Proteobacteria: Difference between revisions

Jump to navigation Jump to search
No edit summary
 
No edit summary
 
Line 105: Line 105:
{{Bacterial diseases}}
{{Bacterial diseases}}
</br>
</br>
[[ca:Proteobacteri]]
{{SIB}}
[[de:Proteobacteria]]
[[es:Proteobacteria]]
[[fr:Proteobacteria]]
[[it:Proteobacteria]]
[[he:חיידקים ארגמניים]]
[[lt:Proteobakterijos]]
[[ja:プロテオバクテリア]]
[[no:Proteobacteria]]
[[pt:Proteobacteria]]
[[tr:Proteobacteria]]
[[uk:Протеобактерії]]
[[zh:變形菌門]]
{{WikiDoc Help Menu}}
{{WikiDoc Help Menu}}
{{WikiDoc Sources}}
{{WikiDoc Sources}}

Latest revision as of 18:20, 28 May 2009

Proteobacteria
Escherichia coli
Scientific classification
Domain: Bacteria
Phylum: Proteobacteria
Stackebrandt et al., 1986
Orders

Alpha Proteobacteria
   Caulobacterales - e.g. Caulobacter
   Parvularculales
   Rhizobiales - e.g. rhizobia
   Rhodobacterales
   Rhodospirillales - e.g. Acetobacter
   Rickettsiales - e.g. Rickettsia
   Sphingomonadales e.g. Sphingomonas

Beta Proteobacteria
   Burkholderiales - e.g. Bordetella
   Hydrogenophilales
   Methylophilales
   Neisseriales - e.g. Neisseria
   Nitrosomonadales
   Rhodocyclales
   Procabacteriales

Gamma Proteobacteria
   Acidithiobacillales
   Aeromonadales - e.g. Aeromonas
   Alteromonadales - e.g. Pseudoalteromonas
   Cardiobacteriales
   Chromatiales - purple sulfur bacteria
   Enterobacteriales - e.g. Escherichia
   Legionellales - e.g. Legionella
   Methylococcales
   Oceanospirillales
   Pasteurellales - e.g. Haemophilus
   Pseudomonadales - e.g. Pseudomonas
   Thiotrichales - e.g. Thiomargarita
   Vibrionales - e.g. Vibrio
   Xanthomonadales - e.g. Xanthomonas

Delta Proteobacteria
   Bdellovibrionales - e.g. Bdellovibrio
   Desulfobacterales
   Desulfovibrionales
   Desulfurellales
   Desulfarcales
   Desulfuromonadales - e.g. Geobacter
   Myxococcales - Myxobacteria
   Syntrophobacterales

Epsilon Proteobacteria
   Campylobacterales - e.g. Helicobacter
   Nautiliales

WikiDoc Resources for Proteobacteria

Articles

Most recent articles on Proteobacteria

Most cited articles on Proteobacteria

Review articles on Proteobacteria

Articles on Proteobacteria in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Proteobacteria

Images of Proteobacteria

Photos of Proteobacteria

Podcasts & MP3s on Proteobacteria

Videos on Proteobacteria

Evidence Based Medicine

Cochrane Collaboration on Proteobacteria

Bandolier on Proteobacteria

TRIP on Proteobacteria

Clinical Trials

Ongoing Trials on Proteobacteria at Clinical Trials.gov

Trial results on Proteobacteria

Clinical Trials on Proteobacteria at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Proteobacteria

NICE Guidance on Proteobacteria

NHS PRODIGY Guidance

FDA on Proteobacteria

CDC on Proteobacteria

Books

Books on Proteobacteria

News

Proteobacteria in the news

Be alerted to news on Proteobacteria

News trends on Proteobacteria

Commentary

Blogs on Proteobacteria

Definitions

Definitions of Proteobacteria

Patient Resources / Community

Patient resources on Proteobacteria

Discussion groups on Proteobacteria

Patient Handouts on Proteobacteria

Directions to Hospitals Treating Proteobacteria

Risk calculators and risk factors for Proteobacteria

Healthcare Provider Resources

Symptoms of Proteobacteria

Causes & Risk Factors for Proteobacteria

Diagnostic studies for Proteobacteria

Treatment of Proteobacteria

Continuing Medical Education (CME)

CME Programs on Proteobacteria

International

Proteobacteria en Espanol

Proteobacteria en Francais

Business

Proteobacteria in the Marketplace

Patents on Proteobacteria

Experimental / Informatics

List of terms related to Proteobacteria

Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us [1] to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.

