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• W2344318155 abstract "Microbial molecular hydrogen (H2) cycling is central to metabolic homeostasis and microbial composition in the human gastrointestinal tract. Molecular H2 is produced as an endproduct of carbohydrate fermentation and is reoxidised primarily by sulfate-reduction, acetogenesis, and methanogenesis. However, the enzymatic basis for these processes is incompletely understood and the hydrogenases responsible have not been investigated. In this work, we surveyed the genomic and metagenomic distribution of hydrogenase-encoding genes in the human colon to infer dominant mechanisms of H2 cycling. The data demonstrate that 70% of gastrointestinal microbial species listed in the Human Microbiome Project encode the genetic capacity to metabolise H2. A wide variety of anaerobically-adapted hydrogenases were present, with [FeFe]-hydrogenases predominant. We subsequently analyzed the hydrogenase gene content of stools from 20 healthy human subjects. The hydrogenase gene content of all samples was overwhelmingly dominated by fermentative and electron-bifurcating [FeFe]-hydrogenases emerging from the Bacteroidetes and Firmicutes. This study supports that H2 metabolism in the human gut is driven by fermentative H2 production and interspecies H2 transfer. However, it suggests that electron-bifurcation rather than respiration is the dominant mechanism of H2 reoxidation in the human colon, generating reduced ferredoxin to sustain carbon-fixation (e.g. acetogenesis) and respiration (via the Rnf complex). This work provides the first comprehensive bioinformatic insight into the mechanisms of H2 metabolism in the human colon." @default.
• W2344318155 created "2016-06-24" @default.
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• W2344318155 date "2016-04-28" @default.
• W2344318155 modified "2023-10-16" @default.
• W2344318155 title "H₂metabolism is widespread and diverse among human colonic microbes" @default.
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• W2344318155 doi "https://doi.org/10.1080/19490976.2016.1182288" @default.
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