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Campylobacteria

From Wikipedia, the free encyclopedia

Campylobacteria
Campylobacter jejuni bacteria
Scientific classification Edit this classification
Domain: Bacteria
Phylum: Campylobacterota
Class: "Campylobacteria"
Waite et al. 2017
Orders
Synonyms
  • "Epsilobacteria" Cavalier-Smith 2002
  • Epsilonproteobacteria Garrity et al. 2006
  • "Nautiliia" Cavalier-Smith 2020

The Campylobacteria are a class of Gram-negative bacteria. It used to be known as Epsilonproteobacteria.[1][a] Only a few genera have been characterized, including the curved to spirilloid Wolinella, Helicobacter, and Campylobacter.

Most of the known species inhabit the digestive tracts of animals and serve as symbionts (Wolinella spp. in cattle) or pathogens (Helicobacter spp. in the stomach, Campylobacter spp. in the duodenum). However, numerous environmental sequences and isolates of Campylobacteria have been recovered from hydrothermal vents and cold seep habitats. Examples of isolates include Sulfurimonas autotrophica,[3] Sulfurimonas paralvinellae,[4] Sulfurovum lithotrophicum[5] and Nautilia profundicola.[6] A member of the phylum Campylobacterota occurs as an endosymbiont in the large gills of the deepwater sea snail Alviniconcha hessleri.[7]

Many Campylobacteria are motile with flagella.[8] The Campylobacteria found at deep-sea hydrothermal vents characteristically exhibit chemolithotrophy, meeting their energy needs by oxidizing reduced sulfur, formate, or hydrogen coupled to the reduction of nitrate or oxygen.[9] Autotrophic Campylobacteria use the reverse Krebs cycle to fix carbon dioxide into biomass, a pathway originally thought to be of little environmental significance. The oxygen sensitivity of this pathway is consistent with their microaerophilic or anaerobic niche in these environments, and their likely evolution in the Mesoproterozoic oceans,[10] which are thought to have been sulfidic with low levels of oxygen available from cyanobacterial photosynthesis.[11]

References

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  1. ^ By taxonomic rules, the old "Epsilonproteobacteria" should be preferred and the newer name treated as a later synonym.[2] The proposed name does have the effect of solidifying the class's removal from Proteobacteria.
  1. ^ Waite, David W.; Vanwonterghem, Inka; Rinke, Christian; Parks, Donovan H.; Zhang, Ying; Takai, Ken; Sievert, Stefan M.; Simon, Jörg; Campbell, Barbara J.; Hanson, Thomas E.; Woyke, Tanja; Klotz, Martin G.; Hugenholtz, Philip (2017). "Comparative Genomic Analysis of the Class Epsilonproteobacteria and Proposed Reclassification to Epsilonbacteraeota (phyl. nov.)". Frontiers in Microbiology. 8: 682. doi:10.3389/fmicb.2017.00682. ISSN 1664-302X. PMC 5401914. PMID 28484436.
  2. ^ Oren A, Garrity GM (2021). "Valid publication of the names of forty-two phyla of prokaryotes". Int J Syst Evol Microbiol. 71 (10): 5056. doi:10.1099/ijsem.0.005056. PMID 34694987. S2CID 239887308.
  3. ^ Inagaki, F. (2003-11-01). "Sulfurimonas autotrophica gen. nov., sp. nov., a novel sulfur-oxidizing -proteobacterium isolated from hydrothermal sediments in the Mid-Okinawa Trough". International Journal of Systematic and Evolutionary Microbiology. 53 (6): 1801–1805. doi:10.1099/ijs.0.02682-0. ISSN 1466-5026. PMID 14657107.
  4. ^ Takai, K. (2006-08-01). "Sulfurimonas paralvinellae sp. nov., a novel mesophilic, hydrogen- and sulfur-oxidizing chemolithoautotroph within the Epsilonproteobacteria isolated from a deep-sea hydrothermal vent polychaete nest, reclassification of Thiomicrospira denitrificans as Sulfurimonas denitrificans comb. nov. and emended description of the genus Sulfurimonas". International Journal of Systematic and Evolutionary Microbiology. 56 (8): 1725–1733. doi:10.1099/ijs.0.64255-0. ISSN 1466-5026. PMID 16901999.
  5. ^ Inagaki, Fumio; Ken Takai; Kenneth H. Nealson; Koki Horikoshi (2004-09-01). "Sulfurovum lithotrophicum gen. nov., sp. nov., a novel sulfur-oxidizing chemolithoautotroph within the ε-Proteobacteria isolated from Okinawa Trough hydrothermal sediments". International Journal of Systematic and Evolutionary Microbiology. 54 (5): 1477–1482. doi:10.1099/ijs.0.03042-0. ISSN 1466-5026. PMID 15388698.
  6. ^ Julie L. Smith; Barbara J. Campbell; Thomas E. Hanson; Chuanlun L. Zhang; S. Craig Cary (2008). "Nautilia profundicola sp. nov., a thermophilic, sulfur-reducing epsilonproteobacterium from deep-sea hydrothermal vents". International Journal of Systematic and Evolutionary Microbiology. 58 (7): 1598–1602. doi:10.1099/ijs.0.65435-0. PMID 18599701. S2CID 12751566.
  7. ^ Suzuki, Yohey; Sasaki, Takenori; Suzuki, Masae; Nogi, Yuichi; Miwa, Tetsuya; Takai, Ken; Nealson, Kenneth H.; Horikoshi, Koki (2005). "Novel Chemoautotrophic Endosymbiosis between a Member of the Epsilonproteobacteria and the Hydrothermal-Vent Gastropod Alviniconcha aff. hessleri (Gastropoda: Provannidae) from the Indian Ocean". Applied and Environmental Microbiology. 71 (9): 5440–5450. Bibcode:2005ApEnM..71.5440S. doi:10.1128/AEM.71.9.5440-5450.2005. PMC 1214688. PMID 16151136.
  8. ^ Beeby, M (December 2015). "Motility in the epsilon-proteobacteria". Current Opinion in Microbiology. 28: 115–21. doi:10.1016/j.mib.2015.09.005. hdl:10044/1/27763. PMID 26590774.
  9. ^ Takai, Ken; et al. (2005). "Enzymatic and genetic characterization of carbon and energy metabolisms by deep-sea hydrothermal chemolithoautotrophic isolates of Epsilonproteobacteria". Applied and Environmental Microbiology. 71 (11): 7310–7320. Bibcode:2005ApEnM..71.7310T. doi:10.1128/aem.71.11.7310-7320.2005. PMC 1287660. PMID 16269773.
  10. ^ Campbell, Barbara J.; Engel, Annette Summers; Porter, Megan L.; Takai, Ken (2006-05-02). "The versatile ε-proteobacteria: key players in sulphidic habitats". Nature Reviews Microbiology. 4 (6): 458–468. doi:10.1038/nrmicro1414. ISSN 1740-1526. PMID 16652138. S2CID 10479314.
  11. ^ Anbar, A. D.; A. H. Knoll (2002-08-16). "Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?". Science. 297 (5584): 1137–1142. Bibcode:2002Sci...297.1137A. CiteSeerX 10.1.1.615.3041. doi:10.1126/science.1069651. PMID 12183619. S2CID 5578019.
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