Related Research Articles
Nanoarchaeum equitans is a species of marine archaea that was discovered in 2002 in a hydrothermal vent off the coast of Iceland on the Kolbeinsey Ridge by Karl Stetter. It has been proposed as the first species in a new phylum. Strains of this microbe were also found on the Sub-polar Mid Oceanic Ridge, and in the Obsidian Pool in Yellowstone National Park. Since it grows in temperatures approaching boiling, at about 80 degrees Celsius, it is considered to be a thermophile. It grows best in environments with a pH of 6, and a salinity concentration of 2%. Nanoarchaeum appears to be an obligate symbiont on the archaeon Ignicoccus; it must be in contact with the host organism to survive. Nanoarchaeum equitans cannot synthesize lipids but obtains them from its host. Its cells are only 400 nm in diameter, making it one of the smallest known cellular organisms, and the smallest known archaeon.
Ferroglobus is a genus of the Archaeoglobaceae.
Sulfolobus is a genus of microorganism in the family Sulfolobaceae. It belongs to the archaea domain.
Geoglobus is a hyperthermophilic member of the Archaeoglobaceae within the Euryarchaeota. It consists of two species, the first, G. ahangari, isolated from the Guaymas Basin hydrothermal system located deep within the Gulf of California. As a hyperthermophile, it grows best at a temperature of 88 °C and cannot grow at temperatures below 65 °C or above 90 °C. It possess an S-layer cell wall and a single flagellum. G. ahangari is an anaerobe, using poorly soluble ferric iron (Fe3+) as a terminal electron acceptor. It can grow either autotrophically using hydrogen gas (H2) or heterotrophically using a large number of organic compounds, including several types of fatty acids, as energy sources. G. ahangari was the first archaeon isolated capable of using hydrogen gas coupled to iron reduction as an energy source and the first anaerobe isolated capable of using long-chain fatty acids as an energy source.
Ignicoccus is a genus of Archaea living in marine hydrothermal vents. They were discovered in Kolbeinsey Ridge north of Iceland and in the Pacific Ocean in 2000.
Pyrobaculum is a genus of the Thermoproteaceae.
In taxonomy, Aeropyrum is a genus of the Desulfurococcaceae.
Aeropyrum pernix is a species of extremophile archaean in the archaean phylum Crenarchaeota. It is an obligatorily thermophilic species. The first specimens were isolated from sediments in the sea off the coast of Japan.
Archaea constitute a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria, but this term has fallen out of use.
The Thaumarchaeota or Thaumarchaea are a phylum of the Archaea proposed in 2008 after the genome of Cenarchaeum symbiosum was sequenced and found to differ significantly from other members of the hyperthermophilic phylum Crenarchaeota. Three described species in addition to C. symbosium are Nitrosopumilus maritimus, Nitrososphaera viennensis, and Nitrososphaera gargensis. The phylum was proposed in 2008 based on phylogenetic data, such as the sequences of these organisms' ribosomal RNA genes, and the presence of a form of type I topoisomerase that was previously thought to be unique to the eukaryotes. This assignment was confirmed by further analysis published in 2010 that examined the genomes of the ammonia-oxidizing archaea Nitrosopumilus maritimus and Nitrososphaera gargensis, concluding that these species form a distinct lineage that includes Cenarchaeum symbiosum. The lipid crenarchaeol has been found only in Thaumarchaea, making it a potential biomarker for the phylum. Most organisms of this lineage thus far identified are chemolithoautotrophic ammonia-oxidizers and may play important roles in biogeochemical cycles, such as the nitrogen cycle and the carbon cycle. Metagenomic sequencing indicates that they constitute ~1% of the sea surface metagenome across many sites.
