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Targeting the FtsH protease unmasks a universal vulnerability to antimicrobial peptoids

Zin Mie Mie Tun1, Kristian Sørensen1, Ella Moore1

  • 1Department of Bioengineering, School of Medicine & School of Engineering, Stanford University, Stanford, CA, 94305, United States.

International Journal of Biological Macromolecules
|July 3, 2026
PubMed

Insights

New synthetic peptoids combat multidrug-resistant bacteria by causing protein aggregation. The FtsH protease is key to bacterial defense, and inhibiting it, especially in low-energy persister cells, offers a potent strategy against infections.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Drug Discovery

Background:

  • Multidrug-resistant (MDR) bacteria necessitate novel antimicrobial agents.
  • Synthetic peptoids offer a new therapeutic avenue, targeting intracellular processes rather than membranes.
  • Understanding bacterial defense mechanisms against peptoids is crucial for developing effective treatments.

Purpose of the Study:

  • To elucidate the bacterial defense mechanisms against synthetic peptoid-induced proteotoxic stress.
  • To identify key bacterial vulnerabilities for combination therapy development.
  • To explore strategies for overcoming antibiotic tolerance in persister cells.

Main Methods:

  • Investigated bacterial survival under peptoid stress by analyzing gene knockouts, specifically targeting the FtsH protease.
  • Assessed the role of bacterial energy metabolism in FtsH activity and susceptibility to peptoids.
  • Evaluated combination therapies involving peptoids with FtsH inhibitors or energy-depleting compounds.

Main Results:

  • FtsH was identified as the primary bacterial defense mechanism against peptoid-induced proteotoxic stress, with its absence causing significant sensitization.
  • FtsH's protective function is dependent on bacterial energy metabolism, being less active in low-energy persister cells.
  • Disabling FtsH in Pseudomonas aeruginosa increased susceptibility, indicating a conserved vulnerability across peptoid scaffolds.
  • Persister cells exhibit heightened susceptibility to peptoids due to metabolically repressed FtsH.
  • Combination therapy of peptoid (TM5) with an FtsH inhibitor or energy-depleting agent proved highly effective against persister cells.

Conclusions:

  • FtsH is a critical bottleneck for bacterial survival under peptoid-induced proteotoxic stress.
  • The metabolic regulation of FtsH renders antibiotic-tolerant persister cells uniquely vulnerable to peptoids.
  • Targeting FtsH in combination with peptoids presents a promising strategy to overcome MDR bacterial infections and persister cell tolerance.
Keywords:
Antimicrobial PeptoidsBacterial persistenceFtsH proteaseProteostasisSynergistic therapy

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