Membrane interactions of novicidin, a novel antimicrobial peptide: Phosphatidylglycerol promotes bilayer insertion

Jerzy Dorosz, Yana Gofman, Sofiya Kolusheva, Daniel Otzen, Nir Ben-Tal, Niels Chr Nielsen, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Novicidin is an antimicrobial peptide derived from ovispirin, a cationic peptide which originated from the ovine cathelicidin SMAP-29. Novicidin, however, has been designed to minimize the cytotoxic properties of SMAP-29 and ovisipirin toward achieving potential therapeutic applications. We present an analysis of membrane interactions and lipid bilayer penetration of novicidin, using an array of biophysical techniques and biomimetic membrane assemblies, complemented by Monte Carlo (MC) simulations. The data indicate that novicidin interacts minimally with zwitterionic bilayers, accounting for its low hemolytic activity. Negatively charged phosphatidylglycerol, on the other hand, plays a significant role in initiating membrane binding of novicidin, and promotes peptide insertion into the interface between the lipid headgroups and the acyl chains. The significant insertion into bilayers containing negative phospholipids might explain the enhanced antibacterial properties of novicidin. Overall, this study highlights two distinct outcomes for membrane interactions of novicidin, and points to a combination between electrostatic attraction to the lipid/water interface and penetration into the subsurface lipid headgroups region as important determinants for the biological activity of novicidin.

Original languageEnglish
Pages (from-to)11053-11060
Number of pages8
JournalJournal of Physical Chemistry B
Volume114
Issue number34
DOIs
StatePublished - 2 Sep 2010

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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