Английская Википедия:Geobacter uraniireducens
Шаблон:Short description Шаблон:Italic title Шаблон:Taxobox
Geobacter uraniireducens (more recently known as Geotalea uraniireducens[1]) is a gram-negative, rod-shaped, anaerobic, chemolithotrophic,[2] mesophilic, and motile bacterium from the genus of Geobacter.[3][4][5][6] G. uraniireducens has been found to reduce iron and uranium[7][6][8] in sediment and soil.[2] It is being studied for use in bioremediation projects due to its ability to reduce uranium and arsenic.[9][10][11][12]
History
Geobacter uraniireducens was isolated from the subsurface sediment of a previous uranium ore processing facility undergoing uranium bioremediation in 2002.[11] This occurred during a field study by Robert Anderson and his associates at the Old Rifle in situ test plot area in Rifle, Colorado.[11] Shelobolina et al. (2008) further described the strain Rf4T[6] While Geobacter uraniireducens is the basonym, David Waite and associates reclassified it to the current preferred name, Geotalea uraniireducens in their 2020 paper.[1]
Characteristics
G. uraniireducens are gram negative bacteria that are motile rods with rounded ends and two to four long lateral flagellum, as well as pili and vesicles.[6]
Extracellular electron transport strategies
The strategy of G. uraniireducens for extracellular electron transport (EET) is to facilitate iron (Fe(III)) oxide reduction via the production of a soluble electron shuttle.[13] It has been found that riboflavin mediates EET to reduce extracellular electron acceptors.[14] This is important because unlike in most Geobacter species, where conductive pili are critical for effective reduction of extracellular electron acceptors, the pili of G. uraniireducens are not conductive.[14]
Metabolic mechanisms
G. uraniireducens is an iron-reducing bacteria that uses acetate as an electron donor and reduces uranium (U(VI)).[6] In addition to Fe(III), it is also able to use Mn(IV), anthraquinone-2,6-disulfonate, malate and fumarate as electron acceptors.[6] As it uses Fe(III) oxide as the electron acceptor, it can oxidize acetate, lactate, pyruvate and ethanol as electron donors.[6]
Applications
Bioremediation
G. uraniireducens have been used in bioremediation studies in situ to decontaminate groundwater containing high levels of uranium from previous activities.[9][10][11] This process can be enhanced by using acetate to stimulate increased populations.[11]
Environmental implications
One environmental implication of interest in G. uraniireducens is its arsenic (As(V)) reducing capabilities in subsurface sediments.[12] This ability is proposed to be due to gene encoding for respiratory arsenate reductase.[12]
See also
References
External links
Шаблон:Bacteria classification Шаблон:Taxonbar
- ↑ 1,0 1,1 Шаблон:Cite journal
- ↑ 2,0 2,1 Шаблон:Cite web
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокGeobacter-uraniireducensне указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокUniProtне указан текст - ↑ Шаблон:Cite journal
- ↑ 6,0 6,1 6,2 6,3 6,4 6,5 6,6 Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite web
- ↑ 9,0 9,1 Шаблон:Cite journal
- ↑ 10,0 10,1 Шаблон:Cite journal
- ↑ 11,0 11,1 11,2 11,3 11,4 Шаблон:Cite journal
- ↑ 12,0 12,1 12,2 Шаблон:Citation
- ↑ Шаблон:Cite journal
- ↑ 14,0 14,1 Шаблон:Cite journal
