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Pseudomonadota
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<h2 id="classification">Classification</h2> <p>American microbiologist <a href="/facts/Carl_Woese/uzzVL0LR">Carl Woese</a> established this grouping in 1987, calling it informally the "purple bacteria and their relatives".<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> The group was later formally named the 'Proteobacteria' after the Greek god Proteus, who was known to assume many forms.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> In 2021 the <a href="/facts/International_Committee_on_Systematics_of_Prokaryotes/nXJej75I">International Committee on Systematics of Prokaryotes</a> designated the synonym Pseudomonadota, and renamed many other prokaryotic phyla as well.<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> This renaming of several <a href="/facts/Prokaryote/oYyvaDDH">prokaryote</a> phyla in 2021, including Pseudomonadota, remains controversial among microbiologists, many of whom continue to use the earlier name Proteobacteria, of long standing in the literature.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> The phylum Pseudomonadota encompasses classes <i>Acidithiobacillia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia</i>, and <i>Zetaproteobacteria.</i><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> The phylum includes a wide variety of <a href="/facts/Pathogen/axMXtV1M">pathogenic</a> genera, such as <i><a href="/facts/Escherichia/ehBXfPgT">Escherichia</a></i>, <i><a href="/facts/Salmonella/2SkCRybG">Salmonella</a></i>, <i><a href="/facts/Vibrio/Lkef6ynj">Vibrio</a></i>, <i><a href="/facts/Yersinia/R8QWAIcR">Yersinia</a></i>, <i><a href="/facts/Legionella/98PA98kj">Legionella</a></i>, and many others.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> Others are free-living (non-<a href="/facts/Parasitism/HWPcgky7">parasitic</a>) and include many of the <a href="/facts/Bacteria/wC8xSCsU">bacteria</a> responsible for <a href="/facts/Nitrogen_fixation/TeLoBpWS">nitrogen fixation</a>.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> </p><p>Previously, the Pseudomonadota phylum included two additional classes, namely <i>Deltaproteobacteria</i> and <i><a href="/facts/Oligoflexia/Q6mJE6PU">Oligoflexia</a></i>. However, further investigation into the phylogeny of these taxa through genomic marker analysis demonstrated their separation from the Pseudomonadota phylum.<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> <i>Deltaproteobacteria</i> has been identified as a diverse <a href="/facts/Taxonomy/QRvFI267">taxonomic</a> unit, leading to a proposal for its reclassification into distinct phyla: <i><a href="/facts/Desulfobacterota/A1H4tz0F">Desulfobacterota</a></i> (encompassing <i><a href="/facts/Thermodesulfobacteriota/A1H4tz0F">Thermodesulfobacteria</a></i>), <i><a href="/facts/Myxococcota/zqFLbrNx">Myxococcota</a></i>, and <i><a href="/facts/Bdellovibrionota/tDIFcm9C">Bdellovibrionota</a></i> (comprising <i>Oligoflexia</i>).<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p><p>The class <i><a href="/facts/Epsilonproteobacteria/Vxa6HGy5">Epsilonproteobacteria</a></i> was additionally identified within the Pseudomonadota phylum. This class is characterized by its significance as <a href="/facts/Chemolithotrophic/1CboHMzX">chemolithotrophic</a> primary producers and its metabolic prowess in deep-sea <a href="/facts/Hydrothermal_vent/0xPqNUkY">hydrothermal vent</a> ecosystems.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> Noteworthy pathogenic genera within this class include <i><a href="/facts/Campylobacter/lFSkgKUp">Campylobacter</a>, <a href="/facts/Helicobacter/EYzbnhTU">Helicobacter</a>, and <a href="/facts/Arcobacter/yJ2huus0">Arcobacter</a></i>. Analysis of phylogenetic tree topology and genetic markers revealed the direct divergence of <i>Epsilonproteobacteria</i> from the Pseudomonadota phylum.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> Limited <a href="/facts/Outgroup_(cladistics)/XnAuxXsV">outgroup</a> data and low bootstrap values support these discoveries. Despite further investigations, consensus has not been reached regarding the <a href="/facts/Monophyly/pD8Yrrn6">monophyletic</a> nature of <i>Epsilonproteobacteria</i> within Proteobacteria, prompting researchers to propose its taxonomic separation from the phylum. The proposed reclassification of the name <i>Epsilonproteobacteria</i> is <i>Epsilonbacteraeota</i>,<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> later revised to <i><a href="/facts/Campylobacterota/tXKmFDSc">Campylobacterota</a></i> in 2018.