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Hernandez JA, Micus PS, Sunga SAL, Mazzei L, Ciurli S, Meloni G. Metal selectivity and translocation mechanism characterization in proteoliposomes of the transmembrane NiCoT transporter NixA from Helicobacter pylori. Chem Sci 2024; 15:651-665. [PMID: 38179545 PMCID: PMC10762997 DOI: 10.1039/d3sc05135h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 11/29/2023] [Indexed: 01/06/2024] Open
Abstract
Essential trace metals play key roles in the survival, replication, and virulence of bacterial pathogens. Helicobacter pylori (H. pylori), the main bacterial cause of gastric ulcers, requires Ni(ii) to colonize and persist in the acidic environment inside the stomach, exploiting the nickel-containing enzyme urease to catalyze the hydrolysis of urea to ammonia and bicarbonate and create a pH-buffered microenvironment. Urease utilizes Ni(ii) as a catalytic cofactor for its activity. In ureolytic bacteria, unique transmembrane (TM) transporters evolved to guarantee the selective uptake and efflux of Ni(ii) across cellular membranes to meet the cellular requirements. NixA is an essential Ni(ii) transporter expressed by H. pylori when the extracellular environment experiences a drop in pH. This Class I nickel-cobalt transporter of the NiCoT family catalyzes the uptake of Ni(ii) across the inner membrane from the periplasm. In this study, we characterized NixA using a platform whereby, for the first time on a NiCoT transporter, recombinantly expressed and purified NixA and key mutants in the translocation pathway have been reconstituted in artificial lipid bilayer vesicles (proteoliposomes). Fluorescent sensors responsive to Ni(ii) transport (Fluozin-3-Zn(ii)), luminal pH changes (pyranine), and membrane potential (oxonol VI) were encapsulated in the proteoliposomes lumen to monitor, in real-time, NixA transport properties and translocation mechanism. Kinetic transport analysis revealed that NixA is highly selective for Ni(ii) with no substrate promiscuity towards Co(ii), the other putative metal substrate of the NiCoT family, nor Zn(ii). NixA-mediated Ni(ii) transport exhibited a Michaelis-Menten-type saturable substrate concentration dependence, with an experimental KM, Ni(ii) = 31.0 ± 1.2 μM. Ni(ii) transport by NixA was demonstrated to be electrogenic, and metal translocation did not require a proton motive force, resulting in the generation of a positive-inside transmembrane potential in the proteoliposome lumen. Mutation analysis characterized key transmembrane residues for substrate recognition, binding, and/or transport, suggesting the presence of a three-step transmembrane translocation conduit. Taken together, these investigations reveal that NixA is a Ni(ii)-selective Class I NiCoT electrogenic uniporter. The work also provides an in vitro approach to characterize the transport properties of metal transporters responsible for Ni(ii) acquisition and extrusion in prokaryotes.
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Affiliation(s)
- Jayoh A Hernandez
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Paul S Micus
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Sean Alec Lois Sunga
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
| | - Luca Mazzei
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna Bologna I-40127 Italy
| | - Stefano Ciurli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna Bologna I-40127 Italy
| | - Gabriele Meloni
- Department of Chemistry and Biochemistry, The University of Texas at Dallas Richardson TX 75080 USA
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Li F, Xia A, Guo X, Huang Y, Zhu X, Zhu X, Liao Q. Immobilization of fatty acid photodecarboxylase in magnetic nickel ferrite nanoparticle. BIORESOURCE TECHNOLOGY 2023:129374. [PMID: 37352988 DOI: 10.1016/j.biortech.2023.129374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/18/2023] [Accepted: 06/19/2023] [Indexed: 06/25/2023]
Abstract
Fatty acid photodecarboxylase in Chlorella variabilis NC64A (CvFAP) performed excellent ability to exclusively decarboxylate renewable fatty acids for C1-shortened hydrocarbons fuel production under visible light. However, the large-scale application by such an approach is limited by the free state of CvFAP catalyst, which is unstable for efficient biofuel production. In this study, CvFAP was immobilized in magnetic nickel ferrite (NiFe2O4) nanoparticles for facile recovery by a simple procedure. The shift of Ni 2p in electron binding energy was detected to clarify the interaction between Ni2+ and histidine of CvFAP. The coordination of NiFe2O4 and CvFAP contributed to an efficient affinity binding with an immobilization capacity of 98 mg/g carrier. Hydrocarbon fuel concentration of 3.7 mM was obtained by NiFe2O4@CvFAP-induced photoenzymatic decarboxylation. The high stability of CvFAP in terms of residual enzyme activity of 79.7% and 68% at pH 9 and organic solvent ratio of 60%, respectively, were observed.
