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Cai Y, Chen X, Qi H, Bu F, Shaaban M, Peng QA. Genome analysis of Shewanella putrefaciens 4H revealing the potential mechanisms for the chromium remediation. BMC Genomics 2024; 25:136. [PMID: 38308218 PMCID: PMC10837877 DOI: 10.1186/s12864-024-10031-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 01/19/2024] [Indexed: 02/04/2024] Open
Abstract
Microbial remediation of heavy metal polluted environment is ecofriendly and cost effective. Therefore, in the present study, Shewanella putrefaciens stain 4H was previously isolated by our group from the activated sludge of secondary sedimentation tank in a dyeing wastewater treatment plant. The bacterium was able to reduce chromate effectively. The strains showed significant ability to reduce Cr(VI) in the pH range of 8.0 to 10.0 (optimum pH 9.0) and 25-42 ℃ (optimum 30 ℃) and were able to reduce 300 mg/L of Cr(VI) in 72 h under parthenogenetic anaerobic conditions. In this paper, the complete genome sequence was obtained by Nanopore sequencing technology and analyzed chromium metabolism-related genes by comparative genomics The genomic sequence of S. putrefaciens 4H has a length of 4,631,110 bp with a G + C content of 44.66% and contains 4015 protein-coding genes and 3223, 2414, 2343 genes were correspondingly annotated into the COG, KEGG, and GO databases. The qRT-PCR analysis showed that the expression of chrA, mtrC, and undA genes was up-regulated under Cr(VI) stress. This study explores the Chromium Metabolism-Related Genes of S. putrefaciens 4H and will help to deepen our understanding of the mechanisms of Cr(VI) tolerance and reduction in this strain, thus contributing to the better application of S. putrefaciens 4H in the field of remediation of chromium-contaminated environments.
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Affiliation(s)
- Yajun Cai
- College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China
- Clean Production of Textile Printing and Dyeing Engineering Research Center of Ministry of Education, Wuhan, 430200, China
| | - Xu Chen
- College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China
| | - Hanghang Qi
- College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China
| | - Fantong Bu
- College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China
| | - Muhammad Shaaban
- College of Agriculture, Henan University of Science and Technology, Luoyang, China
| | - Qi-An Peng
- College of Environmental Engineering, Wuhan Textile University, Wuhan, 430200, China.
- Clean Production of Textile Printing and Dyeing Engineering Research Center of Ministry of Education, Wuhan, 430200, China.
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Wu Y, Zhao Y, Jia X, Liu Y, Niu J. Phosphomolybdic acid enhancing hexavalent chromium bio-reduction in long-term operation: Optimal dosage and mechanism analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167328. [PMID: 37751836 DOI: 10.1016/j.scitotenv.2023.167328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/06/2023] [Accepted: 09/22/2023] [Indexed: 09/28/2023]
Abstract
The bio-reduction of Cr(VI) is regarded as a feasible and safe strategy to treat Cr pollution. The optimal concentration of phosphomolybdic acid (PMo12) for Cr(VI) reduction and the catalytic mechanism of electron behavior (electron production, electron transport and electron consumption) were revealed in denitrifying biofilm systems. The results showed that 0.1 mM PMo12 could achieve 92.5 % removal efficiency of 90 mg/L Cr(VI), which was 47.7 % higher than that of PMo12-free system, and improve the extracellular fixation capacity of Cr(III). The activity of peroxidase (POD) was significantly promoted by PMo12 to repair oxidative stress damage caused by Cr(VI) reduction. Additionally, analysis of electron behavior demonstrated that PMo12 could enhance key indicators of electron production, transport and consumption. This led to rapid activation of the electron pathway inhibited by Cr(VI), enabling simultaneous efficient nitrogen removal and Cr(VI) reduction in the biofilm system. This discovery will provide an efficient technique for Cr-containing wastewater treatment.
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Affiliation(s)
- Yichen Wu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Xvlong Jia
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yinuo Liu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Jiaojiao Niu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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Chi Z, Zhang P, Hou L, Li H, Liang S, Song A. Effects of chromate on nitrogen removal and microbial community in two-stage vertical-flow constructed wetlands. CHEMOSPHERE 2023; 345:140556. [PMID: 37890796 DOI: 10.1016/j.chemosphere.2023.140556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 10/23/2023] [Accepted: 10/25/2023] [Indexed: 10/29/2023]
Abstract
Nitrogen and chromium (Cr(VI)) pollution in waterbodies pose great threats to human health, and a cost-effective alternative with Cr(VI) and nitrogen simultaneous removal is still needed. This study investigated the influence of Cr(VI) on nitrogen removal in the two-stage vertical-flow constructed wetlands (TS-VFCWs) along with iron ore and woodchip, and explored relationship between Cr(VI) and nitrogen removal. The results showed that efficient Cr(VI) and nitrogen removal were simultaneously achieved in TS-VFCWs together with iron-ore and woodchip under 2 mg/L-Cr(VI), whereas 10 mg/L-Cr(VI) gave significant and recoverable inhibition of nitrogen removal. Cr(VI) supplementation promoted the beneficiation of Cr(VI)-reducing/resistant bacteria IMCC26207 and Bryobacter on iron-ore. Woodchip enriched Cr(VI)-reducing bacteria Streptomyces and Thiobacillus. XRD and XPS showed that abundant bound-Cr existed in the surface of iron ore and woodchip, and Cr(III) precipitation/oxide was the major product. High abundances of nitrifying and autotrophic/heterotrophic denitrifying bacteria ensured good nitrogen removal at Cr(VI) stress.
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Affiliation(s)
- Zifang Chi
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China
| | - Pengdong Zhang
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China
| | - Lining Hou
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, PR China
| | - Huai Li
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China.
| | - Shen Liang
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China
| | - Aiwen Song
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China
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Fernandez M, Callegari EA, Paez MD, González PS, Agostini E. Proteomic analysis to unravel the biochemical mechanisms triggered by Bacillus toyonensis SFC 500-1E under chromium(VI) and phenol stress. Biometals 2023; 36:1081-1108. [PMID: 37209221 DOI: 10.1007/s10534-023-00506-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/24/2023] [Indexed: 05/22/2023]
Abstract
Bacillus toyonensis SFC 500-1E is a member of the consortium SFC 500-1 able to remove Cr(VI) and simultaneously tolerate high phenol concentrations. In order to elucidate mechanisms utilized by this strain during the bioremediation process, the differential expression pattern of proteins was analyzed when it grew with or without Cr(VI) (10 mg/L) and Cr(VI) + phenol (10 and 300 mg/L), through two complementary proteomic approaches: gel-based (Gel-LC) and gel-free (shotgun) nanoUHPLC-ESI-MS/MS. A total of 400 differentially expressed proteins were identified, out of which 152 proteins were down-regulated under Cr(VI) and 205 up-regulated in the presence of Cr(VI) + phenol, suggesting the extra effort made by the strain to adapt itself and keep growing when phenol was also added. The major metabolic pathways affected include carbohydrate and energetic metabolism, followed by lipid and amino acid metabolism. Particularly interesting were also ABC transporters and the iron-siderophore transporter as well as transcriptional regulators that can bind metals. Stress-associated global response involving the expression of thioredoxins, SOS response, and chaperones appears to be crucial for the survival of this strain under treatment with both contaminants. This research not only provided a deeper understanding of B. toyonensis SFC 500-1E metabolic role in Cr(VI) and phenol bioremediation process but also allowed us to complete an overview of the consortium SFC 500-1 behavior. This may contribute to an improvement in its use as a bioremediation strategy and also provides a baseline for further research.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina.
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Eduardo A Callegari
- Division of Basic Biomedical Sciences Sanford School of Medicine, University of South Dakota, Vermillion, SD, USA
| | - María D Paez
- Division of Basic Biomedical Sciences Sanford School of Medicine, University of South Dakota, Vermillion, SD, USA
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
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Shi L, Liu B, Zhang X, Bu Y, Shen Z, Zou J, Chen Y. Cloning of Nitrate Reductase and Nitrite Reductase Genes and Their Functional Analysis in Regulating Cr(VI) Reduction in Ectomycorrhizal Fungus Pisolithus sp.1. Front Microbiol 2022; 13:926748. [PMID: 35875523 PMCID: PMC9301267 DOI: 10.3389/fmicb.2022.926748] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 05/24/2022] [Indexed: 11/23/2022] Open
Abstract
Assimilatory-type nitrate reductase (NR) and nitrite reductase (NiR) are the key enzymes that involve in nitrate assimilation and nitrogen cycling in microorganisms. NR and NiR with NADH or NADPH and FMN or FAD domains could be coupled to the reduction process of hexavalent chromium [Cr(VI)] in microorganisms. A new assimilatory-type NR gene (named niaD) and a new assimilatory-type NiR gene (named niiA) are cloned, identified, and functionally characterized by 5′ and 3′ RACE, alignment, annotation, phylogenetic tree, and yeast mutant complementation analyses from Pisolithus sp.1, a dominant symbiotic ectomycorrhizal fungi (EMF) that can assist in phytoremediation. Assimilatory-type niaD and niiA were 2,754 bp and 3,468 bp and encode a polypeptide with 917 and 1,155 amino acid residues, respectively. The isoelectric points of NR (Pisolithus sp.1 NR) and NiR (Pisolithus sp.1 NiR) of Pisolithus sp.1 are 6.07 and 6.38, respectively. The calculated molecular mass of Pisolithus sp.1 NR and Pisolithus sp.1 NiR is 102.065 and 126.914 kDa, respectively. Yeast mutant complementation analysis, protein purification, and activities of NR and NiR under Cr treatment suggest that Pisolithus sp.1 NR is a functional NR that mediates Cr(VI) tolerance and reduction. The multiple alignment demonstrates that Pisolithus sp.1 NR is potentially a nicotinamide adenine dinucleotide phosphate-dependent flavin mononucleotide reductase and also Class II chromate reductase. Our results suggest that Pisolithus sp.1 NR plays a key role in Cr(VI) reduction in the EMF Pisolithus sp.1.
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Affiliation(s)
- Liang Shi
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Binhao Liu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Xinzhe Zhang
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Yuan Bu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Zhenguo Shen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
| | - Jianwen Zou
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China
| | - Yahua Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, China
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China
- Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource, Nanjing Agricultural University, Nanjing, China
- National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agricultural University, Nanjing, China
- The Collaborated Laboratory of Plant Molecular Ecology (between College of Life Sciences of Nanjing Agricultural University and Asian Natural Environmental Science Center of the University of Tokyo), Nanjing Agricultural University, Nanjing, China
- *Correspondence: Yahua Chen,
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Zhao Y, Wang Q, Yang Z, Jia X, Cabrera J, Ji M. Bio-capture of Cr(VI) in a denitrification system: Electron competition, long-term performance, and microbial community evolution. JOURNAL OF HAZARDOUS MATERIALS 2022; 432:128697. [PMID: 35334263 DOI: 10.1016/j.jhazmat.2022.128697] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Chromium is widely applied in industries as an important metal resource, but the discharge of Cr(VI) containing wastewater leads to the loss of chromium resources. This study proposed a bio-capture process of chromium in a denitrification system. The bio-capture potentiality was explored by investigating the electron competition between Cr(VI) and nitrogen compounds reduction, the long-term bio-capture performance, and the microbial community evolution. In the competition utilization of electron donors, both NO3--N and NO2--N took precedence over Cr(VI), and NO2--N reduction was proved to be the rate-limiting step. Under the optimum conditions of 20 mg/L NO3--N and 6 h HRT, 99.95% of 30 mg/L Cr(VI) could be reduced, and 220980 μg Cr/g MLSS was captured by the biofilm, which was fixed in intercellular as Cr(III). Microbiological analysis confirmed that the bio-reduction of Cr(VI) and NO3--N was mediated by synergistic interactions of a series of dominant bacteria, including genera Acidovorax, Thermomonas, and Microbacterium, which contained both the denitrification genes (narG, narZ, nxrA, and nirK) and chromate reduction genes (chrA and chrR). This study proved the feasibility of chromium bio-capture in denitrification systems and provided a new perspective for the Cr(VI) pollution treatment.
