Authors: Villani, F.; Aponte, M.; Blaiotta, G.; Mauriello, G.; Pepe, O.; Moschetti, G.

Source: Journal of Applied Microbiology, Volume 90, Number 3, March 2001 , pp. 430-439(10)

Publisher: Wiley-Blackwell

Abstract:

Aims: The identification of a bacteriocin-producing lactococcal strain isolated from raw cow's milk is reported, along with production conditions, physical and chemical properties, and mode of action of the bacteriocin.

Methods and Results: On the basis of resistance to clindamycin, species-specific PCR and amplification of the 16S-23S rDNA spacer region, the strain was identified as Lactococcus garvieae. Its bacteriocin, designated garviecin L1-5, was bactericidal against closely related species and strains of species from different genera, including Listeria monocytogenes and Clostridium spp. Garviecin L1-5 was shown to be proteinaceous by protease inactivation and was unaffected by heat treatments, also at low pH values. When amplifying known lactococcal bacteriocin genes using DNA from strain L1-5 as template, no amplification products were observed on the agarose gel. The molecular weight of garviecin L1-5 was about 2·5 kDa. As far as is known, no bacteriocins have been detected from Lactococcus garvieae.

Conclusions: The general properties of garviecin L1-5 are characteristic of the low-molecular-weight bactericidal peptide group.

Significance and Impact of the Study: The survey of micro-organisms for novel antimicrobial substances provided valuable information on their physiology, ecology and practical application.

Document Type: Research article

DOI: http://dx.doi.org/10.1046/j.1365-2672.2001.01261.x

Affiliations: 1: Dipartimento di Scienza degli Alimenti, Sezione di Microbiologia Agraria, Alimentare ed Ambientale e di Igiene, Università degli Studi di Napoli `Federico II', Portici, Italy

Publication date: 2001-03-01

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