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. 1992 Feb;58(2):572–577. doi: 10.1128/aem.58.2.572-577.1992

Cloning, sequencing, and expression in Escherichia coli of lcnB, a third bacteriocin determinant from the lactococcal bacteriocin plasmid p9B4-6.

M J van Belkum 1, J Kok 1, G Venema 1
PMCID: PMC195286  PMID: 1610182

Abstract

On the bacteriocin plasmid p9B4-6 of Lactococcus lactis subsp. cremoris 9B4, a third bacteriocin determinant was identified. The genes encoding bacteriocin production and immunity resided on a 1.2-kb CelII-ScaI fragment and were located adjacent to one of two previously identified bacteriocin operons (M. J. van Belkum, B. J. Hayema, R. E. Jeeninga, J. Kok, and G. Venema, Appl. Environ. Microbiol. 57:492-498, 1991). The fragment was sequenced and analyzed by deletion and mutation analyses. The bacteriocin determinant consisted of two genes which were transcribed as an operon. The first gene (lcnB), containing 68 codons, was involved in bacteriocin activity. The second gene (lciB) contained 91 codons and was responsible for immunity. The specificity of this novel bacteriocin, designated lactococcin B, was different from that of the other two bacteriocins specified by p9B4-6. Part of the nucleotide sequence of the lactococcin B operon was similar to a nucleotide sequence also found in the two other bacteriocin operons of p9B4-6. This conserved region encompassed a nucleotide sequence upstream of the bacteriocin gene and the 5' part of the gene. When the lactococcin B operon was expressed in Escherichia coli by using a T7 RNA polymerase-specific promoter, antagonistic activity could be detected.

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Selected References

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