Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1862, Issue 2, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.bbamem.2019.183135
Keywords
Bacteriocin; Bacterial membrane; Listeria; X-ray diffraction; Monolayer; Spectroscopy
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Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), FONCYT, Argentina [3563, 0819]
- LNLS-CNPeM [20170143]
- Concejo Interuniversitario Nacional (CIN), Argentina
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The mechanism of action of the anti-Listeria peptide enterocin CRL35 was studied with biophysical tools by using lipid mixtures that mimicked Gram-positive plasma membranes. Langmuir monolayers and infrared spectroscopy indicated that the peptide readily interacted with phospholipid assembled in monolayers and bilayers to produce a dual effect, depending on the acyl chains. Indeed, short chain mixtures were disordered by enterocin CRL35, but the gel-phases of membranes composed by longer acyl chains were clearly stabilized by the bacteriocin. Structural and functional studies indicated that non-bilayer states were formed when liposomes were co-incubated with enterocin CRL35, whereas significant permeabilization could be detected when bilayer and non-bilayer states co-existed. Results can be explained by a two-step model in which the N-terminal of the peptide firstly docks enterocin CRL35 on the lipid surface by means of electrostatic interactions; then, C-terminal triggers membrane perturbation by insertion of hydrophobic alpha-helix.
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