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Affiliation(s)
- Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Qian Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Zhifan Yang
- Tianjin Municipal Engineering Design & Research Institute Co. Ltd., Tianjin 300380, China
| | - Xulong Jia
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Jonnathan Cabrera
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Min Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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7
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Shi L, Zhao X, Zhong K, Jia Q, Shen Z, Zou J, Chen Y. Physiological mechanism of the response to Cr(VI) in the aerobic denitrifying ectomycorrhizal fungus Pisolithus sp.1. JOURNAL OF HAZARDOUS MATERIALS 2022; 429:128318. [PMID: 35086038 DOI: 10.1016/j.jhazmat.2022.128318] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/04/2022] [Accepted: 01/18/2022] [Indexed: 06/14/2023]
Abstract
Pisolithus sp. 1 (P sp. 1) is an ectomycorrhizal fungus (EMF) with a strong Cr(VI) tolerance and reduction ability. The noninvasive microttest technique (NMT), real-time quantitative PCR (qRT-PCR), and the three-dimensional excitation-emission matrix (3D-EEM) were used to deeply explore the physiological mechanism of the P sp. 1 response to Cr(VI) and investigate the relationship between Cr(VI) reduction and denitrification in P sp. Cr(VI) induced the strongest elevations in nitrate reductase (NR) activity and NO production in the mycelia after treatment with Cr(VI) for 48 h under aerobic conditions. The NR inhibitor tungstate significantly inhibited Cr(VI) reduction, proton efflux and the expression of the NR gene (niaD) and NiR gene (niiA). In addition, NO was generated via NR-regulated denitrification. Combined treatments with Cr(VI) and the NO scavenger carboxy-PTIO (cPTIO) significantly increased O2-, H2O2 and MDA contents and reduced SDH, CAT, GSH, GR and GSNOR activity. Therefore, the NR-driven aerobic denitrifying process requires protons, and the generated NO reduces the oxidative stress effect of Cr(VI) on mycelia by reducing ROS accumulation and lipid peroxidation, enhancing mycelial and CAT activity, and promoting GSH recycling and regeneration. Psp.1 can also secrete humic acid-like and protein-like substances to combine with Cr(III) in a culture system.
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Affiliation(s)
- Liang Shi
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xuan Zhao
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Kecheng Zhong
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Qiyuan Jia
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhenguo Shen
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianwen Zou
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yahua Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China; National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agricultural University, Nanjing 210095, China; The Collaborated Lab. of Plant Molecular Ecology Between College of Life Sciences of Nanjing Agricultural University and Asian Natural Environmental Science Center of the University of Tokyo, Nanjing Agricultural University, Nanjing 210095, China.
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8
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Ri C, Tang J, Liu F, Lyu H, Li F. Enhanced microbial reduction of aqueous hexavalent chromium by Shewanella oneidensis MR-1 with biochar as electron shuttle. J Environ Sci (China) 2022; 113:12-25. [PMID: 34963522 DOI: 10.1016/j.jes.2021.05.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/14/2021] [Accepted: 05/14/2021] [Indexed: 06/14/2023]
Abstract
Biochar, carbonaceous material produced from biomass pyrolysis, has been demonstrated to have electron transfer property (associated with redox active groups and multi condensed aromatic moiety), and to be also involved in biogeochemical redox reactions. In this study, the enhanced removal of Cr(VI) by Shewanella oneidensis MR-1(MR-1) in the presence of biochars with different pyrolysis temperatures (300 to 800 °C) was investigated to understand how biochar interacts with Cr(VI) reducing bacteria under anaerobic condition. The promotion effects of biochar (as high as 1.07~1.47 fold) were discovered in this process, of which the synergistic effect of BMBC700(ball milled biochar) and BMBC800 with MR-1 was noticeable, in contrast, the synergistic effect of BMBCs (300-600 °C) with MR-1 was not recognized. The more enhanced removal effect was observed with the increase of BMBC dosage for BMBC700+MR-1 group. The conductivity and conjugated O-containing functional groups of BMBC700 particles themselves has been proposed to become a dominant factor for the synergistic action with this strain. And, the smallest negative Zeta potential of BMBC700 and BMBC800 is thought to favor decreasing the distance from microbe than other BMBCs. The results are expected to provide some technical considerations and scientific insight for the optimization of bioreduction by useful microbes combining with biochar composites to be newly developed.
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Affiliation(s)
- Cholnam Ri
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; State Academy of Sciences, Institute of Microbiology, Pyongyang, Democratic People's Republic of Korea
| | - Jingchun Tang
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, China; Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
| | - Feng Liu
- Tianjin Eco-Environmental Comprehensive Support Center, Tianjin, 300191, China
| | - Honghong Lyu
- Tianjin Key Laboratory of Clean Energy and pollution control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Fengxiang Li
- College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, China; Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
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9
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Li SW, Wen Y, Leng Y. Transcriptome analysis provides new insights into the tolerance and reduction of Lysinibacillus fusiformis 15-4 to hexavalent chromium. Appl Microbiol Biotechnol 2021; 105:7841-7855. [PMID: 34546405 DOI: 10.1007/s00253-021-11586-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 08/22/2021] [Accepted: 08/26/2021] [Indexed: 12/13/2022]
Abstract
Microbial bioremediation of Cr(VI)-contaminated environments has drawn extensive concern. However, the molecular processes underlying the microbial Cr(VI) tolerance and reduction remain unclear. We isolated a Cr(VI)-reducing Lysinibacillus fusiformis strain 15-4 from soil on the Qinghai-Tibet Plateau. When grown in 1 mM and 2 mM Cr(VI)-containing medium, strain 15-4 could reduce 100% and 93.7% of Cr(VI) to Cr(III) after 36 h and 60 h of incubation, respectively. To know the molecular processes in response to Cr(VI), transcriptome sequencing was carried out using RNA-Seq technology. The results annotated a total of 3913 expressed genes in the strain. One thousand ninety-eight genes (28.1%) were significantly (fold change ≥ 2, false discovery rate ≤ 0.05) expressed in response to Cr(VI), of which 605 (55.1%) were upregulated and 493 (44.9%) were downregulated. The enrichment analysis showed that a total of 630 differentially expressed genes (DEGs) were enriched to 122 KEGG pathways, of which 8 pathways were significantly (p < 0.05) enriched in Cr(VI)-treated sample, including ATP-binding cassette (ABC) transporters (97 DEGs), ribosome (40), sulfur metabolism (16), aminoacyl-tRNA biosynthesis (19), porphyrin metabolism (20), quorum sensing (44), oxidative phosphorylation (17), and histidine metabolism (10), suggesting that these pathways play key roles to cope with Cr(VI) in the strain. The highly upregulated DEGs consisted of 29 oxidoreductase, 18 dehydrogenase, 14 cell redox homeostasis and stress response protein, and 10 DNA damage and repair protein genes. However, seven Na+:H+ antiporter complex-coding DEGs and most of transcriptional regulator-coding DEGs were significantly downregulated in the Cr-treated sample. Many of FMN/NAD(P)H-dependent reductase-encoding genes were greatly induced by Cr, suggesting the involvement of these genes in Cr(VI) reduction in strain 15-4. Sulfur and iron ions as well as the thiol-disulfide exchange reactions might play synergistic roles in Cr reduction.Key points• Lysinibacillus fusiformis 15-4 was able to tolerate and reduce Cr(VI) to Cr(III).• Transcriptome analysis revealed that 1098 DEGs and 8 key KEGG pathways significantly responded to Cr(VI).• Sulfur metabolism, protein biosynthesis, and porphyrin metabolism were the key pathways associated with the survival of strain 15-4 in response to Cr(VI).
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Affiliation(s)
- Shi-Weng Li
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, People's Republic of China. .,School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, People's Republic of China. .,Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, Lanzhou, 730000, People's Republic of China.
| | - Ya Wen
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, People's Republic of China
| | - Yan Leng
- School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, People's Republic of China
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10
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Nolte TM, Vink JPM, De Cooman W, van Zelm R, Elst R, Ryken E, Hendriks AJ. Ammonia and chromate interaction explains unresolved Hyalella azteca mortality in Flanders' sediment bioassays. CHEMOSPHERE 2021; 271:129446. [PMID: 33454661 DOI: 10.1016/j.chemosphere.2020.129446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 12/21/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
Agricultural, industrial and household chemicals are emitted in large rivers along populated areas, transported by water and deposited in sediments, posing (eco)toxicological risks. Sediments have received less attention than surface waters, likely because of the intrinsic complexity of interactions between sediment constituents complicating correct framing of exposures. Sadly, thorough assessment of the in situ behavior of sediment constituents in bioassays is often not practical. Alternatively, we related physicochemical properties of sediments from field testing to results from bioassays. The case study covers Flemish sediment (incl. Scheldt and Meuse) and mortality of Hyalella azteca, a sensitive bio-indicator. Though variable across Flanders' main water bodies, heavy metals and ammoniacal nitrogen dominate the observed toxicity according to toxic unit (TU) assessments. Depending on the water body we explain between 50 and 90% of the variance in the observed H. azteca mortality, substantially more than previous ecotoxicity studies. We attribute the remaining variance to potential incoherently documented biophysicochemical sediment properties and concentrations of non-target biocides, testing conditions/set-ups and/or species variabilities. We discuss the relative influence of heavy metals/metaloxides, nitrogen (e.g. fertilizer), polycyclic aromatics and organochlorides. We highlight both direct and indirect mortality mechanisms. We note potential synergetic mixture effects between ammoniacal nitrogen and chromium. Such synergy may be phenomenological of 'standard' aerobic bioassays, and prove a complementary method alongside the 'acid-volatile sulfide test' to more effectively link concentration to toxicity. Future study ought to include variation in biophysicochemical properties between sampling locations and batch bioassays. Our approach enables water managers to interpret their monitoring data by converting sediment concentrations to H. azteca mortality and prioritize substances that contribute most.
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Affiliation(s)
- Tom M Nolte
- Radboud University Nijmegen, Department of Environmental Science, Institute for Water and Wetland Research, 6500, GL, Nijmegen, the Netherlands.
| | - Jos P M Vink
- Deltares, Unit Soil and Subsurface Systems, PO-box 85467, 3508, AL, Utrecht, the Netherlands
| | - Ward De Cooman
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300, Aalst, Belgium
| | - Rosalie van Zelm
- Radboud University Nijmegen, Department of Environmental Science, Institute for Water and Wetland Research, 6500, GL, Nijmegen, the Netherlands
| | - Raf Elst
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300, Aalst, Belgium
| | - Els Ryken
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300, Aalst, Belgium
| | - A Jan Hendriks
- Radboud University Nijmegen, Department of Environmental Science, Institute for Water and Wetland Research, 6500, GL, Nijmegen, the Netherlands
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11
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Nolte TM, De Cooman W, Vink JPM, Elst R, Ryken E, Ragas AMJ, Hendriks AJ. Bioconcentration of Organotin Cations during Molting Inhibits Heterocypris incongruens Growth. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:14288-14301. [PMID: 33135409 PMCID: PMC7685533 DOI: 10.1021/acs.est.0c02855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 05/10/2023]
Abstract
The densely populated North Sea region encompasses catchments of rivers such as Scheldt and Meuse. Herein, agricultural, industrial, and household chemicals are emitted, transported by water, and deposited in sediments, posing ecological risks. Though sediment monitoring is often costly and time-intensive, modeling its toxicity to biota has received little attention. Due to high complexity of interacting variables that induce overall toxicity, monitoring data only sporadically validates current models. Via a range of concepts, we related bio-physicochemical constituents of sediment in Flanders to results from toxicity bioassays performed on the ostracod Heterocypris incongruens. Depending on the water body, we explain up to 90% of the variance in H. incongruens growth. Though variable across Flanders' main water bodies, organotin cations and ammonia dominate the observed toxicity according to toxic unit (TU) assessments. Approximately 10% relates to testing conditions/setups, species variabilities, incoherently documented pollutant concentrations, and/or bio-physicochemical sediment properties. We elucidated the influence of organotin cations and ammonia relative to other metal(oxides) and biocides. Surprisingly, the tributylin cation appeared ∼1000 times more toxic to H. incongruens as compared to "single-substance" bioassays for similar species. We inferred indirect mixture effects between organotin, ammonia, and phosphate. Via chemical speciation calculations, we observed strong physicochemical and biological interactions between phosphate and organotin cations. These interactions enhance bioconcentration and explain the elevated toxicity of organotin cations. Our study aids water managers and policy makers to interpret monitoring data on a mechanistic basis. As sampled sediments differ, future modeling requires more emphasis on characterizing and parametrizing the interactions between bioassay constituents. We envision that this will aid in bridging the gap between testing in the laboratory and field observations.
