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Hydrothermal vent metagenome

ABSTRACT: Activity and phylogenetic diversity of sulfate-reducing microorganisms in low-temperature subsurface fluids within the upper oceanic crust

PROVIDER: PRJNA266850 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1646900.fastq.gz	Fastqsanger.gz
	SRR1646881.fastq.gz	Fastqsanger.gz
	SRR1646902.fastq.gz	Fastqsanger.gz
	SRR1646899.fastq.gz	Fastqsanger.gz

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Fermentative Spirochaetes drive nutrient cycling by a subsurface microbial loop in hydrocarbon-contaminated habitats

Project description:Members of the bacterial phylum Spirochaetes are primarily studied for their commensal and pathogenic roles in animal hosts. However, Spirochaetes are also frequently detected in anoxic hydrocarbon-contaminated environments but their ecological role in such ecosystems has so far remained unclear. Here we provide a functional trait to these frequently detected organisms with an example of a sulfate-reducing, naphthalene-degrading enrichment culture consisting of a sulfate-reducing deltaproteobacterium Desulfobacterium naphthalenivorans and a novel spirochete Rectinema cohabitans. Using a combination of genomic, proteomic, and physiological studies we show that R. cohabitans grows by fermentation of organic compounds derived from biomass from dead cells (necromass). It recycles the derived electrons in the form of H2 to the sulfate-reducing D. naphthalenivorans, thereby supporting naphthalene degradation and forming a simple microbial loop. We provide metagenomic evidence that equivalent associations between Spirochaetes and hydrocarbon-degrading microorganisms are of general importance in hydrocarbon- and organohalide-contaminated ecosystems. We propose that environmental Spirochaetes form a critical component of a microbial loop central to nutrient cycling in subsurface environments. This emphasizes the importance of necromass and H2-cycling in highly toxic contaminated subsurface habitats such as hydrocarbon-polluted aquifers.

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MetaboLights MTBLS428 - GNPS "Dissolved organic carbon compounds in deep-sea hydrothermal vent fluids"

Project description:This data set was downloaded from MetaboLights (http://www.ebi.ac.uk/metabolights/) accession number MTBLS428 Abstract:"Deep-sea hydrothermal vents are unique ecosystems that may provide chemically distinct dissolved organic matter to the deep ocean. Here, we describe the types and concentrations of polar dissolved organic compounds observed at low and high temperature hydrothermal vents at 9°50’N, the East Pacific Rise. The concentration of dissolved organic carbon was 46 µM in the low temperature hydrothermal fluids and 14 µM in the high temperature hydrothermal fluids. In the low temperature vent fluids, identifiable dissolved organic compounds were dominated by water-soluble vitamins and amino acids. Derivatives of benzoic acid and the organic sulfur compound 2,3-dihydroxypropane-1-sulfonate (DHPS) were also present in low and high temperature hydrothermal fluids. Thus, low temperature vent fluids contain organic compounds that are central to biological processes, suggesting that they are a by-product of subseafloor biological activity. These compounds may fuel heterotrophic, metabolic processes at deep-sea hydrothermal vents and beyond."

2018-08-07 | MSV000082795 | GNPS

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