Epsilonproteobacteria

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Epsilonproteobacteria
ARS Campylobacter jejuni.jpg
Campylobacter
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Epsilonproteobacteria
Orders

Epsilonproteobacteria are a class of Proteobacteria.[1] All species of this class are, like all Proteobacteria, Gram-negative.

The Epsilonproteobacteria consist of few known genera, mainly the curved to spirilloid Wolinella spp., Helicobacter spp., and Campylobacter spp. 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).

Numerous environmental sequences and isolates of Epsilonproteobacteria have also been recovered from hydrothermal vents and cold seep habitats. Examples of isolates include Sulfurimonas autotrophica,[2] Sulfurimonas paralvinellae,[3]Sulfurovum lithotrophicum[4] and Nautilia profundicola.[5] A member of the class Epsilonproteobacteria occurs as an endosymbiont in the large gills of the deepwater sea snail Alviniconcha hessleri.[6]

The Epsilonproteobacteria 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.[7] Autotrophic Epsilonproteobacteria 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,[8] which are thought to have been sulfidic with low levels of oxygen available from cyanobacterial photosynthesis.[9]

Phylogeny

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [10] and National Center for Biotechnology Information (NCBI)[11] and the phylogeny is based on 16S rRNA-based LTP release 106 by 'The All-Species Living Tree' Project [12]


  Nautiliaceae

Thioreductor micantisoli Nakagawa et al.2005




Caminibacter Alain et al.2002




Lebetimonas acidiphila Takai et al.2005



Nautilia Miroshnichenko et al.2002







Nitratiruptor tergarcus Nakagawa et al.2


  Campylobacterales

Hydrogenimonas thermophila Takai et al.2004




?Sulfuricurvum kujiense Kodama and Watanabe 2004



?Thiovulum majusHinze 1913





Nitratifractor salsuginis Nakagawa et al.2005



Sulfurovum lithotrophicum Inagaki et al.2004




Sulfurimonas Inagaki et al.2003 emend. Takai et al.2006




  Helicobacteraceae

Wolinella Tanner et al.1981



Helicobacter Goodwin et al.1989 emend. Vandamme et al.1991



  Campylobacteraceae

?Candidatus Thioturbo danicus Muyzer et al. 2005



Arcobacter Vandamme et al.1991 emend. Vandamme et al.1992




Sulfurospirillum Schumacher et al.1993 emend. Luijten et al.2003



Campylobacter Sebald and Véron 1963 emend. Vandamme et al.2010









Notes:

  • Prokaryotes where no pure (axenic) cultures are isolated or available, i.e. not cultivated or can not be sustained in culture for more than a few serial passages

References

  1. "www.ncbi.nlm.nih.gov". Retrieved 2009-03-19.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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  10. J.P. Euzéby. "Epsilonproteobacteria". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved 2011-11-17.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. Sayers; et al. "Epsilonproteobacteria". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2011-06-05.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. 'The All-Species Living Tree' Project."16S rRNA-based LTP release 106 (full tree)" (PDF). Silva Comprehensive Ribosomal RNA Database. Retrieved 2011-11-17.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

External links