PreprintCited by 4Bacterial Genetics and BiotechnologyAntibiotic Resistance in BacteriaBiochemical and Structural Characterization

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Unraveling the prevalence and multifaceted roles of accessory peptide deformylases in bacterial adaptation and resistance

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Lambérioux, Morgan, Ducos-Galand, Magaly, Kaminski, Pierre-Alexandre, Littner, Eloi, Betton, Jean-Michel, Mechaly, Ariel, Haouz, Ahmed, Mazel, Didier·2025·Molecular Biology and Evolution

Preprint — published as 10.1093/molbev/msaf311

Abstract

Peptide deformylases (PDFs) are enzymes that are essential for bacterial viability and attractive targets for antibiotic development. Yet, despite their conserved function, many bacteria encode multiple PDFs, a genomic feature whose prevalence and implications remain largely unexplored. Here, we reveal that nearly half of all bacterial genomes carry more than one PDF gene, frequently embedded within mobile genetic elements such as plasmids and integrons. In Vibrio cholerae , the accessory PDF (Def2 VCH ) confers reduced susceptibility to actinonin (ACT), the most studied PDF inhibitor, while still supporting bacterial growth in absence of the canonical PDF copies (Def1 VCH ). Crystallographic analysis shows that this reduced susceptibility stems from an arginine-to-tyrosine substitution that probably reduces ACT binding. Strikingly, this resistance signature is shared by integron-encoded PDFs, and transfer of an integron-encoded PDF cassette from Pseudoxanthomonas into a susceptible V. cholerae is sufficient to abolish ACT susceptibility. These findings expose a cryptic reservoir of resistance within the bacterial mobilome and highlight a challenge to the therapeutic potential of PDF-targeting antibiotics: resistance may not only emerge, but is already encoded, mobile, and ready to spread.

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Metadata

Authors
Lambérioux, M., Ducos-Galand, M., Kaminski, P.-A., Littner, E., Betton, J.-M., Mechaly, A., Haouz, A., & Mazel, D.
Affiliations
  • Centre National de la Recherche Scientifique (FR)
  • Institut Pasteur, Université Paris Cité, Unité Plasticité du Génome Bactérien, CNRS UMR3525, Paris, France
  • Institut Pasteur (FR)
  • Institut Pasteur, Crystallography Platform-C2RT, CNRS-UMR 3528, Université Paris Cité, Paris, France
Corresponding author
Mazel, Didier
Venue
Molecular Biology and Evolution
Publisher
openRxiv
Published
2025-06-06
Volume
42
Issue
12
ISSN
0737-4038 (ISSN-L)
OpenAlex
W4416813535
Cited by
4
References
1
Citations by year
2026: 1 · 2025: 3
FWCI
2.35
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology and Evolution (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • HAL (submittedVersion, cc-by)
Funders
  • Pfizer
  • Fondation pour la Recherche Médicale
  • Centre National de la Recherche Scientifique
  • Institut Pasteur de Tunis
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Health Sciences › Medicine › Microbiology (medical) › Antibiotic Resistance in Bacteria
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Structural Characterization
Keywords
peptide deformylase, Vibrio cholerae, mobile genetic elements, Pseudoxanthomonas, bacterial adaptation
MeSH terms
Amidohydrolases, Bacterial Proteins, Vibrio cholerae, Drug Resistance, Bacterial, Integrons

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