1887

Abstract

Summary: The strain 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 104-10 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.

Funding
This study was supported by the:
  • Comision Interministerial de Ciencia y Tecnologia, Spain (Award ALI94-1026)
  • Commission of European Communities (Award Biot-CT94-03055)
  • The Nordic Industrial Fund (Award P93154)
  • The Norwegian Dairies Association, Oslo, Norway
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1997-07-01
2021-05-08
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