<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p> <h2 id="taxonomy">Taxonomy</h2> <p>The currently accepted taxonomy is based on the <a href="/facts/List_of_Prokaryotic_names_with_Standing_in_Nomenclature/9djL152L">List of Prokaryotic names with Standing in Nomenclature</a> (LPSN)<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> and <a href="/facts/National_Center_for_Biotechnology_Information/6Xj5wCbu">National Center for Biotechnology Information</a> (NCBI).<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> </p><p>The group Pseudomonadota is defined based on <a href="/facts/Ribosomal_RNA/zy5FxddY">ribosomal RNA</a> (rRNA) sequencing, and are divided 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 <a href="/facts/Monophyly/pD8Yrrn6">monophyletic</a>.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a><a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> The genus <i><a href="/facts/Acidithiobacillus/VaTzyuzg">Acidithiobacillus</a></i>, part of the Gammaproteobacteria until it was transferred to class Acidithiobacillia in 2013,<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> was previously regarded as <a href="/facts/Paraphyly/tmTWjACz">paraphyletic</a> to the <i>Betaproteobacteria</i> according to <a href="/facts/Phylogenomics/MsclFvpS">multigenome alignment studies</a>.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> In 2017, the <a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a> was subject to major revisions and the class <a href="/facts/Hydrogenophilalia/jffpg1ID">Hydrogenophilalia</a> was created to contain the order <a href="/facts/Hydrogenophilales/UQJKMHLK">Hydrogenophilales</a><a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p><p>Pseudomonadota classes with validly published names include some prominent genera:<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> e.g.: </p> <ul><li><a href="/facts/Acidithiobacillia/cTmegKyg">Acidithiobacillia</a>: <i><a href="/facts/Acidithiobacillus_thiooxidans/xbS3WPnA">Acidithiobacillus</a></i>, <i><a href="/facts/Thermithiobacillus_tepidarius/yBqm9H8R">Thermithiobacillus</a></i></li> <li><a href="/facts/Alphaproteobacteria/92fz61Lz">Alphaproteobacteria</a>: <i><a href="/facts/Brucella/erCr0WsS">Brucella</a>, <a href="/facts/Rhizobium/sWumxgnX">Rhizobium</a>, <a href="/facts/Agrobacterium/eu45qB2S">Agrobacterium</a>, <a href="/facts/Caulobacter/LVsPSFM8">Caulobacter</a>, <a href="/facts/Rickettsia/87baaTxT">Rickettsia</a>, <a href="/facts/Wolbachia/trqJvTHu">Wolbachia</a></i>, etc.</li> <li><a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a>: <i><a href="/facts/Bordetella/RuNYJpos">Bordetella</a>, <a href="/facts/Ralstonia/lCPT1zEx">Ralstonia</a>, <a href="/facts/Neisseria/cpbpHsNx">Neisseria</a>, <a href="/facts/Nitrosomonas/2XnhapIt">Nitrosomonas</a></i>, etc.</li> <li><a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a>: <i><a href="/facts/Escherichia/ehBXfPgT">Escherichia</a>, <a href="/facts/Shigella/xKEXoT4w">Shigella</a>, <a href="/facts/Salmonella/2SkCRybG">Salmonella</a>, <a href="/facts/Yersinia/R8QWAIcR">Yersinia</a>, <a href="/facts/Buchnera_(bacterium)/PKlSLpJ7">Buchnera</a>, <a href="/facts/Haemophilus/uKcnj55j">Haemophilus</a>, <a href="/facts/Vibrio/Lkef6ynj">Vibrio</a>, <a href="/facts/Pseudomonas/FKEX7p7K">Pseudomonas</a></i>, <a href="/facts/Pasteurella/tQ9fCtEV">Pasteurella</a><i>, etc.</i></li> <li><a href="/facts/Zetaproteobacteria/aWGJ00K2">Zetaproteobacteria</a>: <i><a href="/facts/Mariprofundus_ferrooxydans/3dELmrnS">Mariprofundus</a></i></li></ul> <table><tbody><tr><th colspan="1">according to iTOL, Bergey's and others.</th><th colspan="1">16S rRNA based <a href="/facts/The_All-Species_Living_Tree_Project/txMadzJv">LTP</a>_10_2024<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a><a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></th><th colspan="1">120 marker proteins based <a href="/facts/Genome_Taxonomy_Database/hnEgBvVx">GTDB</a> 09-RS220<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a><a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a></th></tr><tr><td><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Alphaproteobacteria/92fz61Lz">Alphaproteobacteria</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Zetaproteobacteria/aWGJ00K2">Zetaproteobacteria</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p><a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p><a href="/facts/Hydrogenophilalia/jffpg1ID">Hydrogenophilalia</a></p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td><td><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>other</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>other</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td>"Caulobacterota"</td><td