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Aquificota

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Aquificota
Scientific classificationEdit this classification
Domain: Bacteria
Phylum: Aquificota
Reysenbach 2021[1]
Class
Synonyms
  • "Aquificae"Reysenbach 2001
  • "Aquithermota"Cavalier-Smith 2020
  • "Aquificota"Whitman et al. 2018
  • "Aquificaeota"Oren et al. 2015

TheAquificotaphylumis a diverse collection of bacteria that live in harsh environmental settings.[2][3]The nameAquificotawas given to this phylum based on an early genus identified within this group,Aquifex( “water maker” ), which is able to produce water by oxidizing hydrogen.[4]They have been found in springs, pools, and oceans. They areautotrophs,and are the primary carbon fixers in their environments. These bacteria areGram-negative,non-spore-formingrods.[5]They are true bacteria (domainBacteria) as opposed to the other inhabitants of extreme environments, theArchaea.

Taxonomy

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TheAquificotacurrently contain 15 genera and 42 validly published species.[6]The phylum comprises three class with each of them having their respective order.[7][8]Aquificales consists of the familiesAquificaceaeandHydrogenothermaceae,while theDesulfurobacteriaceaeare the only family within the Desulfurobacteriales.Thermosulfidibacter takaiiis not assigned to a family within the phylum based on its phylogenetic distinctness from both orders.[9]It is currently classified as a member of Aquificales, but it has shown more physiological similarity to the Desulfobacteriaceae.

Molecular signatures and phylogenetic position

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Comparative genomic studies have identified severalconserved signature indels(CSIs) that are specific for all species belonging to the phylumAquificotaand provide potential molecular markers.[8]The order Aquificales can be distinguished from Desulfobacteriales by several CSIs across different proteins that are specific for each group. Additional CSIs have been found at the family level, and can be used to demarcateAquificotaandHydrogenothermaceaefrom all other bacteria.[8]In parallel with the observed CSI distribution, the orders within theAquificotaare also physiologically distinct from one another. Members of the Desulfurobacteriales are strictanaerobesthat exclusively oxidize hydrogen for energy, whereas those belonging to the Aquificales aremicroaerophilic,and capable of oxidizing other compounds (such as sulfur or thiosulfate) in addition to hydrogen.[10][11][12]

Several CSIs have also been identified that are specific for the species from theAquificotaand provide potential molecular markers for this phylum.[2]Additionally, a 51-amino-acid insertion has been identified inSecApreprotein translocase which is shared by all members of theAquificota,as well as all members of the orderThermotogales.[13]Phylogenetic studies demonstrated that the presence of the same CSI within these two unrelated groups of bacteria is not due tolateral gene transfer,rather the CSI likely developed independently in these two groups of thermophiles due toselective pressure.[13]The 51 amino acid insertion is located on the surface of SecA near the binding site of ADP/ATP. Molecular dynamic simulations revealed a network water molecules forming an intermediate interaction between residues of the 51 aa CSI and ADP molecules, which serves to stabilize the hydrogen bonds formed between ADP/ATP and the protein. It is suggested that the network of hydrogen bonds formed between the water molecules, CSI residues and ADP/ATP helps to maintain ATP/ADP binding to the SecA protein at high temperatures, which contributes to the bacteria’s overall thermostability.[13]

In the 16S rRNA gene trees, theAquificotaspecies branch in the proximity of the phylumThermotogota(another phylum comprisinghyperthermophilicorganisms) close to the archaeal-bacterial branch point.[14][11]However, a close relationship of theAquificotato the Thermotogota and the deep branching of theAquificotais not supported by some phylogenetic studies based upon other gene/protein sequences[15][16][17][18]and also by CSIs in several highly conserved universal proteins 16S-23S-5S operons.[19]In contrast to the very high G+C content of their rRNAs (i.e. more than 62%), which is required for stability of their secondary structures at high growth temperatures,[20]the inference that theAquificotado not constitute a deep-branch lineage is also independently strongly supported by CSIs in a number of important proteins (viz. Hsp70, Hsp60, RpoB, RpoB and AlaRS), which support its placement in the proximity of the phylum Proteobacteria, particularly theCampylobacterota.[19]A specific relationship of theAquificotato the Proteobacteria is supported by a two-amino-acid CSI in the proteininorganic pyrophosphatase,which is uniquely found in species from these two phyla.[19]Cavalier-Smithhas also suggested that theAquificotaare closely related to the Proteobacteria.[21]In contrast to the above cited analyses that are based on a few indels or on single genes, analyses on informational genes, which appeared to be less often transferred to theAquifexlineage than noninformational genes, most often placed the Aquificales close to the Thermotogales.[22]These authors explain the frequently observed grouping ofAquificotawith Campylobacterota as result of frequenthorizontal gene transferdue to shared ecological niches.

