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Dissolved iron released from nanoscale zero-valent iron (nZVI) activates the defense system in bacterium Pseudomonas putida, leading to high tolerance to oxidative stress

ABSTRACT: Dissolved iron released from nanoscale zero-valent iron (nZVI) activates the defense system in bacterium Pseudomonas putida, leading to high tolerance to oxidative stress

PROVIDER: PRJNA812775 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR18218800.fastq.gz	Fastqsanger.gz
	SRR18218801.fastq.gz	Fastqsanger.gz
	SRR18218802.fastq.gz	Fastqsanger.gz
	SRR18218803.fastq.gz	Fastqsanger.gz
	SRR18218804.fastq.gz	Fastqsanger.gz

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Transcriptomic analysis and cellular responses to nanoscale zero-valent iron in green microalga Raphidocelis subcapitata

Project description:Nanoscale zero valent iron (nZVI) is used to remediate aquifers polluted by organochlorines or heavy metals and was also suggested to eliminate harmful algal blooms. nZVI can therefore affect microorganisms in the vicinity of the application area, including microalgae. However, studies on early transcriptomic effects of microalgae after exposure to nZVI are rare. Here, we described the early physiological and transcriptomic response of the freshwater ecological indicator green microalga, Raphidocelis subcapitata ATCC 22662, to 100 mg/L of reactive nZVI and non-reactive nano-magnetite (nFe3O4). The combined effect of shading and the release of total iron from nZVI posed a short-term inhibition effect leading to 15 % of deformed cells and cytosol leakage, while cells viability increased after 24 h. nZVI triggered a more pronounced transcriptomic response with (7380 differentially expressed genes [DEGs]) compared to nFe3O4 (4601 DEGs) after 1 h. nZVI, but not nFe3O4 increased the expression of genes function in DNA repair and replication, while deactivated carbohydrate-energy metabolisms, mitochondria signaling, and transmembrane ion transport. This study highlights an early fate assessment of algal cells under nZVI and nFe3O4 exposure using next-generation risk assessment methods and will serve as valuable information for safe and sustainable application of nZVI in water remediation.

2023-06-06 | GSE234088 | GEO

Dissolved iron released from nanoscale zero-valent iron (nZVI) activates the defense system in bacterium Pseudomonas putida, leading to high tolerance to oxidative stress

Project description:Objective: We aimed to decipher how the transcriptome of P.putida would regulate in the presence of 100 mg/L nZVI and its surplus iron released from nZVI, (44.5 μg/L of dissolved iron obtained from nZVI suspension over 24 h in environmental-sourced reservoir) using Next-Seq RAN-sequencing on an Illumina Next-Seq platform Results: Transcriptomic analysis revealed more pronounced differentially expressed genes (DEGs) caused by dissolved iron (3,839 DEGs) against nZVI (945 DEGs). Dissolved iron (but not nZVI) triggered mostly hypothetical genes, and genes which dual-regulating the oxidative stress-antioxidant response, carbohydrate metabolism, and energy metabolism, a cascade effect which demands high ATP and NADPH energy fuels, but downregulated genes associated with flagellar assembly and two-component systems. The results compare and deepen our understanding of iron particle and ionic stressors effect which triggered different transcriptomic trajectories on soil bacterium, and uncovers the underlying energy-fueled mechanism to resolve oxidative insults due to the iron-exchanging activity within cells.

2022-03-07 | GSE197899 | GEO

Transcriptomic analysis and cellular responses to nanoscale zero-valent iron in green microalga Raphidocelis subcapitata

Project description:Transcriptomic analysis and cellular responses to nanoscale zero-valent iron in green microalga Raphidocelis subcapitata

| PRJNA980090 | ENA

Generation of zero-valent sulfur from dissimilatory sulfate reduction in sulfate-reducing bacteria

Project description:We report a new DSR pathway that directly generates zero-valent sulfur (ZVS) in phylogenetically diverse SRB.

