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González-López F, Alonso-Molina JL, Mendoza-Roca JA, Cuartas-Uribe B, Rendón-Castrillón L, Ocampo-López C, Ramírez-Carmona M. Native microorganisms for sustainable dye biodegradation in wastewaters from jeans finishing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:64675-64687. [PMID: 39546246 DOI: 10.1007/s11356-024-35563-1] [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: 08/01/2024] [Accepted: 11/09/2024] [Indexed: 11/17/2024]
Abstract
The textile mill is one of the most water-consuming industries. Wastewater production is very high, and among the main generated pollutants are dyes. In particular, jeans finishing, which is performed all over the world, generates wastewater with indigo dye that has to be eliminated before discharge. This work studies the biological treatment of this type of wastewater using native microorganisms, i.e., without the need for external seed sludge to start-up the process. Two strategies for starting up the biological treatment using laboratory sequencing batch reactors have been compared: the addition of seed sludge from a biological reactor of a wastewater treatment plant and the non-addition of seed sludge, which means that native microorganisms (those in wastewater coming from the industry facilities) are responsible for COD and color degradation. Special attention is paid to biomass shift in both reactors, analyzing both bacterial and fungal populations. Results yielded more than 90% of COD and color removal after 25 days in both reactors. MLSS increased in both reactors during the operation, reaching very similar values (around 1840 mg/L). Rozellomycota was the predominant phylum in the reactors. Concerning bacteria, Planctomycetota abundance increased considerably in both reactors, which shows the important role of these bacteria in the treatment. It can be concluded that the lower bacterial diversity in the native population in comparison with the seeded sludge was shifting to a higher microbial diversity during the process, achieving a similar microbial population in reactors. It implies that it is not necessary to either work with isolated cultures or seeded sludge, which leads to a simpler and more sustainable solution for textile wastewater treatment in areas all over the world.
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Affiliation(s)
- Federico González-López
- Centro de Estudios y de Investigación en Biotecnología (CIBIOT), Facultad de Ingeniería Química, Universidad Pontificia Bolivariana, Circular 1ª No. 70-01, 050031, Medellín, Colombia
| | - José-Luis Alonso-Molina
- Instituto Universitario de Ingeniería del Agua y del Medio Ambiente, Universitat Politècnica de València, Camino de Vera S/N, 46022, Valencia, Spain
| | - José-Antonio Mendoza-Roca
- Instituto de Seguridad Industrial, Radiofísica y Medioambiental, Universitat Politècnica de València, Camino de Vera S/N, 46022, Valencia, Spain
| | - Beatriz Cuartas-Uribe
- Instituto de Seguridad Industrial, Radiofísica y Medioambiental, Universitat Politècnica de València, Camino de Vera S/N, 46022, Valencia, Spain.
| | - Leidy Rendón-Castrillón
- Centro de Estudios y de Investigación en Biotecnología (CIBIOT), Facultad de Ingeniería Química, Universidad Pontificia Bolivariana, Circular 1ª No. 70-01, 050031, Medellín, Colombia
| | - Carlos Ocampo-López
- Centro de Estudios y de Investigación en Biotecnología (CIBIOT), Facultad de Ingeniería Química, Universidad Pontificia Bolivariana, Circular 1ª No. 70-01, 050031, Medellín, Colombia
| | - Margarita Ramírez-Carmona
- Centro de Estudios y de Investigación en Biotecnología (CIBIOT), Facultad de Ingeniería Química, Universidad Pontificia Bolivariana, Circular 1ª No. 70-01, 050031, Medellín, Colombia
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Wang Z, Zhou H, Cheng Y, An L, Yan D, Chao H, Wu J. Novel small multidrug resistance protein Tmt endows the Escherichia coli with triphenylmethane dyes bioremediation capability. Biotechnol Lett 2024; 46:627-639. [PMID: 38662307 DOI: 10.1007/s10529-024-03480-5] [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: 12/05/2023] [Revised: 02/23/2024] [Accepted: 03/10/2024] [Indexed: 04/26/2024]
Abstract
Dye contamination in printing and dyeing wastewater has long been a major concern due to its serious impact on both the environment and human health. In the quest for bioremediation of these hazardous dyes, biological resources such as biodegradation bacteria and enzymes have been investigated in severely polluted environments. In this context, the triphenylmethane transporter gene (tmt) was identified in six distinct clones from a metagenomic library of the printing and dyeing wastewater treatment system. Escherichia coli expressing tmt revealed 98.1% decolorization efficiency of triphenylmethane dye malachite green within 24 h under shaking culture condition. The tolerance to malachite green was improved over eightfold in the Tmt strain compared of the none-Tmt expressed strain. Similarly, the tolerance of Tmt strain to other triphenylmethane dyes like crystal violet and brilliant green, was improved by at least fourfold. Site-directed mutations, including A75G, A75S and V100G, were found to reinforce the tolerance of malachite green, and double mutations of these even further improve the tolerance. Therefore, the tmt has been demonstrated to be a specific efflux pump for triphenylmethane dyes, particularly the malachite green. By actively pumping out toxic triphenylmethane dyes, it significantly extends the cells tolerance in a triphenylmethane dye-rich environment, which may provide a promising strategy for bioremediation of triphenylmethane dye pollutants in the environments.
