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Appl. Environ. Microbiol., 03 1995, 1082-1089, Vol 61, No. 3
K Siegers and KD Entian
The lantibiotic nisin is produced by several strains of Lactococcus lactis.
The complete gene cluster for nisin biosynthesis in L. lactis 6F3 comprises
15 kb of DNA. As described previously, the structural gene nisA is followed
by the genes nisB, nisT, nisC, nisI, nisP, nisR, and nisK. Further analysis
revealed three additional open reading frames, nisF, nisE, and nisG,
adjacent to nisK. Approximately 1 kb downstream of the nisG gene, three
open reading frames in the opposite orientation have been identified. One
of the reading frames, sacR, belongs to the sucrose operon, indicating that
all genes belonging to the nisin gene cluster of L. lactis 6F3 have now
been identified. Proteins NisF and NisE show strong homology to members of
the family of ATP-binding cassette (ABC) transporters, and nisG encodes a
hydrophobic protein which might act similarly to the immunity proteins
described for several colicins. Gene disruption mutants carrying mutations
in the genes nisF, nisE, and nisG were still able to produce nisin.
However, in comparison with the wild-type strain, these mutants were more
sensitive to nisin. This indicates that besides nisI the newly identified
genes are also involved in immunity to nisin. The NisF-NisE ABC transporter
is homologous to an ABC transporter of Bacillus subtilis and the MbcF-MbcE
transporter of Escherichia coli, which are involved in immunity to subtilin
and microcin B17, respectively.
Copyright © 1995, American Society for Microbiology
Genes involved in immunity to the lantibiotic nisin produced by Lactococcus lactis 6F3
Institut fur Mikrobiologie, Johann Wolfgang Goethe-Universitat, Frankfurt am Main, Germany.
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