PMID: 9537384Apr 16, 1998Paper

An exported inducer peptide regulates bacteriocin production in Enterococcus faecium CTC492

Journal of Bacteriology
Trine NilsenH Holo

Abstract

Production of the bacteriocins enterocin A and enterocin B in Enterococcus faecium CTC492 was dependent on the presence of an extracellular peptide produced by the strain itself. This induction factor (EntF) was purified, and amino acid sequencing combined with DNA sequencing of the corresponding gene identified it as a peptide of 25 amino acids. The gene encodes a prepeptide of 41 amino acids, including a 16-amino-acid leader peptide of the double-glycine type. Environmental factors influenced the level of bacteriocin production in E. faecium CTC492. The optimal pH for bacteriocin production was 6.2. At pH 5.5, growth was slow, and very little bacteriocin was formed. The presence of NaCl or ethanol (EtOH) was also inhibitory to bacteriocin production, and at high concentrations of these solutes, no bacteriocin production was observed. The induction factor induced its own synthesis, and by dilution of the culture 106 times or more, nonproducing cultures were obtained. Bacteriocin production was induced in these cultures by addition of EntF. The response was linear, and low bacteriocin production could be induced by about 10(-17) M EntF. This response was attenuated by low pH or the presence of high concentrations of NaCl or EtO...Continue Reading

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Jan 21, 2000·FEMS Microbiology Reviews·S EnnaharA Ishizaki
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