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Affiliation(s)
- Tom M. Nolte
- Department of Environmental Science, Institute for Water and Wetland
Research, Radboud University Nijmegen, 6500 GL Nijmegen, the Netherlands
| | - Ward De Cooman
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300 Aalst, Belgium
| | - Jos P. M. Vink
- Unit Soil and Subsurface Systems, Deltares, P. O. Box 85467, 3508 AL Utrecht, the Netherlands
| | - Raf Elst
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300 Aalst, Belgium
| | - Els Ryken
- Flanders Environment Agency (VMM), Dr. De Moorstraat 24-26, B-9300 Aalst, Belgium
| | - Ad M. J. Ragas
- Department of Environmental Science, Institute for Water and Wetland
Research, Radboud University Nijmegen, 6500 GL Nijmegen, the Netherlands
| | - A. Jan. Hendriks
- Department of Environmental Science, Institute for Water and Wetland
Research, Radboud University Nijmegen, 6500 GL Nijmegen, the Netherlands
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12
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An Q, Deng S, Xu J, Nan H, Li Z, Song JL. Simultaneous reduction of nitrate and Cr(VI) by Pseudomonas aeruginosa strain G12 in wastewater. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 191:110001. [PMID: 31812281 DOI: 10.1016/j.ecoenv.2019.110001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 11/20/2019] [Accepted: 11/23/2019] [Indexed: 06/10/2023]
Abstract
The interference of toxic heavy metals in the process of microbial aerobic denitrification is a hot issue in industry wastewater treatment in recent years. In this study, a multifunctional aerobic denitrifying bacterium - Pseudomonas aeruginosa G12 isolated from sewage sludge was used to explore the simultaneous removal ability to NO3--N and Cr(VI) in wastewater by a series of batch experiments. The results showed that G12 could effectively remove NO3--N (500 mg L-1) and Cr(VI) (10 mg L-1) by 98% and 93%, respectively. Meanwhile, the study found that the strain G12 had the potential to adapt to the complex external environment, including different carbon resources, nitrogen sources, and the coexisting heavy metals (Mn2+ and Cu2+). The strain G12 also had the considerable tolerance to initial NO3--N (100-700 mg L-1) and Cr(VI) (1-20 mg L-1) concentrations. The instrument analysis methods-Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD), from the molecular level, further confirmed that the strain G12 could remove NO3--N by aerobic denitrification, and the reduced functional groups (amino group, amide group, hydroxyl group and carboxyl group) on the surface of bacteria could transform Cr(VI) to Cr(III) (mainly CrCl3). This study will offer a promising new microbial resource for nitrogen and Cr(VI) removal in industry wastewater treatment.
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Affiliation(s)
- Qiang An
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China; The Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Chongqing University, Chongqing, 400045, PR China.
| | - Shuman Deng
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Jia Xu
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Hongyan Nan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 2002405, PR China
| | - Zheng Li
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Jia-Li Song
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
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13
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Ma L, Chen N, Feng C, Li M, Gao Y, Hu Y. Coupling enhancement of Chromium(VI) bioreduction in groundwater by phosphorus minerals. CHEMOSPHERE 2020; 240:124896. [PMID: 31563716 DOI: 10.1016/j.chemosphere.2019.124896] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 07/04/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Groundwater contaminated by hexavalent chromium (Cr(VI)) has posed severe threat to the environment and public health. Although heterotrophic bioremediation has been known as an efficient approach, little is explored on mineral nutrient source addition such as phosphorus minerals. In this study, the stabilization and sustainability of phosphorus minerals for providing phosphorus has been investigated, and the enhancement of Cr(VI) removal by mixed bacterial consortium coupled with phosphorus minerals was also observed and further verified, with 1.4-3.9 times K values (first-order) increase under different conditions. We demonstrated that the applied of phosphorus minerals facilitated the reduction of Cr(VI) and the removal of Cr(III), promoted the resistance of Cr(VI) and the generation of antioxidase, and engendered the evolution of microbial community structures and functional genes. These findings provide a new insight for enhancement of Cr(VI)-contaminated groundwater in-situ remediation.
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Affiliation(s)
- Linlin Ma
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Nan Chen
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China.
| | - Chuanping Feng
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Miao Li
- School of Environment, Tsinghua University, Beijing, 100084, PR China
| | - Yu Gao
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
| | - Yutian Hu
- School of Water Resources and Environment, MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing, 100083, PR China
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14
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Shi L, Dong P, Song W, Li C, Lu H, Wen Z, Wang C, Shen Z, Chen Y. Comparative transcriptomic analysis reveals novel insights into the response to Cr(VI) exposure in Cr(VI) tolerant ectomycorrhizal fungi Pisolithus sp. 1 LS-2017. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109935. [PMID: 31740233 DOI: 10.1016/j.ecoenv.2019.109935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/21/2019] [Accepted: 11/08/2019] [Indexed: 06/10/2023]
Abstract
Chromium (Cr) is one of the most toxic heavy metals and a health hazard to millions of people worldwide. Ectomycorrhizal (ECM) fungi can assist plants in phytoremediation of heavy metal contaminated soil. Cr tolerance differs among ECM fungal varieties, but the underlying molecular mechanisms of Cr tolerance in ECM fungi are not clear. This study identified, analysed and compared the Cr(VI)-induced transcriptional changes between Cr(VI)-tolerant strain (Pisolithus sp. 1 LS-2017) and Cr(VI)-sensitive strain (Pisolithus sp. 2 LS-2017) by de novo transcriptomic analysis. The results showed that 93,642 assembled unique transcripts representing the 22,353 (46.76%) unigenes matched the proteins we have known in the Nr database and 47,801 unigenes were got from the Pisolithus spp. For DEGs between the control and 10 mg/L Cr(VI) treatment, cyanoamino acid metabolic, type I diabetes mellitus metabolism, nitrogen metabolism and beta-Alanine metabolism pathways were significantly enriched (p < 0.05) in Pisolithus sp. 1 LS-2017. Two nitrate reductase family genes (nidD, niiA) provide Cr(VI) tolerance for Pisolithus sp. 1 LS-2017 by regulating Cr(VI) reduction. In addition, NO produced by nidD, niiA regulated denitrification can alleviate Cr(VI) induced oxidative stress. In Pisolithus sp. 2 LS-2017, the alcC, aldA and lcf2 gene may alleviate Cr(VI) induced oxidative stress by protecting SH groups and increasing secondary metabolism, reducing detoxify aldehydes to carboxylic acids and producing LCPUFAs respectively; .T gene regulate Cr(VI) induced wound healing by pigmentation and stability of melanin in spore; MKP2 gene accelerate Cr(VI) induced cell death and gpmA gene regulated Cr(VI) induced energy emergency.
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Affiliation(s)
- Liang Shi
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Pengcheng Dong
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Wuyu Song
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Chenxi Li
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Haining Lu
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Zhugui Wen
- Jiangsu Coastal Area Institute of Agricultural Sciences, Yancheng, Jiangsu, 224002, China.
| | - Chunchun Wang
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.
| | - Zhenguo Shen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China; The Collaborated Lab. of Plant Molecular Ecology (between College of Life Sciences of Nanjing Agricultural University and Asian Natural Environmental Science Center of the University of Tokyo), Nanjing Agricultural University, Nanjing, 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource, Nanjing Agiricultural University, Nanjing, Jiangsu, 210095, China; National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agiricultural University, Nanjing, Jiangsu, 210095, China.
| | - Yahua Chen
- College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China; The Collaborated Lab. of Plant Molecular Ecology (between College of Life Sciences of Nanjing Agricultural University and Asian Natural Environmental Science Center of the University of Tokyo), Nanjing Agricultural University, Nanjing, 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource, Nanjing Agiricultural University, Nanjing, Jiangsu, 210095, China; National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agiricultural University, Nanjing, Jiangsu, 210095, China.
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15
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Ceballos E, Margalef-Martí R, Carrey R, Frei R, Otero N, Soler A, Ayora C. Characterisation of the natural attenuation of chromium contamination in the presence of nitrate using isotopic methods. A case study from the Matanza-Riachuelo River basin, Argentina. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 699:134331. [PMID: 31670212 DOI: 10.1016/j.scitotenv.2019.134331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 08/10/2019] [Accepted: 09/05/2019] [Indexed: 06/10/2023]
Abstract
The groundwater contamination by hexavalent chromium (Cr(VI)) in a site of the Matanza-Riachuelo River basin (MRB), Argentina, has been evaluated by determining the processes that control the natural mobility and attenuation of Cr(VI) in the presence of high nitrate (NO3-) contents. The groundwater Cr(VI) concentrations ranged between 1.9E-5 mM and 0.04 mM, while the NO3- concentrations ranged between 0.5 mM and 3.9 mM. In order to evaluate the natural attenuation of Cr(VI) and NO3- in the MRB groundwater, Cr and N isotopes were measured in these contaminants. In addition, laboratory batch experiments were performed to determine the isotope fractionation (ε) during the reduction of Cr(VI) under denitrifying conditions. While the Cr(VI) reduction rate is not affected by the presence of NO3-, the NO3- attenuation is slower in the presence of Cr(VI). Nevertheless, no significant differences on ε values were observed when testing the absence or presence of each contaminant. The ε53Cr determined in the batch experiments describe a two- stage trend, in which Stage I is characterized by ε53Cr ~-1.8‰ and Stage II by ε53Cr ~-0.9‰. The respective ε15NNO3 obtained is -23.9‰ whereas ε18ONO3 amount to -25.7‰. Using these ε values and a Rayleigh fractionation model we estimate that an average of 60% of the original Cr(VI) is removed from the groundwater of the contaminated site. Moreover, the average degree of NO3- attenuation by denitrification is found to be about 20%. This study provides valuable information about the dynamics of a complex system that can serve as a basis for efficient management of contaminated groundwater in the most populated and industrialized basin of Argentina.
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Affiliation(s)
- Elina Ceballos
- Instituto de Hidrología de Llanuras "Dr. Eduardo J. Usunoff", CONICET-UNCPBA-CIC, República de Italia 780, 47 (B7300), Azul, Buenos Aires, Argentina.
| | - Rosanna Margalef-Martí
- Grup MAiMA, SGR Mineralogia Aplicada, Geoquímica i Geomicrobiologia, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, UB, C/Martí i Franquès, s/n, 08028 Barcelona, Spain
| | - Raul Carrey
- Grup MAiMA, SGR Mineralogia Aplicada, Geoquímica i Geomicrobiologia, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, UB, C/Martí i Franquès, s/n, 08028 Barcelona, Spain
| | - Robert Frei
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Neus Otero
- Grup MAiMA, SGR Mineralogia Aplicada, Geoquímica i Geomicrobiologia, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, UB, C/Martí i Franquès, s/n, 08028 Barcelona, Spain; Serra Húnter Fellow, Generalitat de Catalunya, Spain
| | - Albert Soler
- Grup MAiMA, SGR Mineralogia Aplicada, Geoquímica i Geomicrobiologia, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, UB, C/Martí i Franquès, s/n, 08028 Barcelona, Spain
| | - Carlos Ayora
- Department of Geoscience, Institute of Environmental Assessment and Water Research, IDAEA-CSIC, C/Jordi Girona, 18, 08028 Barcelona, Spain
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16
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Shewanella decolorationis LDS1 Chromate Resistance. Appl Environ Microbiol 2019; 85:AEM.00777-19. [PMID: 31300400 DOI: 10.1128/aem.00777-19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/05/2019] [Indexed: 11/20/2022] Open
Abstract
The genus Shewanella is well known for its genetic diversity, its outstanding respiratory capacity, and its high potential for bioremediation. Here, a novel strain isolated from sediments of the Indian Ocean was characterized. A 16S rRNA analysis indicated that it belongs to the species Shewanella decolorationis It was named Shewanella decolorationis LDS1. This strain presented an unusual ability to grow efficiently at temperatures from 24°C to 40°C without apparent modifications of its metabolism, as shown by testing respiratory activities or carbon assimilation, and in a wide range of salt concentrations. Moreover, S. decolorationis LDS1 tolerates high chromate concentrations. Indeed, it was able to grow in the presence of 4 mM chromate at 28°C and 3 mM chromate at 40°C. Interestingly, whatever the temperature, when the culture reached the stationary phase, the strain reduced the chromate present in the growth medium. In addition, S. decolorationis LDS1 degrades different toxic dyes, including anthraquinone, triarylmethane, and azo dyes. Thus, compared to Shewanella oneidensis, this strain presented better capacity to cope with various abiotic stresses, particularly at high temperatures. The analysis of genome sequence preliminary data indicated that, in contrast to S. oneidensis and S. decolorationis S12, S. decolorationis LDS1 possesses the phosphorothioate modification machinery that has been described as participating in survival against various abiotic stresses by protecting DNA. We demonstrate that its heterologous production in S. oneidensis allows it to resist higher concentrations of chromate.IMPORTANCE Shewanella species have long been described as interesting microorganisms in regard to their ability to reduce many organic and inorganic compounds, including metals. However, members of the Shewanella genus are often depicted as cold-water microorganisms, although their optimal growth temperature usually ranges from 25 to 28°C under laboratory growth conditions. Shewanella decolorationis LDS1 is highly attractive, since its metabolism allows it to develop efficiently at temperatures from 24 to 40°C, conserving its ability to respire alternative substrates and to reduce toxic compounds such as chromate or toxic dyes. Our results clearly indicate that this novel strain has the potential to be a powerful tool for bioremediation and unveil one of the mechanisms involved in its chromate resistance.
