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Regulation of the ndh gene of Escherichia coli by integration host factor and a novel regulator, Arr
- Source :
- Microbiology. 143:2865-2875
- Publication Year :
- 1997
- Publisher :
- Microbiology Society, 1997.
-
Abstract
- Summary: The ndh gene of Escherichia coli encodes the non-proton-translocating NADH dehydrogenase II. Expression of the ndh gene is subject to a complex network of regulatory controls at the transcriptional level. Under anaerobic conditions ndh is repressed by the regulator of fumarate and nitrate reduction (FNR). However, in the absence of FNR, ndh expression is activated by the amino acid response regulator (Arr) during anaerobic growth in rich medium. Expression of the ndh gene varies during the growth cycle in response to the intracellular concentration of the heat-stable DNA-binding protein, Fis. In this work two additional heat-stable proteins, integration host factor (IHF) and the histone-like protein HU were found to interact with the ndh promoter. IHF was shown to bind at three sites centred at +26, -17 and -58 in the ndh promoter (K d = 10−8 M), to prevent open-complex formation and to repress ndh transcription in vitro. Studies with an ndh-lacZ fusion confirmed that IHF represses ndh expression in vivo. Two putative binding sites for Arr, which overlap the two FNR boxes in the ndh promoter, were identified. Studies with the FNR-activated and amino-acid-inducible asparaginase II gene (ansB) showed that IHF and a component of the Arr-containing fraction (but not HU) interact with the corresponding ansB promoter.
- Subjects :
- DNA, Bacterial
Integration Host Factors
Iron-Sulfur Proteins
medicine.disease_cause
Microbiology
Bacterial Proteins
Transcription (biology)
Gene expression
Escherichia coli
Transcriptional regulation
medicine
Asparaginase
Amino Acid Sequence
Amino Acids
Binding site
Promoter Regions, Genetic
Gene
Binding Sites
Base Sequence
biology
Escherichia coli Proteins
NADH dehydrogenase
NADH Dehydrogenase
Molecular biology
Response regulator
Genes, Bacterial
biology.protein
Subjects
Details
- ISSN :
- 14652080 and 13500872
- Volume :
- 143
- Database :
- OpenAIRE
- Journal :
- Microbiology
- Accession number :
- edsair.doi.dedup.....6e6f77e21539648387a35bea382340c9