PMID:11169114
| Citation |
Marshall, FA, Messenger, SL, Wyborn, NR, Guest, JR, Wing, H, Busby, SJ and Green, J (2001) A novel promoter architecture for microaerobic activation by the anaerobic transcription factor FNR. Mol. Microbiol. 39:747-53 |
|---|---|
| Abstract |
The yfiD gene of Escherichia coli has an unusual promoter architecture in which an FNR dimer located at -93.5 inhibits transcription activation mediated by another FNR dimer bound at the typical class II position (-40.5). In vitro transcription from the yfiD promoter indicated that FNR alone can downregulate yfiD expression. Analysis of yfiD::lac reporters showed that five turns of the DNA helix between FNR sites was optimal for downregulation. FNR heterodimers, in which one subunit carried a defective repression surface, revealed that the upstream subunit of the -40.5 dimer and the downstream subunit of the -93.5 dimer were most important for downregulating yfiD expression. Deletion of the C-terminal domain of the alpha-subunit of RNA polymerase (RNAP) did not affect FNR-mediated repression, suggesting that repression is mediated through FNR-FNR and not FNR-RNAP interactions. Maximum yfiD::lac expression was observed in cultures exposed to 10 microM oxygen. More or less oxygen reduced expression dramatically. This pattern of response was dependent on the combination of a high-affinity site at the activating class II position and a lower affinity site at the upstream position. |
| Links | |
| Keywords |
Aerobiosis; Anaerobiosis; Bacterial Proteins/genetics; Bacterial Proteins/metabolism; Base Sequence; Culture Media; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli/metabolism; Escherichia coli Proteins; Gene Expression Regulation, Bacterial/genetics; Iron-Sulfur Proteins/genetics; Molecular Sequence Data; Oxygen/pharmacology; Promoter Regions, Genetic/genetics; Transcription, Genetic; Transcriptional Activation |
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