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17
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Huang XN, Min D, Liu DF, Cheng L, Qian C, Li WW, Yu HQ. Formation mechanism of organo-chromium (III) complexes from bioreduction of chromium (VI) by Aeromonas hydrophila. ENVIRONMENT INTERNATIONAL 2019; 129:86-94. [PMID: 31121519 DOI: 10.1016/j.envint.2019.05.016] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/06/2019] [Accepted: 05/07/2019] [Indexed: 06/09/2023]
Abstract
Chromium is a common heavy metal widely present in aquatic environments. Cost-effective remediation of chromium-contaminated environment can be realized by microbial reduction of Cr(VI) to Cr(III). The genus Aeromonas species is one of such Cr(VI) reducers, whose reduction mechanism remains unrevealed and the main factors governing the Cr(VI) reduction pathways are unknown yet. In this work, the performances and mechanisms of Cr(VI) anaerobic reduction by Aeromonas hydrophila ATCC 7966 were investigated. This strain exhibited excellent Cr(VI) resistance and could utilize a suite of electron donors to support Cr(VI) bioreduction. The Cr(VI) bioreduction processes involved both extracellular (the metal-reducing and respiratory pathway) and intracellular reaction pathways. Adding anthraquinone-2,6-disulfonate or humic acid as a mediator substantially enhanced the Cr(VI) bioreduction. The forms and distribution of the Cr(VI) bioreduction products were affected by the medium composition. Soluble organo-Cr(III) complexes were identified as the main Cr(VI) reduction products when basal salts medium was adopted. Given the environmental ubiquity of the genus Aeromonas, the findings in this work may facilitate a better understanding about the transformation behaviors and fates of Cr(VI) in environments and provide useful clues to tune the bioremediation of chromium-contaminated environments.
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Affiliation(s)
- Xue-Na Huang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Di Min
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Dong-Feng Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China.
| | - Lei Cheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Chen Qian
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Wen-Wei Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China.
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18
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Chen G, Han J, Mu Y, Yu H, Qin L. Two-stage chromium isotope fractionation during microbial Cr(VI) reduction. WATER RESEARCH 2019; 148:10-18. [PMID: 30343194 DOI: 10.1016/j.watres.2018.09.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 09/17/2018] [Accepted: 09/18/2018] [Indexed: 06/08/2023]
Abstract
Chromium isotope fractionation analysis is a promising approach for the assessment of microbial Cr(VI) reduction in groundwater. Understanding the mechanisms and other parameters that control Cr isotope fractionation factors (between the product Cr(III) and reactant Cr (VI)) in microbial Cr(VI) reduction is critical to this application. To date, such studies are very limited. Here, the influence of critical factors on observed Cr isotope fractionation during Cr(VI) reduction by Shewanella oneidensis MR-1 under various conditions was investigated. The Cr(VI) concentration and Cr isotope ratio measurements were conducted on unreacted Cr(VI) remaining in solution to determine Cr isotope fractionation factors. The changes in ambient environmental conditions (e.g., pH, temperature) have limited influence on Cr isotope fractionation factors. However, as a result of Cr(VI) consumption as the experiments proceed, the change in bioavailability of Cr(VI) has a significant impact on Cr isotope fractionation factors. For example, in temperature-controlled experiments, Cr isotope fractionation showed two-stage behavior: during Stage I, the values of ε were -2.81 ± 0.19‰ and -2.60 ± 0.14‰ at 18 °C and 34 °C, respectively; during Stage II, as Cr(VI) reduction progressed, Cr isotope fractionation was significantly masked, and the ε values decreased to -0.98 ± 0.49‰ and -1.01 ± 0.11‰ at 18 °C and 34 °C, respectively. Similar two-stage isotope fractionation behaviors were observed in pH-controlled experiments (pH = 6.0 and 7.2) and in experiments with and without the addition of a competing electron acceptor (nitrate). Masking of isotope fractionation in Stage II indicated restrictions on the bioavailability of Cr(VI) and mass-transfer limitations. This study provides an explanation for the variation in Cr isotope fractionation factors during microbial Cr(VI) reduction in the environment, furthering the viability of Cr isotope ratio analysis as an approach in understanding Cr biogeochemical cycling.
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Affiliation(s)
- Guojun Chen
- CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
| | - Juncheng Han
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Yang Mu
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Huimin Yu
- CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
| | - Liping Qin
- CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; State Key Laboratory of Geological Processes and Mineral Resources, University of Geosciences, Beijing, China.
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19
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Bai YN, Lu YZ, Shen N, Lau TC, Zeng RJ. Investigation of Cr(VI) reduction potential and mechanism by Caldicellulosiruptor saccharolyticus under glucose fermentation condition. JOURNAL OF HAZARDOUS MATERIALS 2018; 344:585-592. [PMID: 29102641 DOI: 10.1016/j.jhazmat.2017.10.059] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 10/25/2017] [Accepted: 10/28/2017] [Indexed: 06/07/2023]
Abstract
This study examined the microbial reduction of hexavalent chromium [Cr(VI)] by an extremely thermophilic bacterium, Caldicellulosiruptor saccharolyticus, under glucose fermentation conditions at 70°C. Experimentation with different initial Cr(VI) concentrations confirmed that C. saccharolyticus had the ability to reduce Cr(VI) and immobilize Cr(III). At a concentration of 40mg/L, Cr(VI) was completely reduced within 12h, and 97% of the reduction product Cr(III) precipitated on the cell surface. Cr(VI) reduction was accelerated by the addition of neutral red (NR, an electron mediator), resulting in the reduction time shortened to 1h. The addition of CuCl2, a Ni-Fe hydrogenase inhibitor, also enhanced Cr(VI) reduction. Additionally, analysis of the relationship between Cr(VI) reduction and glucose fermentation suggested that different electron sources acted during CuCl2 and NR conditions. Hydrogen served as an electron donor under normal fermentation and NR conditions with the catalysis of Ni-Fe hydrogenase. However, when the activity of Ni-Fe hydrogenase was inhibited by CuCl2, C. saccharolyticus directly used reduction equivalents during glucose fermentation for intracellular Cr(VI) reduction. Therefore, our findings demonstrated high Cr(VI) reduction ability and different electron transfer pathways during Cr(VI) reduction by C. saccharolyticus.
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Affiliation(s)
- Ya-Nan Bai
- Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China; School of Life Sciences, University of Science and Technology of China, Hefei 230026, PR China
| | - Yong-Ze Lu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Nan Shen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China
| | - Tai-Chu Lau
- Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China; State Key Laboratory in Marine Pollution, Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong
| | - Raymond Jianxiong Zeng
- Advanced Laboratory for Environmental Research and Technology, USTC-CityU, Suzhou, PR China; School of Life Sciences, University of Science and Technology of China, Hefei 230026, PR China; CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China.
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20
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Franco LC, Steinbeisser S, Zane GM, Wall JD, Fields MW. Cr(VI) reduction and physiological toxicity are impacted by resource ratio in Desulfovibrio vulgaris. Appl Microbiol Biotechnol 2018; 102:2839-2850. [PMID: 29429007 PMCID: PMC5847207 DOI: 10.1007/s00253-017-8724-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 12/11/2017] [Accepted: 12/18/2017] [Indexed: 11/30/2022]
Abstract
Desulfovibrio spp. are capable of heavy metal reduction and are well-studied systems for understanding metal fate and transport in anaerobic environments. Desulfovibrio vulgaris Hildenborough was grown under environmentally relevant conditions (i.e., temperature, nutrient limitation) to elucidate the impacts on Cr(VI) reduction on cellular physiology. Growth at 20 °C was slower than 30 °C and the presence of 50 μM Cr(VI) caused extended lag times for all conditions, but once growth resumed the growth rate was similar to that without Cr(VI). Cr(VI) reduction rates were greatly diminished at 20 °C for both 50 and 100 μM Cr(VI), particularly for the electron acceptor limited (EAL) condition in which Cr(VI) reduction was much slower, the growth lag much longer (200 h), and viability decreased compared to balanced (BAL) and electron donor limited (EDL) conditions. When sulfate levels were increased in the presence of Cr(VI), cellular responses improved via a shorter lag time to growth. Similar results were observed between the different resource (donor/acceptor) ratio conditions when the sulfate levels were normalized (10 mM), and these results indicated that resource ratio (donor/acceptor) impacted D. vulgaris response to Cr(VI) and not merely sulfate limitation. The results suggest that temperature and resource ratios greatly impacted the extent of Cr(VI) toxicity, Cr(VI) reduction, and the subsequent cellular health via Cr(VI) influx and overall metabolic rate. The results also emphasized the need to perform experiments at lower temperatures with nutrient limitation to make accurate predictions of heavy metal reduction rates as well as physiological states in the environment.
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Affiliation(s)
- Lauren C Franco
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA.,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA
| | - Sadie Steinbeisser
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA.,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA
| | - Grant M Zane
- Departments of Biochemistry and Molecular Microbiology and Immunology, University of Missouri-Columbia, Columbia, MO, USA
| | - Judy D Wall
- Departments of Biochemistry and Molecular Microbiology and Immunology, University of Missouri-Columbia, Columbia, MO, USA.,ENIGMA, Berkeley, CA, USA
| | - Matthew W Fields
- Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA. .,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA. .,ENIGMA, Berkeley, CA, USA, .
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21
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Baaziz H, Gambari C, Boyeldieu A, Ali Chaouche A, Alatou R, Méjean V, Jourlin-Castelli C, Fons M. ChrASO, the chromate efflux pump of Shewanella oneidensis, improves chromate survival and reduction. PLoS One 2017; 12:e0188516. [PMID: 29166414 PMCID: PMC5699817 DOI: 10.1371/journal.pone.0188516] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 11/08/2017] [Indexed: 01/22/2023] Open
Abstract
The chromate efflux pump encoding gene chrASO was identified on the chromosome of Shewanella oneidensis MR1. Although chrASO is expressed without chromate, its expression level increases when Cr(VI) is added. When deleted, the resulting mutant ΔchrASO exhibits a chromate sensitive phenotype compared to that of the wild-type strain. Interestingly, heterologous expression of chrASO in E. coli confers resistance to high chromate concentration. Moreover, expression of chrASO in S. oneidensis and E. coli significantly improves Cr(VI) reduction. This effect could result either from extracytoplasmic chromate reduction or from a better cell survival leading to enhanced Cr(VI) reduction.