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Affiliation(s)
- Zhou Wang
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Haoqiang Zhou
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Yilan Cheng
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Lijin An
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Dazhong Yan
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Hongjun Chao
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China
| | - Jing Wu
- School of Life Science and Technology, Wuhan Polytechnic University, Wuhan, 430023, People's Republic of China.
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Sun Y, Zhang Y, Li W, Zhang W, Xu Z, Dai M, Zhao G. Combination of the endophytic manganese-oxidizing bacterium Pantoea eucrina SS01 and biogenic Mn oxides: An efficient and sustainable complex in degradation and detoxification of malachite green. CHEMOSPHERE 2021; 280:130785. [PMID: 33971420 DOI: 10.1016/j.chemosphere.2021.130785] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 04/08/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
Recently, Mn oxides (MnOxs) have been attracting considerable interest in the oxidation of organic pollutants. However, the reduction of MnOx in these reactions leads to the deactivation of the catalyst, which must be frequently regenerated. We evaluated the application of a manganese-oxidizing bacterium (MOB) and MnOx in removing toxic dyes. We studied the co-function of a plant-endophytic MOB, Pantoea eucrina SS01, with its bio-generated MnOx and evaluated the detoxification activity and chemical transformation mechanisms of the complex in malachite green (MG) degradation. We found a synergistic effect between MnOx and the strain. Particularly, strain SS01 could adsorb MG but could not degrade it, whereas the addition of Mn(II) promoted MG degradation by the formation of a complex containing the bacterium and MnOx aggregates (SS01-bio-MnOx), with distinct morphology characteristics. The complex showed a marked sustainability in the degradation of MG into less toxic or non-toxic metabolites. In this process, strain SS01 might have enhanced the regeneration of MnOx, accelerating MG degradation. Our data not only contribute to understanding the mechanism of MG removal by the SS01-bio-MnOx complex, but also provide a scientific basis for the future application of MOB and MnOx.
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Affiliation(s)
- Yuankai Sun
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Yonggang Zhang
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Wenzhe Li
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Wenchang Zhang
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Zhenlu Xu
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Meixue Dai
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China
| | - Guoyan Zhao
- College of Life Science, Shandong Normal University, Jinan, 250014, PR China.
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Han S, Han W, Chen J, Sun Y, Dai M, Zhao G. Bioremediation of malachite green by cyanobacterium Synechococcus elongatus PCC 7942 engineered with a triphenylmethane reductase gene. Appl Microbiol Biotechnol 2020; 104:3193-3204. [PMID: 32067057 DOI: 10.1007/s00253-020-10438-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/24/2020] [Accepted: 02/05/2020] [Indexed: 02/07/2023]
Abstract
Malachite green is a carcinogenic dye that has been detected in fish tissues and freshwater. Here we evaluated the malachite green decoloring ability of a photoautotrophic cyanobacterium, Synechococcus elongatus PCC 7942 (Synechococcus), that lives in freshwater. Results show that 99.5% of the dye was removed by Synechococcus through bioabsorption and bioaccumulation; however, the dye was not degraded or chemically modified. Next, we established an engineered Synechococcus strain to degrade the dye after uptake. The triphenylmethane reductase gene katmr was heterologously expressed, resulting in high production of a soluble recombinant protein. The engineered strain showed advanced decoloring abilities at a low cell density and in stressful environments. It degraded malachite green into the smaller molecules 4-methylaminobenzoic acid and 4-hydroxyl-aniline. After treatment with the engineered cyanobacterium, the growth of wheat seeds was fully recovered in the presence of malachite green. These results demonstrate the potential application of the engineered Synechococcus as a photosynthetic cell factory for the removal of malachite green from wastewater.
