Distribution of mechanical stress in the Escherichia coli cell envelope
Abstract
The cell envelope in Gram-negative bacteria comprises two distinct membranes with a cell wall between them. There has been a growing interest in understanding the mechanical adaptation of this cell envelope to the osmotic pressure (or turgor pressure), which is generated by the difference in the concentration of solutes between the cytoplasm and the external environment. However, it remains unexplored how the cell wall, the inner membrane (IM), and the outer membrane (OM) effectively protect the cell from this pressure by bearing the resulting surface tension, thus preventing the formation of inner membrane bulges, abnormal cell morphology, spheroplasts and cell lysis. In this study, we have used molecular dynamics (MD) simulations combined with experiments to resolve how and to what extent models of the IM, OM, and cell wall respond to changes in surface tension. We calculated the area compressibility modulus of all three components in simulations from tension-area isotherms. Experiments on monolayers mimicking individual leaflets of the IM and OM were also used to characterize their compressibility. While the membranes become softer as they expand, the cell wall exhibits significant strain stiffening at moderate to high tensions. We integrate these results into a model of the cell envelope inmore »
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1576681
- Alternate Identifier(s):
- OSTI ID: 1504012
- Grant/Contract Number:
- SC0014664; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- Biochimica et Biophysica Acta. Biomembranes
- Additional Journal Information:
- Journal Name: Biochimica et Biophysica Acta. Biomembranes Journal Volume: 1860 Journal Issue: 12; Journal ID: ISSN 0005-2736
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Membrane mechanics; Area compressibility; Turgor pressure; Bacterial cell wall; Lipopolysaccharides
Citation Formats
Hwang, Hyea, Paracini, Nicolò, Parks, Jerry M., Lakey, Jeremy H., and Gumbart, James C. Distribution of mechanical stress in the Escherichia coli cell envelope. Netherlands: N. p., 2018.
Web. doi:10.1016/j.bbamem.2018.09.020.
Hwang, Hyea, Paracini, Nicolò, Parks, Jerry M., Lakey, Jeremy H., & Gumbart, James C. Distribution of mechanical stress in the Escherichia coli cell envelope. Netherlands. https://doi.org/10.1016/j.bbamem.2018.09.020
Hwang, Hyea, Paracini, Nicolò, Parks, Jerry M., Lakey, Jeremy H., and Gumbart, James C. Sat .
"Distribution of mechanical stress in the Escherichia coli cell envelope". Netherlands. https://doi.org/10.1016/j.bbamem.2018.09.020.
@article{osti_1576681,
title = {Distribution of mechanical stress in the Escherichia coli cell envelope},
author = {Hwang, Hyea and Paracini, Nicolò and Parks, Jerry M. and Lakey, Jeremy H. and Gumbart, James C.},
abstractNote = {The cell envelope in Gram-negative bacteria comprises two distinct membranes with a cell wall between them. There has been a growing interest in understanding the mechanical adaptation of this cell envelope to the osmotic pressure (or turgor pressure), which is generated by the difference in the concentration of solutes between the cytoplasm and the external environment. However, it remains unexplored how the cell wall, the inner membrane (IM), and the outer membrane (OM) effectively protect the cell from this pressure by bearing the resulting surface tension, thus preventing the formation of inner membrane bulges, abnormal cell morphology, spheroplasts and cell lysis. In this study, we have used molecular dynamics (MD) simulations combined with experiments to resolve how and to what extent models of the IM, OM, and cell wall respond to changes in surface tension. We calculated the area compressibility modulus of all three components in simulations from tension-area isotherms. Experiments on monolayers mimicking individual leaflets of the IM and OM were also used to characterize their compressibility. While the membranes become softer as they expand, the cell wall exhibits significant strain stiffening at moderate to high tensions. We integrate these results into a model of the cell envelope in which the OM and cell wall share the tension at low turgor pressure (0.3 atm) but the tension in the cell wall dominates at high values (>1 atm).},
doi = {10.1016/j.bbamem.2018.09.020},
journal = {Biochimica et Biophysica Acta. Biomembranes},
number = 12,
volume = 1860,
place = {Netherlands},
year = {Sat Dec 01 00:00:00 EST 2018},
month = {Sat Dec 01 00:00:00 EST 2018}
}
https://doi.org/10.1016/j.bbamem.2018.09.020
Web of Science
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