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Type of microorganism that produces methane as a waste product
Methanogens are anaerobic archaea that produce methane as a byproduct of their energy metabolism, i.e., catabolism. Methane production, or methanogenesis
Methanogen
Methanogen homoaconitase (EC 4.2.1.114, methanogen HACN) is an enzyme with systematic name (R)-2-hydroxybutane-1,2,4-tricarboxylate hydro-lyase ((1R
Methanogen_homoaconitase
Genus of archaea
Methanopyrus is a genus of methanogen, with a single described species, Methanopyrus kandleri (type strain AV19). It is a rod-shaped hyperthermophile,
Methanopyrus
Organisms that obtain energy by the oxidation of electron donors in their environments
such ecosystems. Chemoautotrophs generally fall into several groups: methanogens, sulfur oxidizers and reducers, nitrifiers, anammox bacteria, and thermoacidophiles
Chemotroph
Genus of archaea
them, and they only inhabit anoxic environments. A shared trait by all methanogens is their ability to recycle products. They can use the products of metabolic
Methanobacterium
Domain of organisms
found to be parasitic; many are mutualists or commensals, such as the methanogens (methane-producers) that inhabit the gastrointestinal tract in humans
Archaea
Earth's most severe extinction event
methane trapped in the crystal lattice of ice. This methane, produced by methanogen microbes, has a 13C ⁄ 12C isotope ratio about 6% below normal (δ13C −6
Permian–Triassic extinction event
Permian–Triassic_extinction_event
Genus of archaea
Methanocaldococcus formerly known as Methanococcus is a genus of coccoid methanogen archaea. They are all thermophiles, including M. infernus and the hyperthermophilic
Methanocaldococcus
Hydrocarbon compound (CH4) in natural gas
respiration only known to be conducted by some members of the domain Archaea. Methanogens occur in landfills and soils, ruminants (for example, cattle), the guts
Methane
Species of archaeon
Methanogenium marinum is a psychrophilic, H2-using methanogen from Skan Bay, Alaska. Its cells are highly irregular, non-motile coccoids (diameter, 1 to
Methanogenium_marinum
History of Earth 4600–539 million years ago
Zahnle, Kevin; Kamber, Balz S. (2009). "Oceanic nickel depletion and a methanogen famine before the Great Oxidation Event". Nature. 458 (7239): 750–753
Precambrian
Species of archaea
its wide range of substrates used in methanogenesis. While most known methanogens produce methane from H2 and CO2, M. barkeri can also dismutate methylated
Methanosarcina_barkeri
Organic compounds containing amine and carboxylic groups
Chan MK (May 2002). "A new UAG-encoded residue in the structure of a methanogen methyltransferase". Science. 296 (5572): 1462–1466. Bibcode:2002Sci..
Amino_acid
Species of archaeon
Methanoculleus hydrogenitrophicus is a methanogen. Tian, J.; Wang, Y.; Dong, X. (2009). "Methanoculleus hydrogenitrophicus sp. nov., a methanogenic archaeon
Methanoculleus hydrogenitrophicus
Methanoculleus_hydrogenitrophicus
Species of archaeon
fermentation (H2, CO2, acetate, and formate). M. smithii is a hydrogenotrophic methanogen that utilizes hydrogen by combining it with carbon dioxide to form methane
Methanobrevibacter_smithii
Salt formed from acetic acid and a base
CO2 ΔG° = −36 kJ/mol This disproportionation reaction is catalysed by methanogen archaea in their fermentative metabolism. One electron is transferred
Acetate
Non-protein chemical compound or metallic ion
this wide distribution is a group of unique cofactors that evolved in methanogens, which are restricted to this group of archaea. Although enzyme catalyzed
Cofactor_(biochemistry)
Bodily function of expelling intestinal gas from the anus
cows, gas and burps are produced by methane-generating microbes called methanogens, which live inside the cow's digestive system. Proposals for reducing
Flatulence
Organisms that live in salt water
at 122 °C and isotopically heavy CH4 production by a hyperthermophilic methanogen under high-pressure cultivation". Proceedings of the National Academy
Marine_life
Methanogens are a group of microorganisms that produce methane as a byproduct of their metabolism. They play an important role in the digestive system
Methanogens in digestive tract of ruminants