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Affiliation(s)
- Hiba Baaziz
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
- Laboratoire de Biologie Moléculaire et Cellulaire, Université des Frères Mentouri Constantine 1, Constantine, Algeria
| | - Cyril Gambari
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Anne Boyeldieu
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Amine Ali Chaouche
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Radia Alatou
- Laboratoire de Biologie Moléculaire et Cellulaire, Université des Frères Mentouri Constantine 1, Constantine, Algeria
| | - Vincent Méjean
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Cécile Jourlin-Castelli
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Michel Fons
- Unité de Bioénergétique et Ingénierie des Protéines, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
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22
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Zhong L, Lai CY, Shi LD, Wang KD, Dai YJ, Liu YW, Ma F, Rittmann BE, Zheng P, Zhao HP. Nitrate effects on chromate reduction in a methane-based biofilm. WATER RESEARCH 2017; 115:130-137. [PMID: 28273443 DOI: 10.1016/j.watres.2017.03.003] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 02/27/2017] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
The effects of nitrate (NO3-) on chromate (Cr(VI)) reduction in a membrane biofilm reactor (MBfR) were studied when CH4 was the sole electron donor supplied with a non-limiting delivery capacity. A high surface loading of NO3- gave significant and irreversible inhibition of Cr(VI) reduction. At a surface loading of 500 mg Cr/m2-d, the Cr(VI)-removal percentage was 100% when NO3- was absent (Stage 1), but was dramatically lowered to < 25% with introduction of 280 mg N m-2-d NO3- (Stage 2). After ∼50 days operation in Stage 2, the Cr(VI) reduction recovered to only ∼70% in Stage 3, when NO3- was removed from the influent; thus, NO3- had a significant long-term inhibition effect on Cr(VI) reduction. Weighted PCoA and UniFrac analyses proved that the introduction of NO3- had a strong impact on the microbial community in the biofilms, and the changes possibly were linked to the irreversible inhibition of Cr(VI) reduction. For example, Meiothermus, the main genus involved in Cr(VI) reduction at first, declined with introduction of NO3-. The denitrifier Chitinophagaceae was enriched after the addition of NO3-, while Pelomonas became important when nitrate was removed, suggesting its potential role as a Cr(VI) reducer. Moreover, introducing NO3- led to a decrease in the number of genes predicted (by PICRUSt) to be related to chromate reduction, but genes predicted to be related to denitrification, methane oxidation, and fermentation increased.
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Affiliation(s)
- Liang Zhong
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Chun-Yu Lai
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China; Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ling-Dong Shi
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Kai-Di Wang
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Yu-Jie Dai
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Yao-Wei Liu
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, P.O. Box 875701, Tempe, AZ 85287-5701, USA
| | - Ping Zheng
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China; Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University, Hangzhou, Zhejiang, China
| | - He-Ping Zhao
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou, China; Zhejiang Province Key Lab Water Pollut Control & Envi, Zhejiang University, Hangzhou, Zhejiang, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
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23
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Yu X, Jiang Y, Huang H, Shi J, Wu K, Zhang P, Lv J, Li H, He H, Liu P, Li X. Simultaneous aerobic denitrification and Cr(VI) reduction by Pseudomonas brassicacearum LZ-4 in wastewater. BIORESOURCE TECHNOLOGY 2016; 221:121-129. [PMID: 27639231 DOI: 10.1016/j.biortech.2016.09.037] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 09/07/2016] [Accepted: 09/08/2016] [Indexed: 06/06/2023]
Abstract
Inorganic nitrogen and heavy metals pervasively co-exist in industrial and domestic wastewaters. In this work, Pseudomonas brassicacearum LZ-4 was tested for the simultaneous reduction of Cr(VI) and nitrate. Nitrate was found to be the best inorganic nitrogen source for strain LZ-4, and could promote Cr(VI) reduction. Cr(VI) had a low degree of inhibition on denitrification, and even 50mgL-1 Cr(VI) did not inhibit reduction of 100mgL-1 NO3--N. The capability of simultaneous reduction of Cr(VI) and nitrate was illustrated by the reductase genes contained in the LZ-4 genome. Application in a batch membrane bioreactor showed that the immobilized strain LZ-4 could remove over 95% of 500mgL-1 NO3--N, 80% of 10mgL-1 Cr(VI), and 96% of 5000mgL-1 COD in each batch of 46days. In summary, the strain LZ-4 is an ideal candidate for remediation of co-contaminants.
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Affiliation(s)
- Xuan Yu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China; Gansu Academy of Membrane Science and Technology, Duanjiatanlu #1272, Lanzhou, Gansu 730020, PR China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China
| | - Yiming Jiang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China
| | - Haiying Huang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China
| | - Juanjuan Shi
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China
| | - Kejia Wu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China
| | - Pengyun Zhang
- Gansu Academy of Membrane Science and Technology, Duanjiatanlu #1272, Lanzhou, Gansu 730020, PR China
| | - Jianguo Lv
- Gansu Academy of Membrane Science and Technology, Duanjiatanlu #1272, Lanzhou, Gansu 730020, PR China
| | - Hongli Li
- PetroChina Lanzhou Petrochemical Company, Yumenjie #10, Lanzhou, Gansu 730060, PR China
| | - Huan He
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China
| | - Pu Liu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China
| | - Xiangkai Li
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Tianshuinanlu #222, Lanzhou, Gansu 730000, PR China.
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24
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Sheng A, Liu F, Shi L, Liu J. Aggregation Kinetics of Hematite Particles in the Presence of Outer Membrane Cytochrome OmcA of Shewanella oneidenesis MR-1. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:11016-11024. [PMID: 27648604 DOI: 10.1021/acs.est.6b02963] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The aggregation behavior of 9, 36, and 112 nm hematite particles was studied in the presence of OmcA, a bacterial extracellular protein, in aqueous dispersions at pH 5.7 through time-resolved dynamic light scattering, electrophoretic mobility, and circular dichroism spectra, respectively. At low salt concentration, the attachment efficiencies of hematite particles in all sizes first increased, then decreased, and finally remained stable with the increase of OmcA concentration, indicating the dominant interparticle interaction changed along with the increase in the protein-to-particle ratio. Nevertheless, at high salt concentration, the attachment efficiencies of all hematite samples gradually decreased with increasing OmcA concentration, which can be attributed to increasing steric force. Additionally, the aggregation behavior of OmcA-hematite conjugates was more correlated to total particle-surface area than primary particle size. It was further established that OmcA could stabilize hematite nanoparticles more efficiently than bovine serum albumin (BSA), a model plasma protein, due to the higher affinity of OmcA to hematite surface. This study highlighted the effects of particle properties, solution conditions, and protein properties on the complicated aggregation behavior of protein-nanoparticle conjugates in aqueous environments.
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Affiliation(s)
- Anxu Sheng
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University , Beijing 100871, P. R. China
| | - Feng Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University , Beijing 100871, P. R. China
| | - Liang Shi
- Department of Biological Sciences and Technology, School of Environmental Studies, China University of Geoscience in Wuhan , Wuhan, Hubei 430074, China
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Juan Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University , Beijing 100871, P. R. China
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25
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Cr(VI) removal from aqueous solution by thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1 in the presence of single and multiple heavy metals. J Microbiol 2016; 54:602-610. [DOI: 10.1007/s12275-016-5295-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 07/22/2016] [Accepted: 07/26/2016] [Indexed: 11/25/2022]
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26
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Yang N, Cui J, Zhang L, Xiao W, Alshawabkeh AN, Mao X. Iron electrolysis-assisted peroxymonosulfate chemical oxidation for the remediation of chlorophenol-contaminated groundwater. JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY (OXFORD, OXFORDSHIRE : 1986) 2016; 91:938-947. [PMID: 30473593 PMCID: PMC6247945 DOI: 10.1002/jctb.4659] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 01/29/2015] [Indexed: 05/23/2023]
Abstract
BACKGROUND Electrolysis with an iron anode is a novel way to provide ferrous activators for chemical oxidation. The objective of this study is to evaluate the performance of peroxymonosulfate (PMS) for chlorophenol destruction when compared with H2O2 and persulfate (PS), and to see whether the electrolysis mode facilitates the buildup of conditions that favor the activation of PMS and removal of chlorophenols. RESULTS Ferrous species can effectively activate the PMS over a wide pH range. In comparison with H2O2 and PS, PMS is less sensitive to the solution's pH and possesses stronger oxidation capability at alkaline pHs. The optimal molar ratio of PMS to Fe(II) activator is 1:1 for the destruction of 2,4-dichlorophenol (2,4-DCP). The column experiments show that an acidic zone developed downstream from the anode is favorable to maintain ferrous ions and subsequent activation of PMS. The reactivity of the PMS can be manipulated by varying the electrical currents, and the process demonstrates effectiveness for treating organic contaminants. 2,4-DCP contaminated groundwater shows decreased biotoxicity after the chemical oxidation process without considering the residual PMS. CONCLUSIONS Iron electrolysis-assisted peroxymonosulfate chemical oxidation can effectively treat the 2,4-dichlorophenol and mixtures of organic contaminants. This process can be engineered as an in situ chemical oxidation method for groundwater remediation.
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Affiliation(s)
- Nuo Yang
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Jiaxin Cui
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Lieyu Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Wei Xiao
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
| | - Akram N. Alshawabkeh
- Civil and environmental engineering Department, Northeastern University, Boston, MA, 02115, USA
| | - Xuhui Mao
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
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27
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Bhattacharya P, Barnebey A, Zemla M, Goodwin L, Auer M, Yannone SM. Complete genome sequence of the chromate-reducing bacterium Thermoanaerobacter thermohydrosulfuricus strain BSB-33. Stand Genomic Sci 2015; 10:74. [PMID: 26445627 PMCID: PMC4595116 DOI: 10.1186/s40793-015-0028-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 05/29/2015] [Indexed: 11/10/2022] Open
Abstract
Thermoanaerobacter thermohydrosulfuricus BSB-33 is a thermophilic gram positive obligate anaerobe isolated from a hot spring in West Bengal, India. Unlike other T. thermohydrosulfuricus strains, BSB-33 is able to anaerobically reduce Fe(III) and Cr(VI) optimally at 60 °C. BSB-33 is the first Cr(VI) reducing T. thermohydrosulfuricus genome sequenced and of particular interest for bioremediation of environmental chromium contaminations. Here we discuss features of T. thermohydrosulfuricus BSB-33 and the unique genetic elements that may account for the peculiar metal reducing properties of this organism. The T. thermohydrosulfuricus BSB-33 genome comprises 2597606 bp encoding 2581 protein genes, 12 rRNA, 193 pseudogenes and has a G + C content of 34.20 %. Putative chromate reductases were identified by comparative analyses with other Thermoanaerobacter and chromate-reducing bacteria.
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Affiliation(s)
- Pamela Bhattacharya
- Life Sciences Division, Lawrence Berkeley National Laboratory, Building 84, Mail Stop 84-171, 1 Cyclotron Road, Berkeley, CA 94720 USA
| | - Adam Barnebey
- Life Sciences Division, Lawrence Berkeley National Laboratory, Building 84, Mail Stop 84-171, 1 Cyclotron Road, Berkeley, CA 94720 USA
| | - Marcin Zemla
- Life Sciences Division, Lawrence Berkeley National Laboratory, Building 84, Mail Stop 84-171, 1 Cyclotron Road, Berkeley, CA 94720 USA
| | - Lynne Goodwin
- Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM USA
| | - Manfred Auer
- Life Sciences Division, Lawrence Berkeley National Laboratory, Building 84, Mail Stop 84-171, 1 Cyclotron Road, Berkeley, CA 94720 USA
| | - Steven M Yannone
- Life Sciences Division, Lawrence Berkeley National Laboratory, Building 84, Mail Stop 84-171, 1 Cyclotron Road, Berkeley, CA 94720 USA
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28
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He D, Zheng M, Ma T, Li C, Ni J. Interaction of Cr(VI) reduction and denitrification by strain Pseudomonas aeruginosa PCN-2 under aerobic conditions. BIORESOURCE TECHNOLOGY 2015; 185:346-352. [PMID: 25795449 DOI: 10.1016/j.biortech.2015.02.109] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Revised: 02/23/2015] [Accepted: 02/27/2015] [Indexed: 06/04/2023]
Abstract
Inhibition of efficient denitrification in presence of toxic heavy metals is one of the current problems encountered in municipal wastewater treatment plants. This paper presents how to remove hexavalent chromium (Cr(VI)) and nitrate simultaneously by the novel strain Pseudomonas aeruginosa PCN-2 under aerobic conditions. The capability of strain PCN-2 for Cr(VI) and nitrate reduction was confirmed by PCR analysis of gene ChrR, napA, nirS, cnorB, nosZ, while Cr(VI) reduction was proved via an initial single-electron transfer through Cr(V) detection using electron paramagnetic resonance. Experimental results demonstrated that Cr(VI) and nitrate reduction by strain PCN-2 was much faster at pH 8-9 and higher initial cell concentration. However, increasing Cr(VI) concentration would inhibit aerobic denitrification process and result in an significant delay of nitrate reduction or N2O accumulation, which was attributed to competition between three electron acceptors, i.e., Cr(VI), O2 and nitrate in the electron transport chain.
