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Pseudomonadota have a wide variety of [[metabolism]] types. Most are facultative or obligate [[Anaerobic organism|anaerobes]], [[chemolithoautotrophic|chemolithoautotrophs]], and [[heterotrophic|heterotrophs]], though numerous exceptions exist. A variety of distantly related genera within the Pseudomonadota, obtain their energy from light through conventional [[photosynthesis]] or [[anoxygenic photosynthesis]].<ref name=":4" />
Pseudomonadota have a wide variety of [[metabolism]] types. Most are facultative or obligate [[Anaerobic organism|anaerobes]], [[chemolithoautotrophic|chemolithoautotrophs]], and [[heterotrophic|heterotrophs]], though numerous exceptions exist. A variety of distantly related genera within the Pseudomonadota, obtain their energy from light through conventional [[photosynthesis]] or [[anoxygenic photosynthesis]].<ref name=":4" />


The [[Acidithiobacillia]] contain only sulfur, iron, and uranium-oxidizing [[Autotroph|autotrophs]]. The type order is the [[Acidithiobacillales|Acidithiobacillaceae]], which includes five different ''Acidthiobacillus'' species used in the mining industry. In particular, these microbes assist with the process of [[bioleaching]], which involves microbes assisting in metal extraction from mining waste that typically extraction methods cannot remove. At present, they are most often used for recovering copper and uranium.<ref>{{Citation |last=Kelly |first=Donovan P. |title=The Family Acidithiobacillaceae |date=2014 |work=The Prokaryotes: Gammaproteobacteria |pages=15–25 |editor-last=Rosenberg |editor-first=Eugene |url=https://doi.org/10.1007/978-3-642-38922-1_250 |access-date=2024-04-18 |place=Berlin, Heidelberg |publisher=Springer |language=en |doi=10.1007/978-3-642-38922-1_250#sec9 |isbn=978-3-642-38922-1 |last2=Wood |first2=Ann P. |editor2-last=DeLong |editor2-first=Edward F. |editor3-last=Lory |editor3-first=Stephen |editor4-last=Stackebrandt |editor4-first=Erko}}</ref>
The [[Acidithiobacillia]] contain only sulfur, iron, and uranium-oxidizing [[Autotroph|autotrophs]]. The type order is the [[Acidithiobacillales|Acidithiobacillaceae]], which includes five different ''Acidthiobacillus'' species used in the mining industry. In particular, these microbes assist with the process of [[bioleaching]], which involves microbes assisting in metal extraction from mining waste that typically extraction methods cannot remove.<ref name=":13">{{Citation |last=Kelly |first=Donovan P. |title=The Family Acidithiobacillaceae |date=2014 |work=The Prokaryotes: Gammaproteobacteria |pages=15–25 |editor-last=Rosenberg |editor-first=Eugene |url=https://doi.org/10.1007/978-3-642-38922-1_250 |access-date=2024-04-18 |place=Berlin, Heidelberg |publisher=Springer |language=en |doi=10.1007/978-3-642-38922-1_250#sec9 |isbn=978-3-642-38922-1 |last2=Wood |first2=Ann P. |editor2-last=DeLong |editor2-first=Edward F. |editor3-last=Lory |editor3-first=Stephen |editor4-last=Stackebrandt |editor4-first=Erko}}</ref>


