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Volume 157, Issue 6

Function of the bacteriophytochrome BphP in the RpoS/Las quorum-sensing network of Free

Abstract

The bacterial phytochrome of (BphP) is an -active red/far-red light sensor histidine kinase of a two-component regulatory system. Despite solid biochemical data, its function in this heterotrophic, opportunistic pathogen is still unknown. Previous studies established that the genes encoding the two necessary phytochrome components BphO, a chromophore-producing haem oxygenase, and BphP, the apo-phytochrome, are co-transcribed in a bicistronic operon. Transcription has been shown to be induced in the stationary phase and to be dependent on the alternative sigma factor RpoS. Here we show an additional regulation of expression through the quorum-sensing (QS) regulator LasR. This regulation is also reflected in a combination of expression profile experiments and proteome analyses of wild-type and phytochrome-deficient strains. While BphP has a pleiotropic effect on global gene expression, 66 % of the downregulated genes in the phytochrome mutant display a link to the Las QS system. Most of these genes seem to be indirectly regulated by LasR through BphP and the unknown response regulator BphR. A model of phytochrome function within the Las QS network is presented.

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  • Accepted:
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  • Published Online:
Funding
This study was supported by the:
  • Deutsche Forschungsgemeinschaft
© 2011 SGM
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2011-06-01
2024-04-19
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Function of the bacteriophytochrome BphP in the RpoS/Las quorum-sensing network of Pseudomonas aeruginosa
Microbiology 157, 1651 (2011); https://doi.org/10.1099/mic.0.049007-0
/content/journal/micro/10.1099/mic.0.049007-0
/content/journal/micro/10.1099/mic.0.049007-0
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