Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-020-15489-1
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Funding
- Excellence of Science-EOS programme [30550343]
- European Research Council under the European Union's Horizon 2020 research and innovation programme [693630]
- FNRS-WELBIO [WELBIO-CR-2015A-05, Welbio-CR-2015A-03]
- National Fund for Scientific Research (FNRS)
- Research Department of the Communaute francaise de Belgique (Concerted Research Action)
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The mechanical properties of the cell envelope in Gram-negative bacteria are controlled by the peptidoglycan, the outer membrane, and the proteins interacting with both layers. In Escherichia coli, the lipoprotein Lpp provides the only covalent crosslink between the outer membrane and the peptidoglycan. Here, we use single-cell atomic force microscopy and genetically engineered strains to study the contribution of Lpp to cell envelope mechanics. We show that Lpp contributes to cell envelope stiffness in two ways: by covalently connecting the outer membrane to the peptidoglycan, and by controlling the width of the periplasmic space. Furthermore, mutations affecting Lpp function substantially increase bacterial susceptibility to the antibiotic vancomycin, indicating that Lpp-dependent effects can affect antibacterial drug efficacy. Lipoprotein Lpp provides a covalent crosslink between the outer membrane and the peptidoglycan in E. coli. Here, the authors use atomic force microscopy to show that Lpp contributes to cell envelope stiffness by covalently connecting the two layers and by controlling the width of the periplasmic space.
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