Bioprocessing of seleno-oxyanions and tellurite in a novel Bacillus sp. strain STG-83: A solution to removal of toxic oxyanions in presence of nitrate

Soudi, Mohammad Reza; Tajer-Mohammad-Ghazvini, Parisa; Khajeh, Khosro; Gharavi, Sara

doi:10.1016/j.jhazmat.2008.09.065

Cited by 30 publications

(18 citation statements)

References 48 publications

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“…Previous studies indicated that the rate of DMTe production by Pseudomonas fluorescens K27 was maximal as the culture reached stationary phase (5), and more recent work showed that volatile Te above cultures of Bacillus sp. STG-83 was produced during log phase (30). Our results are consistent with these reports, but a more thorough investigation of volatilization rates in short-term incubations is required to determine how Te volatilization is linked to cell growth in R. mucilaginosa.…”

Section: Discussionsupporting

confidence: 89%

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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Section: Discussionsupporting

confidence: 89%

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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“…ZYM-12Zhao et al [19] Bacillus sp. STG-831.25Soudi et al [21] Corynebacterium diphtheriae 1Tucker et al [18] Paenibacillus TeW1Chien et al [22] Bacillus sp. BZ0.8Zare et al [20] …”

Section: Discussionmentioning

confidence: 99%

Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

et al. 2016

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BackgroundTellurite (TeO3 2−) is recognized as a toxic oxyanion to living organisms. However, mainly anaerobic or facultative-anaerobic microorganisms are able to tolerate and convert TeO3 2− into the less toxic and available form of elemental Tellurium (Te0), producing Te-deposits or Te-nanostructures. The use of TeO3 2−-reducing bacteria can lead to the decontamination of polluted environments and the development of “green-synthesis” methods for the production of nanomaterials. In this study, the tolerance and the consumption of TeO3 2− have been investigated, along with the production and characterization of Te-nanorods by Rhodococcus aetherivorans BCP1 grown under aerobic conditions.ResultsAerobically grown BCP1 cells showed high tolerance towards TeO3 2− with a minimal inhibitory concentration (MIC) of 2800 μg/mL (11.2 mM). TeO3 2− consumption has been evaluated exposing the BCP1 strain to either 100 or 500 μg/mL of K2TeO3 (unconditioned growth) or after re-inoculation in fresh medium with new addition of K2TeO3 (conditioned growth). A complete consumption of TeO3 2− at 100 μg/mL was observed under both growth conditions, although conditioned cells showed higher consumption rate. Unconditioned and conditioned BCP1 cells partially consumed TeO3 2− at 500 μg/mL. However, a greater TeO3 2− consumption was observed with conditioned cells. The production of intracellular, not aggregated and rod-shaped Te-nanostructures (TeNRs) was observed as a consequence of TeO3 2− reduction. Extracted TeNRs appear to be embedded in an organic surrounding material, as suggested by the chemical–physical characterization. Moreover, we observed longer TeNRs depending on either the concentration of precursor (100 or 500 μg/mL of K2TeO3) or the growth conditions (unconditioned or conditioned grown cells).Conclusions Rhodococcus aetherivorans BCP1 is able to tolerate high concentrations of TeO3 2− during its growth under aerobic conditions. Moreover, compared to unconditioned BCP1 cells, TeO3 2− conditioned cells showed a higher oxyanion consumption rate (for 100 μg/mL of K2TeO3) or to consume greater amount of TeO3 2− (for 500 μg/mL of K2TeO3). TeO3 2− consumption by BCP1 cells led to the production of intracellular and not aggregated TeNRs embedded in an organic surrounding material. The high resistance of BCP1 to TeO3 2− along with its ability to produce Te-nanostructures supports the application of this microorganism as a possible eco-friendly nanofactory.Electronic supplementary materialThe online version of this article (doi:10.1186/s12934-016-0602-8) contains supplementary material, which is available to authorized users.

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“…At the time of writing, there are only three published examples of reductases dedicated to tellurite reduction. The first was found in 2009, when Bacillus sp., STG-83 was isolated from Neidasht spring in Iran, which can reduce increased levels of tellurite (~320 µg/mL) [155]. In this bacterium, the reduction of TeO 3 2− is accomplished by a cytoplasmic enzyme [156].…”

Section: Tellurite Reductasesmentioning

confidence: 99%

Extreme Environments and High-Level Bacterial Tellurite Resistance

Maltman

Yurkov

2019

Microorganisms

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Bacteria have long been known to possess resistance to the highly toxic oxyanion tellurite, most commonly though reduction to elemental tellurium. However, the majority of research has focused on the impact of this compound on microbes, namely E. coli, which have a very low level of resistance. Very little has been done regarding bacteria on the other end of the spectrum, with three to four orders of magnitude greater resistance than E. coli. With more focus on ecologically-friendly methods of pollutant removal, the use of bacteria for tellurite remediation, and possibly recovery, further highlights the importance of better understanding the effect on microbes, and approaches for resistance/reduction. The goal of this review is to compile current research on bacterial tellurite resistance, with a focus on high-level resistance by bacteria inhabiting extreme environments.

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Bioprocessing of seleno-oxyanions and tellurite in a novel Bacillus sp. strain STG-83: A solution to removal of toxic oxyanions in presence of nitrate

Cited by 30 publications

References 48 publications

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

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

Rhodococcus aetherivorans BCP1 as cell factory for the production of intracellular tellurium nanorods under aerobic conditions

Extreme Environments and High-Level Bacterial Tellurite Resistance

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