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Title: Interaction of the Antimicrobial Peptide Aurein 1.2 and Charged Lipid Bilayer

Abstract

Aurein 1.2 is a potent antimicrobial peptide secreted by frog Litoria aurea. As a short membrane-active peptide with only 13 amino acids in sequence, it has been found to be residing on the surface of lipid bilayer and permeabilizing bacterial membranes at high concentration. However, the detail at the molecular level is largely unknown. Here in this study, we investigated the action of Aurein 1.2 in charged lipid bilayers composed of DMPC/DMPG. Oriented Circular Dichroism results showed that the peptide was on the surface of lipid bilayer regardless of the charged lipid ratio. Only at a very high peptide-to-lipid ratio (~1/10), the peptide became perpendicular to the bilayer, however no pore was detected by neutron in-plane scattering. To further understand how it interacted with charged lipid bilayers, we employed Small Angle Neutron Scattering to probe lipid distribution across bilayer leaflets in lipid vesicles. The results showed that Aurein 1.2 interacted strongly with negatively charged DMPG, causing strong asymmetry in lipid bilayer. At high concentration, while the vesicles were intact, we found additional structure feature on the bilayer. Finally, our study provides a glimpse into how Aurein 1.2 disturbs anionic lipid-containing membranes without pore formation.

Authors:
 [1]; ORCiD logo [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology & Soft Matter Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology & Soft Matter Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Structural Molecular Biology (CSMB)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Structural Molecular Biology (CSMB)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1364315
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 60 APPLIED LIFE SCIENCES

Citation Formats

Rai, Durgesh K., and Qian, Shuo. Interaction of the Antimicrobial Peptide Aurein 1.2 and Charged Lipid Bilayer. United States: N. p., 2017. Web. doi:10.1038/s41598-017-03795-6.
Rai, Durgesh K., & Qian, Shuo. Interaction of the Antimicrobial Peptide Aurein 1.2 and Charged Lipid Bilayer. United States. doi:10.1038/s41598-017-03795-6.
Rai, Durgesh K., and Qian, Shuo. Fri . "Interaction of the Antimicrobial Peptide Aurein 1.2 and Charged Lipid Bilayer". United States. doi:10.1038/s41598-017-03795-6. https://www.osti.gov/servlets/purl/1364315.
@article{osti_1364315,
title = {Interaction of the Antimicrobial Peptide Aurein 1.2 and Charged Lipid Bilayer},
author = {Rai, Durgesh K. and Qian, Shuo},
abstractNote = {Aurein 1.2 is a potent antimicrobial peptide secreted by frog Litoria aurea. As a short membrane-active peptide with only 13 amino acids in sequence, it has been found to be residing on the surface of lipid bilayer and permeabilizing bacterial membranes at high concentration. However, the detail at the molecular level is largely unknown. Here in this study, we investigated the action of Aurein 1.2 in charged lipid bilayers composed of DMPC/DMPG. Oriented Circular Dichroism results showed that the peptide was on the surface of lipid bilayer regardless of the charged lipid ratio. Only at a very high peptide-to-lipid ratio (~1/10), the peptide became perpendicular to the bilayer, however no pore was detected by neutron in-plane scattering. To further understand how it interacted with charged lipid bilayers, we employed Small Angle Neutron Scattering to probe lipid distribution across bilayer leaflets in lipid vesicles. The results showed that Aurein 1.2 interacted strongly with negatively charged DMPG, causing strong asymmetry in lipid bilayer. At high concentration, while the vesicles were intact, we found additional structure feature on the bilayer. Finally, our study provides a glimpse into how Aurein 1.2 disturbs anionic lipid-containing membranes without pore formation.},
doi = {10.1038/s41598-017-03795-6},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {Fri Jun 16 00:00:00 EDT 2017},
month = {Fri Jun 16 00:00:00 EDT 2017}
}

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