2023-04-27 | E-MTAB-12239 | biostudies-arrayexpress

Molecular mechanism of zero valent iron-enhanced microbial azo reduction in Shewanella decolorationis S12

Project description:Here, we established a successive Fe0-enhanced microbe system to remove azo dye (a typical organic pollutant) by Shewanella decolorationis S12 (S. decolorationis S12, an effective azo dye degradation bacterium) and examined the gene expression time course (10, 30, 60, and 120 min) in whole genome transcriptional level. Comparing with the treatment without ZVI, approximately 8% genes affiliated with 10 different gene expression profiles in S. decolorationis S12 were significantly changed in 120 min during the ZVI-enhanced microbial azo reduction. Intriguingly, MarR transcriptional factor might play a vital role in regulating ZVI-enhanced azo reduction in the aspect of energy production, iron homeostasis, and detoxification. Further investigation showed that induced [Ni-Fe] H2ase genes (hyaABCDEF) and azoreductase genes (mtrABC-omcA) contributed to ZVI-enhanced energy production, while reduced iron uptake (hmuVCB and feoAB), induced sulfate assimilation (cysPTWA) and cysteine biosynthesis (cysM) related genes were essential to iron homeostasis and detoxification. This study disentangles underlying mechanisms of ZVI-enhanced azo reduction in S. decolorationis S12 and lays a foundation for further optimization of integrated ZVI-microbial system for efficient organic pollution treatment.

2021-10-01 | GSE160493 | GEO

Enhanced Biogas Production from Nanoscale Zero Valent Iron-Amended Anaerobic Bioreactors.

Project description:Addition of nanoscale zero valent iron (NZVI) to anaerobic batch reactors to enhance methanogenic activity is described. Two NZVI systems were tested: a commercially available NZVI (cNZVI) slurry and a freshly synthesized NZVI (sNZVI) suspension that was prepared immediately before addition to the reactors. In both systems, the addition of NZVI increased pH and decreased oxidation/reduction potential compared with unamended control reactors. Biodegradation of a model brewery wastewater was enhanced as indicated by an increase in chemical oxygen demand removal with both sNZVI and cNZVI amendments at all concentrations tested (1.25-5.0 g Fe/L). Methane production increased for all NZVI-amended bioreactors, with a maximum increase of 28% achieved on the addition of 2.5 and 5.0 g/L cNZVI. Addition of bulk zero-valent iron resulted in only a 5% increase in methane, indicating the advantage of using the nanoscale particles. NZVI amendments further improved produced biogas by decreasing the amount of CO2 released from the bioreactor by approximately 58%. Overall, addition of cNZVI proved more beneficial than the sNZVI at equal iron concentrations, due to decreased colloidal stability and larger effective particle size of sNZVI. Although some have reported cytotoxicity of NZVI to anaerobic microorganisms, work presented here suggests that NZVI of a certain particle size and reactivity can serve as an amendment to anaerobic digesters to enhance degradation and increase the value of the produced biogas, yielding a more energy-efficient anaerobic method for wastewater treatment.

| S-EPMC4545702 | biostudies-literature

Polymer coating and microbial community shift regulate nano zero-valent iron aging in soils

Project description:Polymer coating and microbial community shift regulate nano zero-valent iron aging in soils

| PRJEB27806 | ENA

Molecular mechanism of zero valent iron-enhanced microbial azo reduction in Shewanella decolorationis S12

Project description:Molecular mechanism of zero valent iron-enhanced microbial azo reduction in Shewanella decolorationis S12

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Coupled mechanism of enhanced and inhibitory effects of nanoscale zero-valent iron on methane production and antibiotic resistance genes in anaerobic digestion of swine manure

Project description:Coupled mechanism of enhanced and inhibitory effects of nanoscale zero-valent iron on methane production and antibiotic resistance genes in anaerobic digestion of swine manure Raw sequence reads

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Reduction of Fouling of Gravity-Driven Membrane (GDM) by Combined Treatment of Persulfate/Ultraviolet/Nanoscale Zero-Valent Iron and Multiple Dynamic Al-Ti based Floc Layers

Project description:Reduction of Fouling of Gravity-Driven Membrane (GDM) by Combined Treatment of Persulfate/Ultraviolet/Nanoscale Zero-Valent Iron and Multiple Dynamic Al-Ti based Floc Layers Genome sequencing

| PRJNA823517 | ENA

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