Reference : The FurA regulon in Anabaena sp. PCC 7120: in silico prediction and experimental vali...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/10993/16671
The FurA regulon in Anabaena sp. PCC 7120: in silico prediction and experimental validation of novel target genes.
English
Gonzalez, Andres [> >]
Espinosa Angarica, Vladimir mailto [University of Luxembourg > Luxembourg Centre for Systems Biomedicine (LCSB) >]
Sancho, Javier [> >]
Fillat, Maria F. [> >]
2014
Nucleic acids research
42
8
4833-46
Yes (verified by ORBilu)
International
0305-1048
1362-4962
England
[en] FUR regulon ; TF-binding-site prediction ; iron homeostasis
[en] In the filamentous cyanobacterium Anabaena sp. PCC 7120, the ferric uptake regulator FurA functions as a global transcriptional regulator. Despite several analyses have focused on elucidating the FurA-regulatory network, the number of target genes described for this essential transcription factor is limited to a handful of examples. In this article, we combine an in silico genome-wide predictive approach with experimental determinations to better define the FurA regulon. Predicted FurA-binding sites were identified upstream of 215 genes belonging to diverse functional categories including iron homeostasis, photosynthesis and respiration, heterocyst differentiation, oxidative stress defence and light-dependent signal transduction mechanisms, among others. The probabilistic model proved to be effective at discerning FurA boxes from non-cognate sequences, while subsequent electrophoretic mobility shift assay experiments confirmed the in vitro specific binding of FurA to at least 20 selected predicted targets. Gene-expression analyses further supported the dual role of FurA as transcriptional modulator that can act both as repressor and as activator. In either role, the in vitro affinity of the protein to its target sequences is strongly dependent on metal co-regulator and reducing conditions, suggesting that FurA couples in vivo iron homeostasis and the response to oxidative stress to major physiological processes in cyanobacteria.
Researchers ; Students
http://hdl.handle.net/10993/16671
10.1093/nar/gku123
http://nar.oxfordjournals.org/content/42/8/4833.long

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