Methanogens_in_digestive_tract_of_ruminants
Formation of methane by microbes
formation of methane coupled to energy conservation by microbes known as methanogens. It is the fourth and final stage of anaerobic digestion. Organisms capable
Methanogenesis
Chemical compound
Use of hydroxyarchaeol as a biomarker was a primary way to identify methanogens in the environment, though it has become supplementary to metagenomic
Hydroxyarchaeol
Kingdom of archaea
kingdom of archaea. Methanobacteriati are highly diverse and include methanogens, which produce methane and are often found in intestines; halobacteria
Methanobacteriati
Organel for methanogenesis in ruminants
fermentation, hydrogen gas (H2) and carbon dioxide (CO2), are used by methanogens, whose waste product is methane (CH4), a powerful heat-trapping greenhouse
Hydrogenobody
Cereal grain and staple food
creates a shift in biomass production from root to shoot, decreasing the methanogen population, and resulting in a reduction of methane emissions of up to
Rice
First epoch of the Neogene Period
igneous crust of the Fennoscandian Shield shifted from being dominated by methanogens to being primarily composed of sulphate-reducing prokaryotes. The change
Miocene
Hypothesis for classification of life
[citation needed] Some examples of archaeal organisms are:[citation needed] methanogens – which produce the gas methane halophiles – which live in very salty
Three-domain_system
Shrub growing in brackish water
providing an optimal microenvironment for sulfate-reducing bacteria and methanogens, ligninolytic, cellulolytic, and amylolytic fungi are prevalent in the
Mangrove
Study of organisms and their environment
stability. The evolution of the earliest organisms, likely anaerobic methanogen microbes, started the process by converting atmospheric hydrogen into
Ecology
Species of archaeon
Methanolobus profundi is a mesophilic, methylotrophic methanogen archaeon. The type strain is MobMT (=DSM 21213T =NBRC 104158T). It was isolated from a
Methanolobus_profundi
Species of archaeon
Methanoculleus submarinus is a methanogen. It is non-motile and highly irregular coccoid-shaped (with average diameter of 0.8-2 μm). Nankai-1 is its type
Methanoculleus_submarinus
Species of archaeon
Methanobrevibacter wolinii is a species of methanogen archaeon, named after Meyer J. Wolin. Coccobacillus with slightly tapered ends, about t 0.6 micrometres
Methanobrevibacter_wolinii
Microscopic living organism
eruptions from the Siberian Traps – may have accelerated the evolution of methanogens towards the end of the Permian–Triassic extinction event. Microorganisms
Microorganism
Set of chemical reactions in organisms
ancestor. This universal ancestral cell was prokaryotic and probably a methanogen that had extensive amino acid, nucleotide, carbohydrate and lipid metabolism
Metabolism
Species of archaeon
Methanobrevibacter filiformis is a species of methanogen archaeon. It was first isolated from the hindgut of the termite Reticulitermes flavipes. It is
Methanobrevibacter_filiformis
Species of domesticated mammal
476 pp. Wright, A.-D. G.; et al. (2004). "Molecular diversity of rumen methanogens from sheep in Western Australia". Appl. Environ. Microbiol. 70 (3): 1263–1270
Sheep
Genus of archaea
corrected to Methanimicrococcus blatticola, making it the only genus of methanogens that has -i as a connecting vowel rather than -o in the name. The cells
Methanimicrococcus
Species of archaeon
dioxide, although alternatives such as formate are also used. Though all methanogens use certain key coenzymes, cofactors, and intermediates to produce methane
Methanococcus_maripaludis
Ecosystem that is flooded or saturated with water
wetlands are the ideal anaerobic environments for fermentation as well as methanogen activity. However, levels of methanogenesis fluctuates due to the availability
Wetland
Gases produced by decomposing organic matter
produced industrially via anaerobic digestion with anaerobic organisms or methanogens inside an anaerobic digester or other type of bioreactor. The gas composition
Biogas
Largest moon of Saturn
of −179.2 °C (−290.6 °F; 94.0 K). All life forms on Earth (including methanogens) use liquid water as a solvent; it is speculated that life on Titan might
