Project description:Purpose: Identify differentially regulated genes in three Bacteroides species (B. intestinalis, B. cellulosylitycus, and B. oleiciplenus) under xylose:arabinose growth compared to insoluble wheat arabinoxylan Methods: Bacterial mRNA profiles of mid-log cultures were generated by deep sequencing using Illumina 4000, in duplicates. The sequences were trimmed based on quality scores using Trimmomatic.
Project description:β-Mannans are plant cell wall polysaccharides that are commonly found in human diets. However, a mechanistic understanding into the key populations that degrade this glycan is absent, especially for the dominant Firmicutes phylum. Here, we show that the prominent butyrate-producing Firmicute Roseburia intestinalis expresses two loci conferring metabolism of β-mannans. We combine multi-“omic” analyses and detailed biochemical studies to comprehensively characterize loci-encoded proteins that are involved in β-mannan capturing, importation, de-branching and degradation into monosaccharides. In mixed cultures, R. intestinalis shares the available β-mannan with Bacteroides ovatus, demonstrating that the apparatus allows coexistence in a competitive environment. In murine experiments, β-mannan selectively promotes beneficial gut bacteria, exemplified by increased R. intestinalis, and reduction of mucus-degraders. Our findings highlight that R. intestinalis is a primary degrader of this dietary fiber and that this metabolic capacity could be exploited to selectively promote key members of the healthy microbiota using β-mannan-based therapeutic interventions.
Project description:Strain Bacteroides intestinalis TSDC17.2-1.2 (species Bacteroides intestinalis) was isolated from the fecal microbiota of a USA female at time point zero (bacterial isolates were sequenced from this donor on day 0 and 49). The species name was assigned by genome clustering.
Project description:Strain Bacteroides intestinalis TSDC20.2-1.1 (species Bacteroides intestinalis) was isolated from the fecal microbiota of a USA female at time point zero (bacterial isolates were sequenced from this donor on day 0 and 57). The species name was assigned by genome clustering.
Project description:Strain Bacteroides intestinalis TSDC20.2-1.2 (species Bacteroides intestinalis) was isolated from the fecal microbiota of a USA female at time point zero (bacterial isolates were sequenced from this donor on day 0 and 57). The species name was assigned by genome clustering.
Project description:Strain Bacteroides intestinalis TSDC20.2-2.1 (species Bacteroides intestinalis) was isolated from the fecal microbiota of a USA female at time point zero (bacterial isolates were sequenced from this donor on day 0 and 57). The species name was assigned by genome clustering.