rowspan="2"><p>"<a href="/facts/Caulobacteria/92fz61Lz">Caulobacteria</a>" (<a href="/facts/Alphaproteobacteria/92fz61Lz">Alphaproteobacteria</a>)</p></td></tr><tr><td>("Alphaproteobacteriota")</td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>other</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td>"Chromatibacteria"</td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>Thiohalorhabdales</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Magnetococcales/fBW2x63J">Magnetococcia</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p>"<a href="/facts/Mariprofundales/3dELmrnS">Mariprofundia</a>" (<a href="/facts/Zetaproteobacteria/aWGJ00K2">Zetaproteobacteria</a>)</p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>Methylohalomonadales</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>Thiohalomonadales</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>Thiomicrospirales</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Hydrogenophilalia/jffpg1ID">Hydrogenophilalia</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p><a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a></p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p>"Pseudomonadia" (<a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a> and nested <a href="/facts/Acidithiobacillia/cTmegKyg">Acidithiobacillia</a>)</p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td><td><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><table><tbody><tr><td>"<a href="/facts/Caulobacteria/92fz61Lz">Caulobacteria</a>"</td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>Clade 1</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>"Rickettsiidae"</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p>"Caulobacteridae"</p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td>(<a href="/facts/Alphaproteobacteria/92fz61Lz">Alphaproteobacteria</a>)</td></tr></tbody></table></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>"<a href="/facts/Mariprofundales/3dELmrnS">Mariprofundia</a>" (<a href="/facts/Zetaproteobacteria/aWGJ00K2">Zetaproteobacteria</a>)</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p><a href="/facts/Magnetococcales/fBW2x63J">Magnetococcia</a></p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><table><tbody><tr><td>"Pseudomonadia"</td><td rowspan="2"><table><tbody><tr><td></td><td rowspan="2"><p>"Neisseriidae" (<a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a> & nested <a href="/facts/Hydrogenophilalia/jffpg1ID">Hydrogenophilalia</a>)</p></td></tr><tr><td></td></tr><tr><td></td><td rowspan="2"><p>"Pseudomonadidae" (<a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a> & nested <a href="/facts/Acidithiobacillia/cTmegKyg">Acidithiobacillia</a>)</p></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr><tr><td></td></tr></tbody></table></td></tr></tbody></table> <h2 id="characteristics">Characteristics</h2> <p>Pseudomonadota are a diverse group. Though some species may stain Gram-positive or Gram-variable in the laboratory, they are nominally <a href="/facts/Gram-negative/S1PbVtp4">Gram-negative</a>. Their unique <a href="/facts/Bacterial_outer_membrane/75HPUFEV">outer membrane</a> is mainly composed of <a href="/facts/Lipopolysaccharide/Ch967TXw">lipopolysaccharides</a>, which helps differentiate them from the Gram-positive species.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> Most Pseudomonadota are motile and move using flagella. Many move about using <a href="/facts/Flagellum/nvQRcbgJ">flagella</a>, but some are nonmotile, or rely on <a href="/facts/Bacterial_gliding/eHIMoP6f">bacterial gliding</a>.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> </p><p>Pseudomonadota have a wide variety of <a href="/facts/Metabolism/WxDrm8k5">metabolism</a> types. Most are facultative or obligate <a href="/facts/Anaerobic_organism/bhQnlqCq">anaerobes</a>, <a href="/facts/Chemolithoautotrophic/UxUKtfzA">chemolithoautotrophs</a>, and <a href="/facts/Heterotrophic/wtzlgBtz">heterotrophs</a>, though numerous exceptions exist. A variety of distantly related genera within the Pseudomonadota obtain their energy from light through conventional <a href="/facts/Photosynthesis/TMV7w693">photosynthesis</a> or <a href="/facts/Anoxygenic_photosynthesis/vALSo4pU">anoxygenic photosynthesis</a>.