A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Wang, Peipei; Sun, Guoxin; Jia, Yan; Meharg, Andrew A.; Zhu, Yan

doi:10.1016/s1001-0742(13)60432-5

Cited by 144 publications

(60 citation statements)

References 82 publications

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“…In addition, the bioremediation for As-contaminated water or the minimization of As in algal products can be achieved if more iAs in microalgae can be methylated to MMA(V), DMA(V), TMAO and TMA by changing some abiotic factors such as exposure time and As(V)/P ratios (Levy et al 2005;Qin et al 2006;Yin et al 2011b). Nevertheless, the As volatilization process from cells may increase the amounts of As in the atmosphere and should be assessed for its impact on the environment if scientists harness it for bioremediation purposes (Mestrot et al 2013;Wang et al 2014b). …”

Section: Arsenic Methylationmentioning

confidence: 99%

Review of arsenic speciation, toxicity and metabolism in microalgae

Wang

et al. 2015

Rev Environ Sci Biotechnol

162

100

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Arsenic is a toxic metalloid and its pollution has become a global environmental problem. This paper reviewed the current knowledge on the speciation, toxicity and metabolism of arsenic in microalgae. A number of arsenic species are present in various microalgae. Due to the great toxicity of inorganic arsenic, microalgae may undergo different processes to reduce the arsenic toxicity, including cell surface binding, arsenite [As(III)] oxidation, arsenate [As(V)] reduction, methylation, transformation into arsenosugars or arsenolipids, chelation of As(III) with glutathione and phytochelatins, as well as excretion from cells. Several genes and enzymes involved in arsenic transformations have been identified and characterized. Many factors, especially nutrient elements (e.g., nitrogen and phosphorus) in cells and in culture, affect arsenic metabolic pathways of microalgae. Arsenic metabolism in the unicellular algae has gained considerable interest because these processes control not only the effectiveness of arsenic phycoremediation, but also the risk of arsenic contamination in algal products. Future research need to focus on (1) the regulative mechanisms of arsenic absorption, biotransformation and excretion at molecular level; (2) the effects of intracellular nutrient dynamics on arsenic speciation; (3) the impacts of culture regime on the arsenic metabolism in microalgae; (4) the transfer of arsenic species across aquatic food web in order to better evaluate the roles of microalgae in arsenic cycling.

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Section: Arsenic Methylationmentioning

confidence: 99%

Review of arsenic speciation, toxicity and metabolism in microalgae

Wang

et al. 2015

Rev Environ Sci Biotechnol

162

100

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“…As known, soil microorganisms play important roles in As biogeochemistry Wang et al, 2014), while soil contamination with As would greatly influence the biodiversity and function of soil microbial communities (Lorenz et al, 2006), and subsequently lead to a decrease of soil fertility. Arbuscular mycorrhizal fungi (AMF) are ubiquitous soil fungi in natural and agricultural ecosystems, and can form symbiotic associations with the majority of higher plants (Smith and Read, 2008).…”

Section: Introductionmentioning

confidence: 99%

The molecular diversity of arbuscular mycorrhizal fungi in the arsenic mining impacted sites in Hunan Province of China

Sun

Zhang

et al. 2016

Journal of Environmental Sciences

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Arbuscular mycorrhizal fungi (AMF) can establish a mutualistic association with most terrestrial plants even in heavy metal contaminated environments. It has been documented that high concentrations of toxic metals, such as arsenic (As) in soil could adversely affect the diversity and function of AMF. However, there are still gaps in understanding the community composition of AMF under long-term As contaminations. In the present study, six sampling sites with different As concentrations were selected in the Realgar mining area in Hunan Province of China. The AMF biodiversity in the rhizosphere soils of the dominant plant species was investigated by sequencing the nuclear small subunit ribosomal RNA (SSU rRNA) gene fragments using 454-pyrosequencing technique. A total of 11 AMF genera were identified, namely Rhizophagus, Glomus, Funneliformis, Acaulospora, Diversispora, Claroideoglomus, Scutellopora, Gigaspora, Ambispora, Praglomus, and Archaeospora, among which Glomus, Rhizophagus, and Claroideoglomus clarodeum were detected in all sampling sites, and Glomus was the dominant AMF genus in the Realgar mining area. Redundancy analysis indicated that soil pH, total As and Cd concentrations were the main factors influencing AMF community structure. There was a negative correlation between the AMF species richness and the total As concentration in the soil, but no significant correlation between the Shannon-Wiener index of the AMF and plants. Our study showed that high As concentrations can exert a selective effect on the AMF populations.

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“…Arsenite (As(III)) oxidation is believed to be a detoxification pathway since arsenate (As(V)) is less toxic than As(III) (Armendariz et al, 2015;Paez-Espino et al, 2009). Although the possible intermediate products methylarsenite (MMA(III)) and dimethylarsenite (DMA(III)) are more toxic, As methylation is acknowledged as a pathway of detoxification in microbes Wang et al, 2014b). One classical As biomethylation scheme can be summarized as alternating reduction and methylation, producing less toxic methylated arsenicals such as methylarsenate (MMA(V)), dimethylarsenate (DMA(V)), and trimethylarsine oxide (TMAO(V)) (Bentley and Chasteen, 2002;Challenger, 1945).…”

Section: Introductionmentioning

confidence: 99%

Arsenic methylation by an arsenite S-adenosylmethionine methyltransferase from Spirulina platensis

Guo

Xue

Yan

et al. 2016

Journal of Environmental Sciences

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Arsenic-contaminated water is a serious hazard for human health. Plankton plays a critical role in the fate and toxicity of arsenic in water by accumulation and biotransformation.Spirulina platensis (S. platensis), a typical plankton, is often used as a supplement or feed for pharmacy and aquiculture, and may introduce arsenic into the food chain, resulting in a risk to human health. However, there are few studies about how S. platensis biotransforms arsenic. In this study, we investigated arsenic biotransformation by S. platensis. When exposed to arsenite (As(III)), S. platensis accumulated arsenic up to 4.1 mg/kg dry weight.After exposure to As(III), arsenate (As(V)) was the predominant species making up 64% to 86% of the total arsenic. Monomethylarsenate (MMA(V)) and dimethylarsenate (DMA(V)) were also detected. An arsenite S-adenosylmethionine methyltransferase from S. platensis (SpArsM) was identified and characterized. SpArsM showed low identity with other reported ArsM enzymes. The Escherichia coli AW3110 bearing SparsM gene resulted in As(III) methylation and conferring resistance to As(III). The in vitro assay showed that SpArsM exhibited As(III) methylation activity. DMA(V) and a small amount of MMA(V) were detected in the reaction system within 0.5 hr. A truncated SpArsM derivative lacking the last 34 residues still had the ability to methylate As(III). The three single mutants of SpArsM (C59S, C186S, and C238S) abolished the capability of As(III) methylation, suggesting the three cysteine residues are involved in catalysis. We propose that SpArsM is responsible for As methylation and detoxification of As(III) and may contribute to As biogeochemistry.

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A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Cited by 144 publications

References 82 publications

Review of arsenic speciation, toxicity and metabolism in microalgae

Review of arsenic speciation, toxicity and metabolism in microalgae

The molecular diversity of arbuscular mycorrhizal fungi in the arsenic mining impacted sites in Hunan Province of China

Arsenic methylation by an arsenite S-adenosylmethionine methyltransferase from Spirulina platensis

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