Biosynthesis and recovery of rod-shaped tellurium nanoparticles and their bactericidal activities

Zare, Bijan; Faramarzi, Mohammad Ali; Sepehrizadeh, Zargham; Shakibaie, Mojtaba; Rezaie, Sassan; Shahverdi, Ahmad Reza

doi:10.1016/j.materresbull.2012.06.034

Cited by 94 publications

(74 citation statements)

References 33 publications

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“…There was no increased removal detected by the QW6 strain at greater concentrations, even after 144 h of incubation. Additionally, an incomplete reduction of TeO 3 2− was described by Zare et al [20] in the case of Bacillus sp. BZ incubated in Nutrient Broth medium supplemented with 50 or 100 µg/mL (0.2 or 0.4 mM) of K 2 TeO 3 within 50 h of exposure.…”

Section: Discussionmentioning

confidence: 83%

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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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Section: Discussionmentioning

confidence: 83%

“…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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“…We decided to test the chemical reactivity of the TeNSs as an antibacterial agent since it was recently shown that chemically synthesized tellurium NSs showed very promising antibacterial properties against E. coli, comparable to or higher than those to silver NSs (14). The same antibacterial properties were then reported using Te nanostructures against S. aureus, P. aeruginosa, Salmonella enterica serovar Typhi, and Klebsiella pneumoniae (37). Moreover, recently an interesting observation was made by Mohanty and colleagues (38), who reported that tellurium nanorods possessed antivirulence properties against P. aeruginosa and were able to effectively inhibit the production of pyoverdine, one of the main virulence factors in this bacterium.…”

Section: Discussionmentioning

confidence: 99%

Glutathione Reductase-Mediated Synthesis of Tellurium-Containing Nanostructures Exhibiting Antibacterial Properties

Pugin

Cornejo

Muñoz-Díaz

et al. 2014

Appl Environ Microbiol

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Tellurium, a metalloid belonging to group 16 of the periodic table, displays very interesting physical and chemical properties and lately has attracted significant attention for its use in nanotechnology. In this context, the use of microorganisms for synthesizing nanostructures emerges as an eco-friendly and exciting approach compared to their chemical synthesis. To generate Tecontaining nanostructures, bacteria enzymatically reduce tellurite to elemental tellurium. In this work, using a classic biochemical approach, we looked for a novel tellurite reductase from the Antarctic bacterium Pseudomonas sp. strain BNF22 and used it to generate tellurium-containing nanostructures. A new tellurite reductase was identified as glutathione reductase, which was subsequently overproduced in Escherichia coli. The characterization of this enzyme showed that it is an NADPH-dependent tellurite reductase, with optimum reducing activity at 30°C and pH 9.0. Finally, the enzyme was able to generate Te-containing nanostructures, about 68 nm in size, which exhibit interesting antibacterial properties against E. coli, with no apparent cytotoxicity against eukaryotic cells.

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“…Interestingly, Te nanoparticles were reported to exhibit higher antibacterial activity and lower toxicity than Ag nanoparticles [51]. Moreover, metal oxide nanomaterials have also shown antimicrobial properties, such as zinc oxide (ZnO), copper oxide (CuO), titanium dioxide (TiO 2 ), aluminum oxide (Al 2 O 3 ),and ceriumoxide (CeO 2 ) [43,47,52].…”

Section: Nanotechnologies In Antimicrobial Treatmentmentioning

confidence: 99%

Nanomedicine in the management of microbial infection – Overview and perspectives

et al. 2014

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For more than 2 billion years, microbes have reigned on our planet, evolving or outlasting many obstacles they have encountered. In the 20th century, this trend took a dramatic turn with the introduction of antibiotics and vaccines. Nevertheless, since then, microbes have progressively eroded the effectiveness of previously successful antibiotics by developing resistance, and many infections have eluded conventional vaccine design approaches. Moreover, the emergence of resistant and more virulent strains of bacteria has outpaced the development of new antibiotics over the last few decades. These trends have had major economic and health impacts at all levels of the socioeconomic spectrum – we need breakthrough innovations that could effectively manage microbial infections and deliver solutions that stand the test of time. The application of nanotechnologies to medicine, or nanomedicine, which has already demonstrated its tremendous impact on the pharmaceutical and biotechnology industries, is rapidly becoming a major driving force behind ongoing changes in the antimicrobial field. Here we provide an overview on the current progress of nanomedicine in the management of microbial infection, including diagnosis, antimicrobial therapy, drug delivery, medical devices, and vaccines, as well as perspectives on the opportunities and challenges in antimicrobial nanomedicine.

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Biosynthesis and recovery of rod-shaped tellurium nanoparticles and their bactericidal activities

Cited by 94 publications

References 33 publications

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

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

Glutathione Reductase-Mediated Synthesis of Tellurium-Containing Nanostructures Exhibiting Antibacterial Properties

Nanomedicine in the management of microbial infection – Overview and perspectives

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