AmrZ is a global transcriptional regulator implicated in iron uptake and environmental adaption in P. fluorescens F113

BMC Genomics

Rafael Rivilla¹  Marta Martín¹  Pilar Vesga¹  Miguel Redondo-Nieto¹  Francisco Martínez-Granero¹ 

[1] Departamento de Biología, Universidad Autónoma de Madrid, C/Darwin, 2. 28049 Madrid Spain

关键词: ChIP-seq;    Pseudomonas;    Iron;    Transcriptional regulator;    AmrZ;   

Others  :  1217625
DOI  :  10.1186/1471-2164-15-237

 received in 2013-10-03, accepted in 2014-03-21,  发布年份 2014

【 摘 要 】

Background

AmrZ, a RHH transcriptional regulator, regulates motility and alginate production in pseudomonads. Expression of amrZ depends on the environmental stress sigma factor AlgU. amrZ and algU mutants have been shown to be impaired in environmental fitness in different pseudomonads with different lifestyles. Considering the importance of AmrZ for the ecological fitness of pseudomonads and taking advantage of the full sequencing and annotation of the Pseudomonas fluorescens F113 genome, we have carried out a ChIP-seq analysis from a pool of eight independent ChIP assays in order to determine the AmrZ binding sites and its implication in the regulation of genes involved in environmental adaption.

Results

154 enriched regions (AmrZ binding sites) were detected in this analysis, being 76% of them located in putative promoter regions. 18 of these peaks were validated in an independent ChIP assay by qPCR. The 154 peaks were assigned to genes involved in several functional classes such as motility and chemotaxis, iron homeostasis, and signal transduction and transcriptional regulators, including genes encoding proteins implicated in the turn-over of c-diGMP. A putative AmrZ binding site was also observed by aligning the 154 regions with the MEME software. This motif was present in 75% of the peaks and was similar to that described in the amrZ and algD promoters in P. aeruginosa. We have analyzed the role of AmrZ in the regulation of iron uptake genes, to find that AmrZ represses their expression under iron limiting conditions.

Conclusions

The results presented here show that AmrZ is an important global transcriptional regulator involved in environmental sensing and adaption. It is also a new partner in the complex iron homeostasis regulation.

【 授权许可】

   
2014 Martínez-Granero et al.; licensee BioMed Central Ltd.

【 图 表 】

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