Titan_(moon)
Species of archaeon
Methanogenium frigidum is a psychrophilic, H2-using methanogen from Ace Lake, Antarctica. Cells are psychrophilic, irregular, slightly halophilic and non-motile
Methanogenium_frigidum
Protein family
enzyme participates in folate biosynthesis. Ftr from the thermophilic methanogen Methanopyrus kandleri (which has an optimum growth temperature 98 degrees
Formylmethanofuran—tetrahydromethanopterin N-formyltransferase
Formylmethanofuran—tetrahydromethanopterin_N-formyltransferase
Genus of archaea
Methanococcus is a genus of coccoid methanogens of the family Methanococcaceae. They are all mesophiles, except the thermophilic M. thermolithotrophicus
Methanococcus
Unicellular organism lacking a membrane-bound nucleus
temperatures (thermophiles) or high salinity (halophiles). Some archaeans are methanogens, living in anoxic environments and releasing methane. Many archaea grow
Prokaryote
Family of mammals
Yang, Qi-hong; Luo, Ling-juan; Yang, Ming-xian (2013). "Diversity of methanogens in the hindgut of captive white rhinoceroses, Ceratotherium simum". BMC
Rhinoceros
Organism that thrives at relatively high temperatures
at 122°C and isotopically heavy CH4 production by a hyperthermophilic methanogen under high-pressure cultivation". PNAS. 105 (31): 10949–51. Bibcode:2008PNAS
Thermophile
Paleoproterozoic surge in atmospheric oxygen
powerful greenhouse gas and was produced by early forms of life known as methanogens. Scientists continue to research how the Earth was warmed before life
Great_Oxidation_Event
Medical condition
proposed that the condition should be classified as a separate 'intestinal methanogen overgrowth' (IMO). Symptoms traditionally linked to SIBO include bloating
Small intestinal bacterial overgrowth
Small_intestinal_bacterial_overgrowth
Microorganism producing acetate from CO2 and H2 through the reductive acetyl coenzyme A
together with methanogens, as exemplified by the conversion of carbohydrates by a Methanosarcina barkeri and coculture of A. woodii. The methanogen takes up
Acetogen
Species of archaeon
Methanomethylovorans hollandica is a species of methylotrophic methanogen able to grow on dimethyl sulfide and methanethiol. It is the type species of
Methanomethylovorans hollandica
Methanomethylovorans_hollandica
Transfer of genes from unrelated organisms
Haloarchaea are aerobic halophiles thought to have evolved from anaerobic methanogens. A large amount of their genome, 126 composite gene families, are derived
Horizontal_gene_transfer
Scientific assessments on the microbial habitability of Titan
the surface environment, and which living things comparable to Earth methanogens could combine with some of the organic compounds (such as acetylene)
Life_on_Titan
Genus of bacteria
well investigated for its interspecies electron transfer, even to a methanogen. Geopsychrobacter electrodiphilus was isolated from the surface of an
Geopsychrobacter
Lake that is strongly alkaline
hypolimnion, methanogens use these compounds to derive energy, by producing methane, a procedure known as methanogenesis. A diversity of methanogens including
Soda_lake
Release of gas from the upper digestive tract through the mouth
Industrial Research Organisation of Perth, Australia, to develop an anti-methanogen vaccine to minimize methane in cow burps. One reason why cows burp so
Belching
Actions to reduce net greenhouse gas emissions to limit climate change
Kumar, J.I.; Joshi, C.G. (2015). "Exploring diet-dependent shifts in methanogen and methanotroph diversity in the rumen of Mehsani buffalo by a metagenomics
Climate_change_mitigation
Genus of archaea
thermophilic and grow best at temperatures between 55 °C and 65 °C. They are methanogens; they use carbon dioxide and hydrogen as substrates to produce methane
Methanothermobacter
Gas produced naturally within marshes, swamps and bogs
also be produced by methanogens, archaea that produce methane under anoxic conditions, in a process known as methanogenesis. Methanogens generate Methanosarcina
Marsh_gas
Natural satellite orbiting Saturn
hydrogen (H 2), a geochemical source of energy that can be metabolized by methanogen microbes to provide energy for life, could be present if, as models suggest
Enceladus
