Degradation of Aromatic Compounds Coupled to Selenate Reduction

Knight, Victoria K.; Nijenhuis, Ivonne; Kerkhof, Lee J.; Häggblom, Max M.

doi:10.1080/014904502317246183

Cited by 21 publications

(17 citation statements)

References 25 publications

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“…Sulfate reduction was inhibited by selenate addition and part of the DIC production was attributed to microbial carbon oxidation coupled to selenate reduction. In sediments, selenate is usually reduced to selenite or elemental selenium (Se1) (Majers et al, 1988;Steinberg & Oremland, 1990;Oremland et al, 1994a;Stolz & Oremland, 1999;Herbel et al, 2000;Lucas & Hollibaugh, 2001;Knight et al, 2002). As selenite accumulated only towards the end of the incubation at very low rates, reduction to Se1 was assumed for the calculation of the contribution of selenate reduction to DIC production (Table 3).…”

Section: Contribution Of Different Electron Acceptors To Dissolved Inmentioning

confidence: 99%

Acetate, lactate, propionate, and isobutyrate as electron donors for iron and sulfate reduction in Arctic marine sediments, Svalbard

Finke

Vandieken

Jørgensen

2007

FEMS Microbiology Ecology

137

105

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The contribution of volatile fatty acids (VFA) as e(-)-donors for anaerobic terminal oxidation of organic carbon through iron and sulfate reduction was studied in Arctic fjord sediment. Dissolved inorganic carbon, Fe(2+), VFA concentrations, and sulfate reduction were monitored in slurries from the oxidized (0-2 cm) and the reduced (5-9 cm) zone. In the 0-2 cm layer, 2/3 of the mineralization could be attributed to sulfate reduction and 1/3 to iron reduction. In the 5-9 cm layer, sulfate reduction was the sole mineralization process. Acetate and lactate turnover rates were measured by radiotracer. Inhibition of sulfate reduction with selenate resulted in the accumulation of acetate, propionate, and isobutyrate. The acetate turnover rates determined by radiotracer and accumulation after inhibition were similar. VFA turnover accounted for 21% and 52% of the mineralization through sulfate reduction in the 0-2 and 5-9 cm layer, respectively. Acetate and lactate turnover in the inhibited 0-2 cm slurry was attributed to iron reduction and accounted for 10% and 2% of the iron reduction. Therefore, 88% and 79% of the iron and sulfate reduction in the 0-2 cm layer, respectively, must be fueled by alternative e(-)-donors. The accumulation of VFA in the selenate-inhibited 0-2 cm slurry did not enhance iron reduction, indicating that iron reducers were not limited by VFA availability.

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Section: Contribution Of Different Electron Acceptors To Dissolved Inmentioning

confidence: 99%

Acetate, lactate, propionate, and isobutyrate as electron donors for iron and sulfate reduction in Arctic marine sediments, Svalbard

Finke

Vandieken

Jørgensen

2007

FEMS Microbiology Ecology

137

105

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“…The selenium oxyanions, sulfate, nitrate, nitrite, chlorate, and arsenate were analyzed using ion chromatography (DX120; Dionex, Sunnyvale, CA) and benzoates with high-performance liquid chromatography as described previously (19). Organic acids acetate, citrate, lactate and pyruvate were measured using the same high-performance liquid chromatography and UV detection at 210 nm with a HPX-87H organic acid column (Bio-Rad, Hercules, CA), heated to 60°C.…”

Section: Methodsmentioning

confidence: 99%

“…The samples were stored at 4°C until used. Enrichment cultures were established with a 10% (wt/vol) sediment inoculum as a slurry in anaerobic minimal salt medium (11) by using a strict anaerobic technique (19) with Na 2 SeO 4 (10 mM) as the sole electron acceptor and 4-hydroxybenzoate (250 M) or pyruvate (5 mM) or both as electron donors and carbon sources. Cultures were incubated in the dark, statically at 28°C.…”