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Affiliation(s)
- Da He
- Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Maosheng Zheng
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Tao Ma
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Can Li
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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29
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He D, Zheng M, Ma T, Ni J. Nitrite interference and elimination in diphenylcarbazide (DPCI) spectrophotometric determination of hexavalent chromium. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2015; 72:223-229. [PMID: 26177404 DOI: 10.2166/wst.2015.203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Cr(VI) is highly noted as a carcinogenic, mutagenic, and teratogenic pollutant. However, accurate determination of Cr(VI) in aqueous samples is difficult using the conventional diphenylcarbazide (DPCI) spectrophotometric method upon being interfered by co-existed nitrite. This paper illustrates how to eliminate the nitrite influence in a simple but efficient method based on a detailed analysis of interference mechanism. High-performance liquid chromatography analysis revealed that under acidic condition, DPCI was oxidized by nitrite to other substrates, which could not react with Cr(VI). The final oxidation product of DPCI was further purified by thin-layer chromatography and identified as diaryl carbodiazone by Fourier Transform Ion Cyclotron Resonance-Mass Spectrometry (FTICR-MS) and nuclear magnetic resonance. Consequently, an improved method was proposed by simply adding sulfamic acid for eliminating the nitrite interference in Cr(VI) determination. The proposed method was successfully confirmed by the accurate recovery of Cr(VI) from spiked water samples and further proven with inductively coupled plasma-atomic emission spectroscopy, which demonstrated a great potential for determining Cr(VI) concentration in aqueous samples containing nitrite.
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Affiliation(s)
- Da He
- Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China E-mail: ;
| | - Maosheng Zheng
- Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China E-mail: ;
| | - Tao Ma
- Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China E-mail: ;
| | - Jinren Ni
- Department of Environmental Engineering, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Peking University, Beijing 100871, China E-mail: ;
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30
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Bolan NS, Choppala G, Kunhikrishnan A, Park J, Naidu R. Microbial transformation of trace elements in soils in relation to bioavailability and remediation. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2013; 225:1-56. [PMID: 23494555 DOI: 10.1007/978-1-4614-6470-9_1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Nanthi S Bolan
- Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes, SA, Australia,
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31
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Chovanec P, Sparacino-Watkins C, Zhang N, Basu P, Stolz JF. Microbial reduction of chromate in the presence of nitrate by three nitrate respiring organisms. Front Microbiol 2012; 3:416. [PMID: 23251135 PMCID: PMC3523564 DOI: 10.3389/fmicb.2012.00416] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 11/19/2012] [Indexed: 11/19/2022] Open
Abstract
A major challenge for the bioremediation of toxic metals is the co-occurrence of nitrate, as it can inhibit metal transformation. Geobacter metallireducens, Desulfovibrio desulfuricans, and Sulfurospirillum barnesii are three soil bacteria that can reduce chromate [Cr(VI)] and nitrate, and may be beneficial for developing bioremediation strategies. All three organisms respire through dissimilatory nitrate reduction to ammonia (DNRA), employing different nitrate reductases but similar nitrite reductase (Nrf). G. metallireducens reduces nitrate to nitrite via the membrane bound nitrate reductase (Nar), while S. barnesii and D. desulfuricans strain 27774 have slightly different forms of periplasmic nitrate reductase (Nap). We investigated the effect of DNRA growth in the presence of Cr(VI) in these three organisms and the ability of each to reduce Cr(VI) to Cr(III), and found that each organisms responded differently. Growth of G. metallireducens on nitrate was completely inhibited by Cr(VI). Cultures of D. desulfuricans on nitrate media was initially delayed (48 h) in the presence of Cr(VI), but ultimately reached comparable cell yields to the non-treated control. This prolonged lag phase accompanied the transformation of Cr(VI) to Cr(III). Viable G. metallireducens cells could reduce Cr(VI), whereas Cr(VI) reduction by D. desulfuricans during growth, was mediated by a filterable and heat stable extracellular metabolite. S. barnesii growth on nitrate was not affected by Cr(VI), and Cr(VI) was reduced to Cr(III). However, Cr(VI) reduction activity in S. barnesii, was detected in both the cell free spent medium and cells, indicating both extracellular and cell associated mechanisms. Taken together, these results have demonstrated that Cr(VI) affects DNRA in the three organisms differently, and that each have a unique mechanism for Cr(VI) reduction.
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Affiliation(s)
- Peter Chovanec
- Department of Biological Sciences, Duquesne University Pittsburgh, PA, USA ; Department of Chemistry and Biochemistry, Duquesne University Pittsburgh, PA, USA
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Mao X, Yuan S, Fallahpour N, Ciblak A, Howard J, Padilla I, Loch-Caruso R, Alshawabkeh AN. Electrochemically induced dual reactive barriers for transformation of TCE and mixture of contaminants in groundwater. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:12003-11. [PMID: 23067023 PMCID: PMC3493133 DOI: 10.1021/es301711a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A novel reactive electrochemical flow system consisting of an iron anode and a porous cathode is proposed for the remediation of mixture of contaminants in groundwater. The system consists of a series of sequentially arranged electrodes, a perforated iron anode, a porous copper cathode followed by a mesh-type mixed metal oxide anode. The iron anode generates ferrous species and a chemically reducing environment, the porous cathode provides a reactive electrochemically reducing barrier, and the inert anode provides protons and oxygen to neutralize the system. The redox conditions of the electrolyte flowing through this system can be regulated by controlling the distribution of the electric current. Column experiments are conducted to evaluate the process and study the variables. The electrochemical reduction on a copper foam cathode produced an electrode-based reductive potential capable of reducing TCE and nitrate. Rational electrodes arrangement, longer residence time of electrolytes and higher surface area of the foam electrode improve the reductive transformation of TCE. More than 82.2% TCE removal efficiency is achieved for the case of low influent concentration (<7.5 mg/L) and high current (>45 mA). The ferrous species produced from the iron anode not only enhance the transformation of TCE on the cathode, but also facilitates transformation of other contaminants including dichromate, selenate and arsenite. Removal efficiencies greater than 80% are achieved for these contaminants in flowing contaminated water. The overall system, comprising the electrode-based and electrolyte-based barriers, can be engineered as a versatile and integrated remedial method for a relatively wide spectrum of contaminants and their mixtures.
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Affiliation(s)
- Xuhui Mao
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
- School of Resources and Environmental Science, Wuhan University, Wuhan 430079, P. R. China
| | - Songhu Yuan
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
- State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, P. R. China
| | - Noushin Fallahpour
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
| | - Ali Ciblak
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
| | - Joniqua Howard
- Department of Civil Engineering and Surveying, University of Puerto Rico, Mayaguez, Puerto Rico, 00681
| | - Ingrid Padilla
- Department of Civil Engineering and Surveying, University of Puerto Rico, Mayaguez, Puerto Rico, 00681
| | - Rita Loch-Caruso
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109
| | - Akram N. Alshawabkeh
- Civil and Environmental Engineering Department, Northeastern University, Boston, MA, 02115, USA
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Ravindranath SP, Kadam US, Thompson DK, Irudayaraj J. Intracellularly grown gold nanoislands as SERS substrates for monitoring chromate, sulfate and nitrate localization sites in remediating bacteria biofilms by Raman chemical imaging. Anal Chim Acta 2012; 745:1-9. [PMID: 22938600 DOI: 10.1016/j.aca.2012.07.037] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 07/23/2012] [Accepted: 07/26/2012] [Indexed: 11/25/2022]
Abstract
Understanding the chemical composition of biofilm matrices is vital in different fields of biology such as surgery, dental medicine, synthetic grafts and bioremediation. The knowledge of biofilm development, composition, active reduction sites and remediation efficacy will help in the development of effective solutions and evaluation of remediating approaches prior to implementation. Surface-enhanced Raman spectroscopy (SERS) based imaging is an invaluable tool to obtain an understanding of the remediating efficacy of microorganisms and its role in the formation of organic and inorganic compounds in biofilms. We demonstrate for the first time, the presence of chromate, sulfate, nitrate and reduced trivalent chromium in soil biofilms. In addition, we demonstrate that SERS imaging was able to validate two observations made by previous studies on chromate/sulfate and chromate/nitrate interactions in Shewanella oneidensis MR-1 biofilms. Additionally, we show a detailed Raman mapping based evidence of the existence of chromate-sulfate competition for cellular entry. Subsequently, we use Raman mapping to study the effect of nitrate on chromate reduction. The findings presented in this paper are among the first to report - detection of multiple metallic ions in bacterial biofilms using intracellular SERS substrates. Such a detailed characterization of biofilms using gold nanoislands based SERS mapping substrate can be extended to study cellular localization of other metallic ions and chemical species of biological and toxicological significance and their effect on reduction reactions in bacterial biofilms.
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Affiliation(s)
- Sandeep P Ravindranath
- Bindley Bioscience Centre, Department of Agricultural & Biological Engineering, United States.
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Meng X, Liu G, Zhou J, Shiang Fu Q, Wang G. Azo dye decolorization by Shewanella aquimarina under saline conditions. BIORESOURCE TECHNOLOGY 2012; 114:95-101. [PMID: 22449986 DOI: 10.1016/j.biortech.2012.03.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 03/01/2012] [Accepted: 03/02/2012] [Indexed: 05/15/2023]
Abstract
Decolorization of azo dyes under saline conditions was studied with Shewanella aquimarina, which demonstrated good growth at up to 7% NaCl. No inhibition on acid red 27 (AR27) decolorization was caused by 1-3% NaCl. Additionally, 14.5% AR27 (0.2mM) could still be removed in 12h in the presence of 10% NaCl. The relationship between specific decolorization rate and AR27 concentration followed Michaelis-Menten kinetics (K(m)=0.34 mM, V(max)=6.44 μmol mg cell(-1) h(-1)). Lactate and formate were efficient electron donors for AR27 decolorization. The initial decolorization rate was in direct proportion to biomass concentration (0.18-0.72 g l(-1)). Compared to NaCl, slighter inhibitive effects were found with Na(2)SO(4) whereas more severe inhibition was caused by NaNO(3). Lower NaCl concentration stimulated azoreductase, laccase and NADH-DCIP reductase activities of cell extracts. AR27 decolorization products were found to be aromatic amines, which were less phytotoxic than the untreated dye.
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Affiliation(s)
- Xianming Meng
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China
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Rosenbaum MA, Bar HY, Beg QK, Segrè D, Booth J, Cotta MA, Angenent LT. Transcriptional analysis of Shewanella oneidensis MR-1 with an electrode compared to Fe(III)citrate or oxygen as terminal electron acceptor. PLoS One 2012; 7:e30827. [PMID: 22319591 PMCID: PMC3271074 DOI: 10.1371/journal.pone.0030827] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 12/29/2011] [Indexed: 11/19/2022] Open
Abstract
Shewanella oneidensis is a target of extensive research in the fields of bioelectrochemical systems and bioremediation because of its versatile metabolic capabilities, especially with regard to respiration with extracellular electron acceptors. The physiological activity of S. oneidensis to respire at electrodes is of great interest, but the growth conditions in thin-layer biofilms make physiological analyses experimentally challenging. Here, we took a global approach to evaluate physiological activity with an electrode as terminal electron acceptor for the generation of electric current. We performed expression analysis with DNA microarrays to compare the overall gene expression with an electrode to that with soluble iron(III) or oxygen as the electron acceptor and applied new hierarchical model-based statistics for the differential expression analysis. We confirmed the differential expression of many genes that have previously been reported to be involved in electrode respiration, such as the entire mtr operon. We also formulate hypotheses on other possible gene involvements in electrode respiration, for example, a role of ScyA in inter-protein electron transfer and a regulatory role of the cbb3-type cytochrome c oxidase under anaerobic conditions. Further, we hypothesize that electrode respiration imposes a significant stress on S. oneidensis, resulting in higher energetic costs for electrode respiration than for soluble iron(III) respiration, which fosters a higher metabolic turnover to cover energy needs. Our hypotheses now require experimental verification, but this expression analysis provides a fundamental platform for further studies into the molecular mechanisms of S. oneidensis electron transfer and the physiologically special situation of growth on a poised-potential surface.
