Dissimilatory Sulfate- and Sulfur-Reducing Prokaryotes

Rabus, Ralf; Hansen, Theo A.; Widdel, Friedrich

doi:10.1007/978-3-642-30141-4_70

Cited by 228 publications

(329 citation statements)

References 896 publications

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“…Such organisms include acetogens, methanogens, sulfate reducing bacteria (SRB), ammoniaoxidizing planctomycetes, an autotrophic archaeal SRB, Archaeoglobales (Berg, 2011), anaerobic facultative autotrophs (Schauder et al, 1988) and, reversibly, with heterotrophs using carbon monoxide dehydrogenase (CODH) and acetyl-CoA synthase to oxidize acetyl-CoA (Rabus et al, 2006). Callaghan et al (2012) have also postulated that a reversed Wood-Ljungdahl pathway is carried out during the complete oxidation of alkanes under anaerobic conditions.…”

Section: Geochemical Characteristicsmentioning

confidence: 99%

“…Organisms within these two taxa, including 'Ca. D. audaxviator', have been shown to exhibit both heterotrophic and autotrophic lifestyles, depending on the conditions (Londry et al, 2004;Rabus et al, 2006;Chivian et al, 2008). The flexibility of individual microorganisms to perform both heterotrophy and autotrophy has been suggested to be a critical survival adaptation for hydrogeologically isolated systems as the carbon substrate concentrations may change over time (Moser et al, 2005) and flexibility may also be an important feature of keystone species (for example, 'Ca.…”

Section: Geochemical Characteristicsmentioning

confidence: 99%

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A metagenomic window into carbon metabolism at 3 km depth in Precambrian continental crust

et al. 2015

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Subsurface microbial communities comprise a significant fraction of the global prokaryotic biomass; however, the carbon metabolisms that support the deep biosphere have been relatively unexplored. In order to determine the predominant carbon metabolisms within a 3-km deep fracture fluid system accessed via the Tau Tona gold mine (Witwatersrand Basin, South Africa), metagenomic and thermodynamic analyses were combined. Within our system of study, the energy-conserving reductive acetyl-CoA (Wood-Ljungdahl) pathway was found to be the most abundant carbon fixation pathway identified in the metagenome. Carbon monoxide dehydrogenase genes that have the potential to participate in (1) both autotrophic and heterotrophic metabolisms through the reversible oxidization of CO and subsequent transfer of electrons for sulfate reduction, (2) direct utilization of H 2 and (3) methanogenesis were identified. The most abundant members of the metagenome belonged to Euryarchaeota (22%) and Firmicutes (57%)-by far, the highest relative abundance of Euryarchaeota yet reported from deep fracture fluids in South Africa and one of only five Firmicutes-dominated deep fracture fluids identified in the region. Importantly, by combining the metagenomics data and thermodynamic modeling of this study with previously published isotopic and community composition data from the South African subsurface, we are able to demonstrate that Firmicutes-dominated communities are associated with a particular hydrogeologic environment, specifically the older, more saline and more reducing waters.

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Section: Geochemical Characteristicsmentioning

confidence: 99%

Section: Geochemical Characteristicsmentioning

confidence: 99%

A metagenomic window into carbon metabolism at 3 km depth in Precambrian continental crust

et al. 2015

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“…For strain Rift-s3 T , Thermosipho affectus and Thermosipho globiformans, Fe(III) reduction did not stimulate growth of the organism, presumably serving as a hydrogen sink in the process characterized as 'facilitated fermentation' with insoluble electron acceptor (Rabus et al, 2006). For 'Thermosipho ferriphilus', Fe(III) reduction was demonstrated to both stimulate organotrophic growth and diminish growth inhibition by H 2 (Kendall, 2002).…”

mentioning

confidence: 99%

Thermosipho activus sp. nov., a thermophilic, anaerobic, hydrolytic bacterium isolated from a deep-sea sample

Podosokorskaya

Bonch-Osmolovskaya

Godfroy

et al. 2014

International Journal of Systematic and Evolutionary Microbiology

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A novel obligately anaerobic, extremely thermophilic, organotrophic bacterium, strain Rift-s3 T , was isolated from a deep-sea sample containing Riftia pachyptila sheath from Guaymas Basin, Gulf of California. Cells of the novel isolate were rods, 0.3-0.8 mm in width and 1.5-10 mm in length, surrounded by a sheath-like structure (toga). Strain Rift-s3 T grew at temperatures ranging from 44 to 75 6C, at pH 5.5 to 8.0, and with NaCl concentrations of 3 to 60 g l "1 . Under optimum conditions (65 6C, pH 6.0, NaCl 25 g l "1 ), the doubling time was 30 min. The isolate was able to ferment mono-, oligo-and polysaccharides including cellulose, chitin, xylan and pectin, and proteins including b-keratins, casein and gelatin. Acetate, hydrogen and carbon dioxide were the main products of glucose fermentation. The G+C content of the DNA was 30 mol%. Phylogenetic analysis of 16S rRNA gene sequences showed the affiliation of strain Rift-s3 T with the genus Thermosipho, with Thermosipho atlanticus Ob7 T as the closest relative (96.5 % 16S rRNA gene sequence similarity). Based on the phylogenetic analysis and physiological properties of the novel isolate we propose a novel species of the genus Thermosipho, Thermosipho activus sp. nov., with Rift-s3 T (5DSM 26467 T 5VKM B-2803 T ) as the type strain.

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“…-protobacteria (Gram-negative bacteria) are the main sulfate-reducing bacteria, with a few Gram-positive bacteria and thermophilic bacteria (Thermodesulfobacterium and Thermodesulfovibrio) [41]. There are very few sulfate-reducing archaea found to date, and these are mostly high-temperature hot spring archaea (Archaeoglobus) [41]. Based on sulfur isotope records, the origin of sulfatereducing microbes is estimated to be as early as 3.47 Ga [42,43].…”

Section: Gfgs In Sulfur Cyclingmentioning

confidence: 99%

“…Sulfur-reducing metabolism is also ancient, but has a low energy yield [41]. Microbes involved in this metabolism include bacteria and archaea, most of which are anaerobic heterotrophic microbes [41].…”

Section: Gfgs In Sulfur Cyclingmentioning

confidence: 99%

Geomicrobial functional groups: A window on the interaction between life and environments

et al. 2012

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Dissimilatory Sulfate- and Sulfur-Reducing Prokaryotes

Cited by 228 publications

References 896 publications

A metagenomic window into carbon metabolism at 3 km depth in Precambrian continental crust

A metagenomic window into carbon metabolism at 3 km depth in Precambrian continental crust

Thermosipho activus sp. nov., a thermophilic, anaerobic, hydrolytic bacterium isolated from a deep-sea sample

Geomicrobial functional groups: A window on the interaction between life and environments

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