ArticleApplied and environmental microbiology2004
Regulatory role of Rhizobium etli CNPAF512 fnrN during symbiosis.
Article in Applied and environmental microbiology, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- What determines symbiotic nitrogen fixation efficiency in rhizobium: recent insights into Rhizobium leguminosarum.Archives of microbiology · 2023Review
- Multiple sensors provide spatiotemporal oxygen regulation of gene expression in a Rhizobium-legume symbiosis.PLoS genetics · 2021Article
- Review
- Interaction and Regulation of Carbon, Nitrogen, and Phosphorus Metabolisms in Root Nodules of Legumes.Frontiers in plant science · 2018Review
- Article
- A quinol oxidase, encoded by cyoABCD, is utilized to adapt to lower O2 concentrations in Rhizobium etli CFN42.Microbiology (Reading, England) · 2015Article
- Characterization of the NifA-RpoN regulon in Rhizobium etli in free life and in symbiosis with Phaseolus vulgaris.Applied and environmental microbiology · 2010Article
- Effective symbiosis between Rhizobium etli and Phaseolus vulgaris requires the alarmone ppGpp.Journal of bacteriology · 2005Article
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Authors and funding
5 authors.
Funding
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Abstract
The Rhizobium etli CNPAF512 fnrN gene was identified in the fixABCX rpoN(2) region. The corresponding protein contains the hallmark residues characteristic of proteins belonging to the class IB group of Fnr-related proteins. The expression of R. etli fnrN is highly induced under free-living microaerobic conditions and during symbiosis. This microaerobic and symbiotic induction of fnrN is not controlled by the sigma factor RpoN and the symbiotic regulator nifA or fixLJ, but it is due to positive autoregulation. Inoculation of Phaseolus vulgaris with an R. etli fnrN mutant strain resulted in a severe reduction in the bacteroid nitrogen fixation capacity compared to the wild-type capacity, confirming the importance of FnrN during symbiosis. The expression of the R. etli fixN, fixG, and arcA genes is strictly controlled by fnrN under free-living microaerobic conditions and in bacteroids during symbiosis with the host. However, there is an additional level of regulation of fixN and fixG under symbiotic conditions. A phylogenetic analysis of the available rhizobial FnrN and FixK proteins grouped the proteins in three different clusters.
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