PMID:19878720

Citation	Li, X, Han, Y, Yang, Q and Zhang, XH Detection of quorum sensing signal molecules and mutation of luxS gene in Vibrio ichthyoenteri. Res. Microbiol. 161:51-7
Abstract	Some pathogenic species belonging to the Vibrionaceae family have been shown to regulate virulence through a complicated network of quorum sensing systems. In this study, three kinds of N-acylhomoserine lactone (AHL) signal molecules were detected in Vibrio ichthyoenteri DA3, a pathogen of cultured turbot (Scophthalmus maximus), with the Agrobacterium tumefaciens reporter strain KYC55 (pJZ372)(pJZ384)(pJZ410). DA3 produced AHLs during the entire growth phase, and the level of AHLs increased, accompanied by an increase in cell population density. DA3 was also shown to have autoinducer 2 (AI-2) activities. The level of AI-2 activity in DA3 increased rapidly during the exponential phase of growth and maintained a high level up until the stationary phase. The coding sequence for a luxS-like gene of DA3 was obtained showing maximum similarity of 99.6% with that of Vibrio scophthalmi. A mutation in luxS produced no detectable AI-2 activity, but did not result in noticeable changes in growth rate, biofilm formation or virulence of V. ichthyoenteri to turbot, implying that luxS may not play a significant role in regulating virulence gene expression in this bacterium, or that different signal systems need to be inactivated at once in order to decrease virulence. Neither V. ichthyoenteri DA3 nor type strain LMG19664(T) produced any cholerae autoinducer 1 (CAI-1) activity.
Links	PubMed Online version:10.1016/j.resmic.2009.10.004
Keywords	Acyl-Butyrolactones/metabolism; Agrobacterium tumefaciens/genetics; Animals; Bacterial Proteins/genetics; Biofilms/growth & development; Carbon-Sulfur Lyases/genetics; DNA, Bacterial/chemistry; DNA, Bacterial/genetics; Fish Diseases/microbiology; Flatfishes/microbiology; Gene Deletion; Homoserine/analogs & derivatives; Homoserine/metabolism; Lactones/metabolism; Molecular Sequence Data; Quorum Sensing; Sequence Analysis, DNA; Sequence Homology; Vibrio/genetics; Vibrio/metabolism; Vibrio/pathogenicity; Vibrio/physiology; Vibrio Infections/microbiology; Vibrio Infections/veterinary; Virulence
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
9VIBR:D1KF54		GO:0009372: quorum sensing	ECO:0000315:		P		Figure 3- V. ichthyoenteri produces AI-2 activity, whereas the LuxS mutant strain produces no detectable AI-2 activity in V. harveyi reporter strain BB170	complete

References

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