Expression of the nir and nor genes for denitrification of Pseudomonas aeruginosa requires a novel CRP/FNR-related transcriptional regulator, DNR, in addition to ANR

FEBS Lett. 1995 Aug 28;371(1):73-6. doi: 10.1016/0014-5793(95)00885-d.


A gene, designated dnr, was identified in the vicinity of the structural genes for nitrite reductase (nirS) and nitric oxide reductase (norCB), and the gene for activation of the reductases (nirQ) from Pseudomonas aeruginosa. It encodes a protein of 227 amino acids homologous with the CRP/FNR-family transcriptional regulators. Promoter activities for nirS, nirQ and norCB were considerably reduced in the dnr mutant as well as in the mutant of anr, the other fnr-like regulatory gene from P. aeruginosa. This is the first finding that two CRP/FNR-related regulators are involved in denitrification in one strain.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Proteins / genetics*
  • Cloning, Molecular
  • DNA-Binding Proteins*
  • Escherichia coli Proteins*
  • Gene Expression Regulation, Bacterial / genetics*
  • Genes, Bacterial / genetics
  • Iron-Sulfur Proteins*
  • Molecular Sequence Data
  • Multigene Family / genetics
  • Mutation
  • Nitrite Reductases / genetics*
  • Oxidoreductases / genetics*
  • Phylogeny
  • Promoter Regions, Genetic / genetics
  • Pseudomonas aeruginosa / enzymology
  • Pseudomonas aeruginosa / genetics*
  • Restriction Mapping
  • Sequence Analysis, DNA
  • Sequence Homology, Amino Acid
  • Trans-Activators*
  • Transcription Factors / genetics*


  • Bacterial Proteins
  • DNA-Binding Proteins
  • DNR protein, Pseudomonas aeruginosa
  • Escherichia coli Proteins
  • FNR protein, E coli
  • Iron-Sulfur Proteins
  • Trans-Activators
  • Transcription Factors
  • nirQ protein, Pseudomonas
  • ANR protein, Pseudomonas aeruginosa
  • Oxidoreductases
  • Nitrite Reductases
  • nitric-oxide reductase

Associated data

  • GENBANK/D50019