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> </p><p>The <a href="/facts/Acidithiobacillia/cTmegKyg">Acidithiobacillia</a> contain only sulfur, iron, and uranium-oxidizing <a href="/facts/Autotroph/UDc8bzqD">autotrophs</a>. The type order is the <a href="/facts/Acidithiobacillales/58o6UJRn">Acidithiobacillaceae</a>, which includes five different <i>Acidithiobacillus</i> species used in the mining industry. In particular, these microbes assist with the process of <a href="/facts/Bioleaching/1FPuznKK">bioleaching</a>, which involves microbes assisting in metal extraction from mining waste that typically extraction methods cannot remove.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> </p><p>Some <a href="/facts/Alphaproteobacteria/92fz61Lz">Alphaproteobacteria</a> 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 <a href="/facts/Caulobacterales/kkKhtHHM">Caulobacterales</a>, comprising stalk-forming bacteria such as <i><a href="/facts/Caulobacter/LVsPSFM8">Caulobacter</a></i>.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> The <a href="/facts/Mitochondria/ErHqrdJ1">mitochondria</a> of eukaryotes are thought to be descendants of an alphaproteobacterium.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a> </p><p>The <a href="/facts/Betaproteobacteria/k6lha8ll">Betaproteobacteria</a> are highly metabolically diverse and contain <a href="/facts/Chemolithoautotroph/UxUKtfzA">chemolithoautotrophs</a>, <a href="/facts/Photoautotroph/I1KGoVhw">photoautotrophs</a>, and generalist <a href="/facts/Heterotroph/wtzlgBtz">heterotrophs</a>. The type order is the <a href="/facts/Burkholderiales/brkbUkk4">Burkholderiales</a>, comprising an enormous range of metabolic diversity, including <a href="/facts/Opportunistic_pathogen/d6ndMynw">opportunistic pathogens</a>. These pathogens are primary for both humans and animals, such as the horse pathogen <i>Burkholderia mallei</i>, and <i>Burkholderia cepacia</i> which causes respiratory tract infections in people with cystic fibrosis.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> </p><p>The <a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a> are one of the largest classes in terms of genera, containing approximately 250 validly published names.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> The type order is the <a href="/facts/Pseudomonadales/LBtFQA8T">Pseudomonadales</a>, which include the genera <i><a href="/facts/Pseudomonas/FKEX7p7K">Pseudomonas</a></i> and the nitrogen-fixing <i><a href="/facts/Azotobacter/sL6e2WTw">Azotobacter</a></i>, along with many others. Besides being a well-known pathogenic genus, <i>Pseudomonas</i> is also capable of biodegradation of certain materials, like cellulose.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> </p><p>The <a href="/facts/Hydrogenophilalia/jffpg1ID">Hydrogenophilalia</a> are thermophilic chemoheterotrophs and autotrophs.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> 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. The type order is the <a href="/facts/Hydrogenophilales/UQJKMHLK">Hydrogenophilaceae</a> which contains the genera <i>Thiobacillus, Petrobacter, Sulfuricella,</i> <i>Hydrogenophilus</i> and <i>Tepidiphilus</i>. Currently, no members of this class have been identified as pathogenic.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> </p><p>The <a href="/facts/Zetaproteobacteria/aWGJ00K2">Zetaproteobacteria</a> are the <a href="/facts/Microbial_metabolism/mnzhpwaK">iron-oxidizing</a> <a href="/facts/Neutrophile/NIJHfQav">neutrophilic</a> <a href="/facts/Chemolithotrophic/1CboHMzX">chemolithoautotrophs</a>, distributed worldwide in estuaries and marine habitats.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> This group is so successful in its environment due 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.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> The only confirmed type order for this class is the <a href="/facts/Mariprofundales/3dELmrnS">Mariprofundaceae</a>, which does not contain any known pathogenic species.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p> <h2 id="transformation">Transformation</h2> <p><a href="/facts/Transformation_(genetics)/n82cCRCu">Transformation</a>, a process in which genetic material passes from one bacterium to another,<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> has been reported in at least 30 species of Pseudomonadota distributed in the classes alpha, beta, and gamma.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> The best-studied Pseudomonadota with respect to natural genetic transformation are the medically important human pathogens <i><a href="/facts/Neisseria_gonorrhoeae/2oq5rccN">Neisseria gonorrhoeae</a></i> (class beta), and <i><a href="/facts/Haemophilus_influenzae/wqIpoDI1">Haemophilus influenzae</a></i> (class gamma).