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Affiliation(s)
- Miriam A. Rosenbaum
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York, United States of America
| | - Haim Y. Bar
- Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, New York, United States of America
| | - Qasim K. Beg
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, United States of America
| | - Daniel Segrè
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, United States of America
- Department of Biology, Boston University, Boston, Massachusetts, United States of America
- Bioinformatics Program, Boston University, Boston, Massachusetts, United States of America
| | - James Booth
- Department of Biological Statistics and Computational Biology, Cornell University, Ithaca, New York, United States of America
| | - Michael A. Cotta
- Bioenergy Research Unit, United States Department of Agriculture, Agricultural Research Service (ARS), National Center for Agricultural Utilization Research (NCAUR), Peoria, Illinois, United States of America
| | - Largus T. Angenent
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York, United States of America
- * E-mail:
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Hsu L, Masuda SA, Nealson KH, Pirbazari M. Evaluation of microbial fuel cell Shewanella biocathodes for treatment of chromate contamination. RSC Adv 2012. [DOI: 10.1039/c2ra20478a] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Garg SK, Tripathi M, Srinath T. Strategies for chromium bioremediation of tannery effluent. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2012; 217:75-140. [PMID: 22350558 DOI: 10.1007/978-1-4614-2329-4_2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Bioremediation offers the possibility of using living organisms (bacteria, fungi, algae,or plants), but primarily microorganisms, to degrade or remove environmental contaminants, and transform them into nontoxic or less-toxic forms. The major advantages of bioremediation over conventional physicochemical and biological treatment methods include low cost, good efficiency, minimization of chemicals, reduced quantity of secondary sludge, regeneration of cell biomass, and the possibility of recover-ing pollutant metals. Leather industries, which extensively employ chromium compounds in the tanning process, discharge spent-chromium-laden effluent into nearby water bodies. Worldwide, chromium is known to be one of the most common inorganic contaminants of groundwater at pollutant hazardous sites. Hexavalent chromium poses a health risk to all forms of life. Bioremediation of chromium extant in tannery waste involves different strategies that include biosorption, bioaccumulation,bioreduction, and immobilization of biomaterial(s). Biosorption is a nondirected physiochemical interaction that occurs between metal species and the cellular components of biological species. It is metabolism-dependent when living biomass is employed, and metabolism-independent in dead cell biomass. Dead cell biomass is much more effective than living cell biomass at biosorping heavy metals, including chromium. Bioaccumulation is a metabolically active process in living organisms that works through adsorption, intracellular accumulation, and bioprecipitation mechanisms. In bioreduction processes, microorganisms alter the oxidation/reduction state of toxic metals through direct or indirect biological and chemical process(es).Bioreduction of Cr6+ to Cr3+ not only decreases the chromium toxicity to living organisms, but also helps precipitate chromium at a neutral pH for further physical removal,thus offering promise as a bioremediation strategy. However, biosorption, bioaccumulation, and bioreduction methods that rely on free cells for bioremediation suffer from Cr6 toxicity, and cell damage. Therefore, immobilization of microbial cell biomass enhances bioremediation and renders industrial bioremediation processes more economically viable from reduced free-cells toxicity, easier separation of biosorbents from the tannery effluent, ability to achieve multiple biosorption cycles, and desorption (elution) of metal(s) from matrices for reuse. Thus, microbial bioremediation can be a cost competitive strategy and beneficial bioresource for removing many hazardous contaminants from tannery and other industrial wastes.
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Affiliation(s)
- Satyendra Kumar Garg
- Department of Microbiology, Dr. Ram Manohar Lohia Avadh University, Faizabad, India.
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Functional characterization of Crp/Fnr-type global transcriptional regulators in Desulfovibrio vulgaris Hildenborough. Appl Environ Microbiol 2011; 78:1168-77. [PMID: 22156435 DOI: 10.1128/aem.05666-11] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Crp/Fnr-type global transcriptional regulators regulate various metabolic pathways in bacteria and typically function in response to environmental changes. However, little is known about the function of four annotated Crp/Fnr homologs (DVU0379, DVU2097, DVU2547, and DVU3111) in Desulfovibrio vulgaris Hildenborough. A systematic study using bioinformatic, transcriptomic, genetic, and physiological approaches was conducted to characterize their roles in stress responses. Similar growth phenotypes were observed for the crp/fnr deletion mutants under multiple stress conditions. Nevertheless, the idea of distinct functions of Crp/Fnr-type regulators in stress responses was supported by phylogeny, gene transcription changes, fitness changes, and physiological differences. The four D. vulgaris Crp/Fnr homologs are localized in three subfamilies (HcpR, CooA, and cc). The crp/fnr knockout mutants were well separated by transcriptional profiling using detrended correspondence analysis (DCA), and more genes significantly changed in expression in a ΔDVU3111 mutant (JW9013) than in the other three paralogs. In fitness studies, strain JW9013 showed the lowest fitness under standard growth conditions (i.e., sulfate reduction) and the highest fitness under NaCl or chromate stress conditions; better fitness was observed for a ΔDVU2547 mutant (JW9011) under nitrite stress conditions and a ΔDVU2097 mutant (JW9009) under air stress conditions. A higher Cr(VI) reduction rate was observed for strain JW9013 in experiments with washed cells. These results suggested that the four Crp/Fnr-type global regulators play distinct roles in stress responses of D. vulgaris. DVU3111 is implicated in responses to NaCl and chromate stresses, DVU2547 in nitrite stress responses, and DVU2097 in air stress responses.
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Hong Y, Wu P, Li W, Gu J, Duan S. Humic analog AQDS and AQS as an electron mediator can enhance chromate reduction by Bacillus sp. strain 3C3. Appl Microbiol Biotechnol 2011; 93:2661-8. [PMID: 21938640 DOI: 10.1007/s00253-011-3577-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 08/18/2011] [Accepted: 09/09/2011] [Indexed: 11/28/2022]
Abstract
Humus as an electron mediator is recognized as an effective strategy to improve the biological transformation and degradation of toxic substances, yet the action of humus in microbial detoxification of chromate is still unknown. In this study, a humus-reducing strain 3C(3) was isolated from mangrove sediment. Based on the analyses of morphology, physiobiochemical characteristics, and 16S rRNA gene sequence, this strain was identified Bacillus sp. Strain 3C(3) can effectively reduce humic analog anthraquinone-2,6-disulfonate (AQDS) and anthraquinone-2-sulfonate (AQS) with lactate, formate, or glucose as electron donors. When the cells were killed by incubation at 95°C for 30 min or an electron donor was absent, the humic reduction did not occur, showing that the humic reduction was a biochemical process. However, strain 3C(3) had low capability of chromate reduction under anaerobic conditions, despite of having strong tolerance of the toxic metal. But in the presence of humic substances AQDS or AQS, we found that chromate reduction by strain 3C(3) was enhanced greatly. Because strain 3C(3) is an effective humus-reducing bacterium, it is proposed that humic substances could serve as electron mediator to interact with chromate and accelerate chromate reduction. Our results suggest that chromate contaminations can be detoxified by adding humic analog (low to 0.1 mM) as an electron mediator in the microbial incubation.
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Affiliation(s)
- Yiguo Hong
- State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, People's Republic of China.
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Ravindranath SP, Henne KL, Thompson DK, Irudayaraj J. Raman chemical imaging of chromate reduction sites in a single bacterium using intracellularly grown gold nanoislands. ACS NANO 2011; 5:4729-36. [PMID: 21634405 PMCID: PMC3140767 DOI: 10.1021/nn201105r] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Imaging live molecular events within micro-organisms at single-cell resolution would deliver valuable mechanistic information much needed in understanding key biological processes. We present a surface-enhanced Raman (SERS) chemical imaging strategy as a first step toward exploring the intracellular bioreduction pockets of toxic chromate in Shewanella. In order to achieve this, we take advantage of an innate reductive mechanism in bacteria of reducing gold ions into intracellular gold nanoislands, which provide the necessary enhancement for SERS imaging. We show that SERS has the sensitivity and selectivity not only to identify but also to differentiate between the two stable valence forms of chromate in cells. The imaging platform was used to understand intracellular metal reduction activities in a ubiquitous metal-reducing organism, Shewanella oneidensis MR-1, by mapping chromate reduction.
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Affiliation(s)
- Sandeep P. Ravindranath
- Bindley Bioscience Center, Birck Nanotechnology Center, Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, United States of America
| | - Kristene L. Henne
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47906, United States of America
| | - Dorothea K. Thompson
- Department of Biological Sciences, Purdue University, West Lafayette, IN 47906, United States of America
| | - Joseph Irudayaraj
- Bindley Bioscience Center, Birck Nanotechnology Center, Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47906, United States of America
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Ravindranath SP, Henne KL, Thompson DK, Irudayaraj J. Surface-enhanced Raman imaging of intracellular bioreduction of chromate in Shewanella oneidensis. PLoS One 2011; 6:e16634. [PMID: 21364911 PMCID: PMC3045368 DOI: 10.1371/journal.pone.0016634] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Accepted: 01/05/2011] [Indexed: 11/18/2022] Open
Abstract
This proposed research aims to use novel nanoparticle sensors and spectroscopic tools constituting surface-enhanced Raman spectroscopy (SERS) and Fluorescence Lifetime imaging (FLIM) to study intracellular chemical activities within single bioremediating microorganism. The grand challenge is to develop a mechanistic understanding of chromate reduction and localization by the remediating bacterium Shewanella oneidensis MR-1 by chemical and lifetime imaging. MR-1 has attracted wide interest from the research community because of its potential in reducing multiple chemical and metallic electron acceptors. While several biomolecular approaches to decode microbial reduction mechanisms exist, there is a considerable gap in the availability of sensor platforms to advance research from population-based studies to the single cell level. This study is one of the first attempts to incorporate SERS imaging to address this gap. First, we demonstrate that chromate-decorated nanoparticles can be taken up by cells using TEM and Fluorescence Lifetime imaging to confirm the internalization of gold nanoprobes. Second, we demonstrate the utility of a Raman chemical imaging platform to monitor chromate reduction and localization within single cells. Distinctive differences in Raman signatures of Cr(VI) and Cr(III) enabled their spatial identification within single cells from the Raman images. A comprehensive evaluation of toxicity and cellular interference experiments conducted revealed the inert nature of these probes and that they are non-toxic. Our results strongly suggest the existence of internal reductive machinery and that reduction occurs at specific sites within cells instead of at disperse reductive sites throughout the cell as previously reported. While chromate-decorated gold nanosensors used in this study provide an improved means for the tracking of specific chromate interactions within the cell and on the cell surface, we expect our single cell imaging tools to be extended to monitor the interaction of other toxic metal species.
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Affiliation(s)
- Sandeep P Ravindranath
- Bindley Bioscience Center, Birck Nanotechnology Center, Agricultural and Biological Engineering, Purdue University, West Lafayette, Indiana, United States of America.
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Han R, Geller JT, Yang L, Brodie EL, Chakraborty R, Larsen JT, Beller HR. Physiological and transcriptional studies of Cr(VI) reduction under aerobic and denitrifying conditions by an aquifer-derived pseudomonad. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:7491-7497. [PMID: 20822129 DOI: 10.1021/es101152r] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Cr(VI) is a widespread groundwater contaminant that is a potent toxin, mutagen, and carcinogen. In situ reductive immobilization is a favored approach for Cr(VI) bioremediation, and Cr(VI) reduction has been reported in a variety of aerobic, facultative, and anaerobic bacteria, including a number of pseudomonads. However, studies comparing Cr(VI) reduction under aerobic and denitrifying conditions in the same organism are not available. We have conducted studies with strain RCH2, a bacterium similar to Pseudomonas stutzeri that we isolated from a Cr-contaminated aquifer. Cell suspension studies with lactate demonstrated that Cr(VI) reduction could occur under either denitrifying or aerobic conditions (at comparable specific rates) and that reduction was at least 20-fold more rapid when the terminal electron acceptor (i.e., nitrate or O(2)) was present. Our results suggest that Cr(VI) reduction by strain RCH2 under either aerobic or denitrifying conditions is primarily cometabolic in the sense that the physiological electron acceptor (oxygen or nitrate) appears to be required. Under both aerobic and denitrifying conditions, the gene(s) associated with chromate reduction are not inducible by Cr. Continuous culture (chemostat) studies showed strong correlations (r(2) values >0.93) between nitrate reduction rate and the transcript copy number of either nirS (cytochrome cd(1) nitrite reductase) or narG (nitrate reductase α subunit). As our studies indicate that anaerobic Cr(VI) reduction by this pseudomonad requires active denitrification and that denitrification and chromate reduction rates are highly correlated (r(2) > 0.99), monitoring expression of such denitrification genes in biostimulated aquifers could provide valuable proxy information for in situ chromate reduction by similar bacteria even if the specific genes involved in chromate reduction have not been identified. We also report incomplete removal of reduced Cr from solution and on artifacts in the widely used diphenylcarbazide assay for Cr(VI), most notably, its complete inactivation in the presence of millimolar nitrite.
