Arsenic resistance genes of As‐resistant purple nonsulfur bacteria isolated from As‐contaminated sites for bioremediation application

Nookongbut, Phitthaya; Kantachote, Duangporn; Krishnan, Kannan; Megharaj, Mallavarapu

doi:10.1002/jobm.201600584

Cited by 20 publications

(7 citation statements)

References 46 publications

(47 reference statements)

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“…AAP120 has not been reported, its relative R. palustris C1 was found to reduce As(V), with a specific activity of 12.07 U mg -1 protein, which was comparable to that of the As(V)-reducing bacterium Pseudomonas sp. (12.15 U mg -1 protein) (Srivastava et al, 2010; Nookongbut et al, 2017). Based on the similarity of the proteins in HL18 to proteins with known As(V)-reducing activity, it is very likely that these proteins in HL18 are active as well.…”

Section: Discussionmentioning

confidence: 99%

Metagenomic Evidence for a Methylocystis Species Capable of Bioremediation of Diverse Heavy Metals

Shi

Chen

et al. 2019

Front. Microbiol.

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Heavy metal pollution has become an increasingly serious problem worldwide. Co-contamination with toxic mercury (Hg) and arsenic (As) presents a particularly difficult bioremediation trouble. By oxidizing the greenhouse gas methane, methanotrophs have been demonstrated to have high denitrification activity in eutrophic waters, indicating their possible potential for use in bioremediation of Hg(II) and As(V) in polluted water. Using metagenomics, a novel Methylocystis species (HL18), which was one of the most prevalent bacteria (9.9% of the relative abundance) in a CH4-based bio-reactor, is described here. The metagenomic-assembled genome (MAG) HL18 had gene products whose average amino acid identity against other known Methylocystis species varied from 69 to 85%, higher than the genus threshold but lower than the species boundary. Genomic analysis indicated that HL18 possessed all the genes necessary for the reduction of Hg(II) and As(V). Phylogenetic investigation of mercuric reductase (MerA) found that the HL18 protein was most closely affiliated with proteins from two Hg(II)-reducing bacteria, Bradyrhizobium sp. strain CCH5-F6 and Paracoccus halophilus. The genomic organization and phylogeny of the genes in the As(V)-reducing operon (arsRCCB) had significant identity with those from a As(V)-reducing bacterium belonging to the Rhodopseudomonas genus, indicating their reduction capability of As(V). Further analysis found that at least eight genera of methanotrophs possess both Hg(II) and As(V) reductases, illustrating the generally overlooked metabolic potential of methanotrophs. These results suggest that methanotrophs have greater bioremediation potential in heavy metal contaminated water than has been appreciated and could play an important role in the mitigation of heavy metal toxicity of contaminated wastewater.

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Section: Discussionmentioning

confidence: 99%

Metagenomic Evidence for a Methylocystis Species Capable of Bioremediation of Diverse Heavy Metals

Shi

Chen

et al. 2019

Front. Microbiol.

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“…Moreover, volatile methylated As species such as dimethylarsenic acid [DMA(V)] and MMA(V) were detected with As(III) and As(V). Later, Nookongbut et al ( 2017 ) provided evidence for the presence of several As marker genes, including arsenite transporter ( acr 3), arsenite oxidation ( aio A), arsenate reduction ( ars C), and As methylation ( ars M) in strain C1. Moreover, strain C1 could perform both As(III) oxidation and As(V) reduction under aerobic-dark and anaerobic-light conditions, respectively.…”

Section: Advantages Of Pnsb As Bioremediation Agentsmentioning

confidence: 99%

Anoxygenic phototrophic purple non-sulfur bacteria: tool for bioremediation of hazardous environmental pollutants

Dhar,

Venkateswarlu,

Megharaj

2023

World J Microbiol Biotechnol

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The extraordinary metabolic flexibility of anoxygenic phototrophic purple non-sulfur bacteria (PNSB) has been exploited in the development of various biotechnological applications, such as wastewater treatment, biohydrogen production, improvement of soil fertility and plant growth, and recovery of high-value compounds. These versatile microorganisms can also be employed for the efficient bioremediation of hazardous inorganic and organic pollutants from contaminated environments. Certain members of PNSB, especially strains of Rhodobacter sphaeroides and Rhodopseudomonas palustris, exhibit efficient remediation of several toxic and carcinogenic heavy metals and metalloids, such as arsenic, cadmium, chromium, and lead. PNSB are also known to utilize diverse biomass-derived lignocellulosic organic compounds and xenobiotics. Although biodegradation of some substituted aromatic compounds by PNSB has been established, available information on the involvement of PNSB in the biodegradation of toxic organic pollutants is limited. In this review, we present advancements in the field of PNSB-based bioremediation of heavy metals and organic pollutants. Furthermore, we highlight that the potential role of PNSB as a promising bioremediation tool remains largely unexplored. Thus, this review emphasizes the necessity of investing extensive research efforts in the development of PNSB-based bioremediation technology.

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“…This behavior makes it one of the most versatile microorganisms among the known purple non-sulfur bacteria (PNSB). PNSB play roles in the biochemical cycle of carbon (C), nitrogen (N), phosphorus (P), sulfur (S) and iron (Fe) and are good candidates in the bioremediation and wastes or wastewater treatments [5][6][7][8]. As reported the mixed culture purple phototrophic bacteria are an effective fishmeal replacement in aquaculture [9].…”

Section: Introductionmentioning

confidence: 99%

Ammonium Inhibits Performance of <i>Rhodopseudomonas palustris</i> in Cyanobacterial Substrate

Tian¹,

Donde²,

Tian³

et al. 2020

Pol. J. Environ. Stud.

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Though it is feasible of Rhodopseudomonas palustris (R. palustris) stimulation in the cyanobacterial substrate, less is known about its performance under the high ammonium-nitrogen (NH 4-N) circumstance. In the present study, the performance of grown R. palustris Strain PUF1 under an NH 4-N gradient were investigated. Results showed that both the bacterial density and the pigment synthesis were severely inhibited at an NH 4-N concentration of 6.0 g/L, while the ultrathin structure of survived PUF1 wasn't obviously changed in comparison to NH 4-N concentration ≤3.0 g/L. Noticeably, at an NH 4-N concentration of 3.0 g/L PUF1s recovered its biosynthesis of pigments in a six-day acclimation period. Importantly, the PUF1s thrived in algal substrate under the NH 4-N concentration ≤1.0 g/L with per mL algal substrate 8.96 to 9.88×10 8 colony formation unit (CFU) on day six. Moreover, it was more diverse of the bacterial consortia in the low NH 4-N treatments (≤1.0 g/L) than that of NH 4-N concentration 3.0-6.0 g/L. Additionally, the excess NH 4-N reduced the sequestration of phosphorus by PUF1s from the algal substrate. Based on the above findings, an NH 4-N threshold up to 1.0 g/L was recommended, it herein produces substantial R. palustris biomass and achieves efficient nutrient sequestration from the protein-rich cyanobacterial feedstock.

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Arsenic resistance genes of As‐resistant purple nonsulfur bacteria isolated from As‐contaminated sites for bioremediation application

Cited by 20 publications

References 46 publications

Metagenomic Evidence for a Methylocystis Species Capable of Bioremediation of Diverse Heavy Metals

Metagenomic Evidence for a Methylocystis Species Capable of Bioremediation of Diverse Heavy Metals

Anoxygenic phototrophic purple non-sulfur bacteria: tool for bioremediation of hazardous environmental pollutants

Ammonium Inhibits Performance of <i>Rhodopseudomonas palustris</i> in Cyanobacterial Substrate

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