Some [[Alphaproteobacteria]] can grow at very low levels of nutrients and have unusual morphology within their life cycles. Some form stalks to help with colonization, and form buds during cell division. Others include agriculturally important bacteria capable of inducing nitrogen fixation in symbiosis with plants. The type order is the [[Caulobacterales]], comprising stalk-forming bacteria such as ''[[Caulobacter]]''.<ref name=":11">{{Citation |last=Bandopadhyay |first=Sreejata |title=Soil bacteria and archaea |date=2024 |work=Soil Microbiology, Ecology and Biochemistry |pages=41–74 |url=https://doi.org/10.1016/B978-0-12-822941-5.00003-X |access-date=2024-04-18 |publisher=Elsevier |doi=10.1016/b978-0-12-822941-5.00003-x |isbn=978-0-12-822941-5 |last2=Shade |first2=Ashley}}</ref> The [[mitochondria]] of eukaryotes are thought to be descendants of an alphaproteobacterium.<ref>{{cite journal |author1=Roger, A.J. |author2=Muñoz-Gómez, S.A. |author3=Kamikawa, R. |date=2017 |title=The origin and diversification of mitochondria |journal=Current Biology |volume=27 |issue=21 |pages=R1177–R1192 |doi=10.1016/j.cub.2017.09.015 |pmid=29112874 |doi-access=free}}</ref>
Some [[Alphaproteobacteria]] can grow at very low levels of nutrients and have unusual morphology within their life cycles. Some form stalks to help with colonization, and form buds during cell division. Others include agriculturally important bacteria capable of inducing nitrogen fixation in symbiosis with plants. The type order is the [[Caulobacterales]], comprising stalk-forming bacteria such as ''[[Caulobacter]]''.<ref name=":11">{{Citation |last=Bandopadhyay |first=Sreejata |title=Soil bacteria and archaea |date=2024 |work=Soil Microbiology, Ecology and Biochemistry |pages=41–74 |url=https://doi.org/10.1016/B978-0-12-822941-5.00003-X |access-date=2024-04-18 |publisher=Elsevier |doi=10.1016/b978-0-12-822941-5.00003-x |isbn=978-0-12-822941-5 |last2=Shade |first2=Ashley}}</ref> The [[mitochondria]] of eukaryotes are thought to be descendants of an alphaproteobacterium.<ref>{{cite journal |author1=Roger, A.J. |author2=Muñoz-Gómez, S.A. |author3=Kamikawa, R. |date=2017 |title=The origin and diversification of mitochondria |journal=Current Biology |volume=27 |issue=21 |pages=R1177–R1192 |doi=10.1016/j.cub.2017.09.015 |pmid=29112874 |doi-access=free}}</ref>
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=== Economic Value ===
=== Economic Value ===
Pseudomonadota bacteria are known to have a [[Symbiosis|symbiotic]] or [[Mutualism (biology)|mutualistic]] association with plant roots, specifically the [[Rhizome|rhizomes]] of potato plants.<ref name=":8" /> Because of this symbiotic relationship, farmers can have the ability to increase their crop yields.<ref name=":8" /> Healthier root systems can lead to better nutrient uptake, improved water retention, increased resistance to diseases and pests, and ultimately higher crop yields per acre.<ref>{{Cite journal |last=Hartman |first=Kyle |last2=Schmid |first2=Marc W. |last3=Bodenhausen |first3=Natacha |last4=Bender |first4=S. Franz |last5=Valzano-Held |first5=Alain Y. |last6=Schlaeppi |first6=Klaus |last7=van der Heijden |first7=Marcel G.A. |date=2023-07-31 |title=A symbiotic footprint in the plant root microbiome |url=https://doi.org/10.1186/s40793-023-00521-w |journal=Environmental Microbiome |volume=18 |issue=1 |pages=65 |doi=10.1186/s40793-023-00521-w |issn=2524-6372 |pmc=PMC10391997 |pmid=37525294}}</ref> Increased agricultural output can spark economic growth, contribute to food security, and lead to job creation in rural areas.<ref>{{Cite journal |date=2012 |editor-last=Mozumdar |editor-first=Lavlu |title=Agricultural productivity and food security in the developing world |url=https://ageconsearch.umn.edu/record/196764/?v=pdf |journal=Bangladesh Journal of Agricultural Economics |series=Volume 35 |doi=10.22004/ag.econ.196764}}</ref>
Pseudomonadota bacteria are known to have a [[Symbiosis|symbiotic]] or [[Mutualism (biology)|mutualistic]] association with plant roots, specifically the [[Rhizome|rhizomes]] of potato plants.<ref name=":8" /> Because of this symbiotic relationship, farmers can have the ability to increase their crop yields.<ref name=":8" /> Healthier root systems can lead to better nutrient uptake, improved water retention, increased resistance to diseases and pests, and ultimately higher crop yields per acre.<ref>{{Cite journal |last=Hartman |first=Kyle |last2=Schmid |first2=Marc W. |last3=Bodenhausen |first3=Natacha |last4=Bender |first4=S. Franz |last5=Valzano-Held |first5=Alain Y. |last6=Schlaeppi |first6=Klaus |last7=van der Heijden |first7=Marcel G.A. |date=2023-07-31 |title=A symbiotic footprint in the plant root microbiome |url=https://doi.org/10.1186/s40793-023-00521-w |journal=Environmental Microbiome |volume=18 |issue=1 |pages=65 |doi=10.1186/s40793-023-00521-w |issn=2524-6372 |pmc=PMC10391997 |pmid=37525294}}</ref> Increased agricultural output can spark economic growth, contribute to food security, and lead to job creation in rural areas.<ref>{{Cite journal |date=2012 |editor-last=Mozumdar |editor-first=Lavlu |title=Agricultural productivity and food security in the developing world |url=https://ageconsearch.umn.edu/record/196764/?v=pdf |journal=Bangladesh Journal of Agricultural Economics |series=Volume 35 |doi=10.22004/ag.econ.196764}}</ref>

