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Appl. Environ. Microbiol., Nov 1997, 4321-4330, Vol 63, No. 11
LM Cintas, P Casaus, LS Havarstein, PE Hernandez and IF Nes
Enterocin P is a new bacteriocin produced by Enterococcus faecium P13
isolated from a Spanish dry-fermented sausage. Enterocin P inhibited most
of tested spoilage and food-borne gram-positive pathogenic bacteria, such
as Listeria monocytogenes, Staphylococcus aureus, Clostridium perfringens,
and Clostridium botulinum. Enterocin P is produced during growth in MRS
broth from 16 to 45 degrees C; it is heat resistant (60 min at 100 degrees
C; 15 min at 121 degrees C) and can withstand exposure to pH between 2.0
and 11.0, freeze-thawing, lyophilization, and long-term storage at 4 and
-20 degrees C. The bacteriocin was purified to homogeneity by ammonium
sulfate precipitation, gel filtration, cation-exchange, hydrophobic-
interaction, and reverse-phase liquid chromatography. The sequence of 43
amino acids of the N terminus was obtained by Edman degradation. DNA
sequencing analysis of a 755-bp region revealed the presence of two
consecutive open reading frames (ORFs). The first ORF encodes a 71-
amino-acid protein containing a hydrophobic N-terminal sec-dependent leader
sequence of 27 amino acids followed by the amino acid sequence
corresponding to the purified and sequenced enterocin P. The bacteriocin is
apparently synthesized as a prepeptide that is cleaved immediately after
the Val-Asp-Ala residues (positions -3 to -1), resulting in the mature
bacteriocin consisting of 44 amino acids, and with a theoretical molecular
weight of 4,493. A second ORF, encoding a putative immunity protein
composed of 88 amino acids with a calculated molecular weight of 9,886, was
found immediately downstream of the enterocin P structural gene. Enterocin
P shows a strong antilisterial activity and has the consensus sequence
found in the pediocin-like bacteriocins; however, enterocin P is processed
and secreted by the sec- dependent pathway.
Copyright © 1997, American Society for Microbiology
Biochemical and genetic characterization of enterocin P, a novel sec- dependent bacteriocin from Enterococcus faecium P13 with a broad antimicrobial spectrum
Departamento de Nutricion y Bromatologia III, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain. Luis.Cintas@nlh10.nlh.no
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