Abstract:
:The transcriptional regulator Spx plays a key role in maintaining the redox homeostasis of Bacillus subtilis cells exposed to disulfide stress. Defects in Spx were previously shown to lead to differential expression of numerous genes but direct and indirect regulatory effects could not be distinguished. Here we identified 283 discrete chromosomal sites potentially bound by the Spx-RNA polymerase (Spx-RNAP) complex using chromatin immunoprecipitation of Spx. Three quarters of these sites were located near Sigma(A)-dependent promoters, and upon diamide treatment, the fraction of the Spx-RNAP complex increased in parallel with the number and occupancy of DNA sites. Correlation of Spx-RNAP-binding sites with gene differential expression in wild-type and Δspx strains exposed or not to diamide revealed that 144 transcription units comprising 275 genes were potentially under direct Spx regulation. Spx-controlled promoters exhibited an extended -35 box in which nucleotide composition at the -43/-44 positions strongly correlated with observed activation. In vitro transcription confirmed activation by oxidized Spx of seven newly identified promoters, of which one was also activated by reduced Spx. Our study globally characterized the Spx regulatory network, revealing its role in the basal expression of some genes and its complex interplay with other stress responses.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Rochat T,Nicolas P,Delumeau O,Rabatinová A,Korelusová J,Leduc A,Bessières P,Dervyn E,Krásny L,Noirot Pdoi
10.1093/nar/gks755subject
Has Abstractpub_date
2012-10-01 00:00:00pages
9571-83issue
19eissn
0305-1048issn
1362-4962pii
gks755journal_volume
40pub_type
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