American microbiologist
Carl Woese established this grouping in 1987, calling it informally the "purple bacteria and their relatives".[12] The group was later formally named the 'Proteobacteria' after the Greek god Proteus, who was known to assume many forms.[13] In 2021 the
International Committee on Systematics of Prokaryotes designated the synonym Pseudomonadota, and renamed many other prokaryotic phyla as well.[1] This renaming of several
prokaryote 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.[14] The phylum Pseudomonadota encompasses classes Acidithiobacilia, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Hydrogenophilia, and Zetaproteobacteria.[11] The phylum includes a wide variety of
pathogenic genera, such as Escherichia, Salmonella, Vibrio, Yersinia, Legionella, and many others.[15] Others are free-living (non-
parasitic) and include many of the
bacteria responsible for
nitrogen fixation.[16]
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.[17]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).[17]
The class Epsilonpreotobacteria was additionally identified within the Pseudomonadota phylum. This class is characterized by its significance as
chemolithotrophic primary producers and its metabolic prowess in deep-sea
hydrothermal vent ecosystems.[18] Noteworthy pathogenic genera within this class include Campylobacter,
Helicobacter, and
Arcobacter. Analysis of phylogenetic tree topology and genetic markers revealed the direct divergence of Epsilonproteobacteria from the Pseudomonadota phylum.[18] Limited
outgroup data and low bootstrap values support these discoveries. Despite further investigations, consensus has not been reached regarding the
monophyletic nature of Epsilonproteobacteria within Proteobacteria, prompting researchers to propose its taxonomic separation from the phylum. The proposed reclassification of the name Epsilonproteobacteria is Campylobacterota.[18]
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.[21][22][23] The genus Acidithiobacillus, part of the Gammaproteobacteria until it was transferred to class Acidithiobacillia in 2013,[2] was previously regarded as
paraphyletic to the Betaproteobacteria according to
multigenome alignment studies.[24] In 2017, the
Betaproteobacteria was subject to major revisions and the class
Hydrogenophilalia was created to contain the order
Hydrogenophilales[4]
Pseudomonadota classes with validly published names include some prominent genera:[25] e.g.:
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.[32] Most Pseudomonadota are motile and move using flagella. Many move about using
flagella, but some are nonmotile, or rely on
bacterial gliding.[33]
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.[34]
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.[35] The
mitochondria of eukaryotes are thought to be descendants of an alphaproteobacterium.[36]
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.[37]
The
Gammaproteobacteria are one of the largest classes in terms of genera, containing approximately 250 validly published names.[24] 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.[35]
The
Hydrogenophilalia are thermophilic chemoheterotrophs and autotrophs.[38] 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
Hydrogenophilaceae which contains the genera Thiobacillus, Petrobacter, Sulfuricella,Hydrogenophilus and Tepidiphilus. Currently, no members of this class have been identified as pathogenic.[39]
The
Zetaproteobacteria are the
iron-oxidizingneutrophilicchemolithoautotrophs, distributed worldwide in estuaries and marine habitats.[33] 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.[40] The only confirmed type order for this class is the
Mariprofundaceae, which does not contain any known pathogenic species.[41]
Transformation
Transformation, a process in which genetic material passes from one bacterium to another,[42] has been reported in at least 30 species of Pseudomonadota distributed in the classes alpha, beta, and gamma.[43] The best-studied Pseudomonadota with respect to natural genetic transformation are the medically important human pathogens Neisseria gonorrhoeae (class beta), and Haemophilus influenzae (class gamma).[44] 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
DNA repair process that protects the pathogen's DNA from attack by their host's phagocytic defenses that employ
oxidative free radicals.[44]
Habitat
Due to the distinctive nature of each of the six classes of Pseudomonadota, this phylum occupies a multitude of habitats. These include:
Studies have suggested Pseudomonadota as a relevant signature of disease in the human
gastrointestinal (GI) tract, by operating as a marker for microbiota instability.[10] The human gut
microbiome consists mainly of four phyla:
Firmicutes,
Bacteroidetes,
Actinobacteria, and Pseudomonadota.[10] 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.[10] The gut microbiome conducts processes like nutrient synthesis, chemical
metabolismtabolism, and the formation of the gut barrier.[10] 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.[10] 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.[50] 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.[51]
Classes Betaproteobacteria and Gammaproteobacteria are prevalent within the human oral cavity, and are markers for good oral health.[45] The oral microbiome consists of 11 habitats, including the tongue dorsum,
hard palate, tonsils, throat, saliva, and more.[52] Changes in the oral microbiome are due to
endogenous and
exogenous factors like host lifestyle,
genotype, environment, immune system, and
socioeconomic status.[52] 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.[52]
Economic Value
Pseudomonadota bacteria have a
symbiotic or
mutualistic association with plant roots, an example being in the
rhizomes of potato plants.[53] Because of this symbiotic relationship, farmers have the ability to increase their crop yields.[53] 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.[54] Increased agricultural output can spark economic growth, contribute to food security, and lead to job creation in rural areas.[55]
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.[56] 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.[34]
Ecological Impact
Pseudomonadota are microbes commonly found within soil systems.[53] Microbes play a crucial role in the surrounding ecosystem by performing functions such as
nutrient cycling, carbon dioxide fixation,
decomposition, and nitrogen fixation.[57] 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.[57] 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.[57] These Pseudomonadota bacteria are also considered
copiotrophic organisms, meaning they can be found in environments with high nutrient availability.[57] 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.[57]
Because this phylum are able to form a symbiotic relationship with plant roots, incorporating Pseudomonadota into agricultural practices aligns with principles of
sustainable farming.[58][53] These bacteria contribute to soil health and fertility, promote natural pest management, and enhance the resilience of crops to environmental stressors.[58]
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