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Affiliation(s)
- Sheng Han
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Wenbo Han
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling, 712100, Shaanxi, People's Republic of China
| | - Jun Chen
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Yuankai Sun
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Meixue Dai
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China.
| | - Guoyan Zhao
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China.
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1H-1,2,4-Triazole biodegradation by newly isolated Raoultella sp.: A novel biodegradation pathway. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.biteb.2019.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Shang N, Ding M, Dai M, Si H, Li S, Zhao G. Biodegradation of malachite green by an endophytic bacterium Klebsiella aerogenes S27 involving a novel oxidoreductase. Appl Microbiol Biotechnol 2019; 103:2141-2153. [PMID: 30613897 DOI: 10.1007/s00253-018-09583-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 12/10/2018] [Accepted: 12/12/2018] [Indexed: 10/27/2022]
Abstract
Endophytic microorganisms can metabolize organic contaminants and assist in plant growth, thus facilitating the phytoremediation of polluted environments. An endophytic bacterium capable of decoloring malachite green (MG) was isolated from the leaves of the wetland plant Suaeda salsa and was identified as Klebsiella aerogenes S27. Complete decolorization of MG (100 mg/l) was achieved in 8 h at 30 °C and pH 7.0. Ultraviolet-visible spectroscopy and Fourier-transform infrared spectroscopy analyses indicated the degradation of MG by the isolate. The enzymic assays of the strain showed the triphenylmethane reductase (TMR) activity. A gene encoding putative TMR-like protein (named as KaTMR) was cloned and heterologously expressed in Escherichia coli. KaTMR showed only 42.6-43.3% identities in amino acids compared with well-studied TMRs, and it phylogenetically formed a new branch in the family of TMRs. The degraded metabolites by recombinant KaTMR were detected by liquid chromatography-mass spectrometry, showing differences from the products of reported TMRs. The biotransformation pathway of MG was proposed. Phytotoxicity studies revealed the less-toxic nature of the degraded metabolites compared to the dye. This study presented the first report of an endophyte on the degradation and detoxification of triphenylmethane dye via a novel oxidoreductase, thus facilitating the study of the plant-endophyte symbiosis in the bioremediation processes.
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Affiliation(s)
- Nianjie Shang
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Mengjiao Ding
- College of Biological Science and Technology, Hunan Agricultural University, Changsha, 410128, People's Republic of China
| | - Meixue Dai
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Hongli Si
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Shiguo Li
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China
| | - Guoyan Zhao
- College of Life Science, Shandong Normal University, Jinan, 250014, People's Republic of China.
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Wu H, Shen J, Jiang X, Liu X, Sun X, Li J, Han W, Mu Y, Wang L. Bioaugmentation potential of a newly isolated strain Sphingomonas sp. NJUST37 for the treatment of wastewater containing highly toxic and recalcitrant tricyclazole. BIORESOURCE TECHNOLOGY 2018; 264:98-105. [PMID: 29793119 DOI: 10.1016/j.biortech.2018.05.071] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/17/2018] [Accepted: 05/18/2018] [Indexed: 06/08/2023]
Abstract
In order to develop an effective bioaugmentation strategy for the removal of highly toxic and recalcitrant tricyclazole from wastewater, a tricyclazole degrading strain was firstly successfully isolated and identified as Sphingomonas sp. NJUST37. In batch reactors, 100 mg L-1 tricyclazole could be completely removed within 102 h, which was accompanied by significant biomass increase, TOC and COD removal, as well as toxicity reduction. Chromatography analysis and density functional theory simulation indicated that monooxygenation occurred firstly, followed by triazole ring cleavage, decyanation reaction, hydration reaction, deamination, dihydroxylation and final mineralization reaction. Tricyclazole biodegradation condition by NJUST37 was optimized in terms of temperature, pH, tricyclazole concentration and additional carbon and nitrogen sources. After the inoculation of NJUST37 into a pilot-scale powdered activated carbon treatment tank treating real fungicide wastewater, tricyclazole removal efficiency increased to higher than 90%, demonstrating the great potential of NJUST37 for bioaugmentation particularly on tricyclazole biodegradation in practice.
