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Title: Effect of Divalent Cation Removal on the Structure of Gram-Negative Bacterial Outer Membrane Models

Journal Article · · Langmuir
DOI: https://doi.org/10.1021/la504407v · OSTI ID:1213695
 [1];  [1];  [2];  [1];  [3];  [2];  [4]
  1. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Pulsed Neutron and Muon Source
  2. Australian Nuclear Science and Technology Organisation (ANSTO), Menai, NSW (Australia). Bragg Inst.
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Newcastle Univ. (United Kingdom). Inst. for Cell and Molecular Biosciences

The Gram-negative bacterial outer membrane (GNB-OM) is asymmetric in its lipid composition with a phospholipid-rich inner leaflet and an outer leaflet predominantly composed of lipopolysaccharides (LPS). LPS are polyanionic molecules, with numerous phosphate groups present in the lipid A and core oligosaccharide regions. The repulsive forces due to accumulation of the negative charges are screened and bridged by the divalent cations (Mg2+ and Ca2+) that are known to be crucial for the integrity of the bacterial OM. Indeed, chelation of divalent cations is a well-established method to permeabilize Gram-negative bacteria such as Escherichia coli. Here, we use X-ray and neutron reflectivity (XRR and NR, respectively) techniques to examine the role of calcium ions in the stability of a model GNB-OM. Using XRR we show that Ca2+ binds to the core region of the rough mutant LPS (RaLPS) films, producing more ordered structures in comparison to divalent cation free monolayers. Using recently developed solid-supported models of the GNB-OM, we study the effect of calcium removal on the asymmetry of DPPC:RaLPS bilayers. We show that without the charge screening effect of divalent cations, the LPS is forced to overcome the thermodynamically unfavorable energy barrier and flip across the hydrophobic bilayer to minimize the repulsive electrostatic forces, resulting in about 20% mixing of LPS and DPPC between the inner and outer bilayer leaflets. These results reveal for the first time the molecular details behind the well-known mechanism of outer membrane stabilization by divalent cations. This confirms the relevance of the asymmetric models for future studies of outer membrane stability and antibiotic penetration.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1213695
Journal Information:
Langmuir, Journal Name: Langmuir Journal Issue: 1 Vol. 31; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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On mechanisms of colicin import: the outer membrane quandary journal December 2018
Ions, metabolites, and cells: Water as a reporter of surface conditions during bacterial growth journal June 2018
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Inactivation of Escherichia Coli O157:H7 and Listeria Innocua by Benzoic Acid, Ethylenediaminetetraacetic Acid and Their Combination in Model Wash Water and Simulated Spinach Washing: Benzoic acid and EDTA as antimicrobial… journal February 2018
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Antibiotic Hybrids: the Next Generation of Agents and Adjuvants against Gram-Negative Pathogens? journal March 2018
Seven-transmembrane receptor protein RgsP and cell wall-binding protein RgsM promote unipolar growth in Rhizobiales journal August 2018
Design, antimicrobial activity and mechanism of action of Arg-rich ultra-short cationic lipopeptides journal February 2019
Potentiating the Activity of Nisin against Escherichia coli journal February 2016
Antimicrobial Peptides: An Emerging Category of Therapeutic Agents journal December 2016
Short Cationic Peptidomimetic Antimicrobials journal April 2019
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