Discovery of Complex Mixtures of Novel Long-Chain Quorum Sensing Signals in Free-Living and Host-Associated Marine Alphaproteobacteria

More than 100 bacterial isolates from various marine habitats were screened for AHL production by using gfp reporter constructs based on the lasR system of Pseudomonas aeruginosa and the luxR system of Vibrio fischeri. Of the 67 Alphaproteobacteria tested, most of which belonged into the so-called R...

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Published in:	Chembiochem : a European journal of chemical biology Vol. 6; no. 12; pp. 2195 - 2206
Main Authors:	Wagner-Döbler, Irene, Thiel, Verena, Eberl, Leo, Allgaier, Martin, Bodor, Agnes, Meyer, Sandra, Ebner, Sabrina, Hennig, Andreas, Pukall, Rüdiger, Schulz, Stefan
Format:	Journal Article
Language:	English
Published:	Weinheim Wiley-VCH Verlag 01-12-2005 WILEY-VCH Verlag WILEY‐VCH Verlag
Subjects:	Alphaproteobacteria - isolation & purification Alphaproteobacteria - physiology Biosensing Techniques - methods Cell Communication gas chromatography Gene Expression Regulation, Bacterial lactones Lactones - analysis Marine Biology mass spectrometry Pseudomonas aeruginosa receptors Rhodobacter sphaeroides Roseobacter Roseovarius tolerans Signal Transduction structure elucidation Vibrio fischeri
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Summary:	More than 100 bacterial isolates from various marine habitats were screened for AHL production by using gfp reporter constructs based on the lasR system of Pseudomonas aeruginosa and the luxR system of Vibrio fischeri. Of the 67 Alphaproteobacteria tested, most of which belonged into the so-called Roseobacter clade, 39 induced fluorescence in either one or both sensor strains up to 103-fold compared to controls. Acylated homoserine lactones were identified by GC-MS analysis and shown to have chain lengths of C₈, C₁₀, C₁₃-C₁₆, and C₁₈. One or two double bonds were often present, while a keto or hydroxyl group occurred only rarely in the side chain. Most strains produced several different AHLs. C₁₈-en-HSL and C₁₈-dien-HSL were produced by Dinoroseobacter shibae, an aerobic anoxygenic phototrophic bacterium isolated from dinoflagellates, and are among the longest AHLs found to date. Z7-C₁₄-en-HSL, which has previously been detected in Rhodobacter sphaeroides, was produced by Roseovarius tolerans and Jannaschia helgolandensis. This signal molecule was synthesised and shown to induce a similar response to the culture supernatant in the respective sensor strain. The widespread occurrence of quorum-sensing compounds in marine Alphaproteobacteria, both free-living strains and those associated to eukaryotic algae, points to a great importance of this signalling mechanism for the adaptation of the organisms to their widely different ecological niches.
Bibliography:	http://dx.doi.org/10.1002/cbic.200500189 ArticleID:CBIC200500189 istex:C8EC50493BFB5E1584382F97923E6EE9BBB9C87B ark:/67375/WNG-6M33KH8P-J ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1439-4227 1439-7633 1439-4227
DOI:	10.1002/cbic.200500189