| 词条 | Epsilonproteobacteria |
| 释义 |
| name = Epsilonproteobacteria | image = ARS Campylobacter jejuni.jpg | image_caption = Campylobacter | taxon = Epsilonproteobacteria | subdivision_ranks = Orders | subdivision =
}} 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] PhylogenyThe 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] {{Clade|1={{clade |label1= Nautiliaceae |1={{clade |1=Thioreductor micantisoli Nakagawa et al.2005 |2={{clade |1=Caminibacter Alain et al.2002 |2={{clade |1=Lebetimonas acidiphila Takai et al.2005 |2=Nautilia Miroshnichenko et al.2002 }} }} }} |2={{clade |1=Nitratiruptor tergarcus Nakagawa et al.2 |label2= Campylobacterales |2={{clade |1=Hydrogenimonas thermophila Takai et al.2004 |2={{clade |1=?Sulfuricurvum kujiense Kodama and Watanabe 2004 |2=?Thiovulum majus ♪ Hinze 1913 |3={{clade |1={{clade |1=Nitratifractor salsuginis Nakagawa et al.2005 |2=Sulfurovum lithotrophicum Inagaki et al.2004 |2=Sulfurimonas Inagaki et al.2003 emend. Takai et al.2006 |4={{clade |label1= Helicobacteraceae |1={{clade |1=Wolinella Tanner et al.1981 |2=Helicobacter Goodwin et al.1989 emend. Vandamme et al.1991 |label2= Campylobacteraceae |2={{clade |1=?Candidatus Thioturbo danicus Muyzer et al. 2005 |2=Arcobacter Vandamme et al.1991 emend. Vandamme et al.1992 |3={{clade |1=Sulfurospirillum Schumacher et al.1993 emend. Luijten et al.2003 |2=Campylobacter Sebald and Véron 1963 emend. Vandamme et al.2010 }} }} }} }} }} }} }} }} Notes:
References1. ^{{cite web |url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&id=29547 |title=www.ncbi.nlm.nih.gov |format= |website= |accessdate=2009-03-19}} 2. ^{{Cite journal| doi = 10.1099/ijs.0.02682-0| issn = 1466-5026| volume = 53| issue = 6| pages = 1801–1805| last = Inagaki| first = F.| title = Sulfurimonas autotrophica gen. nov., sp. nov., a novel sulfur-oxidizing -proteobacterium isolated from hydrothermal sediments in the Mid-Okinawa Trough| journal = International Journal of Systematic and Evolutionary Microbiology| date = 2003-11-01| pmid=14657107}} 3. ^{{Cite journal| doi = 10.1099/ijs.0.64255-0| issn = 1466-5026| volume = 56| issue = 8| pages = 1725–1733| last = Takai| first = K.| title = 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| journal = International Journal of Systematic and Evolutionary Microbiology| date = 2006-08-01| pmid=16901999}} 4. ^{{Cite journal| doi = 10.1099/ijs.0.03042-0| issn = 1466-5026| volume = 54| issue = 5| pages = 1477–1482| last = Inagaki| first = Fumio|author2=Ken Takai |author3=Kenneth H. Nealson |author4=Koki Horikoshi | title = Sulfurovum lithotrophicum gen. nov., sp. nov., a novel sulfur-oxidizing chemolithoautotroph within the ε-Proteobacteria isolated from Okinawa Trough hydrothermal sediments| journal = International Journal of Systematic and Evolutionary Microbiology| accessdate = 2013-06-27| date = 2004-09-01| url = http://ijs.sgmjournals.org/content/54/5/1477 | pmid=15388698}} 5. ^{{cite journal |author1=Julie L. Smith |author2=Barbara J. Campbell |author3=Thomas E. Hanson |author4=Chuanlun L. Zhang |author5=S. Craig Cary |year=2008 |title=Nautilia profundicola sp. nov., a thermophilic, sulfur-reducing epsilonproteobacterium from deep-sea hydrothermal vents |journal=International Journal of Systematic and Evolutionary Microbiology |volume=58 |issue=7 |pages=1598–1602 |pmid=18599701 |doi=10.1099/ijs.0.65435-0}} 6. ^{{cite journal | last1 = Suzuki | first1 = Yohey | last2 = Sasaki | first2 = Takenori | last3 = Suzuki | first3 = Masae | last4 = Nogi | first4 = Yuichi | last5 = Miwa | first5 = Tetsuya | last6 = Takai | first6 = Ken | last7 = Nealson | first7 = Kenneth H. | last8 = Horikoshi | first8 = Koki | year = 2005 | title = Novel Chemoautotrophic Endosymbiosis between a Member of the Epsilonproteobacteria and the Hydrothermal-Vent Gastropod Alviniconcha aff. hessleri (Gastropoda: Provannidae) from the Indian Ocean | doi = 10.1128/AEM.71.9.5440-5450.2005 | pmid = 16151136 | journal = Applied and Environmental Microbiology | volume = 71 | issue = 9| pages = 5440–5450 | pmc = 1214688 }} 7. ^{{cite journal |url=http://aem.asm.org/cgi/reprint/71/11/7310.pdf |title=Enzymatic and genetic characterization of carbon and energy metabolisms by deep-sea hydrothermal chemolithoautotrophic isolates of Epsilonproteobacteria |journal=Applied and Environmental Microbiology |year=2005 |volume=71 |issue=11 |pages=7310–7320 |first=Ken |last=Takai |doi=10.1128/aem.71.11.7310-7320.2005|display-authors=etal |pmid=16269773 |pmc=1287660}} 8. ^{{Cite journal| doi = 10.1038/nrmicro1414| pmid = 16652138| issn = 1740-1526| volume = 4| issue = 6| pages = 458–468| last = Campbell| first = Barbara J.|author2=Annette Summers Engel |author3=Megan L. Porter |author4=Ken Takai | title = The versatile ε-proteobacteria: key players in sulphidic habitats| journal = Nature Reviews Microbiology| date = 2006-05-02}} 9. ^{{Cite journal| doi = 10.1126/science.1069651| volume = 297| issue = 5584| pages = 1137–1142| last = Anbar| first = A. D.| author2 = A. H. Knoll| title = Proterozoic Ocean Chemistry and Evolution: A Bioinorganic Bridge?| journal = Science| date = 2002-08-16| pmid=12183619| citeseerx = 10.1.1.615.3041}} 10. ^{{cite web|author=J.P. Euzéby |url=http://www.bacterio.cict.fr/classifphyla.html#Proteobacteria |title=Epsilonproteobacteria |accessdate=2011-11-17 |publisher=List of Prokaryotic names with Standing in Nomenclature (LPSN) |deadurl=yes |archiveurl=https://web.archive.org/web/20111007174053/http://www.bacterio.cict.fr/classifphyla.html |archivedate=2011-10-07 |df= }} 11. ^{{cite web |author = Sayers| url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Undef&id=29547&lvl=4&lin |title=Epsilonproteobacteria |accessdate=2011-06-05 |publisher=National Center for Biotechnology Information (NCBI) taxonomy database|display-authors=etal}} 12. ^'The All-Species Living Tree' Project.{{cite web | url=http://www.arb-silva.de/fileadmin/silva_databases/living_tree/LTP_release_106/LTPs106_SSU_tree.pdf | title=16S rRNA-based LTP release 106 (full tree) | publisher=Silva Comprehensive Ribosomal RNA Database | accessdate=2011-11-17}} External links
2 : Proteobacteria|Epsilonproteobacteria |
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