Microbial Transformations of Antimony

Liu, Huaqing; Sun, Weimin; Häggblom, Max M.

doi:10.1007/978-3-030-97185-4_9

Cited by 3 publications

(3 citation statements)

References 162 publications

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“…For instance, Sb(V) can be enzymatically reduced by SRB for energy (Wang et al 2013), with the reduced Sb immobilized via antimony sul de formation (Liu et al 2022). Other types of bacteria have been reported for mediating immobilization and removal of Sb, under both aerobic and anaerobic conditions, including those that oxidize the more toxic Sb(III) to the less toxic Sb(V) (Deng et al 2021).…”

Section: Impact Of Bacterial Activity On Metalloids Removalmentioning

confidence: 99%

“…Biological Sb methylation can occur under anoxic conditions as a detoxi cation mechanism and has been observed in various environments, but the molecular mechanism remains poorly understood, and only a few bacterial species with this capability have been identi ed so far (Liu et al 2022). None of the latter genera reported in Liu et al 2022 were identi ed the BRs. Another path to Sb(V) removal is through SRB species (Wang et al, 2013).…”

Section: Impact Of Bacterial Activity On Metalloids Removalmentioning

confidence: 99%

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Semi-passive pilot scale bioreactors metal(loid) removal performance response to seasonal freeze-thaw cycle

Desmau,

Simister,

Baldwin

et al. 2024

Preprint

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Managing mine-contact water effectively and sustainably in (sub)arctic regions is crucial for expanding mining activities. The demand for cost-effective (semi-)passive water treatment that relies on natural chemical and biological processes and can withstand challenging weather conditions is increasing. This study investigated the ability of four pilot-scale bioreactors inoculated with locally sourced bacteria andaffected by a freeze-thaw cycle to effectively remove selenium and antimony. The bioreactors were operated at a Canadian subarctic mine for a year. Two duplicate bioreactors were installed in a heated shed maintained at 5°C over winter, while two other duplicates were installed outdoors and left to freeze. The removal rate of selenium and antimony was monitored weekly, while a genomic characterization of the microbial populations in the bioreactors was performed monthly. The bioreactors successfully removed selenium and antimony over the year, demonstrating their ability to manage freeze-thaw cycles. The overall percentage of selenium and antimony removal was similar in the outside and inside bioreactors, apart from the spring thawing period, when removal in the outdoors bioreactors was slightly lower. The dominant taxonomic groups of microbial populations were similar in all bioreactors, with slight variations observed in their relative abundance over time. The microbial population composition was consistent and re-established quickly after spring thaw in the outside bioreactors. This study demonstrated that the removal capacity of bioreactors inoculated with locally sourced bacteria was not largely affected by a freeze-thaw cycle, highlighting the strength of using local resources to design bioreactors in extreme climatic conditions.

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Section: Impact Of Bacterial Activity On Metalloids Removalmentioning

confidence: 99%

Section: Impact Of Bacterial Activity On Metalloids Removalmentioning

confidence: 99%

Semi-passive pilot scale bioreactors metal(loid) removal performance response to seasonal freeze-thaw cycle

Desmau,

Simister,

Baldwin

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Microbes are the key drivers for Sb redox transformations, catalyzing both Sb(III) oxidation and Sb(V) reduction. − Many bacteria mediate Sb(III) oxidation, either for detoxification or for energy generation. − Generation of energy from Sb(III) oxidation may be coupled to nitrogen fixation . Sb(III) oxidation has been proposed to be a microbial detoxification process that has the potential for Sb remediation .…”

Section: Introductionmentioning

confidence: 99%

Widespread Distribution of the arsO Gene Confers Bacterial Resistance to Environmental Antimony

Tang,

Song,

Chen

et al. 2023

Environ. Sci. Technol.

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Microbial oxidation of environmental antimonite (Sb(III)) to antimonate (Sb(V)) is an antimony (Sb) detoxification mechanism. Ensifer adhaerens ST2, a bacterial isolate from a Sb-contaminated paddy soil, oxidizes Sb(III) to Sb(V) under oxic conditions by an unknown mechanism. Genomic analysis of ST2 reveals a gene of unknown function in an arsenic resistance (ars) operon that we term arsO. The transcription level of arsO was significantly upregulated by the addition of Sb(III). ArsO is predicted to be a flavoprotein monooxygenase but shows low sequence similarity to other flavoprotein monooxygenases. Expression of arsO in the arsenic-hypersensitive Escherichia coli strain AW3110Δars conferred increased resistance to Sb(III) but not arsenite (As(III)) or methylarsenite (MAs(III)). Purified ArsO catalyzes Sb(III) oxidation to Sb(V) with NADPH or NADH as the electron donor but does not oxidize As(III) or MAs(III). The purified enzyme contains flavin adenine dinucleotide (FAD) at a ratio of 0.62 mol of FAD/mol protein, and enzymatic activity was increased by addition of FAD. Bioinformatic analyses show that arsO genes are widely distributed in metagenomes from different environments and are particularly abundant in environments affected by human activities. This study demonstrates that ArsO is an environmental Sb(III) oxidase that plays a significant role in the detoxification of Sb(III).

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Flavobacterium potami sp. nov., a multi-metal resistance genes harbouring bacterium isolated from shallow river silt

Mao

et al. 2022

Antonie van Leeuwenhoek

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Microbial Transformations of Antimony

Cited by 3 publications

References 162 publications

Semi-passive pilot scale bioreactors metal(loid) removal performance response to seasonal freeze-thaw cycle

Semi-passive pilot scale bioreactors metal(loid) removal performance response to seasonal freeze-thaw cycle

Widespread Distribution of the arsO Gene Confers Bacterial Resistance to Environmental Antimony

Flavobacterium potami sp. nov., a multi-metal resistance genes harbouring bacterium isolated from shallow river silt

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