein 2a (PBP2a) within membrane microdomains to resist beta-lactam antibiotics.
  • Statins can resensitize MRSA to beta-lactams by disrupting these microdomains and PBP2a oligomerization.
  • The mechanisms by which bacteria develop resistance to statin-mediated resensitization are not fully understood.

Purpose of the Study:

  • To elucidate the mechanisms of resistance to statin-mediated resensitization in MRSA.
  • To identify genetic adaptations that restore oxacillin resistance during membrane microdomain disruption.
  • To explore potential conserved vulnerabilities in Gram-positive pathogens.

Main Methods:

  • Conducted evolution experiments with MRSA strains lacking a functional staphyloxanthin pathway.
  • Utilized simvastatin to investigate its effect on resistance acquisition.
  • Employed genetic analysis to identify mutations conferring resistance.
  • Investigated the role of cyclic di-adenosine monophosphate (c-di-AMP) signaling.
  • Assessed the impact of mevalonate pathway inhibition and lipid carrier depletion.
  • Tested the vulnerability in Streptococcus pneumoniae.

Main Results:

  • Mutations in gdpP, a regulator of cyclic di-adenosine monophosphate (c-di-AMP) signaling, were the primary mechanism for restoring oxacillin resistance.
  • Simvastatin treatment blocked this adaptation, indicating a synthetic lethal interaction.
  • Simvastatin's inhibition of the mevalonate pathway depleted undecaprenyl phosphate, causing peptidoglycan precursor imbalance.
  • This imbalance effect was mimicked by bacitracin, a lipid carrier-targeting antibiotic.
  • Compensatory mutations conferring resistance resulted in a fitness cost in vivo.
  • The identified vulnerability was conserved in Streptococcus pneumoniae.

Conclusions:

  • Bacterial adaptation to statin-induced membrane disruption predominantly occurs through mutations in gdpP, affecting c-di-AMP signaling.
  • Simvastatin reveals a synthetic lethal interaction by targeting the mevalonate pathway, leading to essential lipid depletion and peptidoglycan precursor imbalance.
  • This conserved vulnerability in Gram-positive pathogens, including S. pneumoniae, offers a potential strategy to overcome beta-lactam resistance.

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