Artículo
Pseudomonas aeruginosa gbdR gene is transcribed from a σ54-dependent promoter under the control of NtrC/CbrB, IHF and BetI
Fecha de publicación:
09/2017
Editorial:
Society for General Microbiology
Revista:
Microbiology-UK
ISSN:
1350-0872
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Pseudomonasaeruginosa uses choline as a source of carbon and nitrogen, and also for the synthesis of glycine betaine, an osmoprotectant under stress conditions such as drought and salinity. The transcription factor GbdR is the specific regulator of choline metabolism and it belongs to the Arac/XylS family of transcriptional regulators. Despite the link between choline catabolism and bacterial pathogenicity, gbdR regulation has not been explored in detail. In the present work, we describe how gbdR transcription can be initiated from a s 54-dependent promoter. gbdR transcription can be activated by NtrC in the absence of a preferential nitrogen source, by CbrB in the absence of a preferential carbon source, and by the integration host factor favouring DNA bending. In addition, we found that BetI negatively regulates gbdR expression in the absence of choline. We identified two overlapping BetI binding sites in the gbdR promoter sequence, providing an additional example of s 54-promoter down-regulation. Based on our findings, we propose a model for gdbR regulation and its impact on choline metabolism.
Palabras clave:
Beti
,
Choline
,
Gbdr
,
Ntrc
,
P. Aeruginosa
,
Rpon
,
Transcriptional Regulation
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Articulos(IHEM)
Articulos de INST. HISTOLOGIA Y EMBRIOLOGIA DE MEND DR.M.BURGOS
Articulos de INST. HISTOLOGIA Y EMBRIOLOGIA DE MEND DR.M.BURGOS
Citación
Sanchez, Diego German; Primo, Emiliano David; Damiani, Maria Elena; Lisa, Angela Teresita; Pseudomonas aeruginosa gbdR gene is transcribed from a σ54-dependent promoter under the control of NtrC/CbrB, IHF and BetI; Society for General Microbiology; Microbiology-UK; 163; 9; 9-2017; 1343-1354
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