Arsenic biotransformation by <scp><i>S</i></scp><i>treptomyces</i> <scp>sp</scp>. isolated from rice rhizosphere

Kuramata, Masato; Sakakibara, Futa; Kataoka, Ryota; Abe, Tadashi; Asano, Masaharu; Baba, Koji; Takagi, Kazuhiro; Ishikawa, Shinya

doi:10.1111/1462-2920.12572

Cited by 73 publications

(44 citation statements)

References 36 publications

(56 reference statements)

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“…Our results showed the presence of microorganisms already reported as biodegraders of organo-arsenicals, such as Streptomyces and Clostridium (Kuramata et al 2014;Cressman et al 2010). Nocardia has been reported as present in feed chicken manure (Akinde and Obire 2008).…”

Section: Discussionsupporting

confidence: 62%

Biodegradation of roxarsone by a bacterial community of underground water and its toxic impact

Mafla

Moraga

León

et al. 2015

World J Microbiol Biotechnol

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Roxarsone is included in chicken food as anticoccidial and mainly excreted unchanged in faeces. Microorganisms biotransform roxarsone into toxic compounds that leach and contaminate underground waters used for human consumption. This study evaluated roxarsone biotransformation by underground water microorganisms and the toxicity of the resulting compounds. Underground water from an agricultural field was used to prepare microcosms, containing 0.05 mM roxarsone, and cultured under aerobic or anaerobic conditions. Bacterial communities of microcosms were characterized by PCR-DGGE. Roxarsone degradation was measured by HPLC/HG/AAS. Toxicity was evaluated using HUVEC cells and the Toxi-ChromoTest kit. Roxarsone degradation analysis, after 15 days, showed that microcosms of underground water with nutrients degraded 90 and 83.3% of roxarsone under anaerobic and aerobic conditions, respectively. Microcosms without nutrients degraded 50 and 33.1% under anaerobic and aerobic conditions, respectively. Microcosms including nutrients showed more roxarsone conversion into toxic inorganic arsenic species. DGGE analyses showed the presence of Proteobacteria, Firmicutes, Actinobacteria, Planctomycetes and Spirochaetes. Toxicity assays showed that roxarsone biotransformation by underground water microorganisms in all microcosms generated degradation products toxic for eukaryotic and prokaryotic cells. Furthermore, toxicity increased when roxarsone leached though a soil column and was further transformed by the bacterial community present in underground water. Therefore, using underground water from areas where roxarsone containing manure is used as fertilizer might be a health risk.

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Section: Discussionsupporting

confidence: 62%

Biodegradation of roxarsone by a bacterial community of underground water and its toxic impact

Mafla

Moraga

León

et al. 2015

World J Microbiol Biotechnol

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“…The most studied and technologically developed plant growthpromoting microbes mainly include rhizobia and other Gram-negative bacteria. However, besides their widely known ability to produce antibiotics, representatives of the Gram-positive genus Streptomyces have been found in beneficial associations with plants, including those of agronomic importance [64,[142][143][144]. The diversity of bioactive compounds produced by Streptomyces spp.…”

Section: Concluding Remarks and Perspectivesmentioning

confidence: 99%

Plant growth promotion by streptomycetes: ecophysiology, mechanisms and applications

Sousa

Olivares

2016

Chem. Biol. Technol. Agric.

124

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The genus Streptomyces comprises filamentous Gram-positive bacteria that are widely recognized for their ability to produce bioactive compounds such as antimicrobial, antiparasitic and immune-suppressing compounds via secondary metabolism. These bioactive compounds represent a third of all commercially available antibiotics. Streptomycetes have been found in beneficial associations with plants where they have improved plant growth and protected against pests, which have attracted the attention of researchers worldwide. This review focuses on the potential of streptomycetes as plant growth-promoting bacteria (PGPS) and considers features related to secondary metabolic pathways, interactions with host plants and recent advances in elucidating plant growth-promoting mechanisms. Such advances in basic knowledge have increased the prospects for streptomycetes to be used as bioinoculants for sustainable agriculture.

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“…Of the arsenitemethylating bacteria, Rhodopseudomonas palustris (17), Streptomyces sp. strain GSRB54 (18) and Methanosarcina acetivorans C2A (19) have been studied in detail. The enzymes that catalyze As methylation, As(III) S-adenosylmethionine methyltransferases (ArsMs), have been purified and characterized from these bacteria.…”

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confidence: 99%

Arsenic Methylation and Volatilization by Arsenite S -Adenosylmethionine Methyltransferase in Pseudomonas alcaligenes NBRC14159

Zhang

Cao

Tang

et al. 2015

Appl Environ Microbiol

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c Inorganic arsenic (As) is highly toxic and ubiquitous in the environment. Inorganic As can be transformed by microbial methylation, which constitutes an important part of the As biogeochemical cycle. In this study, we investigated As biotransformation by Pseudomonas alcaligenes NBRC14159. P. alcaligenes was able to methylate arsenite [As(III)] rapidly to dimethylarsenate and small amounts of trimethylarsenic oxide. An arsenite S-adenosylmethionine methyltransferase, PaArsM, was identified and functionally characterized. PaArsM shares low similarities with other reported ArsM enzymes (<55%). When P. alcaligenes arsM gene (PaarsM) was disrupted, the mutant lost As methylation ability and became more sensitive to As(III). PaarsM was expressed in the absence of As(III) and the expression was further enhanced by As(III) exposure. Heterologous expression of PaarsM in an As-hypersensitive strain of Escherichia coli conferred As(III) resistance. Purified PaArsM protein methylated As(III) to dimethylarsenate as the main product in the medium and also produced dimethylarsine and trimethylarsine gases. We propose that PaArsM plays a role in As methylation and detoxification of As(III) and could be exploited in bioremediation of As-contaminated environments.

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Arsenic biotransformation by Streptomyces sp. isolated from rice rhizosphere

Cited by 73 publications

References 36 publications

Biodegradation of roxarsone by a bacterial community of underground water and its toxic impact

Biodegradation of roxarsone by a bacterial community of underground water and its toxic impact

Plant growth promotion by streptomycetes: ecophysiology, mechanisms and applications

Arsenic Methylation and Volatilization by Arsenite S -Adenosylmethionine Methyltransferase in Pseudomonas alcaligenes NBRC14159

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