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Affiliation(s)
- Haobo Wu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jinyou Shen
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Xinbai Jiang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiaodong Liu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiuyun Sun
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jiansheng Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Weiqing Han
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yang Mu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Lianjun Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Salt mine microorganisms used for the biotransformation of chlorolactones. PLoS One 2018; 13:e0197384. [PMID: 29771957 PMCID: PMC5957361 DOI: 10.1371/journal.pone.0197384] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 05/01/2018] [Indexed: 11/26/2022] Open
Abstract
The aim of the project was to find new catalysts capable of chlorolactone biotransformation. Three bicyclic chlorolactones with structures possessing one or two methyl groups in their cyclohexane ring were subjected to screening biotransformation using seven bacterial strains and one fungal strain from a salt mine. Three strains of bacteria (Micrococcus luteus Pb10, Micrococcus luteus WSP45, Gordonia alkanivorans Pd25) and one fungal strain (Aspergillus sydowii KGJ10) were able to catalyse hydrolytic dehalogenation of one substrate. The classification of the strains that were effective biocatalysts was confirmed by 16S rDNA analysis. The best result (76%) was obtained using Aspergillus sydowii KGJ10. All strains catalysed hydrolytic dehalogenation without changing the conformation. The equatorial position of the chlorine atom in the substrate turned out to be warrant of the positive result of the biotransformation process.
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Tao Y, Wang F, Meng L, Guo Y, Han M, Li J, Sun C, Wang S. Biological Decolorization and Degradation of Malachite Green by Pseudomonas sp. YB2: Process Optimization and Biodegradation Pathway. Curr Microbiol 2017; 74:1210-1215. [DOI: 10.1007/s00284-017-1306-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 07/11/2017] [Indexed: 11/30/2022]
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10
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Zhang X, Hua M, Lv L, Pan B. Ionic polymer-coated laccase with high activity and enhanced stability: application in the decolourisation of water containing AO7. Sci Rep 2015; 5:8253. [PMID: 25652843 PMCID: PMC4317704 DOI: 10.1038/srep08253] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 01/12/2015] [Indexed: 12/29/2022] Open
Abstract
Eliminating dyes in environmental water purification remains a formidable challenge. Laccase is a unique, environmentally friendly and efficient biocatalyst that can degrade pollutants. However, the use of laccase for the degradation of pollutants is considerably limited by its susceptibility to environmental changes and its poor reusability. We fabricated a novel biocatalyst (LacPG) by coating polyethylenimine onto the native laccase (Lac) followed by crosslinking with glutaraldehyde. The stability of the resulting LacPG was highly enhanced against pH variations, thermal treatments and provided better long-term storage with a negligible loss in enzymatic activity. Compared to Lac, LacPG exhibited significantly higher decolourisation efficiency in the degradation of a representative azo dye, acid orange 7 (AO7), which resulted from the electrostatic attraction between the coating and AO7. LacPG was separated from the AO7 solution using an ultrafiltration unit. The increased size and modified surface chemistry of LacPG facilitated ultrafiltration and reduced membrane fouling. LacPG exhibited enhanced stability, high catalytic activity and favourable properties for membrane separation; therefore, LacPG could be continuously reused in an enzymatic membrane reactor with a high efficiency for decolourising water containing AO7. The developed strategy appears to be promising for enhancing the applicability of laccase in practical water treatment.