Along with the Thermotogota, theAquificotaarethermophiliceubacteria.[3]

Phylogeny

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The currently accepted taxonomy is based on theList of Prokaryotic names with Standing in Nomenclature(LPSN)[23]andNational Center for Biotechnology Information(NCBI)[24][25]

16S rRNA basedLTP_08_2023[26][27][28] 120 single copy marker proteins basedGTDB08-RS214[29][30][31]
Aquificales
"Thermosulfidibacterota"
"Thermosulfidibacterales"

"Thermosulfidibacteraceae"Cavalier-Smith 2020 ex Chuvochina et al. 2023

"Thermosulfidibacteria"
Aquificota
"Desulfurobacteriia"
Desulfurobacteriales

DesulfurobacteriaceaeL'Haridon et al. 2006

"Aquificia"
"Hydrogenothermales"

HydrogenothermaceaeEder and Huber 2003

Aquificales


See also

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References

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  1. ^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.PMID34694987.S2CID239887308.
  2. ^abGriffiths E, Gupta RS (January 2006)."Molecular signatures in protein sequences that are characteristics of the phylum Aquificae".Int. J. Syst. Evol. Microbiol.56(Pt 1): 99–107.doi:10.1099/ijs.0.63927-0.PMID16403873.
  3. ^abHoriike T, Miyata D, Hamada K, et al. (January 2009)."Phylogenetic construction of 17 bacterial phyla by new method and carefully selected orthologs".Gene.429(1–2): 59–64.doi:10.1016/j.gene.2008.10.006.PMC2648810.PMID19000750.
  4. ^Huber R, Wilharm T, Huber D, Trincone A, Burggaf S, Konig H, Reinhard R, Rockinger I, Fricke H, Stetter K (1992). "Aquifex pyrophilus gen. nov. sp. nov., Represents a Novel Group of Marine Hyperthermophilic Hydrogen-Oxidizing Bacteria".Syst. Appl. Microbiol.15(3): 340–351.doi:10.1016/S0723-2020(11)80206-7.
  5. ^L'Haridon, Reysenbach AL, Tindall BJ, Schönheit P, Banta A, Johnsen U, Schumann P, Gambacorta A, Stackebrandt E, Jeanthon C (December 2006)."Desulfurobacterium atlanticum sp. nov., Desulfurobacterium pacificum sp. nov. and Thermovibrio guaymasensis sp. nov., three thermophilic members of the Desulfurobacteriaceae fam. nov., a deep branching lineage within the bacteria".Int. J. Syst. Evol. Microbiol.56(Pt 12): 2843–2852.doi:10.1099/ijs.0.63994-0.PMID17158986.
  6. ^J.P. Euzéby."Aquificae".List of Prokaryotic names with Standing in Nomenclature(LPSN). Archived fromthe originalon 2011-06-13.Retrieved2016-09-09.
  7. ^Oren A, Garrity GM (2015)."List of new names and new combinations previously effectively, but not validly, published".Int. J. Syst. Evol. Microbiol.65(7): 2017–2025.doi:10.1099/ijs.0.000317.PMC5817221.PMID28891789.
  8. ^abcGupta RS, Lali R (September 2013). "Molecular signatures for the phylum Aquificae and its different clades: Proposal for division of the phylum Aquificae into the emended order Aquificales, containing the families Aquificaceae and Hydrogenothermaceae, and a new order Desulfurobacterialesord. nov.,containing the family Desulfurobacteriaceae ".Antonie van Leeuwenhoek.104(3): 349–368.doi:10.1007/s10482-013-9957-6.PMID23812969.S2CID559778.
  9. ^Nunoura T, Oida H, Miyazaki M, Suzuki Y (March 2008)."Thermosulfidibacter takaii gen. nov., sp. nov., a thermophilic, hydrogen-oxidizing, sulfur-reducing chemolithoautotroph isolated from a deep-sea hydrothermal field in the Southern Okinawa Trough".Int. J. Syst. Evol. Microbiol.58(Pt 3): 659–665.doi:10.1099/ijs.0.65349-0.PMID18319474.
