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In previous work we have isolated and identified a new strain called  Enterococcus faecium  FL31. The active compound secreted by this strain, “BacFL31”, has been purified and characterized. In the present study, safety aspect, assessed by microbiological and molecular tests, demonstrated that  Enterococcus faecium  FL31 was susceptible to relevant antibiotics, free of hemolytic, gelatinase, DNase, and lipase activities. In addition, it did not harbor virulence and antibiotic resistance genes. Combined SYTOX Green dye and UV-absorbing experiments, along with released extracellular potassium and transmembrane electrical potential measurements, showed that pure BacFL31 at a concentration of 1×MIC (50  μ g/mL) could damage cytoplasmic membrane of the pathogen  Listeria monocytogenes  ATCC19117. The same concentration causes the leakage of its intracellular constituents and leads to the destruction of this pathogenic microorganism. In summary, this work reflected characteristics of  Enterococcus faecium  FL31 strain and its bacteriocin in terms of functional and safety perspectives.

biomed research international

Safety Aspect of<i>Enterococcus faecium</i>FL31 Strain and Antibacterial Mechanism of Its Hydroxylated Bacteriocin BacFL31 against<i>Listeria monocytogenes</i>

Safety Aspect ofEnterococcus faeciumFL31 Strain and Antibacterial Mechanism of Its Hydroxylated Bacteriocin BacFL31 againstListeria monocytogenes