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Affiliation(s)
- Ruyang Han
- Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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Chromate reductase activity of the Paracoccus denitrificans ferric reductase B (FerB) protein and its physiological relevance. Arch Microbiol 2010; 192:919-26. [PMID: 20821194 DOI: 10.1007/s00203-010-0622-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 08/07/2010] [Accepted: 08/18/2010] [Indexed: 10/19/2022]
Abstract
The homodimeric flavoprotein FerB of Paracoccus denitrificans catalyzed the reduction of chromate with NADH as electron donor. When present, oxygen was reduced concomitantly with chromate. The recombinant enzyme had a maximum activity at pH 5.0. The stoichiometric ratio of NADH oxidized to chromate reduced was found to be 1.53 ± 0.09 (O(2) absent) or > 2 (O(2) present), the apparent K (M) value for chromate amounted to 70 ± 10 μM with the maximum rate of 2.9 ± 0.3 μmol NADH s(-1) (mg protein)(-1). Diode-array spectrophotometry and experiments with one-electron acceptors provided evidence for oxygen consumption being due to a flavin semiquinone, formed transiently during the interaction of FerB with chromate. At the whole-cell level, a ferB mutant strain displayed only slightly diminished rate of chromate reduction when compared to the wild-type parental strain. Anaerobically grown cells were more active than cells grown aerobically. The activity could be partly inhibited by antimycin, suggesting an involvement of the respiratory chain. Chromate concentrations above ten micromolars transiently slowed or halted culture growth, with the effect being more pronounced for the mutant strain. It appears, therefore, that, rather than directly reducing chromate, FerB confers a protection of cells against the oxidative stress accompanying chromate reduction. With a strain carrying the chromosomally integrated ferB promoter-lacZ fusion, it was shown that the ferB gene is not inducible by chromate.
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Zhang M, Ginn BR, Dichristina TJ, Stack AG. Adhesion of Shewanella oneidensis MR-1 to iron (Oxy)(Hydr)oxides: microcolony formation and isotherm. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:1602-1609. [PMID: 20131792 DOI: 10.1021/es901793a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The adhesion of dissimilatory metal reducing bacteria (DMRB) to iron (oxy)(hydr)oxides may play an important role in their respiration on ferric iron-containing minerals, but few quantitative surface cell density measurements have been made thus far. We used confocal microscopy to examine the adhesion of a common DMRB species, Shewanella oneidensis MR-1, onto iron (oxy)(hydr)oxide particulate-coated glass slides across a broad range of bulk (i.e., solution phase) cell densities from 10(5) cells/mL to 2 x 10(9) cells/mL. At bulk cell densities less than 1 x 10(7) cells/mL, cells adhered to the slide surface formed an evenly distributed, homogeneous monolayer, while at the bulk cell densities higher than 2 x 10(8) cells/mL the adhered cells formed distinct microcolonies. As a result of this complex adhesion behavior, simple Langmuir or Freundlich adsorption isotherms do not capture the relationship between the surface cell density and the bulk cell density over the entire range of bulk cell densities. Thus a new, two-step isotherm was developed that incorporated both isolated attached cells at low cell densities as well as microcolonies at higher cell densities.
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Affiliation(s)
- Mengni Zhang
- School of Earth and Atmospheric Sciences, and School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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Song H, Liu Y, Xu W, Zeng G, Aibibu N, Xu L, Chen B. Simultaneous Cr(VI) reduction and phenol degradation in pure cultures of Pseudomonas aeruginosa CCTCC AB91095. BIORESOURCE TECHNOLOGY 2009; 100:5079-5084. [PMID: 19541478 DOI: 10.1016/j.biortech.2009.05.060] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 05/23/2009] [Accepted: 05/25/2009] [Indexed: 05/27/2023]
Abstract
Simultaneous Cr(VI) reduction and phenol degradation were investigated in a reactor containing Pseudomonas aeruginosa CCTCC AB91095. Phenol was used as carbon source. P.aeruginosa utilized metabolites formed during phenol degradation as energy source for Cr(VI) reduction. Cr(VI) inhibited both Cr(VI) reduction and phenol degradation when Cr(VI) concentration exceeded the optimum value (20 mg/L), whereas phenol enhanced both Cr(VI) reduction and phenol degradation below the optimum initial concentration of 100 mg/L. Cr(III) was the predominant product of Cr(VI) reduction in cultures after incubation for 24 h. Both Cr(VI) reduction and phenol degradation were influenced by the amount of inocula. The concentration of Cr(VI) and phenol declined quickly from 20, 100 to 3.36, 29.51 mg/L in cultures containing of 5% (v/v) inoculum after incubation for 12 h, respectively. The whole study showed that P. aeruginosa is promising for the reduction of toxic Cr(VI) and degradation of organic pollutants simultaneously in the mineral liquid medium.
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Affiliation(s)
- Huaxiao Song
- College of Environmental Science and Engineering, Hunan University, Lushan Road, Changsha 410082, China
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Viamajala S, Peyton BM, Gerlach R, Sivaswamy V, Apel WA, Petersen JN. Permeable reactive biobarriers for in situ Cr(VI) reduction: Bench scale tests usingCellulomonassp. strain ES6. Biotechnol Bioeng 2008; 101:1150-62. [DOI: 10.1002/bit.22020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Viamajala S, Peyton BM, Sani RK, Apel WA, Petersen JN. Toxic Effects of Chromium(VI) on Anaerobic and Aerobic Growth of Shewanella oneidensis MR-1. Biotechnol Prog 2008; 20:87-95. [PMID: 14763828 DOI: 10.1021/bp034131q] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cr(VI) was added to early- and mid-log-phase Shewanella oneidensis (S. oneidensis) MR-1 cultures to study the physiological state-dependent toxicity of Cr(VI). Cr(VI) reduction and culture growth were measured during and after Cr(VI) reduction. Inhibition of growth was observed when Cr(VI) was added to cultures of MR-1 growing aerobically or anaerobically with fumarate as the terminal electron acceptor. Under anaerobic conditions, there was immediate cessation of growth upon addition of Cr(VI) in early- and mid-log-phase cultures. However, once Cr(VI) was reduced below detection limits (0.002 mM), the cultures resumed growth with normal cell yield values observed. In contrast to anaerobic MR-1 cultures, addition of Cr(VI) to aerobically growing cultures resulted in a gradual decrease of the growth rate. In addition, under aerobic conditions, lower cell yields were also observed with Cr(VI)-treated cultures when compared to cultures that were not exposed to Cr(VI). Differences in response to Cr(VI) between aerobically and anaerobically growing cultures indicate that Cr(VI) toxicity in MR-1 is dependent on the physiological growth condition of the culture. Cr(VI) reduction has been previously studied in Shewanella spp., and it has been proposed that Shewanella spp. may be used in Cr(VI) bioremediation systems. Studies of Shewanella spp. provide valuable information on the microbial physiology of dissimilatory metal reducing bacteria; however, our study indicates that S. oneidensis MR-1 is highly susceptible to growth inhibition by Cr(VI) toxicity, even at low concentrations [0.015 mM Cr(VI)].
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Affiliation(s)
- Sridhar Viamajala
- Department of Chemical Engineering, and WSU/NSF IGERT Center for Multiphase Environmental Research, Washington State University, P.O. Box 642719, Pullman, Washington 99164-2719, USA
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Chourey K, Wei W, Wan XF, Thompson DK. Transcriptome analysis reveals response regulator SO2426-mediated gene expression in Shewanella oneidensis MR-1 under chromate challenge. BMC Genomics 2008; 9:395. [PMID: 18718017 PMCID: PMC2535785 DOI: 10.1186/1471-2164-9-395] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Accepted: 08/21/2008] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Shewanella oneidensis MR-1 exhibits diverse metal ion-reducing capabilities and thus is of potential utility as a bioremediation agent. Knowledge of the molecular components and regulatory mechanisms dictating cellular responses to heavy metal stress, however, remains incomplete. In a previous work, the S. oneidensis so2426 gene, annotated as a DNA-binding response regulator, was demonstrated to be specifically responsive at both the transcript and protein levels to acute chromate [Cr(VI)] challenge. To delineate the cellular function of SO2426 and its contribution to metal stress response, we integrated genetic and physiological approaches with a genome-wide screen for target gene candidates comprising the SO2426 regulon. RESULTS Inactivation of so2426 by an in-frame deletion resulted in enhanced chromate sensitivity and a reduced capacity to remove extracellular Cr(VI) relative to the parental strain. Time-resolved microarray analysis was used to compare transcriptomic profiles of wild-type and SO2426-deficient mutant S. oneidensis under conditions of chromate exposure. In total, 841 genes (18% of the arrayed genome) were up- or downregulated at least twofold in the Deltaso2426 mutant for at least one of six time-point conditions. Hierarchical cluster analysis of temporal transcriptional profiles identified a distinct cluster (n = 46) comprised of co-ordinately regulated genes exhibiting significant downregulated expression (p < 0.05) over time. Thirteen of these genes encoded proteins associated with transport and binding functions, particularly those involved in Fe transport and homeostasis (e.g., siderophore biosynthetic enzymes, TonB-dependent receptors, and the iron-storage protein ferritin). A conserved hypothetical operon (so1188-so1189-so1190), previously identified as a potential target of Fur-mediated repression, as well as a putative bicyclomycin resistance gene (so2280) and cation efflux family protein gene (so2045) also were repressed in the so2426 deletion mutant. Furthermore, the temporal expression profiles of four regulatory genes including a cpxR homolog were perturbed in the chromate-challenged mutant. CONCLUSION Our findings suggest a previously unrecognized functional role for the response regulator SO2426 in the activation of genes required for siderophore-mediated Fe acquisition, Fe storage, and other cation transport mechanisms. SO2426 regulatory function is involved at a fundamental molecular level in the linkage between Fe homeostasis and the cellular response to chromate-induced stress in S. oneidensis.
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Affiliation(s)
- Karuna Chourey
- Department of Biological Sciences, Purdue University, 915 W, State Street, West Lafayette, IN 47907, USA.
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Sani RK, Peyton BM, Dohnalkova A. Comparison of uranium(VI) removal by Shewanella oneidensis MR-1 in flow and batch reactors. WATER RESEARCH 2008; 42:2993-3002. [PMID: 18468655 DOI: 10.1016/j.watres.2008.04.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Revised: 03/21/2008] [Accepted: 04/01/2008] [Indexed: 05/26/2023]
Abstract
To better understand the interactions among metal contaminants, nutrients, and microorganisms in subsurface fracture-flow systems, biofilms of pure culture of Shewanella oneidensis MR-1 were grown in six fracture-flow reactors (FFRs) of different geometries. The spatial and temporal distribution of uranium and bacteria were examined using a tracer dye (brilliant blue FCF) and microscopy. The results showed that plugging by bacterial cells was dependent on the geometry of the reactor and that biofilms grown in FFRs had a limited U(VI)-reduction capacity. To quantify the U(VI)-reduction capacity of biofilms, batch experiments for U(VI) reduction were performed with repetitive U(VI) additions. U(VI)-reduction rates of stationary phase cultures decreased after each U(VI) addition. After the fourth U(VI) addition, stationary phase cultures treated with U(VI) with and without spent medium yielded gray and black precipitates, respectively. These gray and black U precipitates were analyzed using high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Data for randomly selected areas of black precipitates showed that reduced U particles (3-6 nm) were crystalline, whereas gray precipitates were a mixture of crystalline and amorphous solids. Results obtained in this study, including a dramatic limitation of S. oneidensis MR-1 and its biofilms to reduce U(VI) and plugging of FFRs, suggest that alternative organisms should be targeted for stimulation for metal immobilization in subsurface fracture-flow systems.
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Affiliation(s)
- Rajesh K Sani
- Department of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701, USA.
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Hexavalent chromium reduction in Desulfovibrio vulgaris Hildenborough causes transitory inhibition of sulfate reduction and cell growth. Appl Microbiol Biotechnol 2008; 78:1007-16. [DOI: 10.1007/s00253-008-1381-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2007] [Revised: 01/07/2008] [Accepted: 01/18/2008] [Indexed: 10/22/2022]
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