As briefly mentioned in previous sections, members of ''Pseudomonadota'' have vast metabolic abilities that allow them to utilize and produce a variety of compounds. [[Bioleaching]], done by various ''Thiobacillus'' species, are a primary example of this.<ref>{{Cite web |url=https://academic.oup.com/femsre/article/20/3-4/591/517205 |access-date=2024-04-18 |website=academic.oup.com}}</ref> Any iron and sulfur oxidizing species has the potential to uncover metals and low-grade ores that conventional mining techniques were unable to extract. At present, they are most often used for recovering copper and uranium, but researchers are looking to expand this field in the future. The downside of this method is that the bacteria produce acidic byproducts that end up in [[acid mine drainage]]. Bioleaching has significant economic promise if it can be controlled and not cause any further harm to the environment.<ref name=":13" />


=== Ecological Impact ===
=== Ecological Impact ===

Latest revision as of 19:14, 18 April 2024

Lead[edit]

Pseudomonadota (synonym Proteobacteria) is a major phylum of Gram-negative bacteria.[1] At present, they are considered the predominant phylum within the realm of bacteria.[2] They are naturally found as pathogenic and free-living (non-parasitic) genera.[2] The phylum comprises six classes Acidithiobacilia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria.[3] The Pseudomonadota are widely diverse, with differences in morphology, metabolic processes, relevance to humans, and ecological influence.[2]

Classification[edit]

American microbiologist Carl Woese established this grouping in 1987, informally naming it the "purple bacteria and their relatives". The group was later formally named the 'Proteobacteria' after the Greek god Proteus, who was known to assume many forms.[4] In 2021 the International Committee on Systematics of Prokaryotes designated the synonym Pseudomonadota, and renamed many other prokaryotic phyla as well. This renaming of several phyla remains controversial among microbiologists. Many continue to use the earlier name Proteobacteria, of long standing in the literature. The phylum Pseudomonadota encompasses classes Acidithiobacilia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria.[3] The phylum includes a wide variety of pathogenic genera, such as Escherichia, Salmonella, Vibrio, Yersinia, Legionella, and many others. Others are free-living (non-parasitic) and include many of the bacteria responsible for nitrogen fixation.

Previously, the Pseudomonadota phylum included two additional classes, namely Deltaproteobacteria and Oligoflexia. However, further investigation into the phylogeny of these taxa through genomic marker analysis demonstrated their separation from the Pseudomonadota phylum.[5] Deltaproteobacteria has been identified as a diverse taxonomic unit, leading to a proposal for its reclassification into distinct phyla: Desulfobacterota (encompassing Thermodesulfobacteria), Myxococcota, and Bdellovibrionota (comprising Oligoflexia).[5] The proposed reclassification of the name Epsilonprotobacteria is Campylobacterota.[5]

Taxonomy[edit]

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LSPN) and the National Center for Biotechnology Information (NCBI).

The group Pseudomonadota is defined based on ribosomal RNA (rRNA) sequencing, and are divived into several subclasses. These subclasses were regarded as such for many years, but are now treated as various classes of the phylum. These classes are monophyletic. The genus Acidithiobacillus, part of the Gammaproteobacteria until it was transferred to class Acidithiobacillia in 2013, was previously regarded as paraphyletic to the Betaproteobacteria according to multigenome alignment studies. In 2017, the Betaproteobacteria was subject to major revisions and the class Hydrogenophilalia was created to contain the order Hydrogenophilales

Characteristics[edit]

Pseudomonadota are a diverse group. Though some species may stain Gram-positive or Gram-variable in the labortary, they are nominally Gram-negative. Their unique outer membrane is mainly composed of lipopolysaccharides, which helps differentiate them from the Gram-positive species[6]. Most Pseudomonadota are motile and move using flagella. Many move about using flagella, but some are nonmotile, or rely on bacterial gliding.[2]

