Abstract
An Enterococcus faecium strain from Nigerian fermented skimmed cow milk ('wara') produced bacteriocin inhibitory towards Lactobacillus, Enterococcus and Listeria strains. The bacteriocin (designated enterocin 01) was inactivated by proteases, heat-stable at 100 degrees c and active at pH 2.0-6.0. The Ent. faecium isolate harboured plasmids of ca 36.3 and 23.1 kb. Curing experiments with ethidium bromide resulted in a bacteriocin-negative mutant which had not lost immunity to the bacteriocin. Slight differences in plasmid profiles between wild-type and mutant indicated a possible plasmid-coded bacteriocin production.
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