NDLI: Architecture of divergent flagellar promoters controlled by CtrA in Rhodobacter sphaeroides

Content Provider	Springer Nature : BioMed Central
Author	Rivera-Osorio, Anet Osorio, Aurora Poggio, Sebastian Dreyfus, Georges Camarena, Laura
Abstract	Background Rhodobacter sphaeroides has two sets of flagellar genes, fla1 and fla2, that are responsible for the synthesis of two different flagellar structures. The expression of the fla2 genes is under control of CtrA. In several α-proteobacteria CtrA is also required for the expression of the flagellar genes, but the architecture of CtrA-dependent promoters has only been studied in detail in Caulobacter crescentus. In many cases the expression of fla genes originates from divergent promoters located a few base pairs apart, suggesting a particular arrangement of the cis-acting sites. Results Here we characterized several control regions of the R. sphaeroides fla2 genes and analyzed in detail two regions containing the divergent promoters flgB2p-fliI2p, and fliL2p-fliF2p. Binding sites for CtrA of these promoters were identified in silico and tested by site directed mutagenesis. We conclude that each one of these promoter regions has a particular arrangement, either a single CtrA binding site for activation of fliL2p and fliF2p, or two independent sites for activation of flgB2p and fliI2p. ChIP experiments confirmed that CtrA binds to the control region containing the flgB2 and fliI2 promoters, supporting the notion that CtrA directly controls the expression of the fla2 genes. The flgB and fliI genes are syntenic and show a short intercistronic region in closely related bacterial species. We analyzed these regions and found that the arrangement of the CtrA binding sites varies considerably. Conclusions The results in this work reveal the arrangement of the fla2 divergent promoters showing that CtrA promotes transcriptional activation using more than a single architecture.
Related Links	https://bmcmicrobiol.biomedcentral.com/counter/pdf/10.1186/s12866-018-1264-y.pdf
Ending Page	14
Page Count	14
Starting Page	1
File Format	HTM / HTML
ISSN	14712180
DOI	10.1186/s12866-018-1264-y
Journal	BMC Microbiology
Issue Number	1
Volume Number	18
Language	English
Publisher	BioMed Central
Publisher Date	2018-10-10
Access Restriction	Open
Subject Keyword	Microbiology Biological Microscopy Mycology Parasitology Virology Life Sciences Rhodobacter sphaeroides CtrA Bacterial flagellum Divergent promoters
Content Type	Text
Resource Type	Article
Subject	Microbiology Microbiology (medical)
Journal Impact Factor	4/2023
5-Year Journal Impact Factor	4.6/2023

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