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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Front+Microbiol
2016 ; 7
(ä): 504
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gab.com Text
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English Wikipedia
Protein Defense Systems against the Lantibiotic Nisin: Function of the Immunity
Protein NisI and the Resistance Protein NSR
#MMPMID27148193
Khosa S
; Lagedroste M
; Smits SH
Front Microbiol
2016[]; 7
(ä): 504
PMID27148193
show ga
Lantibiotics are potential alternatives to antibiotics because of their
broad-range killing spectrum. The producer strain is immune against its own
synthesized lantibiotic via the expression of two proteins LanI and LanFEG.
Recently, gene operons are found in mainly human pathogenic strains, which confer
resistance against lantibiotics. Of all the lantibiotics discovered till date,
nisin produced by some Lactococcus lactis strains is the most prominent member.
Nisin has multiple mode of actions of which binding to the cell wall precursor
lipid II and subsequent insertion into the bacterial membrane to form pores are
the most effective. The nisin producing strains express the lipoprotein NisI to
prevent a suicidal effect. NisI binds nisin, inducing a reversible cell
clustering to prevent nisin from reaching the membrane. Importantly NisI does not
modify nisin and releases it as soon as the concentration in the media drops
below a certain level. The human pathogen Streptococcus agalactiae is naturally
resistant against nisin by expressing a resistance protein called SaNSR, which is
a nisin degrading enzyme. By cleaving off the last six amino acids of nisin, its
effectiveness is 100-fold reduced. This cleavage reaction appears to be specific
for nisin since SaNSR recognizes the C-terminal located lanthionine rings.
Recently, the structures of both NisI and SaNSR were determined by NMR and X-ray
crystallography, respectively. Furthermore, for both proteins the binding site
for nisin was determined. Within this review, the structures of both proteins and
their different defense mechanisms are described.