防腐剂
肽
麦角甾醇
抗菌剂
抗菌肽
化学
磷脂酰乙醇胺
食品防腐剂
膜
抗真菌
生物物理学
酰胺
脂质双层
双层
生物化学
作者
Francisco Ramos‐Martín,Claudia Herrera‐León,Viviane Antonietti,Pascal Sonnet,Catherine Sarazin,Nicola D’Amelio
出处
期刊:Biochimie
[Elsevier]
日期:2022-12-01
卷期号:203: 51-64
被引量:6
标识
DOI:10.1016/j.biochi.2022.03.015
摘要
Sesquin is a wide spectrum antimicrobial peptide displaying a remarkable activity on fungi. Contrarily to most antimicrobial peptides, it presents an overall negative charge. In the present study, we elucidate the molecular basis of its mode of action towards biomimetic membranes by NMR and MD experiments. While a specific recognition of phosphatidylethanolamine (PE) might explain its activity in a variety of different organisms (including bacteria), a further interaction with ergosterol accounts for its strong antifungal activity. NMR data reveal a charge gradient along its amide protons allowing the peptide to reach the membrane phosphate groups despite its negative charge. Subsequently, the peptide gets structured inside the bilayer, reducing its order. MD simulations predict that its activity is retained in conditions commonly used for food preservation: low temperatures, high pressure, or the presence of electric field pulses, making Sesquin a good candidate as food preservative.
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