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Identification of quorum sensing-controlled genes in Burkholderia ambifaria

Chapalain, Annelise; Vial, Ludovic; Laprade, Natacha; Dekimpe, Valérie; Perreault, Jonathan; Déziel, Éric (2013). Identification of quorum sensing-controlled genes in Burkholderia ambifaria Microbiologyopen , vol. 2 , nº 2. p. 226-242. DOI: 10.1002/mbo3.67.

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Résumé

The Burkholderia cepacia complex (Bcc) comprises strains with a virulence potential toward immunocompromised patients as well as plant growth-promoting rhizobacteria (PGPR). Owing to the link between quorum sensing (QS) and virulence, most studies among Bcc species have been directed toward QS of pathogenic bacteria. We have investigated the QS of B. ambifaria, a PGPR only infrequently recovered from patients. The cepI gene, responsible for the synthesis of the main signaling mol. N-octanoylhomoserine lactone (C8-HSL), was inactivated. Phenotypes of the B. ambifariacepI mutant we obsd., such as increased prodn. of siderophores and decreased proteolytic and antifungal activities, are in agreement with those of other Bcc cepI mutants. The cepI mutant was then used as background strain for a whole-genome transposon-insertion mutagenesis strategy, allowing the identification of 20 QS-controlled genes, corresponding to 17 loci. The main functions identified are linked to antifungal and antimicrobial properties, as we have identified QS-controlled genes implicated in the prodn. of pyrrolnitrin, burkholdines (occidiofungin-like mols.), and enacyloxins. This study provides insights in the QS-regulated functions of a PGPR, which could lead to beneficial potential biotechnol. applications

Type de document:
Mots-clés libres: Antifungal molecules, Burkholderia, quorum sensing, random mutagenesis, secondary metabolites
Centre: Centre INRS-Institut Armand Frappier
Date de dépôt: 30 avr. 2014 13:40
Dernière modification: 30 avr. 2014 13:40
URI: http://espace.inrs.ca/id/eprint/2194

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