Investigating different mechanisms for biogenic selenite transformations:Geobacter sulfurreducens,Shewanella oneidensisandVeillonella atypica

Pearce, Carolyn I.; Pattrick, R. A. D.; Law, Nicholas; Charnock, John; Coker, Victoria S.; Fellowes, Jonathan; Oremland, Ronald S.; Lloyd, Jonathan R.

doi:10.1080/09593330902984751

Cited by 116 publications

(69 citation statements)

References 51 publications

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“…Elemental Se is produced as spherical particles in the nanometer size range, localized either inside or outside the cell. Recent research showed that nanoscale semiconductor materials (also called quantum dots) can be synthesized by using microbial metabolism (53,54,66). Selenium-respiring microorganisms are used to reduce selenium oxyanions to produce selenide, which combines with metal cations (i.e., Cd and Zn) and forms metal selenide (i.e., CdSe and ZnSe) quantum dots.…”

Section: Discussionmentioning

confidence: 99%

“…Microbial methylation of selenium forms volatile compounds, such as dimethyl selenide, dimethyl diselenide, dimethyl selenyl sulfide, hydrogen selenide, and methaneselenol (53,57). Microbial selenium methylation is significant in environmental settings, although it is a slow process (54). For additional details, the reader is referred to excellent reviews on microbial methylation of metalloids (58,59).…”

Section: Se 0 -Respiring Bacteriamentioning

confidence: 99%

“…The biological components associated with SeO 3 2Ϫ reduction influence the crystallization and growth of metal selenide particles by decreasing the crystal growth rate and increasing particle stability (66). Control of the nanoparticle size is critical, however, in manufacturing elemental selenium or chalcogenide nanoparticles by use of bacteria (53,54,77).…”

Section: Microbial Reduction For Nanomanufacturingmentioning

confidence: 99%

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Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

348

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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Section: Discussionmentioning

confidence: 99%

Section: Se 0 -Respiring Bacteriamentioning

confidence: 99%

Section: Microbial Reduction For Nanomanufacturingmentioning

confidence: 99%

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Ecology and Biotechnology of Selenium-Respiring Bacteria

Nancharaiah

2015

Microbiol Mol Biol Rev

348

232

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“…However, they become immobilized when the selenate and selenite are microbially reduced to Se 0 (20). Microbial reduction of Se 0 to selenide (Se 2Ϫ ) has received limited attention, but it is noteworthy that insoluble Se 0 can be reduced microbiologically to soluble selenide (21,22).…”

Section: ϫmentioning

confidence: 99%

Microbial Transformations of Selenium Species of Relevance to Bioremediation

Eswayah

Smith

Gardiner

2016

Appl Environ Microbiol

173

102

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b Selenium species, particularly the oxyanions selenite (SeO 3 2؊ ) and selenate (SeO 4 2؊ ), are significant pollutants in the environment that leach from rocks and are released by anthropogenic activities. Selenium is also an essential micronutrient for organisms across the tree of life, including microorganisms and human beings, particularly because of its presence in the 21st genetically encoded amino acid, selenocysteine. Environmental microorganisms are known to be capable of a range of transformations of selenium species, including reduction, methylation, oxidation, and demethylation. Assimilatory reduction of selenium species is necessary for the synthesis of selenoproteins. Dissimilatory reduction of selenate is known to support the anaerobic respiration of a number of microorganisms, and the dissimilatory reduction of soluble selenate and selenite to nanoparticulate elemental selenium greatly reduces the toxicity and bioavailability of selenium and has a major role in bioremediation and potentially in the production of selenium nanospheres for technological applications. Also, microbial methylation after reduction of Se oxyanions is another potentially effective detoxification process if limitations with low reaction rates and capture of the volatile methylated selenium species can be overcome. This review discusses microbial transformations of different forms of Se in an environmental context, with special emphasis on bioremediation of Se pollution. Since the discovery in 1954 by Pinsent that the oxidation of formate by cell suspensions of Escherichia coli requires growth medium containing molybdate and selenite, there has been a growing interest in the biochemical role of selenium in microorganisms (1). Se is an essential component of selenoamino acids, such as selenomethionine and selenocysteine (the 21st proteinogenic amino acid), that occur in certain types of prokaryotic enzymes. Indeed, the requirement for selenite in E. coli growing on formate is linked to the fact that formate dehydrogenase contains selenocysteine. Other prokaryotic enzymes that contain selenocysteine include glycine reductase in several clostridia, formate dehydrogenases in diverse prokaryotes, including Salmonella, Clostridium, and Methanococcus, as well as hydrogenases in Methanococcus and other anaerobes. In addition, other bacterial Se-dependent enzymes, in which the selenium is part of the active site molybdenum-containing cofactor, include nicotinic acid dehydrogenase and xanthine dehydrogenase, which is present in certain clostridial species (2-4).Reactions that are involved in the cycling of Se in soil, including those influenced by microbes, are diagrammatically summarized in Fig. 1 2Ϫ and was spatially separated from sulfate reduction in the environment despite the presence of substantial concentrations of sulfate where it occurred. Thus, it can be concluded that Se and S have different reductive biogeochemical cycles and appear to involve distinct populations of microorganisms.With respect to the remediation of sel...

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“…Heating was avoided as amorphous Se(0) undergoes a glass transition at temperatures above 30-35 C (Pearce et al, 2009). …”

Section: Chemicalsmentioning

confidence: 99%