Abstract：
:A new rapid and sensitive method for the detection of antibacterial activities was based on luminescent indicator strains. Listeria innocua 8811 and Enterococcus faecalis 32 were transformed with plasmid carrying bacterial luciferase genes. Subsequent strains became capable to emit light during the exponential growth phase. The addition of bacteriocin containing culture supernatants to such cultures induced a drop of their light emission which was correlated to the combined antibacterial activity of acid stress and bacteriocin. The detection of antagonistic activity is independent of its mode of action, i.e. bactericidal or bacteriostatic. This method allowed to directly visualize the antagonistic activity of bacteriocin producer strains toward target strains in coculture experiments. However, a control co-culture with non-producing bacteriocin mutant was necessary in order to distinguish between nutrients competition and bacteriocin activity. Finally, five class IIa bacteriocins were purified from culture supernatants of eight strains detected in 3 days from a 120 lactic acid bacteria collection.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Simon L,Fremaux C,Cenatiempo Y,Berjeaud JMdoi
10.1007/s00253-001-0833-3subject
Has Abstractpub_date
2001-12-01 00:00:00pages
757-63issue
5-6eissn
0175-7598issn
1432-0614journal_volume
57pub_type
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abstract：:Streptococcus thermophilus (ST) is a lactic acid bacterium widely used in dairy industry and displays several properties which could be beneficial for host. The objective of this study was to investigate, in vitro, the implication of sortase A (SrtA) and sortase-dependent proteins (SDPs) in the adhesion of ST LMD-9 st...
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journal_title：Applied microbiology and biotechnology
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journal_title：Applied microbiology and biotechnology
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