title: The effect of mutation in the clpX gene on the synthesis of N-acyl-homoserine lactones and other properties of Burkholderia cenocepacia 370.
abstract: 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-RKm(r) 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:Km(r)) 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.
authors.affiliation: Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 2, Moscow 123182, Russia.
authors.forename: M A
authors.initials: MA
authors.lastname: Veselova
authors.affiliation: The Gamaleya Scientific Research Centre of Epidemiology and Microbiology, Gamaleya Str. 18, Moscow 123098, Russia.
authors.forename: Yu M
authors.initials: YM
authors.lastname: Romanova
authors.affiliation: Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 2, Moscow 123182, Russia.
authors.forename: V A
authors.initials: VA
authors.lastname: Lipasova
authors.affiliation: Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 2, Moscow 123182, Russia; M.V. Lomonosov Moscow State University, A.N. Belozersky Institute of Physico-Chemical Biology, Leninskie Gory 1-40, Moscow 119991, Russia.
authors.forename: O A
authors.initials: OA
authors.lastname: Koksharova
authors.affiliation: Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 2, Moscow 123182, Russia.
authors.forename: Yu V
authors.initials: YV
authors.lastname: Zaitseva
authors.affiliation: The Gamaleya Scientific Research Centre of Epidemiology and Microbiology, Gamaleya Str. 18, Moscow 123098, Russia.
authors.forename: M U
authors.initials: MU
authors.lastname: Chernukha
authors.affiliation: The Gamaleya Scientific Research Centre of Epidemiology and Microbiology, Gamaleya Str. 18, Moscow 123098, Russia.
authors.forename: A L
authors.initials: AL
authors.lastname: Gintsburg
authors.affiliation: Institute of Molecular Genetics, Russian Academy of Sciences, Kurchatov Square 2, Moscow 123182, Russia. Electronic address: khmel@img.ras.ru.
authors.forename: I A
authors.initials: IA
authors.lastname: Khmel
mesh_terms: D054742:Acyl-Butyrolactones / Q000378:metabolism*; D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D019121:Burkholderia Infections / Q000382:microbiology / Q000473:pathology; D057508:Burkholderia cenocepacia / Q000235:genetics / Q000378:metabolism*; D004195:Disease Models, Animal; D008124:Locomotion; D051379:Mice; D016254:Mutagenesis, Insertional; D009154:Mutation; D020543:Proteome / Q000032:analysis; D037521:Virulence Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D054742:Acyl-Butyrolactones; D020543:Proteome; D037521:Virulence Factors; D000251:Adenosine Triphosphatases
keywords: Burkholderia cenocepacia; ClpX ATPase; Mutants; Quorum sensing regulation