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PMID:12045829
| Citation |
Ishida, ML, Assumpção, MC, Machado, HB, Benelli, EM, Souza, EM and Pedrosa, FO (2002) Identification and characterization of the two-component NtrY/NtrX regulatory system in Azospirillum brasilense. Braz. J. Med. Biol. Res. 35:651-61 |
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| Abstract |
Two Azospirillum brasilense open reading frames (ORFs) exhibited homology with the two-component NtrY/NtrX regulatory system from Azorhizobium caulinodans. These A. brasilense ORFs, located downstream to the nifR3ntrBC operon, were isolated, sequenced and characterized. The present study suggests that ORF1 and ORF2 correspond to the A. brasilense ntrY and ntrX genes, respectively. The amino acid sequences of A. brasilense NtrY and NtrX proteins showed high similarity to sensor/kinase and regulatory proteins, respectively. Analysis of lacZ transcriptional fusions by the beta-galactosidase assay in Escherichia coli ntrC mutants showed that the NtrY/NtrX proteins failed to activate transcription of the nifA promoter of A. brasilense. The ntrYX operon complemented a nifR3ntrBC deletion mutant of A. brasilense for nitrate-dependent growth, suggesting a possible cross-talk between the NtrY/X and NtrB/C sensor/regulator pairs. Our data support the existence of another two-component regulatory system in A. brasilense, the NtrY/NtrX system, probably involved in the regulation of nitrate assimilation. |
| Links | |
| Keywords |
Amino Acid Sequence; Azospirillum brasilense/genetics; Azospirillum brasilense/growth & development; Azospirillum brasilense/isolation & purification; Bacterial Proteins/isolation & purification; Base Sequence; DNA, Bacterial/genetics; Escherichia coli/chemistry; Gene Expression Regulation, Bacterial/genetics; Genes, Bacterial; Genetic Complementation Test; Molecular Sequence Data; Mutation; Nitrogen Fixation/genetics |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0005887: integral to plasma membrane |
ECO:0000255: |
|
C |
In Figure 2 of the paper on NtrY, it shows that it is a integral membrane protein. This was determined by hydropathy plot based on the method of Kyte and Doolittle. |
complete | |||
See also
References
See Help:References for how to manage references in GONUTS.
- ↑ Kyte, J & Doolittle, RF (1982) A simple method for displaying the hydropathic character of a protein. J. Mol. Biol. 157 105-32 PubMed GONUTS page