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Affiliation(s)
- Feng Li
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Ao Xia
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
| | - Xiaobo Guo
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Yun Huang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xianqing Zhu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xun Zhu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qiang Liao
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
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Thai TD, Lim W, Na D. Synthetic bacteria for the detection and bioremediation of heavy metals. Front Bioeng Biotechnol 2023; 11:1178680. [PMID: 37122866 PMCID: PMC10133563 DOI: 10.3389/fbioe.2023.1178680] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Accepted: 04/04/2023] [Indexed: 05/02/2023] Open
Abstract
Toxic heavy metal accumulation is one of anthropogenic environmental pollutions, which poses risks to human health and ecological systems. Conventional heavy metal remediation approaches rely on expensive chemical and physical processes leading to the formation and release of other toxic waste products. Instead, microbial bioremediation has gained interest as a promising and cost-effective alternative to conventional methods, but the genetic complexity of microorganisms and the lack of appropriate genetic engineering technologies have impeded the development of bioremediating microorganisms. Recently, the emerging synthetic biology opened a new avenue for microbial bioremediation research and development by addressing the challenges and providing novel tools for constructing bacteria with enhanced capabilities: rapid detection and degradation of heavy metals while enhanced tolerance to toxic heavy metals. Moreover, synthetic biology also offers new technologies to meet biosafety regulations since genetically modified microorganisms may disrupt natural ecosystems. In this review, we introduce the use of microorganisms developed based on synthetic biology technologies for the detection and detoxification of heavy metals. Additionally, this review explores the technical strategies developed to overcome the biosafety requirements associated with the use of genetically modified microorganisms.
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Adhikary A, Biswal S, Chatterjee D, Ghosh AS. A NiCoT family metal transporter of Mycobacterium tuberculosis (Rv2856/NicT) behaves as a drug efflux pump that facilitates cross-resistance to antibiotics. MICROBIOLOGY (READING, ENGLAND) 2022; 168. [PMID: 36282241 DOI: 10.1099/mic.0.001260] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Metals often act as a facilitator in the proliferation and persistence of antibiotic resistance. Efflux pumps play key roles in the co-selection of metal and antibiotic resistance. Here, we report the ability of a putative nickel/cobalt transporter (NiCoT family), Rv2856 or NicT of Mycobacterium tuberculosis (Mtb), to transport metal and antibiotics and identified some key amino acid residues that are important for its function. Ectopic expression of NicT in Escherichia coli CS109 resulted in the increase of intracellular nickel uptake. Additionally, enhanced tolerance towards several antibiotics (norfloxacin, sparfloxacin, ofloxacin, gentamicin, nalidixic acid and isoniazid) was observed with NicT overexpression in E. coli and Mycobacterium smegmatis. A comparatively lower intracellular accumulation of norfloxacin upon NicT overexpression than that of the cells without NicT indicated the involvement of NicT in an active efflux process. Although expression of NicT did not alter the sensitivity towards kanamycin, doxycycline, tetracycline, apramycin, neomycin and ethambutol, the presence of a sub-inhibitory dose of Ni2+ resulted in the manifestation of low-level tolerance towards these drugs. Further, substitution of four residues (H77I, D82I, H83L and D227I) in the conserved regions of NicT by isoleucine and leucine resulted in reduced to nearly complete loss of the transport function for both metals and antimicrobials. Therefore, the study suggests that nickel transporter Rv2856/NicT may actively export different drugs and the presence of nickel might drive the cross-resistance to some of the antibiotics.
