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Pseudomonas aeruginosa gbdR gene is transcribed from a 54-dependent promoter under the control of NtrC/CbrB, IHF and BetI Authors: Diego Germán Sánchez (/search? value1=Diego+Germ%C3%A1n+S%C3%A1nchez&option1=author&noRedirect=true)1,2,†, Emiliano David Primo (/search?value1=Emiliano+David+Primo&option1=author&noRedirect=true)1,†, María Teresa Damiani (/search? value1=Mar%C3%ADa+Teresa+Damiani&option1=author&noRedirect=true)2, Angela Teresita Lisa (/search? value1=Angela+Teresita+Lisa&option1=author&noRedirect=true)1 VIEW AFFILIATIONS *Correspondence: Diego Germán Sánchez,
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First Published Online: 09 August 2017, Microbiology 163: 1343-1354, doi: (Digital Object Identifier) 10.1099/mic.0.000502 (https://dx.doi.org/10.1099/mic.0.000502) Subject: Regulation
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Received: 03/03/2017 Accepted: 16/06/2017 Cover date: 01/09/2017 Abstract
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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 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
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overlapping BetI binding sites in the gbdR promoter sequence, providing an additional example of 54-promoter down-regulation. Based on our findings, we propose a model for gdbR regulation and its impact on choline metabolism.
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† These authors contributed equally to this work. Two supplementary figures and one supplementary table are available with the online Supplementary Material. Keyword(s): BetI (/search?value1=%27BetI%27&option1=pub_keyword), RpoN (/search? value1=%27RpoN%27&option1=pub_keyword), P. aeruginosa (/search?value1=%27P.+aeruginosa%27&option1=pub_keyword), transcriptional regulation (/search?value1=%27transcriptional+regulation%27&option1=pub_keyword), choline (/search? value1=%27choline%27&option1=pub_keyword), gbdR (/search?value1=%27gbdR%27&option1=pub_keyword), NtrC (/search? value1=%27NtrC%27&option1=pub_keyword)
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