<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> Natural genetic transformation is a sexual process involving DNA transfer from one bacterial cell to another through the intervening medium and the integration of the donor sequence into the recipient genome. In pathogenic Pseudomonadota, transformation appears to serve as a <a href="/facts/DNA_repair/hsURuYYq">DNA repair</a> process that protects the pathogen's DNA from attack by their host's phagocytic defenses that employ <a href="/facts/Reactive_oxygen_species/GpwSRugH">oxidative free radicals</a>.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> </p> <h2 id="habitat">Habitat</h2> <p>Due to the distinctive nature of each of the six classes of Pseudomonadota, this phylum occupies a multitude of habitats. These include: </p> <ul><li>Human oral cavity<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a></li> <li>Microbial mats in the deep sea<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a></li> <li>Marine sediments<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a></li> <li>Thermal sulfur springs<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a></li> <li>Agricultural soil<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a></li> <li>Hydrothermal vents<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a></li> <li>Stem nodules of legumes<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a></li> <li>Within aphids as endosymbionts<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a></li> <li>Gastrointestinal tract of warm-blooded species<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a></li> <li>Brackish, estuary waters<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a></li> <li>Microbiomes of shrimp and mollusks<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a></li> <li>Human vaginal tract<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a></li> <li>Potato rhizosphere microbiome<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a></li></ul> <h2 id="significance">Significance</h2> <h3>Human health</h3> <p>Studies have suggested Pseudomonadota as a relevant signature of disease in the human <a href="/facts/Gastrointestinal_tract/nK2zwqBS">gastrointestinal</a> (GI) tract, by operating as a marker for microbiota instability.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> The human gut <a href="/facts/Microbiome/lVjQnvpm">microbiome</a> consists mainly of four phyla: <a href="/facts/Firmicutes/Ic9CrSe7">Firmicutes</a>, <a href="/facts/Bacteroidetes/EA9L6clb">Bacteroidetes</a>, <a href="/facts/Actinobacteria/vBImrRr7">Actinobacteria</a>, and Pseudomonadota.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> 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.<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> The gut microbiome conducts processes like nutrient synthesis, chemical <a href="/facts/Metabolism/WxDrm8k5">metabolism</a>, and the formation of the gut barrier.<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> Additionally, the gut microbiome facilitates host interactions with its surrounding environment through regulation of nutrient absorption and bacterial intake. In 16s rRNA and <a href="/facts/Metagenomics/GWFeMd7z">metagenome</a> sequencing studies, Proteobacteria have been identified as bacteria that prompts <a href="/facts/Endotoxemia/Ch967TXw">endotoxemia</a> (an inflammatory gut response) and metabolic disorders in human GI tracts.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a> Another study by Michail et al. showed a correlation of microbial composition in children with and without <a href="/facts/Nonalcoholic_fatty_liver_disease/WoAmAUmV">nonalcoholic fatty liver disease</a> (NAFLD), wherein patients with NAFLD have a higher abundance of <a href="/facts/Gammaproteobacteria/2ISNVT8r">Gammaproteobacteria</a> than patients without the disease.<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> </p><p>Classes Betaproteobacteria and Gammaproteobacteria are prevalent within the human oral cavity, and are markers for good oral health.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> The oral microbiome consists of 11 habitats, including the tongue dorsum, <a href="/facts/Hard_palate/UKtwNlup">hard palate</a>, tonsils, throat, saliva, and more.<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a> Changes in the oral microbiome are due to <a href="/facts/Endogeny_(biology)/DFkSLkRI">endogenous</a> and <a href="/facts/Exogeny/yHXbIsAa">exogenous</a> factors like host lifestyle, <a href="/facts/Genotype/MlzK1Mfz">genotype</a>, environment, immune system, and <a href="/facts/Socioeconomic_status/5rVhvE8b">socioeconomic</a> status.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> Considering diet as a factor, high <a href="/facts/Saturated_fatty_acid/8pvw306D">saturated fatty acid</a> (SAF) content, achieved through poor diet, has been correlated to increased abundance of Betaproteobacteria in the oral cavity.