Characterization of Arsenic-Transforming Bacteria from Arsenic Contaminated Sites in Bulgaria

Krumova, K.; Nikolovska, M.; Groudeva, V.

doi:10.1080/13102818.2008.10817542

Cited by 14 publications

(10 citation statements)

References 22 publications

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“…The arsC gene encodes the enzyme for As(V) reductase, which is responsible for the biotransformation of As(V) to As(III) (Krumova et al, 2008;Musingarimi et al, 2010). After As(V) reduction, the arsB gene acts as a specific efflux pump, which extrudes As(III) from the cytoplasm (Rosen, 2002;Silver and Phung, 2005).…”

Section: Biotransformation Of Dissolved Asmentioning

confidence: 99%

“…Detoxification is an efficient As(V)-reducing mechanism that occurs under both aerobic and anaerobic conditions (Silver and Phung, 2005;Murphy and Saltikov, 2009). During the detoxification process, the arsC gene, which is responsible for the biotransformation of As(V) to As(III) (Krumova et al, 2008;Musingarimi et al, 2010), and the arsB, which extrudes As(III) from the cytoplasm (Rosen, 2002;Silver and Phung, 1996), would be involved. Furthermore, organoarsenicals are presumed to be formed via microbial activities (Cullen and Reimer, 1989).…”

Section: Introductionmentioning

confidence: 99%

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Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia

Guo

Liu

Ding

et al. 2015

Environmental Pollution

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Section: Biotransformation Of Dissolved Asmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia

Guo

Liu

Ding

et al. 2015

Environmental Pollution

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“…The most common available inorganic forms of As are arsenate [As(V)] and arsenite [As(III)] (Buchet and Lauwerys, 1981;Leonard, 1991;Mukhopadhyay et al, 2002). Among the two forms, As(III) is more toxic as it has affinity to bind with functional groups, like SH ¡ and imidazolium nitrogens of different biomolecules, including catalytic proteins (Krumova et al, 2008). On the other hand, As(V) mimics phosphate (PO 4 3¡ ) and thus affects cell metabolism by interfering with phosphorylation processes (Tseng, 2004).…”

Section: Introductionmentioning

confidence: 98%

Fundamentals and Application Potential of Arsenic-Resistant Bacteria for Bioremediation in Rhizosphere: A Review

Mallick

Islam

Mukherjee

2015

Soil and Sediment Contamination: An International Journal

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As a hazardous environmental metalloid toxicant, arsenic (As)-at elevated levels in water and soil-has created a major public health concern through its entry into the food chain by accumulation in crops. Among the various methods reported thus far for reclamation of As-contaminated crop fields, bioremediation using bacteria with plantgrowth-promoting traits has been found to be a most promising solution. There is every possibility that bacterial isolates with the ability to remove or immobilize As could be used for successful bioremediation. However, bioremediation needs to define its boundaries between promise and field application, as most studies have been restricted to laboratory results only. Rhizosphere interactions play a critical role in monitoring As bioavailability to crop plants, thus a better understanding of it might improve rhizoremediation technologies. The challenges rely on the application of these novel approaches under field conditions. Despite some limitations, the prospect for successful stimulation and exploitation of microbial metabolism for As rhizoremediation appears to be very promising.

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“…The oxidation readily occurs under aerobic conditions. Since 1918, when bacteria capable of oxidizing As III in aerobic environments was first recognized (Green 1918), numerous aerobic As III oxidizing bacteria have been identified (Turner 1949; Wang and Suttigarn 2007; Krumova et al 2008). A biodiversity of As metabolizing bacteria isolated from a variety of soil water systems have detectable As III -oxidizing genes (Inskeep et al 2007), indicating As III oxidation plays an important role in the biogeochemical cycle of As.…”

Section: Introductionmentioning

confidence: 99%

Flexible bacterial strains that oxidize arsenite in anoxic or aerobic conditions and utilize hydrogen or acetate as alternative electron donors

et al. 2011

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Arsenic is a carcinogenic compound widely distributed in the groundwater around the world. The fate of arsenic in groundwater depends on the activity of microorganisms either by oxidizing arsenite (AsIII), or by reducing arsenate (AsV). Because of the higher toxicity and mobility of AsIII compared to AsV, microbial-catalyzed oxidation of AsIII to AsV can lower the environmental impact of arsenic. Although aerobic AsIII-oxidizing bacteria are well known, anoxic oxidation of AsIII with nitrate as electron acceptor has also been shown to occur. In this study, three AsIII-oxidizing bacterial strains, Azoarcus sp. strain EC1, Azoarcus sp. strain EC3and Diaphorobacter sp. strain MC, have been characterized. Each strain was tested for its ability to oxidize AsIII with four different electron acceptors, nitrate, nitrite, chlorate and oxygen. Complete AsIII oxidation was achieved with both nitrate and oxygen, demonstrating the novel ability of these bacterial strains to oxidize AsIII in either anoxic or aerobic conditions. Nitrate was only reduced to nitrite. Different electron donors were used to study their suitability in supporting nitrate reduction. Hydrogen and acetate were readily utilized by all the cultures. The flexibility of these AsIII-oxidizing bacteria to use oxygen and nitrate to oxidize AsIII as well as organic and inorganic substrates as alternative electron donors explains their presence in non-arsenic-contaminated environments. The findings suggest that at least some AsIII-oxidizing bacteria are flexible with respect to electron-acceptors and electron-donors and that they are potentially widespread in low arsenic concentration environments.

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Characterization of Arsenic-Transforming Bacteria from Arsenic Contaminated Sites in Bulgaria

Cited by 14 publications

References 22 publications

Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia

Arsenate reduction and mobilization in the presence of indigenous aerobic bacteria obtained from high arsenic aquifers of the Hetao basin, Inner Mongolia

Fundamentals and Application Potential of Arsenic-Resistant Bacteria for Bioremediation in Rhizosphere: A Review

Flexible bacterial strains that oxidize arsenite in anoxic or aerobic conditions and utilize hydrogen or acetate as alternative electron donors

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