Pseudomonadota have a wide variety of metabolism types. Most are facultative or obligate anaerobes, chemolithoautotrophs, and heterotrophs, though numerous exceptions exist. A variety of distantly related genera within the Pseudomonadota, obtain their energy from light through conventional photosynthesis or anoxygenic photosynthesis.[2]

The Acidithiobacillia contain only sulfur, iron, and uranium-oxidizing autotrophs. The type order is the Acidithiobacillaceae, which includes five different Acidthiobacillus species used in the mining industry. In particular, these microbes assist with the process of bioleaching, which involves microbes assisting in metal extraction from mining waste that typically extraction methods cannot remove.[7]

Some Alphaproteobacteria can grow at very low levels of nutrients and have unusual morphology within their life cycles. Some form stalks to help with colonization, and form buds during cell division. Others include agriculturally important bacteria capable of inducing nitrogen fixation in symbiosis with plants. The type order is the Caulobacterales, comprising stalk-forming bacteria such as Caulobacter.[8] The mitochondria of eukaryotes are thought to be descendants of an alphaproteobacterium.[9]

The Betaproteobacteria are highly metabolically diverse and contain chemolithoautotrophs, photoautotrophs, and generalist heterotrophs. The type order is the Burkholderiales, comprising an enormous range of metabolic diversity, including opportunistic pathogens. These pathogens are primary for both humans and animals, such as the horse pathogen Burkholderia mallei, and Burkholderia cepacia which causes reparatory tract infections in people with cystic fibrosis.[10]

The Gammaproteobacteria are one of the largest classes in terms of genera, containing approximately 250 validly published names[11]. The type order is the Pseudomonadales, which include the genera Pseudomonas and the nitrogen-fixing Azotobacter, along with many others. Besides being a well-known pathogenic genera, Pseudomonas is also capable of biodegradation of certain materials, like cellulose.[8]

The Hydrogenophilalia are thermophilic chemoheterotrophs and autotrophs[12]. The bacteria typically use hydrogen gas as an electron donor, but can also use reduced sulfuric compounds. Because of this ability, scientists have begun to use certain species of Hydrogenophilalia to remove sulfides that contaminate industrial wastewater systems.[13] The type order is the Hydrogenophilaceae which contains the genera Thiobacillus, Petrobacter, Sulfuricella, Hydrogenophilus and Tepidiphilus. Currently, no members of this class have been identified as pathogenic.[13]

The Zetaproteobacteria are the iron-oxidizing neutrophilic chemolithoautotrophs, distributed worldwide in estuaries and marine habitats.[2] This group is so successful in its environment due to to their microaerophilic nature. Because they require less oxygen than what is present in the atmosphere, they are able to compete with the abiotic iron(II) oxidation that is already occurring in the environment.[14] The only confirmed type order for this class is the Mariprofundaceae, which does not contain any known pathogenic species.[15]

Habitat[edit]

Due to the distinctive nature of each of the six classes of Pseudomonadota, this phylum occupies a multitude of habitats. These include:

  • Human oral cavity[16]
  • Microbial mats in the deep sea[17]
  • Marine sediments[18]
  • Thermal sulfur springs[19]
  • Agricultural soil[19]
  • Hydrothermal vents[20]
  • Stem nodules of legumes[21]
  • Within aphids as endosymbionts[21]
  • Gastrointestinal tract of warm-blooded species[21]
  • Brackish, estuary waters[21]
  • Microbiomes of shrimp and mollusks[21]
  • Human vaginal tract[1]
  • Potato rhizosphere microbiome[22]

Significance[edit]

Human Health[edit]

Studies have suggested Pseudomonadota as a relevant signature of disease in the human gastrointestinal (GI) tract, by operating as a marker for microbiota instability.[1] The human gut microbiome consists mainly of four phyla: Firmicutes, Bacteroidetes, Actinobacteria, and Pseudomonadota.[1] Microorganism gut colonization is dynamic from birth to death, with stabilization at the first few years of life, to higher diversity in adults, to reduced diversity in the elderly.[1] The gut microbiome conducts processes like nutrient synthesis, chemical metabolism, and the formation of the gut barrier.[1] Additionally, the gut microbiome facilitates host interactions with its surrounding environment through regulation of nutrient absorption and bacterial intake. In 16s rRNA and metagenome sequencing studies, Proteobacteria have been identified as bacteria that prompts endotoxemia (an inflammatory gut response) and metabolic disorders in human GI tracts.[1] An example in Lambeth et al. found increased bacterial count in patients with type 2 diabetes (T2DM) in comparison to patients with pre-diabetes or other control groups.[23] Another study by Michail et al. showed a correlation of microbial composition in children with and without nonalcoholic fatty liver disease (NAFLD), wherein patients with NAFLD having a higher abundance of Gammproteobacteria than patients without the disease.[24]

