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Appl. Environ. Microbiol., Nov 1997, 4252-4260, Vol 63, No. 11
Copyright © 1997, American Society for Microbiology

Characterization of the lacticin 481 operon: the Lactococcus lactis genes lctF, lctE, and lctG encode a putative ABC transporter involved in bacteriocin immunity

A Rince, A Dufour, P Uguen, JP Le Pennec and D Haras
Laboratoire de Genetique Moleculaire, CNRS URA 256, Universite de Rennes I, France.

The lantibiotic lacticin 481 is a bacteriocin produced by Lactococcus lactis strains. The genetic determinants of lacticin 481 production are organized as an operon encoded by a 70-kb plasmid. We previously reported the first three genes of this operon, lctA, lctM, and lctT, which are involved in the bacteriocin biosynthesis and export (A. Rince, A. Dufour, S. Le Pogam, D. Thuault, C. M. Bourgeois, and J.-P. Le Pennec, Appl. Environ. Microbiol. 60:1652-1657, 1994). The operon contains three additional open reading frames: lctF, lctE, and lctG. The hydrophobicity profiles and sequence similarities strongly suggest that the three gene products associate to form an ABC transporter. When the three genes were coexpressed into a lacticin 481-sensitive L. lactis strain, the strain became resistant to the bacteriocin. This protection could not be obtained when any of the three genes was deleted, confirming that lctF, lctE, and lctG are all necessary to provide immunity to lacticin 481. The quantification of the levels of immunity showed that lctF, lctE, and lctG could account for at least 6% and up to 100% of the immunity of the wild-type lacticin 481 producer strain, depending on the gene expression regulation. The lacticin 481 biosynthesis and immunity systems are discussed and compared to other lantibiotic systems.

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