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. 1994 Apr;176(8):2235–2241. doi: 10.1128/jb.176.8.2235-2241.1994

Expansion of bacteriocin activity and host range upon complementation of two peptides encoded within the lactacin F operon.

G E Allison 1, C Fremaux 1, T R Klaenhammer 1
PMCID: PMC205344  PMID: 8157592

Abstract

Lactacin F is a membrane-active bacteriocin produced by Lactobacillus johnsonii VPI11088 (Laf+). The genetic determinants encoding lactacin F are organized in a 1-kb polycistronic operon composed of a promoter (P(laf)), three genes (lafA, lafX, and ORFZ), and a functional rho-independent transcription terminator. Two Laf- derivatives of VPI11088, designated NCK64 and NCK65, were characterized. NCK64 contained a frameshift mutation in the lafA gene causing premature termination of translation. NCK65 harbored a 10-kb chromosomal deletion covering the laf operon. When the lafA gene was cloned independently and expressed in NCK65, bacteriocin activity was limited to L. helveticus 87, only one of the six known lactacin F-sensitive (Lafs) indicators. When lafX was introduced into NCK65, no bacteriocin activity against any of the sensitive strains was detected. Genetic combination of lafA and lafX, in cis or in trans, restored bacteriocin activity against all Lafs indicators. When two NCK65 clones containing either lafA or lafX were plated slightly apart on agar plates, fully active lactacin F was present in the intervening area where the two excreted gene products, LafA and LafX, diffused together. The genetic analysis revealed that the interaction of two bacteriocinogenic peptides encoded within the laf operon is likely to participate in the formation of poration complexes in the membranes of susceptible bacteria.

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Selected References

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