The Order Thermococcales and the Family Thermococcaceae

Schut, Gerrit J.; Lipscomb, Gina L.; Han, Young-Tak; Notey, Jaspreet; Kelly, Robert M.; Adams, Michael W. W.

doi:10.1007/978-3-642-38954-2_324

Cited by 18 publications

(15 citation statements)

References 237 publications

(153 reference statements)

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“…They are necessary for the cellular transport processes, and act as enzyme cofactors (Gomez-Romero et al, 2014). For example, iron is a major constituent of bifurcating Fe-Fe hydrogenase in T. maritima, the key enzyme involved in fermentative hydrogen production, and containing a bimetallic Fe-Fe active center (Schut et al, 2014). Its limitation can reduce biohydrogen production by deviating the fermentation pathways toward the production of more reduced end products such as lactate (Zhang and Shen, 2006).…”

Section: Methodsmentioning

confidence: 99%

Biohydrogen production from hyperthermophilic anaerobic digestion of fruit and vegetable wastes in seawater: Simplification of the culture medium of Thermotoga maritima

et al. 2018

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Biohydrogen production by the hyperthermophilic and halophilic bacterium T. maritima, using fruit and vegetable wastes as the carbon and energy sources was studied. Batch fermentation cultures showed that the use of a culture medium containing natural seawater and fruit and vegetable wastes can replace certain components (CaCl, MgCl, Balch's oligo-elements, yeast extract, KHPO and KHPO) present in basal medium. However, a source of nitrogen and sulfur remained necessary for biohydrogen production. When fruit and vegetable waste collected from a wholesale market landfill was used, no decreases in total H production (139 mmol L) or H yield (3.46 mol mol) was observed.

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Section: Methodsmentioning

confidence: 99%

Biohydrogen production from hyperthermophilic anaerobic digestion of fruit and vegetable wastes in seawater: Simplification of the culture medium of Thermotoga maritima

et al. 2018

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“…1C). All members of the Thermococcales are characterized by their ability to use complex or simple peptides as energy and carbon source by necessarily using elemental sulfur as electron acceptor [38]. The breakdown of peptides and amino acids leads to the subsequent production of organic acids linked to substrate-level phosphorylation.…”

Section: Discussionmentioning

confidence: 99%

Thriving of hyperthermophilic microbial communities from a deep-sea sulfidic hydrothermal chimney under electrolithoautotrophic conditions with nitrate as electron acceptor

Pillot

Davidson

Shintu

et al. 2021

Preprint

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Recent studies have shown the presence of an abiotic electrical current across the walls of deep-sea hydrothermal chimneys, allowing the growth of electroautotrophic microbial communities. To understand the role of the different phylogenetic groups and metabolisms involved, this study focused on an electrotrophic enrichment, with nitrate as electron acceptor. The biofilm density, the community composition, the organic products released, and the electrical consumption were monitored by FISH confocal microscopy, qPCR, Metabarcoding, MNR and potentiostat measurements. A statistic analysis by PCA showed the correlation between the different parameters in 3 distinct temporal phases. The Archaeoglobales have been shown to play a key role in the development of the community, as first colonizers and producing pyruvate, therefor used as organic source for heterotrophs. Some Thermococcales showed the ability to perform electrofermentation of this pyruvate into acetate and H2. Finally, through subcultures of the community, we showed the development of a larger biodiversity over time. This observed phenomenon could explain the biodiversity development in hydrothermal context where energy sources are transient and unstable.

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“…Deep sea hydrothermal vents resemble the early Earth , and thus the dominant Thermococcaceae inhabitants, which occupy an evolutionarily basal position of the archaeal tree 2,3 and take an obligate anaerobic hyperthermophilic free-living lifestyle 4 , are likely excellent models to study the evolution of early life. Here, we determined that unbiased mutation rate of a representative species, Thermococcus eurythermalis 5 , exceeded that of all known free-living prokaryotes by 1-2 orders of magnitude, and thus rejected the long-standing hypothesis that low mutation rates were selectively favored in hyperthermophiles [6][7][8] .…”

Section: Discussionmentioning

confidence: 99%

Unexpectedly high mutation rate of a deep-sea hyperthermophilic anaerobic archaeon

Wang

et al. 2020

Preprint

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SummaryDeep sea hydrothermal vents resemble the early Earth 1, and thus the dominant Thermococcaceae inhabitants, which occupy an evolutionarily basal position of the archaeal tree 2,3 and take an obligate anaerobic hyperthermophilic free-living lifestyle 4, are likely excellent models to study the evolution of early life. Here, we determined that unbiased mutation rate of a representative species, Thermococcus eurythermalis5, exceeded that of all known free-living prokaryotes by 1-2 orders of magnitude, and thus rejected the long-standing hypothesis that low mutation rates were selectively favored in hyperthermophiles 6–8. We further sequenced multiple and diverse isolates of this species and calculated that T. eurythermalis has a lower effective population size than other free-living prokaryotes by 1-2 orders of magnitude. These data are well explained by the “drift-barrier” model 9, indicating that the high mutation rate of this species is not selectively favored but instead driven by random genetic drift. The availability of these unusual data has far-reaching implications for prokaryote genome evolution. For example, a synthesis of additional 29 species with unbiased mutation rate data across bacteria and archaea enabled us to conclude that genome reduction across prokaryotes is universally driven by increased mutation rate and random genetic drift. Taken together, exceptionally high mutation rate and low effective population size likely feature the early life in hot and anoxic marine habitats, which are indispensable in synthesizing the universal rule of genome evolution across prokaryotes and the Earth history.

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The Order Thermococcales and the Family Thermococcaceae

Cited by 18 publications

References 237 publications

Biohydrogen production from hyperthermophilic anaerobic digestion of fruit and vegetable wastes in seawater: Simplification of the culture medium of Thermotoga maritima

Biohydrogen production from hyperthermophilic anaerobic digestion of fruit and vegetable wastes in seawater: Simplification of the culture medium of Thermotoga maritima

Thriving of hyperthermophilic microbial communities from a deep-sea sulfidic hydrothermal chimney under electrolithoautotrophic conditions with nitrate as electron acceptor

Unexpectedly high mutation rate of a deep-sea hyperthermophilic anaerobic archaeon

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