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Antimicrobial Activity of Bacillus Amyloliquefaciens LBM 5006 is Enhanced in the Presence of Escherichia Coli

Overview
Journal Curr Microbiol
Specialty Microbiology
Date 2010 Nov 25
PMID 21104084
Citations 7
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Abstract

Increased antimicrobial activity was observed when Bacillus amyloliquefaciens LBM 5006 strain was cultivated in the presence of thermally inactivated cells of Escherichia coli, but not with Staphylococcus aureus, Listeria monocytogenes, or Bacillus cereus. E. coli also enhanced the antimicrobial activity when it was added to the medium in the form of living cells or as cell debris after cellular fractionation. No inducing activity was observed with addition of cell-free supernatant of E. coli cultures, suggesting that inducing factor is associated to the cells. Polyacrylamide gel electrophoresis revealed that additional peptide bands are secreted when B. amyloliquefaciens was cultivated in the presence of cell debris of E. coli. These results suggest that the presence of intact or inactivated E. coli enhanced the synthesis of antimicrobial peptides by B. amyloliquefaciens LBM 5006.

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