Ancestor of all current life on Earth
modifications and S-adenosylmethionine-dependent methylations." They show that methanogens and clostridia were basal, near the root of the phylogenetic tree, in
Last universal common ancestor
Last_universal_common_ancestor
Genus of archaea
Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI). Methanogen List of Archaea genera C.L. Schoch. "Methanohalophilus". National Center
Methanohalophilus
Class of archaea
Information (NCBI). Several of the classes of the "Methanobacteriati" are methanogens and the Methanobacteria are one of these classes. Methanobacteria can
Methanobacteria
Order of archaea
the class Methanobacteria. Species within this order differ from other methanogens in that they can use fewer catabolic substrates and have distinct morphological
Methanobacteriales
Series of interconnected biochemical reactions
Bacillota, especially in the Clostridia. The pathway is also used by methanogens, which are mainly Euryarchaeota, and several anaerobic chemolithoautotrophs
Biological_carbon_fixation
Hoofed herbivorous grazing or browsing mammals
digestive physiology. Methane is produced by a type of archaea, called methanogens, as described above within the rumen, and this methane is released to
Ruminant
Species of archaeon
Methanobrevibacter curvatus is a species of methanogen archaeon. It was first isolated from the hindgut of the termite Reticulitermes flavipes. It is rod-shaped
Methanobrevibacter_curvatus
Rod-shaped, gram-negative bacterium
when E. coli lives together with hydrogen-consuming organisms, such as methanogens or sulphate-reducing bacteria. In addition, E. coli's metabolism can
Escherichia_coli
Assessments of possible life on Mars
such as methanogens, are another possible source, but no direct evidence for the presence of such organisms has been found on Mars. Methanogens do not
Life_on_Mars
Chemical reaction
sulfate-reducing bacteria. Sulfate-reducing bacteria, iron-reducing bacteria, and methanogens are observed to be responsible for the formation of methylmercury in
Mercury_methylation
Organism that metabolizes molecular hydrogen
methanotrophs. Hydrogenotrophs belong to a group of organisms known as methanogens, organisms that carry out anaerobic processes that are responsible for
Hydrogenotroph
Respiration using electron acceptors other than oxygen
Desulfovibrionales, and Syntrophobacterales Methanogenesis (carbon dioxide reduction) Methanogens CO2 CH4 −0.25 Methanosarcina barkeri Sulfur respiration (sulfur reduction)
Anaerobic_respiration
Outermost layer of some cells
cell walls, all archaeal cell walls lack peptidoglycan, though some methanogens have a cell wall made of a similar polymer called pseudopeptidoglycan
Cell_wall
Species of bacterium
converting organic carbon into methane, a potent greenhouse gas. As a methanogen, Lutispora saccharofermentans plays a significant role in methane production
Lutispora_saccharofermentans
Species of archaeon
Methanosphaera stadtmanae is a methanogen archaeon. It is a non-motile, Gram-positive, spherical-shaped organism that obtains energy by using hydrogen
Methanosphaera_stadtmanae
Species of archaeon
Methanococcoides methylutens is a methylotrophic marine methanogen, the type species of its genus. It utilises trimethylamine, diethylamine, monomethylamine
Methanococcoides_methylutens
Class of enzymes
reduce methane emissions by promoting beneficial gut bacteria and reduce methanogens. It is a hydrolase, specifically a glycosidase that hydrolyses O- and
1,2-α-L-fucosidase
Oxygen-free break down of material
ammonia, hydrogen, and carbon dioxide, amongst other compounds. Finally, methanogens convert these products to methane and carbon dioxide. The methanogenic
Anaerobic_digestion
Order of archaea
Methanobacteriota. Methanomicrobiales are strictly carbon dioxide reducing methanogens, using hydrogen or formate as the reducing agent. As seen from the phylogenetic
Methanomicrobiales
Conversion of dinitrogen into ammonia
Anbar AD, Miller S, Hamilton TL, Lavin M, Peters JW (May 2011). "A late methanogen origin for molybdenum-dependent nitrogenase". Geobiology. 9 (3): 221–232
Nitrogen_fixation
Impact of farming animals on the environment