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Affiliation(s)
- Anwesha Adhikary
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India
| | - Sarmistha Biswal
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India
| | - Debasmita Chatterjee
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India
| | - Anindya S Ghosh
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal-721302, India
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Sharma P, Parakh SK, Singh SP, Parra-Saldívar R, Kim SH, Varjani S, Tong YW. A critical review on microbes-based treatment strategies for mitigation of toxic pollutants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 834:155444. [PMID: 35461941 DOI: 10.1016/j.scitotenv.2022.155444] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/31/2022] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Contamination of the environment through toxic pollutants poses a key risk to the environment due to irreversible environmental damage(s). Industrialization and urbanization produced harmful elements such as petrochemicals, agrochemicals, pharmaceuticals, nanomaterials, and herbicides that are intentionally or unintentionally released into the water system, threatening biodiversity, the health of animals, and humans. Heavy metals (HMs) in water, for example, can exist in a variety of forms that are inclined by climate features like the presence of various types of organic matter, pH, water system hardness, transformation, and bioavailability. Biological treatment is an important tool for removing toxic contaminants from the ecosystem, and it has piqued the concern of investigators over the centuries. In situ bioremediation such as biosparging, bioventing, biostimulation, bioaugmentation, and phytoremediation and ex-situ bioremediation includes composting, land farming, biopiles, and bioreactors. In the last few years, scientific understanding of microbial relations with particular chemicals has aided in the protection of the environment. Despite intensive studies being carried out on the mitigation of toxic pollutants, there have been limited efforts performed to discuss the solutions to tackle the limitations and approaches for the remediation of heavy metals holistically. This paper summarizes the risk assessment of HMs on aquatic creatures, the environment, humans, and animals. The content of this paper highlights the principles and limitations of microbial remediation to address the technological challenges. The coming prospect and tasks of evaluating the impact of different treatment skills for pollutant remediation have been reviewed in detail. Moreover, genetically engineered microbes have emerged as powerful bioremediation capabilities with significant potential for expelling toxic elements. With appropriate examples, current challenging issues and boundaries related to the deployment of genetically engineered microbes as bioremediation on polluted soils are emphasized.
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Affiliation(s)
- Pooja Sharma
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 CREATE Way, 138602, Singapore
| | - Sheetal Kishor Parakh
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 CREATE Way, 138602, Singapore
| | - Surendra Pratap Singh
- Plant Molecular Biology Laboratory, Department of Botany, Dayanand Anglo-Vedic (PG) College, Chhatrapati Shahu Ji Maharaj University, Kanpur-208001, India
| | - Roberto Parra-Saldívar
- Escuela de Ingeniería y Ciencias-Centro de Biotecnología-FEMSA, Tecnológico de Monterrey, Campus Monterrey, Mexico
| | - Sang-Hyoun Kim
- School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Sunita Varjani
- Gujarat Pollution Control Board, Gandhinagar 382010, Gujarat, India.
| | - Yen Wah Tong
- Environmental Research Institute, National University of Singapore, 1 Create Way, 138602, Singapore; Energy and Environmental Sustainability for Megacities (E2S2) Phase II, Campus for Research Excellence and Technological Enterprise (CREATE), 1 CREATE Way, 138602, Singapore; Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive, 117585, Singapore.
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6
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Malik G, Arora R, Chaturvedi R, Paul MS. Implementation of Genetic Engineering and Novel Omics Approaches to Enhance Bioremediation: A Focused Review. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 108:443-450. [PMID: 33837794 DOI: 10.1007/s00128-021-03218-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
Bioremediation itself is considered to be a cost effective soil clean-up technique and preferred over invasive physical and chemical treatments. Besides increasing efficiency, application of genetic engineering has led to reduction in the time duration required to achieve remediation, overcoming the so called 'Achilles heel' of Bioremediation. Omics technologies, namely genomics, transcriptomics, proteomics, and metabolomics, are being employed extensively to gain insights at genetic level. A wise synchronised application of these approaches can help scrutinize complex metabolic pathways, and molecular changes in response to heavy metal stress, and also its fate i.e., uptake, transport, sequestration and detoxification. In the present review, an account of some latest achievements made in the field is presented.
