Browsing by Author "Rodríguez Carvajal, Miguel Ángel"
Now showing items 1-17 of 17
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A purL mutant of Sinorhizobium fredii HH103 is symbiotically defective and altered in its lipopolysaccharide [Article]
(Microbiology Society, 2003)The pleiotropic phenotype of an auxotrophic purL mutant (SVQ295) of Sinorhizobium fredii HH103 has been investigated. SVQ295 forms colonies that are translucent, produce more slime and absorb less Congo red than those ...
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Bacterial Molecular Signals in the Sinorhizobium fredii-Soybean Symbiosis [Article]
(MDPI AG, 2016)Sinorhizobium (Ensifer) fredii (S. fredii) is a rhizobial species exhibiting a remarkably broad nodulation host-range. Thus, S. fredii is able to effectively nodulate dozens of different legumes, including plants forming ...
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Estudio estructural de los polisacáridos capsulares de Sinorhizobium Fredii [PhD Thesis]
(1999-12-15)La estructura del polisacárido capsular S. Fredii HH103 se ha determiando mediante la utilización de las técnicas avanzadas de determinación estructural; electroforesis en geles de poliacrilamida, cromatografía de ...
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Exopolysaccharide Production by Sinorhizobium fredii HH103 Is Repressed by Genistein in a NodD1-Dependent Manner [Article]
(Public Library of Science, 2016)In the rhizobia-legume symbiotic interaction, bacterial surface polysaccharides, such as exopolysaccharide (EPS), lipopolysaccharide (LPS), K-antigen polysaccharide (KPS) or cyclic glucans (CG), appear to play crucial roles ...
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Gene Replacement and Fluorescent Labeling to Study the Functional Role of Exopolysaccharides in Bifidobacterium animalis subsp. lactis [Article]
(Frontiers Media, 2017)An extracellular layer of exopolysaccharides (EPS) covers the surface of some Bifidobacterium animalis subsp. lactis strains, which could be of relevance for its probiotic performance. In order to understand the functional ...
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Nodulation-gene-inducing flavonoids increase overall production of autoinducers and expression of N-acyl homoserine lactone synthesis genes in rhizobia [Article]
(2011)Legume-nodulating rhizobia use N-acyl homoserine lactones (AHLs) to regulate several physiological traits related to the symbiotic plant–microbe interaction. In this work, we show that Sinorhizobium fredii SMH12, Rhizobium ...
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Novel mixed-linkage β-glucan activated by c-di-GMP in Sinorhizobium meliloti [Article]
(National Academy of Sciences, 2015)An artificial increase of cyclic diguanylate (c-di-GMP) levels in Sinorhizobium meliloti 8530, a bacterium that does not carry known cellulose synthesis genes, leads to overproduction of a substance that binds the dyes ...
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Opening the "black box" of nodD3, nodD4 and nodD5 genes of Rhizobium tropici strain CIAT 899 [Article]
(BioMed Central, 2015)Background: Transcription of nodulation genes in rhizobial species is orchestrated by the regulatory nodD gene. Rhizobium tropici strain CIAT 899 is an intriguing species in possessing features such as broad host range, ...
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Rice and bean AHL-mimic quorum-sensing signals specifically interfere with the capacity to form biofilms by plant-associated bacteria [Article]
(2013)Many bacteria regulate their gene expression in response to changes in their population density in a process called quorum sensing (QS), which involves communication between cells mediated by small diffusible signal molecules ...
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Role of surface tryptophan for peroxidase oxidation of nonphenolic lignin [Article]
(BMC (part of Springer Nature), 2016)Background: Despite claims as key enzymes in enzymatic delignification, very scarce information on the reaction rates between the ligninolytic versatile peroxidase (VP) and lignin peroxidase (LiP) and the lignin polymer ...
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Structure and biological roles of Sinorhizobium fredii HH103 exopolysaccharide [Article]
(Public Library of Science, 2014)Here we report that the structure of the Sinorhizobium fredii HH103 exopolysaccharide (EPS) is composed of glucose, galactose, glucuronic acid, pyruvic acid, in the ratios 5:2:2:1 and is partially acetylated. A S. fredii ...
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The rkpU gene of Sinorhizobium fredii HH103 is required for bacterial K-antigen polysaccharide production and for efficient nodulation with soybean but not with cowpea [Article]
(Society for General Microbiology, 2010)In this work, the role of the rkpU and rkpJ genes in the production of the K-antigen polysaccharides (KPS) and in the symbiotic capacity of Sinorhizobium fredii HH103, a broad host-range rhizobial strain able to nodulate ...
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The underlying process of early ecological and genetic differentiation in a facultative mutualistic Sinorhizobium meliloti population [Article]
(Nature Publishing Group, 2017)The question of how genotypic and ecological units arise and spread in natural microbial populations remains controversial in the field of evolutionary biology. Here, we investigated the early stages of ecological and ...