Journal
BIOCHEMICAL SOCIETY TRANSACTIONS
Volume 33, Issue -, Pages 181-183Publisher
PORTLAND PRESS LTD
DOI: 10.1042/BST0330181
Keywords
DNA footprinting; flavorubredoxin; NO sensor; NorR; sigma(54)-dependent activator
Categories
Funding
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000016] Funding Source: researchfish
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000016] Funding Source: Medline
Ask authors/readers for more resources
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 75140 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 Pseudomoncis 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available