Unknown,Transcriptomics,Genomics,Proteomics

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Coordinate regulation of glycan degradation and polysaccharide capsule biosynthesis by a prominent human gut symbiont

ABSTRACT: Analysis of B. thetaiotaomicron trans-envelope signaling mutants in ECF-sigma factors, anti-sigma factors and SusC-like transporters. B. thetaiotaomicron mutants were transcriptionally profiled after growth in vitro in either minimal medium plus glucose or minimal medium plus neutral O-glycans

ORGANISM(S): Bacteroides thetaiotaomicron VPI-5482

SUBMITTER: Eric Martens

PROVIDER: E-GEOD-14592 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Coordinate regulation of glycan degradation and polysaccharide capsule biosynthesis by a prominent human gut symbiont.

Martens Eric C EC Roth Robyn R Heuser John E JE Gordon Jeffrey I JI

The Journal of biological chemistry 20090429 27

Bacteria in the distal human gut have evolved diverse abilities to metabolize complex glycans, including the capacity to degrade these compounds as nutrients and to assemble their component sugars into new polymers such as extracellular capsules. The human gut bacterium Bacteroides thetaiotaomicron is well endowed with the ability to metabolize both host- and diet-derived glycans. Its genome contains 88 different polysaccharide utilization loci (PULs) for complex glycan catabolism and eight diff ...[more]

PMID: 19403529

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Project description:PhyR is an unusual type of response regulator consisting of a receiver domain and an extracytoplasmic function (ECF) sigma factor-like domain. It was recently described as a master regulator of general stress response in Methylobacterium extorquens. Orthologues of this regulator are present in essentially all free-living Alphaproteobacteria. In most of them, phyR is genetically closely linked to a gene encoding an ECF sigma factor. Here, we investigate the role of these two regulators in the soybean symbiont Bradyrhizobium japonicum USDA110. Using deletion mutants and phenotypic assays, we showed that PhyR and the ECF sigma factor sigma(EcfG) are involved in heat shock and desiccation resistance upon carbon starvation. Both mutants had symbiotic defects on the plant hosts Glycine max (soybean) and Vigna radiata (mungbean). They induced fewer nodules than the wild type and these nodules were smaller, less pigmented, and their specific nitrogenase activity was drastically reduced 2 or 3 weeks after inoculation. Four weeks after infection, soybean nodule development caught up to a large extent whereas most mungbean nodules remained defective even 5 weeks after infection. Remarkably, both mutants triggered aberrant nodules on the different host plants with ectopically emerging roots. Microarray analysis revealed that PhyR and sigma(EcfG) control congruent regulons suggesting both regulators are part of the same signalling cascade. This finding was further substantiated by in vitro protein-protein interaction studies which are in line with a partner-switching mechanism controlling gene regulation triggered by phosphorylation of PhyR. The large number of genes of unknown function present in the PhyR/sigma(EcfG) regulon and the conspicuous symbiotic phenotype suggest that these regulators are involved in the Bradyrhizobium-legume interaction via yet undisclosed mechanisms. Comparative analysis of the B. japonicum phyR mutant 8402, ecfG mutant 8404 mutant and the wild type during exponential growth in rich medium (PSY) and after 24 hours starvation in carbon source-free minimal medium

Dataset Information

Coordinate regulation of glycan degradation and polysaccharide capsule biosynthesis by a prominent human gut symbiont

Publications

Coordinate regulation of glycan degradation and polysaccharide capsule biosynthesis by a prominent human gut symbiont.

Similar Datasets

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