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. 1988 Feb;85(4):1023–1027. doi: 10.1073/pnas.85.4.1023

Anaerobic induction of Escherichia coli formate dehydrogenase (hydrogenase-linked) is enhanced by gyrase inactivation.

M J Axley 1, T C Stadtman 1
PMCID: PMC279693  PMID: 2829213

Abstract

Escherichia coli synthesizes a hydrogenase-linked formate dehydrogenase (FDHH) under anaerobic conditions in the absence of nitrate. In striking contrast to many other anaerobic-specific genes, which require DNA to be negatively supercoiled for expression, we have found that inhibition of DNA gyrase activity enhances expression from the gene (fdhF) encoding the selenopolypeptide of FDHH. Fusions of the 5' flanking region of fdhF and the structural gene of lacZ were used to determine fdhF expression under varying conditions. Chemical inhibitors and a temperature-sensitive mutant allowed in vivo inhibition of gyrase activity. In each case, concomitant with gyrase inhibition there was a substantial increase in the induction of fusion protein synthesis. This enhancement of expression is observed for the intact fdhF gene residing on the chromosome as well as the fusion gene in a multicopy plasmid. Inhibition of gyrase activity will partially overcome the inhibition of fdhF expression due to nitrate but does not allow fusion protein synthesis in the presence of oxygen.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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