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Fermentative Spirochaetes mediate necromass recycling in anoxic hydrocarbon-contaminated habitats.
ISME J. 12, 2039-2050 (2018)
Spirochaetes are frequently detected in anoxic hydrocarbon- and organohalide-polluted groundwater, but their role in such ecosystems has remained unclear. To address this, we studied a sulfate-reducing, naphthalene-degrading enrichment culture, mainly comprising the sulfate reducer Desulfobacterium N47 and the rod-shaped Spirochete Rectinema cohabitans HM. Genome sequencing and proteome analysis suggested that the Spirochete is an obligate fermenter that catabolizes proteins and carbohydrates, resulting in acetate, ethanol, and molecular hydrogen (H-2) production. Physiological experiments inferred that hydrogen is an important link between the two bacteria in the enrichment culture, with H-2 derived from fermentation by R. cohabitans used as reductant for sulfate reduction by Desulfobacterium N47. Differential proteomics and physiological experiments showed that R. cohabitans utilizes biomass (proteins and carbohydrates) released from dead cells of Desulfobacterium N47. Further comparative and community genome analyses indicated that other Rectinema phylotypes are widespread in contaminated environments and may perform a hydrogenogenic fermentative lifestyle similar to R. cohabitans. Together, these findings indicate that environmental Spirochaetes scavenge detrital biomass and in turn drive necromass recycling at anoxic hydrocarbon-contaminated sites and potentially other habitats.
Impact Factor
Scopus SNIP
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Times Cited
Times Cited
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9.520
2.284
26
33
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Sulfate-reducing Bacteria; Enrichment Culture; Gen. Nov.; Degradation; Naphthalene; Hydrogenase; Annotation; Consortium; Sediment; Database
Language
english
Publication Year
2018
HGF-reported in Year
2018
ISSN (print) / ISBN
1751-7362
e-ISSN
1751-7370
Journal
ISME Journal
Quellenangaben
Volume: 12,
Issue: 8,
Pages: 2039-2050
Publisher
Nature Publishing Group
Publishing Place
Macmillan Building, 4 Crinan St, London N1 9xw, England
Reviewing status
Peer reviewed
Institute(s)
Institute of Groundwater Ecology (IGOE)
POF-Topic(s)
20403 - Sustainable Water Management
Research field(s)
Environmental Sciences
PSP Element(s)
G-504300-002
WOS ID
WOS:000441575100014
Scopus ID
85047810724
Erfassungsdatum
2018-07-12