<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> </p> <h3>Economic value</h3> <p>Pseudomonadota bacteria have a <a href="/facts/Symbiosis/MrBArRGa">symbiotic</a> or <a href="/facts/Mutualism_(biology)/29hCDDS2">mutualistic</a> association with plant roots, an example being in the <a href="/facts/Rhizome/wWDKJrSf">rhizomes</a> of potato plants.<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> Because of this symbiotic relationship, farmers have the ability to increase their crop yields.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> 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.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a> Increased agricultural output can spark economic growth, contribute to food security, and lead to job creation in rural areas.<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> </p><p>As briefly mentioned in previous sections, members of <i>Pseudomonadota</i> have vast metabolic abilities that allow them to utilize and produce a variety of compounds. <a href="/facts/Bioleaching/1FPuznKK">Bioleaching</a>, done by various <i>Thiobacillus</i> species, are a primary example of this.<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> 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 <a href="/facts/Acid_mine_drainage/7v5fEICa">acid mine drainage</a>. Bioleaching has significant economic promise if it can be controlled and not cause any further harm to the environment.<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> </p> <h3>Ecological impact</h3> <p>Pseudomonadota are microbes commonly found within soil systems.<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> Microbes play a crucial role in the surrounding ecosystem by performing functions such as <a href="/facts/Nutrient_cycle/S57nuGbQ">nutrient cycling</a>, carbon dioxide fixation, <a href="/facts/Decomposition/6Bve4pgl">decomposition</a>, and nitrogen fixation.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> Pseudomonadota can be described as <a href="/facts/Phototroph/g8gH5q72">phototrophs</a>, <a href="/facts/Heterotroph/wtzlgBtz">heterotrophs</a>, and <a href="/facts/Lithotroph/1CboHMzX">lithotrophs</a>. As heterotrophs (examples <i><a href="/facts/Pseudomonas/FKEX7p7K">Pseudomonas</a></i> and <i><a href="/facts/Xanthomonas/3meF29Hv">Xanthomonas</a></i>) these bacteria are effective in breaking down organic matter, contributing to nutrient cycling.<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> Additionally, photolithotrophs within the phylum are able to perform photosynthesis using sulfide or elemental sulfur as <a href="/facts/Electron_donor/7JxwwW43">electron donors</a>, which enables them to participate in carbon fixation and oxygen production even in <a href="/facts/Anaerobic_respiration/IMSY03HG">anaerobic</a> conditions.<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> These Pseudomonadota bacteria are also considered <a href="/facts/Copiotroph/0ExwNYBk">copiotrophic</a> organisms, meaning they can be found in environments with high nutrient availability.<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> 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.<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> </p><p>Because this phylum are able to form a symbiotic relationship with plant roots, incorporating Pseudomonadota into agricultural practices aligns with principles of <a href="/facts/Sustainable_agriculture/XLdTEVAC">sustainable farming</a>.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a><a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a> These bacteria contribute to soil health and fertility, promote natural pest management, and enhance the resilience of crops to environmental stressors.<a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/List_of_bacteria_genera/a25ukgSb">List of bacteria genera</a></li> <li><a href="/facts/List_of_bacterial_orders/ujvD930b">List of bacterial orders</a></li></ul> <h2 id="external-links">External links</h2> <a href="/facts/Wikispecies/b2GhA7Le">Wikispecies</a> has information related to <i>Pseudomonadota</i>. <ul><li><a href="http://www.palaeos.org/Proteobacteria">Pseudomonadota information</a> from <a href="/facts/Palaeos/BDA8FEfv">Palaeos</a>. <a href="https://web.archive.org/web/20100523075109/http://www.palaeos.org/Proteobacteria">Archived</a> 2010-05-23 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Rizzatti G, Lopetuso LR, Gibiino G, Binda C, Gasbarrini A (2017). 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