Article
Ammonium repression of the nitrite-nitrate (nasAB) assimilatory operon of Azotobacter vinelandii is enhanced in mutants expressing the nifO gene at high levels.
Molecular & general genetics : MGG - 1 Jun 1997
Gutierrez J C, Santero E, Tortolero M
Abstract excerpt
A number of Tn5 mutants were isolated which were unable to fix nitrogen and showed enhanced ammonium repression of the nitrate/nitrite assimilation genes. They also had reduced nitrate reductase activity under fully inducing conditions. Insertions were localized within the nifB gene, and inabilit...
Topics
- Azotobacter vinelandii
- Bacterial Proteins
- Chlorates
- Chromosome Mapping
- Chromosomes, Bacterial
- DNA Transposable Elements
- Drug Resistance, Microbial
- Gene Expression Regulation, Bacterial
- Genes, Bacterial
- Mutation
- Nitrate Reductase
- Nitrate Reductases
- Nitrates
- Nitrogen
- Operon
- Quaternary Ammonium Compounds
- Transcription Factors