emissions quickly helps limit climate change. Gut flora in cattle include methanogens that produce methane as a byproduct of enteric fermentation, which cattle
Environmental impacts of animal agriculture
Environmental_impacts_of_animal_agriculture
Metabolic redox process producing energy in the absence of oxygen
oxidized by hydrogenase, producing H2. Hydrogen gas is a substrate for methanogens and sulfate reducers, which keep the concentration of hydrogen low and
Fermentation
Index of chemical compounds with the same name
Homoaconitase may refer to: Homoaconitate hydratase Methanogen homoaconitase This set index article lists chemical compounds articles associated with the
Homoaconitase
has been contested. "Putative filamentous microfossils," possibly of methanogens and/or methanotrophs that lived about 3.42-billion-year-old in "a paleo-subseafloor
Earliest_known_life_forms
Organism that consists of only one cell
5.2 M NaCl, including the genera Haloarcula, Haloferax, Halococcus. Methanogens are a significant subset of archaea and include many extremophiles, but
Unicellular_organism
JA, Chan MK (2002). "A new UAG-encoded residue in the structure of a methanogen methyltransferase". Science. 296 (5572): 1462–6. Bibcode:2002Sci...296
Lysine—tRNA(Pyl)_ligase
Species of archaeon
from humans in dental plaque and in their gastrointestinal tract. As a methanogen and a hydrogenotroph, this prokaryote can produce methane by using hydrogen
Methanobrevibacter_oralis
Chemical compound
required for methyl-transfer reactions in the metabolism of archaeal methanogens, and in the metabolism of other substrates in bacteria. It is also a
Coenzyme_M
Methanogenic pathway
nine steps. While Obligate CO 2 {\displaystyle {\ce {CO2}}} reducing methanogens perform additional steps to reduce CO2 to CH 3 {\displaystyle {\ce {CH3}}}
Wolfe_cycle
Species of archaeon
Methanolobus tindarius is a methanogen archaeon. It is marine, mesophilic, coccoid, lobal and monotrichous flagellated. They were isolated from coastal
Methanolobus_tindarius
Marine bacteria and marine archaea
acid mine drainage and other environmental damage. In the carbon cycle, methanogen archaea remove hydrogen and play an important role in the decay of organic
Marine_prokaryotes
Genus of archaea
methanogenesis to occur by a mechanism similar to that found in other methanogens. Archaeoglobus members are hyperthermophiles that can be found in hydrothermal
Archaeoglobus
Species of archaeon
Methanobrevibacter gottschalkii is a species of methanogen archaeon, named after Gerhard Gottschalk. It is a coccobacillus with rounded ends, about 0.7
Methanobrevibacter gottschalkii
Methanobrevibacter_gottschalkii
Site for the disposal of waste materials
and CO2 by methanogenic microorganisms. As VFAs are metabolized by the methanogens, the landfill water pH returns to neutrality. The leachate's organic
Landfill
the lanthanide elements are essential for some prokaryotes, such as methanogens. As shown in the following table, there is strong evidence that 19 of
Biological roles of the elements
Biological_roles_of_the_elements
Halobacteriaceae Family Halomonadaceae Genus Leptospira Genus Listeria Methanogens Suborder Micrococcineae Families Micromonosporaceae, Streptosporangiaceae
International Committee on Systematics of Prokaryotes
International_Committee_on_Systematics_of_Prokaryotes
Type of American intensive animal farming
Sirohi, S.K., Singh, K., Griffith, G.W. (2009). "Factors affecting rumen methanogens and methane mitigation strategies". World J. Microbiol Biotechnol, 25:1557–1566
Concentrated animal feeding operation
Concentrated_animal_feeding_operation
Species of archaeon
Methanothermus sociabilis is a species of methanogen. It grows in large clusters 1 to 3 mm in diameter and in temperatures of up to 97 °C (207 °F). It
Methanothermus_sociabilis
Species of bacterium
zehnderi is a bacterium. It is anaerobic, syntrophic (in association with methanogens, particularly Methanobacterium formicicum) and fatty‑acid‑oxidizing.
Syntrophomonas_zehnderi
Microorganisms in or on human skin and biofluids
group are the methanogens, particularly Methanobrevibacter smithii and Methanosphaera stadtmanae. However, colonization by methanogens is variable, and
Human_microbiome
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