Globuloviridae is a family of hyperthermophilic archaeal viruses. Crenarchaea of the genera Pyrobaculum and Thermoproteus serve as natural hosts. There are currently only two species in this family, Pyrobaculum spherical virus and Thermoproteus tenax spherical virus 1, included into a single genus, Globulovirus. Two tentative members of the family, Pyrobaculum spherical virus 2 and Thermoproteus spherical piliferous virus 1 have been isolated but not officially classified.
Thermotoga maritima is a hyperthermophilic, anaerobic organism that is a member of the order Thermotogales. It employs [FeFe]-hydrogenases to produce hydrogen gas (H2) by fermenting many different types of carbohydrates.
Methanothermus fervidus is a species of methanogen. It is notable for being extremely thermophilic. Its cells are rod-shaped; its complex cell envelope exhibits two layers, each about 12 nm thick; the inner represents the pseudomurein sacculus and the outer a protein envelope. The type strain is Methanothermus fervidus Stetter 1982. The cells are motile, strictly anaerobic and stain Gram positive. They can grow at temperatures as high as 97 °C. Strain V24ST can subsist on carbon dioxide and hydrogen alone. Its genome is 1,243,342 bp in length.
Pyrococcus horikoshii is a hyperthermophilic, anaerobic archaeon, first isolated from hydrothermal fluid samples obtained at the Okinawa Trough vents at a depth of 1,395 metres (4,577 ft). It is obligately heterotrophic, cells are irregular cocci with a tuft of flagella, growing optimally at 98 °C, sulphur greatly enhancing its growth.
Thermotoga naphthophila is a hyperthermophilic, anaerobic, non-spore-forming, rod-shaped fermentative heterotroph, with type strain RKU-10T.
Thermococcus profundus is a hyperthermophilic archaeon isolated from a deep-sea hydrothermal vent. It is coccoid-shaped with 1–2 μm in diameter, designated as strain DT5432.
Thermococcus barophilus is a barophilic and hyperthermophilic archaeon isolated from a deep-sea hydrothermal vent. It is anaerobic and sulfur-metabolising, with type strain MPT.
Saccharolobus solfataricus is a species of thermophilic archaeon. It was transferred from the genus Sulfolobus to the new genus Saccharolobus with the description of Saccharolobus caldissimus in 2018.
References
- 1 2 3 Völkl P; Huber R; Drobner E; et al. (September 1993). "Pyrobaculum aerophilum sp. nov., a novel nitrate-reducing hyperthermophilic archaeum". Applied and Environmental Microbiology . 59 (9): 2918–26. doi:10.1128/AEM.59.9.2918-2926.1993. PMC 182387 . PMID 7692819.
- ↑ Ausili, Alessio; Vitale, Annalisa; Labella, Tullio; Rosso, Francesco; et al. (2012). "Alcohol dehydrogenase from the hyperthermophilic archaeon Pyrobaculum aerophilum: Stability at high temperature". Archives of Biochemistry and Biophysics. 525 (1): 40–46. doi:10.1016/j.abb.2012.05.019. ISSN 0003-9861. PMID 22683471.
- ↑ Cozen, A. E.; Weirauch, M. T.; Pollard, K. S.; Bernick, D. L.; et al. (2008). "Transcriptional Map of Respiratory Versatility in the Hyperthermophilic Crenarchaeon Pyrobaculum aerophilum". Journal of Bacteriology. 191 (3): 782–794. doi:10.1128/JB.00965-08. ISSN 0021-9193. PMC 2632070 . PMID 19047344.
- ↑ Fitz-Gibbon, Sorel T.; Ladner, Heidi; Kim, Ung-Jin; Stetter, Karl O.; Simon, Melvin I.; Miller, Jeffrey H. (2002-01-22). "Genome sequence of the hyperthermophilic crenarchaeon Pyrobaculum aerophilum". Proceedings of the National Academy of Sciences of the United States of America. 99 (2): 984–989. Bibcode:2002PNAS...99..984F. doi:10.1073/pnas.241636498. ISSN 0027-8424. PMC 117417 . PMID 11792869.
