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J. Bacteriol., 06 1996, 3585-3593, Vol 178, No. 12
Copyright © 1996, American Society for Microbiology

Cloning and genetic organization of the bacteriocin 31 determinant encoded on the Enterococcus faecalis pheromone-responsive conjugative plasmid pYI17

H Tomita, S Fujimoto, K Tanimoto and Y Ike
Department of Microbiology, Gunma University School of Medicine, Maebashi, Gunma, Japan.

The conjugative plasmid pYI17 (57.5 kb) isolated from Enterococcus faecalis YI717 confers a pheromone response on the host and encodes the bacteriocin 31 gene. Bacteriocin 31 is active against E. hirae 9790, E. faecium, and Listeria monocytogenes. pYI17 was mapped physically by restriction enzyme analysis and the relational clone method. Deletion mutant and sequence analyses of the EcoRI fragment B cloned from pYl17 revealed that a 1.0-kb fragment contained the bacteriocin gene (bacA) and an immunity gene (bacB). This fragment induced bacteriocin activity in E. faecalis OG1X and E. hirae 9790. The bacA gene is located on the pYI17 physical map between 3.37 and 3.57 kb, and bacB is located between 3.59 kb and 3.87 kb, bacA encodes 67 amino acids, and bacB encodes 94 amino acids. The deduced amino acid sequence of the bacA protein contained a series of hydrophobic residues typical of a signal sequence at its amino terminus. The predicted mature bacA protein (43 amino acids) showed sequence homology with the membrane-active class II bacteriocins of lactic acid bacteria. Analysis of Tn5 insertion mutants and the resulting transcripts indicated that these genes are transcribed as an operon composed of bacA, bacB, and an open reading frame located downstream of bacB designated ORF3.


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