Isolation of Tellurite- and Selenite-Resistant Bacteria from Hydrothermal Vents of the Juan de Fuca Ridge in the Pacific Ocean

Rathgeber, Christopher; Yurkova, Natalia; Stackebrandt, Erko; Beatty, J. Thomas; Yurkov, Vladimir

doi:10.1128/aem.68.9.4613-4622.2002

Cited by 102 publications

(67 citation statements)

References 58 publications

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“…On the other hand, the ocean water near hydrothermal vents is rich in heavy metals and salt. Rathgeber (2002) isolated ten microbial strains which were found salt tolerant, pH tolerant, and thermotolerant and observed the accumulation of metallic tellurium or selenium. According to the results of 16S rDNA phylogenetic analyses, these isolates form a branch closely related to members of the genus Pseudoalteromonas, which would be excellent heavy metal-resistant halophilic microorganisms for the wastewater treatment (Rathgeber, 2002).…”

Section: Detoxification Of Heavy Metalsmentioning

confidence: 99%

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Zhuang

Han

Zhang

et al. 2010

Environmental Pollution

146

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Review on the decontaminative capabilities of halophilic microorganisms in saline wastewater and soil. a r t i c l e i n f o a b s t r a c tEnvironments with high-salt concentrations are often populated by dense microbial communities. Halophilic microorganisms can be isolated from different saline environments and different strains even belonging to the same genus have various applications. Wastewater and soil rich in both organic matter and salt are difficult to treat using conventional microorganisms typically found in wastewater treatment and soil bioremediation facilities. Studies on decontaminative capabilities and decontamination pathways of organic contaminants (i.e., aromatic compounds benzoate, cinnamate, 3-phenylpropionate, 4-hydroxybenzoic acid), heavy metals (i.e., tellurium, vanadium), and nutrients in the biological treatment of saline wastewater and soil by halophilic microorganisms are discussed in this review.

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Section: Detoxification Of Heavy Metalsmentioning

confidence: 99%

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Zhuang

Han

Zhang

et al. 2010

Environmental Pollution

146

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“…In most environments sampled to date, tellurite-resistant organisms comprise ϳ10% of the total culturable microbial population (26,28,32,34). Resistance to tellurite has been reported in a few Gram-positive bacteria (2,26,33) and in a number of 7,10,13,22,27,38).…”

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confidence: 99%

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

Ollivier

Bahrou

Church

et al. 2011

Appl Environ Microbiol

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We previously described a marine, tellurite-resistant strain of the yeast Rhodotorula mucilaginosa that both precipitates intracellular Te(0) and volatilizes methylated Te compounds when grown in the presence of the oxyanion tellurite. The uses of microbes as a "green" route for the production of Te(0)-containing nanostructures and for the remediation of Te-oxyanion wastes have great potential, and so a more thorough understanding of this process is required. Here, Te precipitation and volatilization catalyzed by R. mucilaginosa were examined in continuously aerated and sealed (low oxygen concentration) batch cultures. Continuous aeration was found to strongly promote Te volatilization while inhibiting Te(0) precipitation. This differs from the results in sealed batch cultures, for which tellurite reduction to Te(0) was found to be very efficient. We show also that volatile Te species may be degraded rapidly in medium and converted to the particulate form by biological activity. Further experiments revealed that Te(0) precipitates produced by R. mucilaginosa can be further transformed to volatile and dissolved Te species. However, it was not clearly determined whether Te(0) is a required intermediate for Te volatilization. Based on these results, we conclude that low oxygen concentrations will be the most efficient for production of Te(0) nanoparticles while limiting the production of toxic volatile Te species, although the production of these compounds may never be completely eliminated. 9), and there has been interest in the microbial production of Te-containing nanoparticles (3) for applications such as composite or compound nanomaterials in solar cells and as an alternative for bench-scale syntheses. We recently described (26) a series of obligately aerobic, tellurite-resistant microbes isolated from salt marsh sediments that efficiently produce intracellular Te-containing nanostructures in a complex growth medium without any specialized growth requirements. The same strains also volatilized a small proportion of the supplied Te as methylated species. Here we further describe the interactions of one of these organisms, the yeast Rhodotorula mucilaginosa, with Te and how these interactions are modulated by aeration.In aerobic soils and aquatic environments, tellurium occurs primarily as the tellurite [TeO 3 2Ϫ or Te(IV)] and tellurate [TeO 4 2Ϫ or Te(VI)] oxyanions. While tellurite is the most water soluble, both are freely available to living organisms.Tellurite has been employed as an antimicrobial therapeutic agent (31, 34), and it is about 10 times more toxic to both Gram-positive and Gram-negative microorganisms than tellurate (37, 39). Tellurite toxicity may be related to its activity as a strong oxidizing agent toward biological materials (17,25,34), although some disagree with this model (40).Microbial tellurite resistance is a widespread phenomenon. In most environments sampled to date, tellurite-resistant organisms comprise ϳ10% of the total culturable microbial population (26,28,32,34). Resistan...

