[en] Fatty acid hydroperoxides (HPO) are free phyto-oxylipins known for their crucial role as signalling molecules during plant defense mechanisms. They were also demonstrated to have direct biocidal activities against plant pathogens including gram negative bacteria. In the present work, the biocidal effect of one linolenic fatty acid hydroperoxide, namely 13-HPOT has been investigated on three plant pathogen gram negative bacteria: Pectobacterium carotovorum, Pseudomonas syringae and Xanthomonas translucens. We showed that 13-HPOT has a strong dose response effect on those phytopathogens.
In a second part, the molecular mechanism behind the antibacterial effect of 13-HPOT was investigated at a molecular level using an integrative biophysical approach combining in vitro and in silico methods. Since other antimicrobial amphiphilic molecules have been shown to target the lipid membrane of the organisms they act on, we focused our study on the interaction of 13-HPOT with biomimetic membranes. In a first step, we hypothesized that the inner membrane of the bacteria was the main site of action of 13-HPOT and hence we used lipids representative of this membrane to form our models. Our results indicated that 13-HPOT can interact with the lipid representative of the inner bacterial plasma membrane. A strong membrane insertion is suggested but no major permeabilization of the membrane is observed. Phosphatidylethanolamine (PE) and cardiolipin (CL), present in the bacterial plasma membrane, appear to play important roles in this interaction. We suggest that the mode of action of 13-HPOT should involve either subtle changes in membrane properties, such as its lateral organization and distribution, and/or interactions
with membrane proteins.
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