A newly discovered bacteriocin produced by Enterococcus faecalis 3915

International audienceDifferent Enterococci, isolated from starters for the production of the traditional Bulgarian yellow cheese 'Kashkaval'were screened for bacteriocin production, and one of them, Enterococcus faecalis 3915 demonstrated bacteriocin activity. In this study, we investigated the growth parameters of the producer strain as well as the production kinetics and preliminary characterisation of the produced bacteriocin named enterocin 3915. For the growth modelling, the logistic model was used, while bacteriocin production was monitored. Experiments on inducibility were conducted, and strain was checked for the presence of plasmids. The peptide was crudely purified by ammonium sulphate precipitation followed by preparative PAGE. The approximate molecular mass was determined electrophoretically,and the activity was visualised by electrophoresis and agar overlay technique. It was found that E. faecalis 3915produces a bacteriocin with constitutive synthesis and chromosomal localisation of its genetic determinants. The peptide revealed to be relatively heat-stable with a molecular mass of about 6.5 kDa. As E. faecalis 3915 originates from cheese starter it can be classified as generally recognised as safe (GRAS). The inhibitory activity of enterocin 3915 comprises commensals or pathogens, so properties generally accepted as probiotic could be attributed to the producer, and potential application in the dairy industry is not to be exclude

A newly discovered bacteriocin produced by <i>Enterococcus faecalis</i> 3915

Different Enterococci, isolated from starters for the production of the traditional Bulgarian yellow cheese 'Kashkaval' were screened for bacteriocin production, and one of them, Enterococcus faecalis 3915 demonstrated bacteriocin activity. In this study, we investigated the growth parameters of the producer strain as well as the production kinetics and preliminary characterisation of the produced bacteriocin named enterocin 3915. For the growth modelling, the logistic model was used, while bacteriocin production was monitored. Experiments on inducibility were conducted, and strain was checked for the presence of plasmids. The peptide was crudely purified by ammonium sulphate precipitation followed by preparative PAGE. The approximate molecular mass was determined electrophoretically, and the activity was visualised by electrophoresis and agar overlay technique. It was found that E. faecalis 3915 produces a bacteriocin with constitutive synthesis and chromosomal localisation of its genetic determinants. The peptide revealed to be relatively heat-stable with a molecular mass of about 6.5 kDa. As E. faecalis 3915 originates from cheese starter it can be classified as generally recognised as safe (GRAS). The inhibitory activity of enterocin 3915 comprises commensals or pathogens, so properties generally accepted as probiotic could be attributed to the producer, and potential application in the dairy industry is not to be excluded. </jats:p

SIPP Policy Dialogue Number 9 Fall 2004

The Heavy Hand of History 1; Director’s Notes 2; SIPP News 3; New Research Director for SIPP: Mr. Ian Peach 4; Website Makeover and Membership Drive Focuses on Public Policy 6; Weathering the Storm or Reaping the Harvest? 7; Canadian Social Policy Renewal and the National Child Benefit 8; Reaching Canada’s Youth 10; Publication and Class Release Opportunities (U of R) 11; Federalism Magazine Makes Its Way Around the World 11; Perspective • Engagement • Ideas 12;Staffye