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2017 ; 7
(1
): 4324
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Nano-engineering the Antimicrobial Spectrum of Lantibiotics: Activity of Nisin
against Gram Negative Bacteria
#MMPMID28659619
Vukomanovi? M
; ?uni? V
; Kunej ?
; Jan?ar B
; Jeverica S
; Podlipec R
; Suvorov D
Sci Rep
2017[Jun]; 7
(1
): 4324
PMID28659619
show ga
Lantibiotics, bacteria-sourced antimicrobial peptides, are very good candidates
for effective and safe food additives. Among them, nisin is already approved by
the EU and FDA, and has been used in food preservation for the past 40 years.
Now, there is a possibility and strong interest to extend its applicability to
biomedicine for designing innovative alternatives to antibiotics. The main
obstacle is, however, its naturally narrow spectrum of antimicrobial activity,
focused on Gram positive bacteria. Here we demonstrate broadening nisin's
spectrum to Gram negative bacteria using a nano-engineering approach. After
binding nisin molecules to the surface of gold nano-features, uniformly deposited
on spherical carbon templates, we created a nanocomposite with a high density of
positively charged groups. Before assembly, none of the components of the
nanocomposite showed any activity against bacterial growth, which was changed
after assembly in the form of the nanocomposite. For the first time we showed
that this type of structure enables interactions capable of disintegrating the
wall of Gram negative bacteria. As confirmed by the nisin model, the developed
approach opens up new horizons for the use of lantibiotics in designing
post-antibiotic drugs.