Research Library

Premium FNR‐dependent repression of the ndh gene of Escherichia coli and metal ion requirement for FNR‐regulated gene expression
Spiro S.,
Roberts R. E.,
Guest J. R.
Publication year1989
Publication title
molecular microbiology
Resource typeJournals
PublisherBlackwell Publishing Ltd
Summary The ndh gene of Escherichia coli which encodes an NADH dehydrogenase contains a putative FNR‐binding site in its upstream non‐coding region, and its expression has been investigated using an ndh‐lacZ fusion. Expression of the fusion was found to be reduced during anaerobic growth, and experiments with hosts containing an fnr mutation and/or a multicopy fnr + plasmid indicated that the anaerobic repression of the ndh gene is mediated by the FNR protein. Thus FNR can function as an anaerobic repressor as well as an anaerobic transcriptional activator. The results are consistent with the FNR‐binding function attributed to the proposed consensus sequence. Using frdA ‐and ndh‐lacZ fusions exhibiting positive and negative regulation by FNR, it was further shown that the depletion of metal ions in growth media with chelating agents mimics oxygen with respect to the activity of FNR. Possible roles for metal ions in the oxygen‐sensing pathway associated with FNR function are discussed.
Subject(s)activator (genetics) , biochemistry , biology , escherichia coli , gene , gene expression , lac operon , microbiology and biotechnology , psychological repression , repressor
SCImago Journal Rank1.857

Seeing content that should not be on Zendy? Contact us.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here