Affiliation:
1. Station de Recherches Laitières, Institut National de la Recherche Agronomique-CRJ, 78352 Jouy-en-Josas Cedex, France, and Departamento de Microbiología, Facultad de Biología, 2 and Instituto de la Grasa y sus Derivados (C.S.I.C.), U.E.I. de Biotecnología de Alimentos, 3 41012 Seville, Spain
Abstract
Twenty-six strains of
Lactobacillus plantarum
isolated from green olive fermentations were tested for cross-antagonistic activities in an agar drop diffusion test. Cell-free supernatants from four of these strains were shown to inhibit the growth of at least one of the
L. plantarum
indicator strains.
L. plantarum
LPCO10 provided the broadest spectrum of activity and was selected for further studies. The inhibitory compound from this strain was active against some gram-positive bacteria, including clostridia and propionibacteria as well as natural competitors of
L. plantarum
in olive fermentation brines. In contrast, no activity against gram-negative bacteria was detected. Inhibition due to the effect of organic acids, hydrogen peroxide, or bacteriophages was excluded. Since the inhibitory activity of the active supernatant was lost after treatment with various proteolytic enzymes, this substance could be classified as a bacteriocin, designated plantaricin S. Plantaricin S was also sensitive to glycolytic and lipolytic enzymes, suggesting that it was a glycolipoprotein. It exhibited a bactericidal and nonbacteriolytic mode of action against indicator cells. This bacteriocin was heat stable (60 min at 100°C), active in a pH range of 3.0 to 7.0, and also stable in crude culture supernatants during storage. Ultrafiltration studies indicated that plantaricin S occurred as multimolecular aggregates and that the size of the smallest active form is between 3 and 10 kDa. In sodium dodecyl sulfate-polyacrylamide gels, plantaricin S migrated as a peptide of ca. 2.5 kDa. Maximum production of plantaricin S was obtained in a fermentor system in unregulated pH and log-phase cultures of
L. plantarum
LPCO10 in MRS broth plus 4% NaCl. In these culture conditions, a second bacteriocin (designated plantaricin T) was produced in late-stationary-phase cultures of
L. plantarum
LPCO10. On the basis of its biological activity, its sensitivity to various enzymes, and its molecular weight (lower than that of plantaricin S) as assessed in sodium dodecyl sulfate-polyacrylamide gel electrophoresis, plantaricin T appeared different from plantaricin S. Curing experiments with
L. plantarum
LPCO10 resulted in the appearance of variants that no longer produced either of the two bacteriocins but that were still immune to both of them.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
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