N-oxide sensing in Pseudomonas aeruginosa: expression and preliminary characterization of DNR, an FNR-CRP type transcriptional regulator

In denitrifying bacteria, the concentration of NO is maintained low by a tight control of the expression and activity of nitrite and NO reductases. Regulation involves redox-linked transcription factors, such as those belonging to the CRP-FNR (cAMP receptor protein-fumarate and nitrate reductase reg...

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Bibliographic Details
Published inBiochemical Society transactions Vol. 33; no. Pt 1; p. 184
Main Authors Rinaldo, S, Giardina, G, Brunori, M, Cutruzzolà, F
Format Journal Article
LanguageEnglish
Published England 01.02.2005
Subjects
Anilino Naphthalenesulfonates - metabolism
Bacterial Proteins - genetics
Cloning, Molecular
Electrophoresis, Polyacrylamide Gel
Genes, Bacterial
Oxides - metabolism
Pseudomonas aeruginosa - genetics
Pseudomonas aeruginosa - metabolism
Transcription Factors - genetics
Transcription Factors - metabolism
Transcription, Genetic
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Summary:In denitrifying bacteria, the concentration of NO is maintained low by a tight control of the expression and activity of nitrite and NO reductases. Regulation involves redox-linked transcription factors, such as those belonging to the CRP-FNR (cAMP receptor protein-fumarate and nitrate reductase regulator) superfamily, which act as oxygen and N-oxide sensors. Given that few members of this superfamily have been characterized in detail, we have cloned, expressed and purified the dissimilative nitrate respiration regulator from Pseudomonas aeruginosa. To gain insights on the structural properties of the dissimilative nitrate respiration regulator, we have also determined the aggregation state of the purified protein and its ability to bind hydrophobic compounds such as 8-anilino-1-naphthalenesulphonic acid.
ISSN:0300-5127
DOI:10.1042/BST0330184