DOI > 10.5291/ILL-DATA.8-02-669

This proposal is publicly available since 03/08/2018

Title

Biomimetic models of the outer membrane of Gram-negative bacteria and their interaction with two complementary antimicrobial peptides.

Abstract

Resurgence of bacterial resistance to antibiotics has become a major public health issue. Antimicrobial peptides are very promising molecules for the development of new anti-infective therapies. However, their mechanisms of action on bacterial membranes are still poorly understood. My project aims to develop innovative models of membranes, imitating both the structure and the composition of the membranes of Gram-negative bacteria, and allowing the screening of potentially active antimicrobial peptides and the elucidation of their mechanism of action. Two new antimicrobial peptides belonging to the family of plasticins, one active and the other inactive, will be used as model drugs. Their interaction with pure symmetric PL/PL and asymmetrical LPS/PL floating and adsorbed bilayers will be studied by neutron reflectommetry in order to examine both the physical state and the symmetrical/asymmetrical organization of the membrane, as well as the influence of concentration and aggregation state of plasticins penetrating into it.

Experimental Report

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Data Citation

The recommended format for citing this dataset in a research publication is in the following format:

MICHEL Jean Philippe; FRAGNETO Giovanna; GERELLI YURI; GUTFREUND Philipp and ROSILIO Veronique. (2013). Biomimetic models of the outer membrane of Gram-negative bacteria and their interaction with two complementary antimicrobial peptides.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.8-02-669

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Metadata

Experiment Parameters

  • Environment temperature

    20-40C
  • Experiment energy

    2-20 Å
  • Experiment moment

    0.008-0.25Å-1
  • Experiment res energy

    2-5%
  • Experiment res moment

    2-5%

Sample Parameters

  • Formula

    • 1-stearoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine C41H80NO8P
    • chloroform CHCl3
    • methanol CH4O
    • Lipopolysaccharides from Salmonella minnesota Re 595 (Re mutant not toxic)
    • peptide PTCDA1 sequence GVVTDLLNTAGGLLGNLVGSLSG-NH2
    • peptide PTCDA1-KF sequence GVVTDLLKTAGKLLGNLFGSLSG-NH2
    • buffer 100 mM PBS Na2HPO4/NaH2PO4 pH7 + 150 mM NaCl
    • 1-stearoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) C42H80O10PNa
    • 1',3'-bis[1,2-dioleoyl-sn-glycero-3-phospho]-sn-glycerol C81H148O17P2Na2
  • Consistence

    liquid