Classes Betaproteobacteria and Gammaproteobacteria are prevalent within the human oral cavity, and are markers for good oral health.[16] The oral microbiome consists of 11 habitats, including the tongue dorsum, hard palate, tonsils, throat, saliva, and more.[25] Changes in the oral microbiome are due to endogenous and exogenous factors like host lifestyle, genotype, environment, immune system, and socioeconomic status.[25] Considering diet as a factor, high saturated fatty acid (SAF) content, achieved through poor diet, has been correlated to increased abundance of Betaproteobacteria in the oral cavity.[25]

Economic Value[edit]

Pseudomonadota bacteria are known to have a symbiotic or mutualistic association with plant roots, specifically the rhizomes of potato plants.[22] Because of this symbiotic relationship, farmers can have the ability to increase their crop yields.[22] Healthier root systems can lead to better nutrient uptake, improved water retention, increased resistance to diseases and pests, and ultimately higher crop yields per acre.[26] Increased agricultural output can spark economic growth, contribute to food security, and lead to job creation in rural areas.[27]

As briefly mentioned in previous sections, members of Pseudomonadota have vast metabolic abilities that allow them to utilize and produce a variety of compounds. Bioleaching, done by various Thiobacillus species, are a primary example of this.[28] Any iron and sulfur oxidizing species has the potential to uncover metals and low-grade ores that conventional mining techniques were unable to extract. At present, they are most often used for recovering copper and uranium, but researchers are looking to expand this field in the future. The downside of this method is that the bacteria produce acidic byproducts that end up in acid mine drainage. Bioleaching has significant economic promise if it can be controlled and not cause any further harm to the environment.[7]

Ecological Impact[edit]

Pseudomonadota are microbes commonly found within soil systems.[22] Microbes play a crucial role in the surrounding ecosystem by performing functions such as nutrient cycling, carbon dioxide fixation, decomposition, and nitrogen fixation.[29] Pseudomonadota can be described as phototrophs, heterotrophs, and lithotrophs. As heterotrophs (examples Pseudomonas and Xanthomonas) these bacteria are effective in breaking down organic matter, contributing to nutrient cycling.[29] Additionally, photolithotrophs within the phylum are able to perform photosynthesis using sulfide or elemental sulfur as electron donors, which enables them to participate in carbon fixation and oxygen production even in anaerobic conditions.[29] These Pseudomonadota bacteria are also considered copiotrophic organisms, meaning they can be found in environments with high nutrient availability.[29] These environments have ample sources of carbon and other nutrients, environments like fertile soils, compost, and sewage. These copiotrophic bacteria are able to enhance soil health by performing nutrient cycling and waste decomposition.

Because this phylum are able to form a symbiotic relationship with plant roots, incorporating Pseudomonadota into agricultural practices aligns with principles of sustainable farming.[30][22] These bacteria contribute to soil health and fertility, promote natural pest management, and enhance the resilience of crops to environmental stressors.[30]

References[edit]

