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luxS Mutant Regulation: Quorum Sensing Impairment or Methylation Disorder?
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Sensors 2012, 12(5), 6645-6665; https://doi.org/10.3390/s120506645

Detection of AI-2 Receptors in Genomes of Enterobacteriaceae Suggests a Role of Type-2 Quorum Sensing in Closed Ecosystems

Plant Protection Division, Agroscope Changins-Wädenswil ACW, Schloss 1, Wädenswil CH-8820, Switzerland
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Received: 31 March 2012 / Revised: 11 May 2012 / Accepted: 16 May 2012 / Published: 21 May 2012
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Abstract

The LuxS enzyme, an S-ribosyl-homocysteine lyase, catalyzes the production of the signal precursor for autoinducer-2 mediated quorum sensing (QS-2) in Vibrio. Its widespread occurrence among bacteria is often considered the evidence for a universal language for interspecies communication. Presence of the luxS gene and production of the autoinducer-2 (AI-2) signal have repeatedly been the only evidences presented to assign a functional QS-2 to the most diverse species. In fact, LuxS has a primary metabolic role as part of the activated methyl cycle. In this review we have analyzed the distribution of QS-2 related genes in Enterobacteriaceae by moving the focus of the investigation from AI-2 production to the detection of potential AI-2 receptors. The latter are common in pathogens or endosymbionts of animals, but were also found in a limited number of Enterobacteriaceae of the genera Enterobacter, Klebsiella, and Pantoea that live in close association with plants or fungi. Although a precise function of QS-2 in these species has not been identified, they all show an endophytic or endosymbiontic lifestyle that suggests a role of type-2 quorum sensing in the adaptation to closed ecosystems. View Full-Text
Keywords: LuxS; N-acyl homoserine lactone; Erwinia; Pantoea; Salmonella; Serratia; Enterobacter; metabolism; autoinducer; plant pathogen; nitrogen fixation LuxS; N-acyl homoserine lactone; Erwinia; Pantoea; Salmonella; Serratia; Enterobacter; metabolism; autoinducer; plant pathogen; nitrogen fixation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Rezzonico, F.; Smits, T.H.M.; Duffy, B. Detection of AI-2 Receptors in Genomes of Enterobacteriaceae Suggests a Role of Type-2 Quorum Sensing in Closed Ecosystems. Sensors 2012, 12, 6645-6665.

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