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“…Tellurite is more toxic to mammalian cells (43) and microorganisms (38) than are several heavy metals, e.g., mercury, cadmium, zinc, chromium, and cobalt, which are objects of major public health concern (38). Depending on the strain, the concentration of tellurite inhibiting microbial growth ranges from 1 to 1,000 g/ml (34,38,(46)(47)(48). Microorganisms counteract tellurite (TeO 3 2Ϫ ) toxicity in several ways, namely, by (i) decreasing its uptake, (ii) enhancing its efflux, or (iii) chemically modifying it through methylation or reduction to the less toxic elemental tellurium (Te 0 ) (8).…”

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confidence: 99%

The Thiol:Disulfide Oxidoreductase DsbB Mediates the Oxidizing Effects of the Toxic Metalloid Tellurite (TeO₃²⁻) on the Plasma Membrane Redox System of the Facultative PhototrophRhodobacter capsulatus

et al. 2007

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The highly toxic oxyanion tellurite (TeO 3 2؊ ) is a well known pro-oxidant in mammalian and bacterial cells. This work examines the effects of tellurite on the redox state of the electron transport chain of the facultative phototroph Rhodobacter capsulatus, in relation to the role of the thiol:disulfide oxidoreductase DsbB. Under steady-state respiration, the addition of tellurite (2.5 mM) to membrane fragments generated an extrareduction of the cytochrome pool (c-and b-type hemes); further, in plasma membranes exposed to tellurite (0.25 to 2.5 mM) and subjected to a series of flashes of light, the rate of the QH 2 :cytochrome c (Cyt c) oxidoreductase activity was enhanced. The effect of tellurite was blocked by the antibiotics antimycin A and/or myxothiazol, specific inhibitors of the QH 2 :Cyt c oxidoreductase, and, most interestingly, the membrane-associated thiol: disulfide oxidoreductase DsbB was required to mediate the redox unbalance produced by the oxyanion. Indeed, this phenomenon was absent from R. capsulatus MD22, a DsbB-deficient mutant, whereas the tellurite effect was present in membranes from MD22/pDsbB WT , in which the mutant gene was complemented to regain the wild-type DsbB phenotype. These findings were taken as evidence that the membrane-bound thiol:disulfide oxidoreductase DsbB acts as an "electron conduit" between the hydrophilic metalloid and the lipid-embedded Q pool, so that in habitats contaminated with subinhibitory amounts of Te IV , the metalloid is likely to function as a disposal for the excess reducing power at the Q-pool level of facultative phototrophic bacteria.In the environment, tellurium (Te) exists in its elementalTe 0 -inorganic-telluride (Te 2Ϫ ), tellurite (TeO 3 2Ϫ ), and tellurate (TeO 4 2Ϫ )-and organic-dimethyl telluride (CH 3 TeCH 3 )-forms (8). Of these, the toxic oxyanion forms, TeO 3 2Ϫ and TeO 4 2Ϫ , are more common than and are highly soluble compared to nontoxic elemental tellurium, Te 0 (38). Tellurium is widely used in the electronics industry, for photoreceptors, thermocouples, and batteries, but also in metallurgical processes and as an additive to industrial glasses (8). As a result, microorganisms are now becoming exposed to abnormal concentrations of this element, and bacterial species resistant to tellurium can easily be isolated from industrial sludge (38). However, research into the anthropogenic emission of Tebased compounds is scarce, and the implications for selection of microorganisms resistant to tellurite (TeO 3 2Ϫ ) and tellurate (TeO 4 2Ϫ ) are largely unexplored (40). Tellurite is more toxic to mammalian cells (43) and microorganisms (38) than are several heavy metals, e.g., mercury, cadmium, zinc, chromium, and cobalt, which are objects of major public health concern (38). Depending on the strain, the concentration of tellurite inhibiting microbial growth ranges from 1 to 1,000 g/ml (34,38,(46)(47)(48). Microorganisms counteract tellurite (TeO 3 2Ϫ ) toxicity in several ways, namely, by (i) decreasing its uptake, (ii) enhancing its effl...

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Isolation of Tellurite- and Selenite-Resistant Bacteria from Hydrothermal Vents of the Juan de Fuca Ridge in the Pacific Ocean

Cited by 102 publications

References 58 publications

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

The Thiol:Disulfide Oxidoreductase DsbB Mediates the Oxidizing Effects of the Toxic Metalloid Tellurite (TeO₃²⁻) on the Plasma Membrane Redox System of the Facultative PhototrophRhodobacter capsulatus

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Isolation of Tellurite- and Selenite-Resistant Bacteria from Hydrothermal Vents of the Juan de Fuca Ridge in the Pacific Ocean

Cited by 102 publications

References 58 publications

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Progress in decontamination by halophilic microorganisms in saline wastewater and soil

Aeration Controls the Reduction and Methylation of Tellurium by the Aerobic, Tellurite-Resistant Marine Yeast Rhodotorula mucilaginosa

The Thiol:Disulfide Oxidoreductase DsbB Mediates the Oxidizing Effects of the Toxic Metalloid Tellurite (TeO32−) on the Plasma Membrane Redox System of the Facultative PhototrophRhodobacter capsulatus

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The Thiol:Disulfide Oxidoreductase DsbB Mediates the Oxidizing Effects of the Toxic Metalloid Tellurite (TeO₃²⁻) on the Plasma Membrane Redox System of the Facultative PhototrophRhodobacter capsulatus