1887

Abstract

The expression of a wide variety of physiological functions in many bacterial species is modulated by quorum sensing, a population-dependent signalling mechanism that involves the production and detection of extracellular signalling molecules. The genome sequence of NCTC 11168 contains a gene encoding an orthologue of LuxS, which is required for autoinducer-2 (AI-2) production in other bacterial species, but does not contain genes predicted to encode any known acyl-homoserine lactone synthetase. This study demonstrates that produces functional AI-2 activity through the ability of cell-free extracts to specifically induce bioluminescence in BB170, a reporter strain for quorum-sensing system 2. Production of this signalling compound was shown to be dependent upon the product of the gene (Cj1198). While the mutant showed comparable growth rate, resistance to oxidative stress and ability to invade Caco-2 cell monolayers to the parental strain, it exhibited decreased motility haloes in semisolid media, suggesting a role for quorum sensing in the regulation of motility.

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2002-05-01
2021-07-26
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