NDLI: Growth Phase and Metal-Dependent Transcriptional Regulation of the fecA Genes in Helicobacter pylori ▿

Content Provider	PubMed Central
Author	Danielli, Alberto Romagnoli, Simona Davide, Roncarati Costantino, Lorenzo Delany, Isabel Scarlato, Vincenzo
Abstract	Balancing metal uptake is essential for maintaining a proper intracellular metal concentration. Here, we report the transcriptional control exerted by the two metal-responsive regulators of Helicobacter pylori, Fur (iron-dependent ferric uptake regulator) and NikR (nickel-responsive regulator), on the three copies of the fecA genes present in this species. By monitoring the patterns of transcription throughout growth and in response to nickel, iron, and a metal chelator, we found that the expression of the three fecA genes is temporally regulated, responds to metals in different ways, and is selectively controlled by either one of the two regulators. fecA1 is expressed at a constant level throughout growth, and its expression is iron sensitive; the expression of fecA2 is mainly off, with minor expression coming up in late exponential phase. In contrast, the expression of fecA3 is maximal in early exponential phase, gradually decreases with time, and is repressed by nickel. The direct roles of Fur and NikR were studied both in vitro, by mapping the binding sites of each regulator on the promoter regions via DNase I footprinting analysis, and in vivo, by using primer extension analyses of the fecA transcripts in fur and nikR deletion strains. Overall, the results show that the expression of each fecA gene is finely tuned in response to metal availability, as well as during the bacterial growth phase, suggesting specific and dedicated functions for the three distinct FecA homologues.
Related Links	http://dx.doi.org/10.1128/jb.01741-08
Ending Page	3725
Page Count	9
Starting Page	3717
File Format	PDF
ISSN	00219193
e-ISSN	10985530
Journal	Journal of Bacteriology
Issue Number	11
Volume Number	191
Language	English
Publisher	American Society for Microbiology (ASM)
Publisher Date	2009-06-01
Access Restriction	Open
Rights Holder	American Society for Microbiology (ASM)
Subject Keyword	Molecular Biology Microbiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Biology Microbiology

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