Overview

The Proteobacteria are a major group (phylum) of bacteria. They include a wide variety of pathogens, such as Escherichia, Salmonella, Vibrio, Helicobacter, and many other notable genera.[1] Others are free-living, and include many of the bacteria responsible for nitrogen fixation. The group is defined primarily in terms of ribosomal RNA (rRNA) sequences, and is named for the Greek god Proteus (also the name of a bacterial genus within the Proteobacteria), who could change his shape, because of the great diversity of forms found in this group.[2]

All Proteobacteria are Gram-negative, with an outer membrane mainly composed of lipopolysaccharides. Many move about using flagella, but some are non-motile or rely on bacterial gliding. The last include the myxobacteria, a unique group of bacteria that can aggregate to form multicellular fruiting bodies. There is also a wide variety in the types of metabolism. Most members are facultatively or obligately anaerobic and heterotrophic, but there are numerous exceptions. A variety of genera, which are not closely related to each other, convert energy from light through photosynthesis. These are called purple bacteria, referring to their mostly reddish pigmentation.

Cavalier-Smith has postulated that Proteobacteria is part of the bacterial clade Gracilicutes.

Sections/Classes

The proteobacteria are divided into five sections, referred to by the Greek letters alpha through epsilon, again based on rRNA sequences. These are often treated as classes. Note the Gamma Proteobacteria are paraphyletic to the Beta Proteobacteria.

Alphaproteobacteria

The Alphaproteobacteria comprise most phototrophic genera, but also several genera metabolising C1-compounds (e.g. Methylobacterium), symbionts of plants (e.g. Rhizobia) and animals, and a group of dangerous pathogens, the Rickettsiaceae. Moreover the precursors of the mitochondria of eukaryotic cells are thought to have originated in this bacterial group. (See endosymbiotic theory.)

Betaproteobacteria

The Betaproteobacteria consist of several groups of aerobic or facultative bacteria which are often highly versatile in their degradation capacities, but also contain chemolithotrophic genera (e.g. the ammonia-oxidising genus Nitrosomonas) and some phototrophs (genera Rhodocyclus and Rubrivivax). Beta Proteobacteria play an important role in nitrogen fixation in various types of plants, oxidizing ammonium to produce nitrite- an important chemical for plant function. Many of them are found in environmental samples, such as waste water or soil. Pathogenic species within this class are the Neisseriaceae (gonorrhea and meningoencephalitis) and species of the genus Burkholderia.

Gammaproteobacteria

Vibrio cholerae
Vibrio cholerae

The Gammaproteobacteria comprise several medically and scientifically important groups of bacteria, such as the Enterobacteriaceae, Vibrionaceae and Pseudomonadaceae. An exceeding number of important pathogens belongs to this class, e.g. Salmonella (enteritis and typhoid fever), Yersinia pestis (plague), Vibrio (cholera), Pseudomonas aeruginosa (lung infections in hospitalized or cystic fibrosis patients), and Escherichia coli O157:H7 (food posioning).

Deltaproteobacteria

The Deltaproteobacteria comprise a branch of predominantly aerobic genera, the fruiting-body-forming myxobacteria, and a branch of strictly anaerobic genera, which contains most of the known sulfate- (Desulfovibrio, Desulfobacter, Desulfococcus, Desulfonema, etc.) and sulfur-reducing bacteria (e.g. Desulfuromonas) alongside several other anaerobic bacteria with different physiology (e.g. ferric iron-reducing Geobacter and syntrophic Pelobacter and Syntrophus species).

Epsilonproteobacteria

Helicobacter pylori Helicobacter pylori
Helicobacter pylori Helicobacter pylori

The Epsilonproteobacteria consist of only a few genera, mainly the curved to spirilloid Wolinella, Helicobacter, and Campylobacter. Most of the known species inhabit the digestive tract of animals and humans and serve as symbionts (Wolinella in cows) or pathogens (Helicobacter in the stomach, Campylobacter in the duodenum). There have also been numerous environmental sequences of epsilons recovered from hydrothermal vent and cold seep habitats.


References

  1. Madigan M; Martinko J (editors). (2005). Brock Biology of Microorganisms (11th ed. ed.). Prentice Hall. ISBN 0131443291.
  2. "Proteobacteria". Discover Life: Tree of Life. Retrieved 2007-02-09.

External links

Template:Bacterial diseases
Template:SIB

Template:WikiDoc Sources