title: Identification of quorum sensing-controlled genes in Burkholderia ambifaria.
abstract: 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 molecule N-octanoylhomoserine lactone (C8 -HSL), was inactivated. Phenotypes of the B. ambifaria cepI mutant we observed, such as increased production 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 production of pyrrolnitrin, burkholdines (occidiofungin-like molecules), and enacyloxins. This study provides insights in the QS-regulated functions of a PGPR, which could lead to beneficial potential biotechnological applications.
authors: INRS-Institut Armand-Frappier, 531 bd des Prairies, Laval, Quebec H7V 1B7, Canada.
authors: Annelise
authors: A
authors: Chapalain
authors: Ludovic
authors: L
authors: Vial
authors: Natacha
authors: N
authors: Laprade
authors: Valérie
authors: V
authors: Dekimpe
authors: Jonathan
authors: J
authors: Perreault
authors: Eric
authors: E
authors: Déziel
mesh_terms: D000818:Animals; D000935:Antifungal Agents / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D042602:Burkholderia cepacia complex / Q000235:genetics* / Q000472:pathogenicity*; D019295:Computational Biology; D004330:Drosophila / Q000382:microbiology; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D008025:Ligases / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D011764:Pyrrolnitrin / Q000096:biosynthesis; D053038:Quorum Sensing / Q000235:genetics*; D017262:Siderophores / Q000096:biosynthesis; D014774:Virulence; D001616:beta-Galactosidase / Q000235:genetics / Q000378:metabolism
chemical_list: D000935:Antifungal Agents; D001426:Bacterial Proteins; C117246:CepR protein, Burkholderia; D017262:Siderophores; D001616:beta-Galactosidase; D008025:Ligases; C449816:N-acylhomoserine lactone synthase; D011764:Pyrrolnitrin
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