Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 75, Issue 3, Pages 567-572Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.00632-08
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Funding
- NSF [MCB 04538743]
- NIH [P20 RR016457]
- National Center for Research Resources
- NCRR/NIH [P20 RR016457]
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Certain bacteria use cell-to-cell chemical communication to coordinate community-wide phenotypic expression, including swarming motility, antibiotic biosynthesis, and biofilm production. Here we present a marine gram-positive bacterium that secretes secondary metabolites capable of quenching quorum sensing-controlled behaviors in several gram-negative reporter strains. Isolate C42, a Halobacillus salinus strain obtained from a sea grass sample, inhibits bioluminescence production by Vibrio harveyi in cocultivation experiments. With the use of bioassay-guided fractionation, two phenethylamide metabolites were identified as the active agents. The compounds additionally inhibit quorum sensing-regulated violacein biosynthesis by Chromobacterium violaceum CV026 and green fluorescent protein production by Escherichia coli JB525. Bacterial growth was unaffected at concentrations below 200 mu/ml. Evidence is presented that these nontoxic metabolites may act as antagonists of bacterial quorum sensing by competing with N-acyl homoserine lactones for receptor binding.
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