ArticleInternational journal of molecular sciences2011
Modulation of rosR expression and exopolysaccharide production in Rhizobium leguminosarum bv. trifolii by phosphate and clover root exudates.
Article in International journal of molecular sciences, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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Who cites it
18 citing papers in PubMed, 46 citations in OpenAlex.
- Identifying Two New Ros/MucR Proteins: An Atypical Structure with a Divergent Function.Biomolecules · 2026Article
- Three separate pathways inApplied and environmental microbiology · 2024Article
- The Ros/MucR Zinc-Finger Protein Family in Bacteria: Structure and Functions.International journal of molecular sciences · 2022Review
- The Rhizobial Type 3 Secretion System: The Dr. Jekyll and Mr. Hyde in the Rhizobium-Legume Symbiosis.International journal of molecular sciences · 2022Review
- The convergent xenogeneic silencer MucR predisposes α-proteobacteria to integrate AT-rich symbiosis genes.Nucleic acids research · 2022Article
- Surface Motility Regulation ofInternational journal of molecular sciences · 2022Article
- Rhizobial Exopolysaccharides: Genetic Regulation of Their Synthesis and Relevance in Symbiosis with Legumes.International journal of molecular sciences · 2021Review
- Effects of high levels of nitrogen and phosphorus on perennial ryegrass (Lolium perenne L.) and its potential in bioremediation of highly eutrophic water.Environmental science and pollution research international · 2021Article
- Ancestral zinc-finger bearing protein MucR in alpha-proteobacteria: A novel xenogeneic silencer?Computational and structural biotechnology journal · 2020Review
- Transcriptomic Studies Reveal that theInternational journal of molecular sciences · 2019Article
- Genome analysis of a thermophilic exopolysaccharide-producing bacterium - Geobacillus sp. WSUCF1.Scientific reports · 2019Article
- Oxalic Acid FromFrontiers in microbiology · 2019Article
- Mutation in theGenes · 2018Article
- Article
- Exopolysaccharide Production by Sinorhizobium fredii HH103 Is Repressed by Genistein in a NodD1-Dependent Manner.PloS one · 2016Article
- Mechanisms and regulation of surface interactions and biofilm formation in Agrobacterium.Frontiers in plant science · 2014Review
- Expression of the Rhizobium leguminosarum bv. trifolii pssA gene, involved in exopolysaccharide synthesis, is regulated by RosR, phosphate, and the carbon source.Journal of bacteriology · 2013Article
- Environmental signals and regulatory pathways that influence exopolysaccharide production in rhizobia.International journal of molecular sciences · 2011Review
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The acidic exopolysaccharide (EPS) secreted in large amounts by the symbiotic nitrogen-fixing bacterium Rhizobium leguminosarum bv. trifolii is required for the establishment of an effective symbiosis with the host plant Trifolium spp. EPS biosynthesis in rhizobia is a very complex process regulated at both transcriptional and post-transcriptional levels and influenced by various nutritional and environmental conditions. The R. leguminosarum bv. trifolii rosR gene encodes a transcriptional regulator with a C(2)H(2) type zinc-finger motif involved in positive regulation of EPS synthesis. In silico sequence analysis of the 450-bp long rosR upstream region revealed the presence of several inverted repeats (IR1 to IR6) and motifs with significant identity to consensus sequences recognized by PhoB and LysR-type proteins associated with phosphate- and flavonoid-dependent gene regulation in R. leguminosarum. Using a set of sequentially truncated rosR-lacZ transcriptional fusions, the role of the individual motifs and the effect of phosphate and clover root exudates on rosR expression were established. In addition, the significance of IR4 inverted repeats in the repression, and P2-10 hexamer in the activation of rosR transcription, respectively, was found. The expression of rosR increased in the presence of phosphate (0.1-20 mM) and clover root exudates (10 μM). PHO boxes and the LysR motif located upstream of the rosR translation start site were engaged in the regulation of rosR transcription. The synthesis of EPS and biofilm formation decreased at high phosphate concentrations, but increased in the presence of clover root exudates, indicating a complex regulation of these processes.
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