The effect of mutation in the clpX gene on the synthesis of N-acyl-homoserine lactones and other properties of Burkholderia cenocepacia 370

In order to study the regulation of N-acyl-homoserine lactones synthesis (AHLs, the signal molecules of Quorum Sensing regulation) in Burkholderia cenocepacia strain 370 we obtained mutants with increased AHL production. One of the mutants, named BC-B6, was obtained by TnMod-RKmr plasposon mutagenes...

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Bibliographic Details
Published in:Microbiological research 2016-05, Vol.186-187, p.90-98
Main Authors: Veselova, M.A., Romanova, Yu. M., Lipasova, V.A., Koksharova, O.A., Zaitseva, Yu. V., Chernukha, M.U., Gintsburg, A.L., Khmel, I.A.
Format: Article
Language:English
Subjects:
Acyl-Butyrolactones - metabolism
Adenosine Triphosphatases - genetics
Adenosine Triphosphatases - metabolism
Animals
Burkholderia
Burkholderia cenocepacia
Burkholderia cenocepacia - genetics
Burkholderia cenocepacia - metabolism
Burkholderia Infections - microbiology
Burkholderia Infections - pathology
ClpX ATPase
Disease Models, Animal
Locomotion
Mice
Mutagenesis, Insertional
Mutants
Mutation
Proteome - analysis
Quorum sensing regulation
Virulence Factors - genetics
Virulence Factors - metabolism
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Summary:In order to study the regulation of N-acyl-homoserine lactones synthesis (AHLs, the signal molecules of Quorum Sensing regulation) in Burkholderia cenocepacia strain 370 we obtained mutants with increased AHL production. One of the mutants, named BC-B6, was obtained by TnMod-RKmr plasposon mutagenesis. The plasposon insertion was located within the clpX gene encoding the ATPase subunit ClpX of the ClpXP protease. The mutation reduced bacterial virulence in mice intranasal infection. The results of proteomic analysis demonstrated that the expression of at least 19 proteins differed not less than 2-fold between the parental and mutant strains. 18 of the proteins were upregulated in the mutant, and one protein was downregulated. The proteins included those that involved in protein synthesis and modification, in energy production, in general metabolism, in transport and regulation. To check the effect of the clpX mutation on the AHL synthesis, a mutant with inactivated clpX gene (BC-clpX:Kmr) was constructed by gene replacement method. This mutant also exhibited increased AHLs production. A swarming motility of both mutants was reduced compared to the original strain. Thus, the obtained results show that the clpX gene was involved in the regulation of AHL production and a number of cellular processes in B. cenocepacia 370.
ISSN:0944-5013
1618-0623
DOI:10.1016/j.micres.2016.03.009