  1. ^ a b c d e f g Rizzatti, G.; Lopetuso, L. R.; Gibiino, G.; Binda, C.; Gasbarrini, A. (2017). "Proteobacteria: A Common Factor in Human Diseases". BioMed Research International. 2017: 1–7. doi:10.1155/2017/9351507. ISSN 2314-6133. PMC 5688358. PMID 29230419.{{cite journal}}: CS1 maint: PMC format (link) CS1 maint: unflagged free DOI (link)
  2. ^ a b c d e f "Pseudomonadota Garrity et al., 2021". www.gbif.org. Retrieved 2024-04-11.
  3. ^ a b Kersters, Karel; De Vos, Paul; Gillis, Monique; Swings, Jean; Vandamme, Peter; Stackebrandt, Erko (2006), Dworkin, Martin; Falkow, Stanley; Rosenberg, Eugene; Schleifer, Karl-Heinz (eds.), "Introduction to the Proteobacteria", The Prokaryotes: Volume 5: Proteobacteria: Alpha and Beta Subclasses, New York, NY: Springer, pp. 3–37, doi:10.1007/0-387-30745-1_1, ISBN 978-0-387-30745-9, retrieved 2024-04-07
  4. ^ Moon, Christina D.; Young, Wayne; Maclean, Paul H.; Cookson, Adrian L.; Bermingham, Emma N. (2018-10). "Metagenomic insights into the roles of Proteobacteria in the gastrointestinal microbiomes of healthy dogs and cats". MicrobiologyOpen. 7 (5). doi:10.1002/mbo3.677. ISSN 2045-8827. PMC 6182564. PMID 29911322. {{cite journal}}: Check date values in: |date= (help)CS1 maint: PMC format (link)
  5. ^ a b c Waite, David W; Chuvochina, Maria; Pelikan, Claus; Parks, Donovan H; Yilmaz, Pelin; Wagner, Michael; Loy, Alexander; Naganuma, Takeshi; Nakai, Ryosuke; Whitman, William B; Hahn, Martin W; Kuever, Jan; Hugenholtz, Philip (2020). "Proposal to reclassify the proteobacterial classes Deltaproteobacteria and Oligoflexia, and the phylum Thermodesulfobacteria into four phyla reflecting major functional capabilities". International Journal of Systematic and Evolutionary Microbiology. 70 (11): 5972–6016. doi:10.1099/ijsem.0.004213. ISSN 1466-5034.
  6. ^ Silhavy, Thomas J.; Kahne, Daniel; Walker, Suzanne (2010-05-01). "The Bacterial Cell Envelope". Cold Spring Harbor Perspectives in Biology. 2 (5): a000414. doi:10.1101/cshperspect.a000414. ISSN 1943-0264. PMC 2857177. PMID 20452953.{{cite journal}}: CS1 maint: PMC format (link)
  7. ^ a b Kelly, Donovan P.; Wood, Ann P. (2014), Rosenberg, Eugene; DeLong, Edward F.; Lory, Stephen; Stackebrandt, Erko (eds.), "The Family Acidithiobacillaceae", The Prokaryotes: Gammaproteobacteria, Berlin, Heidelberg: Springer, pp. 15–25, doi:10.1007/978-3-642-38922-1_250#sec9, ISBN 978-3-642-38922-1, retrieved 2024-04-18
  8. ^ a b Bandopadhyay, Sreejata; Shade, Ashley (2024), "Soil bacteria and archaea", Soil Microbiology, Ecology and Biochemistry, Elsevier, pp. 41–74, doi:10.1016/b978-0-12-822941-5.00003-x, ISBN 978-0-12-822941-5, retrieved 2024-04-18
  9. ^ Roger, A.J.; Muñoz-Gómez, S.A.; Kamikawa, R. (2017). "The origin and diversification of mitochondria". Current Biology. 27 (21): R1177–R1192. doi:10.1016/j.cub.2017.09.015. PMID 29112874.
  10. ^ Coenye, Tom (2014), Rosenberg, Eugene; DeLong, Edward F.; Lory, Stephen; Stackebrandt, Erko (eds.), "The Family Burkholderiaceae", The Prokaryotes: Alphaproteobacteria and Betaproteobacteria, Berlin, Heidelberg: Springer, pp. 759–776, doi:10.1007/978-3-642-30197-1_239, ISBN 978-3-642-30197-1, retrieved 2024-04-18
  11. ^ Williams, Kelly P.; Gillespie, Joseph J.; Sobral, Bruno W. S.; Nordberg, Eric K.; Snyder, Eric E.; Shallom, Joshua M.; Dickerman, Allan W. (2010-05). "Phylogeny of Gammaproteobacteria". Journal of Bacteriology. 192 (9): 2305–2314. doi:10.1128/JB.01480-09. ISSN 0021-9193. PMC 2863478. PMID 20207755. {{cite journal}}: Check date values in: |date= (help)CS1 maint: PMC format (link)
