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Journal of Bacteriology, February 2008, p. 1335-1343, Vol. 190, No. 4
0021-9193/08/$08.00+0     doi:10.1128/JB.01764-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Differential Regulation of High-Affinity Phosphate Transport Systems of Mycobacterium smegmatis: Identification of PhnF, a Repressor of the phnDCE Operon{triangledown}

Susanne Gebhard and Gregory M. Cook*

Department of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, P.O. Box 56, Dunedin, New Zealand

Received 6 November 2007/ Accepted 6 December 2007

The uptake of phosphate into the cell via high-affinity, phosphate-specific transport systems has been studied with several species of mycobacteria. All of these species have been shown to contain several copies of such transport systems, which are synthesized in response to phosphate limitation. However, the mechanisms leading to the expression of the genes encoding these transporters have not been studied. This study reports on the investigation of the regulation of the pstSCAB and the phnDCE operons of Mycobacterium smegmatis. The phn locus contains an additional gene, phnF, encoding a GntR-like transcriptional regulator. Expression analyses of a phnF deletion mutant demonstrated that PhnF acts as a repressor of the phnDCE operon but does not affect the expression of pstSCAB. The deletion of pstS, which is thought to cause the constitutive expression of genes regulated by the two-component system SenX3-RegX3, led to the constitutive expression of the transcriptional fusions pstS-lacZ, phnD-lacZ, and phnF-lacZ, suggesting that phnDCE and phnF are conceivably new members of the SenX3-RegX3 regulon of M. smegmatis. Two presumptive binding sites for PhnF in the intergenic region between phnD and phnF were identified and shown to be required for the repression of phnD and phnF, respectively. We propose a model in which the transcription of pstSCAB is controlled by the two-component SenX3-RegX3 system, while phnDCE and phnF are subject to dual control by SenX3-RegX3 and PhnF.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, Otago School of Medical Sciences, University of Otago, P.O. Box 56, Dunedin, New Zealand. Phone: 64 3 479 7722. Fax: 64 3 479 8540. E-mail: greg.cook{at}stonebow.otago.ac.nz

{triangledown} Published ahead of print on 14 December 2007.

Journal of Bacteriology, February 2008, p. 1335-1343, Vol. 190, No. 4
0021-9193/08/$08.00+0     doi:10.1128/JB.01764-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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