Antimicrobial peptide dendrimer interacts with phosphocholine membranes in a fluidity dependent manner : A neutron reflection study combined with molecular dynamics simulations

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Antimicrobial peptide dendrimer interacts with phosphocholine membranes in a fluidity dependent manner : A neutron reflection study combined with molecular dynamics simulations

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Publication Article, peer reviewed scientific
Title Antimicrobial peptide dendrimer interacts with phosphocholine membranes in a fluidity dependent manner : A neutron reflection study combined with molecular dynamics simulations
Author(s) Lind, TK ; Darré, L ; Domene, C ; Urbanczyk-Lipkowska, Z ; Cárdenas, Marité ; Wacklin, HP
Date 2015
English abstract
The interaction mechanism of a novel amphiphilic antimicrobial peptide dendrimer, BALY, with model lipid bilayers was explored through a combination of neutron reflection and molecular dynamics simulations. 1-Palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and 1,2-dipalmitoyl-sn-glycero-3-phos-phocholine (DPPC) lipid bilayers were examined at room temperature to extract information on the interaction of BALY with fluid and gel phases, respectively. Furthermore, a 1:4 mixture of POPC and DPPC was used as a model of a phase-separated membrane. Upon interaction with fluid membranes, BALY inserted in the distal leaflet and caused thinning and disordering of the headgroups. Membrane thinning and expansion of the lipid cross-sectional area were observed for gel phase membranes, also with limited insertion to the distal leaflet. However, dendrimer insertion through the entire lipid tail region was observed upon crossing the lipid phase transition temperature of DPPC and in phase separated membranes. The results show clear differences in the interaction mechanism of the dendrimer depending on the lipid membrane fluidity, and suggest a role for lipid phase separation in promoting its antimicrobial activity.
DOI http://dx.doi.org/10.1016/j.bbamem.2015.05.015 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Biochimica et biophysica acta;10
Volume 1848
ISSN 0006-3002
Pages 2075-2084
Language eng (iso)
Subject(s) Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/19814 (link to this page)

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