Enterocin B, a new bacteriocin from Enterococcus faecium T136 which can act synergistically with enterocin A

Pilar Casaus, Trine Nilsen, Luis M. Cintas, Ingolf F. Nes, Pablo E. Hernández, Helge Holo

doi:10.1099/00221287-143-7-2287

<jats:p>Summary: The strain <jats:italic>Enterococcus faecium</jats:italic> T136 produces two bacteriocins, enterocin A, a member of the pediocin family of bacteriocins, and a new bacteriocin termed enterocin B. The N-terminal amino acid sequences of enterocins A and B were determined, and the gene encoding enterocin B was sequenced. The primary translation product was a 71 aa peptide containing a leader peptide of the double-glycine type which is cleaved off to give mature enterocin B of 53 aa. Enterocin B does not belong to the pediocin family of bacteriocins and shows strong homology to carnobacteriocin A. However, sequence similarities in their leader peptides and C-termini suggest that enterocin B and carnobacteriocin A are related to bacteriocins of the pediocin family. Enterocins A and B had only slightly different inhibitory spectra, and both were active against a wide range of Gram-positive bacteria, including listeriae, staphylococci and most lactic acid bacteria tested. Both had bactericidal activities, but survival at a frequency of 10<jats:sup>−4</jats:sup>4-10<jats:sup>−2</jats:sup> was observed when sensitive cultures were exposed to either bacteriocin. The number of survivors was drastically reduced when a mixture of the two bacteriocins was added to the cells.</jats:p>

Enterocin B, a new bacteriocin from Enterococcus faecium T136 which can act synergistically with enterocin A

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