  10. ^Guiral M, Prunetti L, Aussignargues C, Ciaccafava A, Infossi P, Ilbert M, Lojou E, Giudici-Orticoni MT (2012). "The Hyperthermophilic Bacterium Aquifex aeolicus".The hyperthermophilic bacterium Aquifex aeolicus: from respiratory pathways to extremely resistant enzymes and biotechnological applications.Advances in Microbial Physiology. Vol. 61. pp. 125–194.doi:10.1016/B978-0-12-394423-8.00004-4.ISBN9780123944238.PMID23046953.{{cite book}}:|journal=ignored (help)
  11. ^abReysenbach, A.-L. (2001) Phylum BII. Thermotogae phy. nov. In: Bergey's Manual of Systematic Bacteriology, pp. 369-387. Eds D. R. Boone, R. W. Castenholz. Springer-Verlag: Berlin.
  12. ^Gupta, RS (2014) The Phylum Aquificae. The Prokaryotes 417-445. Springer Berlin Heidelberg.
  13. ^abcKhadka, Bijendra; Persaud, Dhillon; Gupta, Radhey S. (2019-12-29)."Novel Sequence Feature of SecA Translocase Protein Unique to the Thermophilic Bacteria: Bioinformatics Analyses to Investigate Their Potential Roles".Microorganisms.8(1): 59.doi:10.3390/microorganisms8010059.ISSN2076-2607.PMC7023208.PMID31905784.
  14. ^Huber, R. and Hannig, M. (2006) Thermotogales. Prokaryotes 7: 899-922.
  15. ^Klenk, H. P., Meier, T. D., Durovic, P. and others (1999) RNA polymerase ofAquifex pyrophilus:Implications for the evolution of the bacterial rpoBC operon and extremely thermophilic bacteria. J Mol Evol 48: 528-541.
  16. ^Gupta, R. S. (2000) The phylogeny of Proteobacteria: relationships to other eubacterial phyla and eukaryotes. FEMS Microbiol Rev 24: 367-402.
  17. ^Ciccarelli, F. D., Doerks, T., von Mering, C., Creevey, C. J., Snel, B., and Bork, P. (2006) Toward automatic reconstruction of a highly resolved tree of life. Science 311: 1283-1287.
  18. ^Di Giulio, M. (2003) The universal ancestor was a thermophile or a hyperthermophile: Tests and further evidence. J Theor Biol 221: 425-436.
  19. ^abcGriffiths, E. and Gupta, R. S. (2004) Signature sequences in diverse proteins provide evidence for the late divergence of the order Aquificales. International Microbiol 7: 41-52.
  20. ^Meyer, T. E. and Bansal, A. K. (2005) Stabilization against hyperthermal denaturation through increased CG content can explain the discrepancy between whole genome and 16S rRNA analyses. Biochemistry 44: 11458-11465.
  21. ^Catalogue of Organisms: Standing the Heat
  22. ^Boussau B, Guéguen L, Gouy M. Accounting for horizontal gene transfers explains conflicting hypotheses regarding the position of Aquificales in the phylogeny of Bacteria. BMC Evol Biol. 2008 Oct 3;8:272.doi:10.1186/1471-2148-8-272.
  23. ^J.P. Euzéby."Aquificota".List of Prokaryotic names with Standing in Nomenclature(LPSN).Retrieved2022-09-09.
  24. ^Sayers; et al."Aquificae".National Center for Biotechnology Information(NCBI) taxonomy database.Retrieved2022-09-09.
  25. ^Ludwig, W.; Euzéby, J. & Whitman W.B. (2008)."Bergey's Taxonomic Outlines: Volume 4 - Draft Taxonomic Outline of the Bacteroidetes, Planctomycetes, Chlamydiae, Spirochaetes, Fibrobacteres, Fusobacteria, Acidobacteria, Verrucomicrobia, Dictyoglomi, and Gemmatimonadetes"(PDF).Bergey's Manual Trust:15. Archived fromthe original(PDF)on 2009-04-24.Retrieved2011-06-27.
  26. ^"The LTP".Retrieved20 November2023.
  27. ^"LTP_all tree in newick format".Retrieved20 November2023.
  28. ^"LTP_08_2023 Release Notes"(PDF).Retrieved20 November2023.
  29. ^"GTDB release 08-RS214".Genome Taxonomy Database.Retrieved10 May2023.
  30. ^"bac120_r214.sp_label".Genome Taxonomy Database.Retrieved10 May2023.
  31. ^"Taxon History".Genome Taxonomy Database.Retrieved10 May2023.
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