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Genetic interaction mapping reveals functional relationships between peptidoglycan endopeptidases and carboxypeptidases
Department of Microbiology, Cornell University, NY, Ithaca, United States; Weill Institute for Cell and Molecular Biology, Cornell University, NY, Ithaca, United States.
Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).ORCID iD: 0000-0001-5995-718x
Department of Microbiology, Cornell University, NY, Ithaca, United States; Weill Institute for Cell and Molecular Biology, Cornell University, NY, Ithaca, United States; Cornell Institute for Host-Microbe Interactions and Disease (CIHMID), NY, Ithaca, United States.
2024 (English)In: PLOS Genetics, ISSN 1553-7390, E-ISSN 1553-7404, Vol. 20, no 4, article id e1011234Article in journal (Refereed) Published
Abstract [en]

Peptidoglycan (PG) is the main component of the bacterial cell wall; it maintains cell shape while protecting the cell from internal osmotic pressure and external environmental challenges. PG synthesis is essential for bacterial growth and survival, and a series of PG modifications are required to allow expansion of the sacculus. Endopeptidases (EPs), for example, cleave the crosslinks between adjacent PG strands to allow the incorporation of newly synthesized PG. EPs are collectively essential for bacterial growth and must likely be carefully regulated to prevent sacculus degradation and cell death. However, EP regulation mechanisms are poorly understood. Here, we used TnSeq to uncover novel EP regulators in Vibrio cholerae. This screen revealed that the carboxypeptidase DacA1 (PBP5) alleviates EP toxicity. dacA1 is essential for viability on LB medium, and this essentiality was suppressed by EP overexpression, revealing that EP toxicity both mitigates, and is mitigated by, a defect in dacA1. A subsequent suppressor screen to restore viability of ΔdacA1 in LB medium identified hypomorphic mutants in the PG synthesis pathway, as well as mutations that promote EP activation. Our data thus reveal a more complex role of DacA1 in maintaining PG homeostasis than previously assumed.

Place, publisher, year, edition, pages
Public Library of Science (PLoS), 2024. Vol. 20, no 4, article id e1011234
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Microbiology in the medical area
Identifiers
URN: urn:nbn:se:umu:diva-223634DOI: 10.1371/journal.pgen.1011234ISI: 001202796000002Scopus ID: 2-s2.0-85190343469OAI: oai:DiVA.org:umu-223634DiVA, id: diva2:1854354
Funder
Swedish Research CouncilNIH (National Institutes of Health), R01GM130971 (Knut and Alice Wallenberg FoundationThe Kempe FoundationsWenner-Gren FoundationsAvailable from: 2024-04-25 Created: 2024-04-25 Last updated: 2024-04-25Bibliographically approved

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Rey-Varela, DiegoCava, Felipe

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Molecular Infection Medicine Sweden (MIMS)Umeå Centre for Microbial Research (UCMR)Department of Molecular Biology (Faculty of Medicine)
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