Bacteriolytic activity caused by the presence of a novel lactococcal plasmid encoding lactococcins A, B, and M

Article Abstract:

A new, nonmobilizable plasmid in Lactococcus lactis subsp. lactis biovar diacetylactis DPC938 produces the bacteriocins lactococcins A, B, and M, which appear to have bacteriolytic activity. The DNA encoding the bacteriocins in DPC938 was shown to be highly similar that in strains 9B4 and DPC3286. Lysis was indicated by the release of intracellular enzymes and a decrease in optical density and viable count. These lytic effects may be useful in accelerating cheese ripening.

Analysis, Plasmids, Bacteria, Microbiological research

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Fate of the two-component lantibiotic lacticin 3147 in the gastrointestinal tract

Article Abstract:

The component peptides of lacticin 3147 are degraded by using [alpha]-chymotrypsin in vitro with a resultant loss of antimicrobial activity in ileum digesta. The findings have shown that lacticin 3147 ingestion does not have adverse effects as it is inactivated during intestinal transit.

Science & research, Peptides, Chemical properties, Ileum, Chymotrypsin

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