Methanocaldococcus

Methanocaldococcus formerly known as Methanococcus is a genus of coccoid methanogen archaea.^[1] They are all mesophiles, except the thermophilic M. thermolithotrophicus and the hyperthermophilic M. jannaschii. The latter was discovered at the base of a “white smoker” chimney at 21°N on the East Pacific Rise^[2] and it was the first archaean genome to be completely sequenced, revealing many novel and eukaryote-like elements.^[3]

Methanocaldococcus
Scientific classification
Domain:	Archaea
Kingdom:	Euryarchaeota
Phylum:	Euryarchaeota
Class:	Methanococci
Order:	Methanococcales
Family:	Methanocaldococcaceae
Genus:	Methanocaldococcus Whitman 2002
Type species
Methanocaldococcus jannaschii (Jones et al. 1984) Whitman 2002
Species
M. bathoardescens M. fervens M. indicus M. infernus M. jannaschii M. lauensis M. villosus M. vulcanius

Nomenclature

The name Methanocaldococcus has Latin and Greek roots, methano for methane, caldo for hot, and the Greek kokkos for the spherical shape of the cells. Overall, the name means spherical cell that produces methane at hot temperatures.^[4]

Metabolism

All species in Methanocaldococcus are obligate methanogens. They use hydrogen to reduce carbon dioxide. Unlike many other species within Euryarchaeota, they cannot use formate, acetate, methanol or methylamines as substrates.^[4]

Phylogeny

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) ^[5] and National Center for Biotechnology Information (NCBI).^[6]

16S rRNA based LTP_06_2022[7][8][9]	53 marker proteins based GTDB 09-RS220[10][11][12]
Methanocaldococcaceae M. villosus Bellack et al. 2011 M. indicus L'Haridon et al. 2003 M. infernus (Jeanthon et al. 1998) Whitman 2002 M. vulcanius (Jeanthon et al. 1999) Whitman 2002 M. jannaschii (Jones et al. 1984) Whitman 2002 (type sp.) M. fervens (Jeanthon et al. 1999) Whitman 2002 M. bathoardescens Stewart et al. 2015 M. lauensis L'Haridon et al. 2023 Methanocaldococcus	Methanocaldococcaceae M. villosus M. infernus M. lauensis L'Haridon et al. 2023 M. bathoardescens M. fervens M. jannaschii M. vulcanius Methanocaldococcus

See also

• List of Archaea genera
• Methanocaldococcus sp. FS406-22

References

1. See the NCBI webpage on Methanocaldococcus. Data extracted from the "NCBI taxonomy resources". National Center for Biotechnology Information. Retrieved 2007-03-19.
2. W.J. Jones; et al. (December 1983). "Methanococcus jannaschii sp. nov., an extremely thermophilic methanogen from a submarine hydrothermal vent". Arch. Microbiol. 136 (4): 254–261. doi:10.1007/BF00425213. S2CID 33277659.
3. C.J. Bult; et al. (August 1996). "Complete genome sequence of the methanogenic archaeon, Methanococcus jannaschii". Science. 273 (5278): 1058–1073. Bibcode:1996Sci...273.1058B. doi:10.1126/science.273.5278.1058. PMID 8688087. S2CID 41481616.
4. David R. Boone; Richard W. Castenholz, eds. (2012-01-13). Bergey's Manual of Systematic Bacteriology. Vol. 1 (2 ed.). Nueva York: Springer Science and Business Media. p. 243. doi:10.1007/978-0-387-21609-6. ISBN 978-1-4419-3159-7. S2CID 41426624. Retrieved 2016-07-27.
5. J.P. Euzéby. "Methanococcales". List of Prokaryotic names with Standing in Nomenclature (LPSN). Archived from the original on 2013-01-27. Retrieved 2011-11-17.
6. Sayers; et al. "Methanococcales". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2011-06-05.
7. "The LTP". Retrieved 10 May 2023.
8. "LTP_all tree in newick format". Retrieved 10 May 2023.
9. "LTP_06_2022 Release Notes" (PDF). Retrieved 10 May 2023.
10. "GTDB release 09-RS220". Genome Taxonomy Database. Retrieved 10 May 2024.
11. "ar53_r220.sp_label". Genome Taxonomy Database. Retrieved 10 May 2024.
12. "Taxon History". Genome Taxonomy Database. Retrieved 10 May 2024.

Further reading

• Whitman, WB (2001). "Genus I. Methanocaldococcus gen. nov.". In DR Boone; RW Castenholz (eds.). Bergey's Manual of Systematic Bacteriology Volume 1: The Archaea and the deeply branching and phototrophic Bacteria (2nd ed.). New York: Springer Verlag. ISBN 978-0-387-98771-2.
• Whitman WB; Boone DR; Koga Y (2001). "Family II. Methanocaldococcaceae fam. nov.". In DR Boone; RW Castenholz (eds.). Bergey's Manual of Systematic Bacteriology Volume 1: The Archaea and the deeply branching and phototrophic Bacteria (2nd ed.). New York: Springer Verlag. ISBN 978-0-387-98771-2.

External links

• Information on type species 'Methanocaldococcus jannaschii'
• Methanocaldococcus at BacDive - the Bacterial Diversity Metadatabase