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Journal of Bacteriology, April 2007, p. 3006-3016, Vol. 189, No. 8
0021-9193/07/$08.00+0     doi:10.1128/JB.01544-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Expression of the bviIR and cepIR Quorum-Sensing Systems of Burkholderia vietnamiensis{triangledown}

Rebecca J. Malott and Pamela A. Sokol*

Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Center, Calgary, Alberta, Canada T2N 4N1

Received 3 October 2006/ Accepted 29 January 2007

Burkholderia vietnamiensis has both the cepIR quorum-sensing system that is widely distributed among the Burkholderia cepacia complex (BCC) and the bviIR system. Comparison of the expression of cepI, cepR, bviI, and bviR-luxCDABE fusions in B. vietnamiensis G4 and the G4 cepR and bviR mutants determined that the expression of bviI requires both a functional cognate regulator, BviR, and functional CepR. The cepIR system, however, is not regulated by BviR. Unlike the cepIR genes in other BCC species, the cepIR genes are not autoregulated in G4. N-Acyl-homoserine lactone (AHL) production profiles in G4 cepI, cepR, bviI, and bviR mutants confirmed the regulatory organization of the G4 quorum-sensing systems. The regulatory network in strain PC259 is similar to that in G4, except that CepR positively regulates cepI and negatively regulates cepR. AHL production and the bviI expression levels in seven B. vietnamiensis isolates were compared. All strains produced N-octanoyl-homoserine lactone and N-hexanoyl-homoserine lactone; however, only one of four clinical strains but all three environmental strains produced the BviI synthase product, N-decanoyl-homoserine lactone (DHL). The three strains that did not produce DHL expressed bviR but not bviI. Heterologous expression of bviR restored DHL production in these strains. The bviIR loci of the non-DHL-producing strains were sequenced to confirm that bviR encodes a functional transcriptional regulator. Lack of expression of G4 bviI in these three strains indicated that an additional regulatory element may be involved in the regulation of bviIR expression in certain strains of B. vietnamiensis.

* Corresponding author. Mailing address: Department of Microbiology and Infectious Diseases, University of Calgary Health Sciences Centre, 3330 Hospital Dr. N.W., Calgary, Alberta, Canada T2N 4N1. Phone: (403) 220-6037. Fax: (403) 270-2772. E-mail: psokol{at}ucalgary.ca

{triangledown} Published ahead of print on 2 February 2007.

Journal of Bacteriology, April 2007, p. 3006-3016, Vol. 189, No. 8
0021-9193/07/$08.00+0     doi:10.1128/JB.01544-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Malott, R. J., O'Grady, E. P., Toller, J., Inhulsen, S., Eberl, L., Sokol, P. A. (2009). A Burkholderia cenocepacia Orphan LuxR Homolog Is Involved in Quorum-Sensing Regulation. J. Bacteriol. 191: 2447-2460 [Abstract] [Full Text]  
  • Van Nostrand, J. D., Arthur, J. M., Kilpatrick, L. E., Neely, B. A., Bertsch, P. M., Morris, P. J. (2008). Changes in protein expression in Burkholderia vietnamiensis PR1301 at pH 5 and 7 with and without nickel. Microbiology 154: 3813-3824 [Abstract] [Full Text]  


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