PMID:16597969

Citation	Challan Belval, S, Gal, L, Margiewes, S, Garmyn, D, Piveteau, P and Guzzo, J (2006) Assessment of the roles of LuxS, S-ribosyl homocysteine, and autoinducer 2 in cell attachment during biofilm formation by Listeria monocytogenes EGD-e. Appl. Environ. Microbiol. 72:2644-50
Abstract	LuxS is responsible for the production of autoinducer 2 (AI-2), which is involved in the quorum-sensing response of Vibrio harveyi. AI-2 is found in several other gram-negative and gram-positive bacteria and is therefore considered a good candidate for an interspecies communication signal molecule. In order to determine if this system is functional in the gastrointestinal pathogen Listeria monocytogenes EGD-e, an AI-2 bioassay was performed with culture supernatants. The results indicated that this bacterium produces AI-2 like molecules. A potential ortholog of V. harveyi luxS, lmo1288, was found by performing sequence similarity searches and complementation experiments with Escherichia coli DH5alpha, a luxS null strain. lmo1288 was found to be a functional luxS ortholog involved in AI-2 synthesis. Indeed, interruption of lmo1288 resulted in loss of the AI-2 signal. Although no significant differences were observed between Lux1 and EGD-e with regard to planktonic growth (at 10 degrees C, 15 degrees C, 25 degrees C, and 42 degrees C), swimming motility, and phospholipase and hemolytic activity, biofilm culture experiments showed that under batch conditions between 25% and 58% more Lux1 cells than EGD-e cells were attached to the surface depending on the incubation time. During biofilm growth in continuous conditions after 48 h of culture, Lux1 biofilms were 17 times denser than EGD-e biofilms. Finally, our results showed that Lux1 accumulates more S-adenosyl homocysteine (SAH) and S-ribosyl homocysteine (SRH) in culture supernatant than the parental strain accumulates and that SRH, but not SAH or AI-2, is able to modify the number of attached cells.
Links	PubMed PMC1449078 Online version:10.1128/AEM.72.4.2644-2650.2006
Keywords	Animals; Bacterial Adhesion; Bacterial Proteins/metabolism; Biofilms/growth & development; Carbon-Sulfur Lyases; Gene Expression Regulation, Bacterial; Genetic Complementation Test; Homocysteine/analogs & derivatives; Homocysteine/metabolism; Homoserine/analogs & derivatives; Homoserine/metabolism; Lactones/metabolism; Listeria monocytogenes/physiology; Listeria monocytogenes/ultrastructure; Rabbits
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
ECOLI:LSRK		GO:0071518: autoinducer-2 kinase activity	ECO:0000314:		F		Autoinducer 2(AI-2) is generated in large part by LuxS. AI-2 aids in quorum-sensing.	complete CACAO 12460

References

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