Section: Methodsmentioning

confidence: 99%

Identification of Anaerobic Selenate-Respiring Bacteria from Aquatic Sediments

Narasingarao

Häggblom

2007

Appl Environ Microbiol

103

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The diversity population of microorganisms with the capability to use selenate as a terminal electron acceptor, reducing it to selenite and elemental selenium by the process known as dissimilatory selenate reduction, is largely unknown. The overall objective of this study was to gain an in-depth understanding of anaerobic biotransformation of selenium in the environment, particularly anaerobic respiration, and to characterize the microorganisms catalyzing this process. Here, we demonstrate the isolation and characterization of four novel anaerobic dissimilatory selenate-respiring bacteria enriched from a variety of sources, including sediments from three different water bodies in Chennai, India, and a tidal estuary in New Jersey. Strains S5 and S7 from India, strain KM from the Meadowlands, NJ, and strain pn1, categorized as a laboratory contaminant, were all phylogenetically distinct, belonging to various phyla in the bacterial domain. The 16S rRNA gene sequence shows that strain S5 constitutes a new genus belonging to Chrysiogenetes, while strain S7 belongs to the Deferribacteres, with greater than 98% 16S rRNA gene similarity to Geovibrio ferrireducens. Strain KM is related to Malonomonas rubra, Pelobacter acidigallici, and Desulfuromusa spp., with 96 to 97% 16S rRNA gene similarity. Strain pn1 is 99% similar to Pseudomonas stutzeri. Strains S5, S7, and KM are obligately anaerobic selenate-respiring microorganisms, while strain pn1 is facultatively anaerobic. Besides respiring selenate, all these strains also respire nitrate.

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“…Dissimilatory reduction of selenium oxyanions (SeO 4 2Ϫ and SeO 3 2Ϫ ) is significantly important in the environment and involves conservation of metabolic energy for microorganisms (28). Members of both the Archaea and Bacteria domains can use selenium oxyanions (SeO 4 2Ϫ and SeO 3 2Ϫ ) as terminal electron acceptors and reduce soluble selenate and selenite to insoluble elemental selenium via dissimilatory reduction under anaerobic conditions (29).…”

Section: Selenium-reducing Bacteriamentioning

confidence: 99%

“…Dechloromonas sp. and S. selenatireducens can both couple the oxidation of aliphatic and aromatic compounds to dissimilatory reduction of selenium oxyanions (28). Effective oxidation of organic matter in anaerobic natural environments requires the contribution of microbial communities, such as fermenting and metal-reducing microorganisms (72,73).…”

Section: Ecology Of Selenium-reducing Bacteriamentioning

confidence: 99%

Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

361

232

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SUMMARY In nature, selenium is actively cycled between oxic and anoxic habitats, and this cycle plays an important role in carbon and nitrogen mineralization through bacterial anaerobic respiration. Selenium-respiring bacteria (SeRB) are found in geographically diverse, pristine or contaminated environments and play a pivotal role in the selenium cycle. Unlike its structural analogues oxygen and sulfur, the chalcogen selenium and its microbial cycling have received much less attention by the scientific community. This review focuses on microorganisms that use selenate and selenite as terminal electron acceptors, in parallel to the well-studied sulfate-reducing bacteria. It overviews the significant advancements made in recent years on the role of SeRB in the biological selenium cycle and their ecological role, phylogenetic characterization, and metabolism, as well as selenium biomineralization mechanisms and environmental biotechnological applications.

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Degradation of Aromatic Compounds Coupled to Selenate Reduction

Cited by 21 publications

References 25 publications

Acetate, lactate, propionate, and isobutyrate as electron donors for iron and sulfate reduction in Arctic marine sediments, Svalbard

Acetate, lactate, propionate, and isobutyrate as electron donors for iron and sulfate reduction in Arctic marine sediments, Svalbard

Identification of Anaerobic Selenate-Respiring Bacteria from Aquatic Sediments

Ecology and Biotechnology of Selenium-Respiring Bacteria

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