  12. ^ Wakai, Satoshi; Masanari, Misa; Ikeda, Takumi; Yamaguchi, Naho; Ueshima, Saori; Watanabe, Kaori; Nishihara, Hirofumi; Sambongi, Yoshihiro (2013-04). "Oxidative phosphorylation in a thermophilic, facultative chemoautotroph, Hydrogenophilus thermoluteolus, living prevalently in geothermal niches". Environmental Microbiology Reports. 5 (2): 235–242. doi:10.1111/1758-2229.12005. ISSN 1758-2229. PMID 23584967. {{cite journal}}: Check date values in: |date= (help)
  13. ^ a b Orlygsson, Johann; Kristjansson, Jakob K. (2014), Rosenberg, Eugene; DeLong, Edward F.; Lory, Stephen; Stackebrandt, Erko (eds.), "The Family Hydrogenophilaceae", The Prokaryotes: Alphaproteobacteria and Betaproteobacteria, Berlin, Heidelberg: Springer, pp. 859–868, doi:10.1007/978-3-642-30197-1_244, ISBN 978-3-642-30197-1, retrieved 2024-04-18
  14. ^ "The Fe(II)-oxidizing Zetaproteobacteria: historical, ecological and genomic perspectives". academic.oup.com. doi:10.1093/femsec/fiz015. PMC 6443915. PMID 30715272. Retrieved 2024-04-17.{{cite web}}: CS1 maint: PMC format (link)
  15. ^ Moreira, Ana Paula B.; Meirelles, Pedro M.; Thompson, Fabiano (2014), Rosenberg, Eugene; DeLong, Edward F.; Lory, Stephen; Stackebrandt, Erko (eds.), "The Family Mariprofundaceae", The Prokaryotes: Deltaproteobacteria and Epsilonproteobacteria, Berlin, Heidelberg: Springer, pp. 403–413, doi:10.1007/978-3-642-39044-9_378#sec2, ISBN 978-3-642-39044-9, retrieved 2024-04-18
  16. ^ a b Leão, Inês; de Carvalho, Teresa Bento; Henriques, Valentina; Ferreira, Catarina; Sampaio-Maia, Benedita; Manaia, Célia M. (2023-02-01). "Pseudomonadota in the oral cavity: a glimpse into the environment-human nexus". Applied Microbiology and Biotechnology. 107 (2): 517–534. doi:10.1007/s00253-022-12333-y. ISSN 1432-0614. PMC 9842593. PMID 36567346.{{cite journal}}: CS1 maint: PMC format (link)
  17. ^ Williams, Kelly P.; Kelly, Donovan P. (2013). "Proposal for a new class within the phylum Proteobacteria, Acidithiobacillia classis nov., with the type order Acidithiobacillales, and emended description of the class Gammaproteobacteria". International Journal of Systematic and Evolutionary Microbiology. 63 (Pt_8): 2901–2906. doi:10.1099/ijs.0.049270-0. ISSN 1466-5034.
  18. ^ Gray, J P; Herwig, R P (1996-11). "Phylogenetic analysis of the bacterial communities in marine sediments". Applied and Environmental Microbiology. 62 (11): 4049–4059. doi:10.1128/aem.62.11.4049-4059.1996. ISSN 0099-2240. PMC 168226. PMID 8899989. {{cite journal}}: Check date values in: |date= (help)CS1 maint: PMC format (link)
  19. ^ a b Boden, Rich; Hutt, Lee P; Rae, Alex W (2017). "Reclassification of Thiobacillus aquaesulis (Wood & Kelly, 1995) as Annwoodia aquaesulis gen. nov., comb. nov., transfer of Thiobacillus (Beijerinck, 1904) from the Hydrogenophilales to the Nitrosomonadales, proposal of Hydrogenophilalia class. nov. within the 'Proteobacteria', and four new families within the orders Nitrosomonadales and Rhodocyclales". International Journal of Systematic and Evolutionary Microbiology. 67 (5): 1191–1205. doi:10.1099/ijsem.0.001927. ISSN 1466-5034.
  20. ^ Emerson, David; Rentz, Jeremy A.; Lilburn, Timothy G.; Davis, Richard E.; Aldrich, Henry; Chan, Clara; Moyer, Craig L. (2007-08-01). "A Novel Lineage of Proteobacteria Involved in Formation of Marine Fe-Oxidizing Microbial Mat Communities". PLOS ONE. 2 (8): e667. doi:10.1371/journal.pone.0000667. ISSN 1932-6203. PMC 1930151. PMID 17668050.{{cite journal}}: CS1 maint: PMC format (link) CS1 maint: unflagged free DOI (link)
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