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Affiliation(s)
- Xiaolin Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P.R. China
| | - Ming Hua
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P.R. China
| | - Lu Lv
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P.R. China
| | - Bingcai Pan
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, P.R. China
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Gao F, Ding H, Feng Z, Liu D, Zhao Y. Functional display of triphenylmethane reductase for dye removal on the surface of Escherichia coli using N-terminal domain of ice nucleation protein. BIORESOURCE TECHNOLOGY 2014; 169:181-187. [PMID: 25058292 DOI: 10.1016/j.biortech.2014.06.093] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 06/22/2014] [Accepted: 06/26/2014] [Indexed: 06/03/2023]
Abstract
Traditional biological treatment for triphenylmethane dye effluent is stuck with the inaccessibility of dye molecules to intracellular dye-degrading enzyme, thus a high-efficiency and low-cost method for dye decolorization is highly desirable. Here we established a bioremediation approach to display triphenylmethane reductase (TMR) on the surface of Escherichia coli (E. coli) using N-terminal of ice nucleation protein as anchoring motif for triphenylmethane dye decolorization for the first time. Approximately 85% of recombinant protein positioning on the surface of E. coil cells exhibited high activity and stability. The optimal temperature and pH of the surface-displayed TMR are 50 °C and 8.5, respectively. Comparing with other reported microorganisms, the decolorization rate for malachite green of this engineered strain is the highest so far, reaching 640 μmol min(-1) g(-1) dry weight cells. These results indicate that this engineered E. coli strain is a very promising candidate for synthetic dye removal.
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Affiliation(s)
- Fen Gao
- Institute of Microbiology, College of Life Science, Zhejiang University, Hangzhou 310058, China
| | - Haitao Ding
- Institute of Microbiology, College of Life Science, Zhejiang University, Hangzhou 310058, China.
| | - Zhuo Feng
- Institute of Microbiology, College of Life Science, Zhejiang University, Hangzhou 310058, China
| | - Danfeng Liu
- Genclonn Biotech (Hangzhou) Co. Ltd., Hangzhou 310023, China
| | - Yuhua Zhao
- Institute of Microbiology, College of Life Science, Zhejiang University, Hangzhou 310058, China.
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Boduroğlu G, Kiliç NK, Dönmez G. Bioremoval of Reactive Blue 220 by Gonium sp. biomass. ENVIRONMENTAL TECHNOLOGY 2014; 35:2410-2415. [PMID: 25145195 DOI: 10.1080/09593330.2014.908240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Gonium sp. was tested for the bioremoval of Reactive Blue 220 (RB220) dye at different conditions such as pH values, initial dye concentrations and biomass concentrations to evaluate the possibility of using this microalga in treating wastewaters. According to the data obtained from the experiments, microalgae removed RB220 with the highest yield (54.2%) at pH 8, and could treat the applied dye with the highest removal percentage as 84.2% at the lowest dye concentration (26.2 mg/L RB220). Increasing Gonium sp. biomass concentration from 0.21 to 0.53 g/L stimulated RB220 removal rate from 87.7% to 96.8%. The present study clearly indicated that Gonium sp. biomass could be used as a bioremediation biosorbent in treating RB220 dye in the related wastewaters.
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13
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Lv GY, Cheng JH, Chen XY, Zhang ZF, Fan LF. Biological decolorization of malachite green by Deinococcus radiodurans R1. BIORESOURCE TECHNOLOGY 2013; 144:275-280. [PMID: 23876656 DOI: 10.1016/j.biortech.2013.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2013] [Revised: 06/28/2013] [Accepted: 07/02/2013] [Indexed: 06/02/2023]
Abstract
Cultures of Deinococcus radiodurans R1 were observed to decolorize malachite green (MG) dye. The effects of various factors on decolorization efficiency were investigated. The optimal decolorization temperature and pH ranges were 25-50°C and 6.0-8.0, respectively. With increasing initial MG concentration, the decolorization efficiency decreased, and the kinetic parameters, R(MG,max) and K(m) were 416.7 mg-MG/g-cell/h and 1033.7 mg/L, respectively. The D. radiodurans R1 cells were capable of tolerating and rapidly degrading high concentrations of the dye. When MG concentration was 200 mg/L, decolorization efficiency was up to 97.2% within 30 min. The intermediate products of MG biodegradation were 4-(dimethylamino)phenol and 4-(dimethylamino)benzophenone, as identified by gas chromatography/mass spectrometry analysis. Toxicity tests indicated that D. radiodurans R1 did not detoxify an MG solution completely, but clearly reduced its toxicity. This study demonstrated that this strain was an efficient degrader compared to other microorganisms.
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Affiliation(s)
- Guo-Ying Lv
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
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