DNA binding properties of the Escherichia coli nitric oxide sensor NorR: towards an understanding of the regulation of flavorubredoxin expression.

Abstract:

:Nitric oxide is an intermediate of denitrification, and is one of the radical species deployed by macrophages against invading pathogens, therefore bacterial responses to NO are of considerable importance. The Escherichia coli flavorubredoxin and its associated oxidoreductase reduce NO to nitrous oxide under anaerobic conditions, and are encoded by the norVW transcription unit. Expression of norVW requires the NO sensing regulatory protein NorR and is dependent on RNA polymerase containing the alternative sigma factor, sigma(54). We have purified NorR and shown that it binds to three sites in the norVW promoter region, located 75-140 bp upstream of the experimentally verified transcription start site. We have also identified two binding sites for the integration host factor, one between the NorR sites and the sigma(54)-RNA polymerase binding site, and a second downstream of the norVW transcription start site. Comparison of the norVW promoters of enteric bacteria along with known and putative NorR-regulated promoters from Vibrio, Ralstonia and Pseudomonas species suggests that NorR binding sites contain an invariant GT(N7)AC motif flanking an AT-rich central region. The identification of a consensus for NorR binding sites will help to elucidate additional members of the NorR regulon.

journal_name

Biochem Soc Trans

authors

Tucker N,D'autréaux B,Spiro S,Dixon R

doi

10.1042/BST0330181

keywords:

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

181-3

issue

Pt 1

eissn

0300-5127

issn

1470-8752

pii

BST0330181

journal_volume

33

pub_type

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