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Affiliation(s)
| | - Rahul Arora
- The Francis Crick Institute, London, United Kingdom
- Division of Biosciences, University College London, London, United Kingdom
| | | | - Manoj S Paul
- Department of Botany, St. John's College, Agra, U.P, India
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7
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Arora PK. Bacilli-Mediated Degradation of Xenobiotic Compounds and Heavy Metals. Front Bioeng Biotechnol 2020; 8:570307. [PMID: 33163478 PMCID: PMC7581956 DOI: 10.3389/fbioe.2020.570307] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Accepted: 08/27/2020] [Indexed: 11/13/2022] Open
Abstract
Xenobiotic compounds are man-made compounds and widely used in dyes, drugs, pesticides, herbicides, insecticides, explosives, and other industrial chemicals. These compounds have been released into our soil and water due to anthropogenic activities and improper waste disposal practices and cause serious damage to aquatic and terrestrial ecosystems due to their toxic nature. The United States Environmental Protection Agency (USEPA) has listed several toxic substances as priority pollutants. Bacterial remediation is identified as an emerging technique to remove these substances from the environment. Many bacterial genera are actively involved in the degradation of toxic substances. Among the bacterial genera, the members of the genus Bacillus have a great potential to degrade or transform various toxic substances. Many Bacilli have been isolated and characterized by their ability to degrade or transform a wide range of compounds including both naturally occurring substances and xenobiotic compounds. This review describes the biodegradation potentials of Bacilli toward various toxic substances, including 4-chloro-2-nitrophenol, insecticides, pesticides, herbicides, explosives, drugs, polycyclic aromatic compounds, heavy metals, azo dyes, and aromatic acids. Besides, the advanced technologies used for bioremediation of environmental pollutants using Bacilli are also briefly described. This review will increase our understanding of Bacilli-mediated degradation of xenobiotic compounds and heavy metals.
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Affiliation(s)
- Pankaj Kumar Arora
- Department of Microbiology, Babasaheb Bhimrao Ambedkar University, Lucknow, India
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8
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Narendrula-Kotha R, Theriault G, Mehes-Smith M, Kalubi K, Nkongolo K. Metal Toxicity and Resistance in Plants and Microorganisms in Terrestrial Ecosystems. REVIEWS OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2020; 249:1-27. [PMID: 30725190 DOI: 10.1007/398_2018_22] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Metals are major abiotic stressors of many organisms, but their toxicity in plants is not as studied as in microorganisms and animals. Likewise, research in plant responses to metal contamination is sketchy. Candidate genes associated with metal resistance in plants have been recently discovered and characterized. Some mechanisms of plant adaptation to metal stressors have been now decrypted. New knowledge on microbial reaction to metal contamination and the relationship between bacterial, archaeal, and fungal resistance to metals has broadened our understanding of metal homeostasis in living organisms. Recent reviews on metal toxicity and resistance mechanisms focused only on the role of transcriptomics, proteomics, metabolomics, and ionomics. This review is a critical analysis of key findings on physiological and genetic processes in plants and microorganisms in responses to soil metal contaminations.
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Affiliation(s)
| | - Gabriel Theriault
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON, Canada
| | | | - Kersey Kalubi
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON, Canada
| | - Kabwe Nkongolo
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON, Canada.
- Department of Biology, Laurentian University, Sudbury, ON, Canada.
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9
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Zhu B, Chen Y, Wei N. Engineering Biocatalytic and Biosorptive Materials for Environmental Applications. Trends Biotechnol 2019; 37:661-676. [DOI: 10.1016/j.tibtech.2018.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 11/07/2018] [Accepted: 11/08/2018] [Indexed: 10/27/2022]
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Czajka KM, Michael P, Nkongolo K. Differential effects of nickel dosages on in vitro and in vivo seed germination and expression of a high affinity nickel-transport family protein (AT2G16800) in trembling aspen (Populus tremuloides). ECOTOXICOLOGY (LONDON, ENGLAND) 2019; 28:92-102. [PMID: 30552523 DOI: 10.1007/s10646-018-2003-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
It has been demonstrated that a number of metals including mercury (Hg), zinc (Zn), cadmium (Cd), cobalt (Co), lead (Pb), copper (Cu), and nickel (Ni) decrease seed germination rates and plant growth. The threshold levels of metal toxicity on seed germination, plant development, and gene regulation have not been studied in detail. The main objective of this study was to assess in vitro and in vivo the effects of different doses of nickel on Trembling aspen (Populus tremuloides) seed germination and regulation of the high affinity nickel transporter family protein (AT2G16800) gene. The in vitro assays showed that Nickel completely inhibited seed germination even at the lowest concentration of 0.401 mg Ni per mL (in media) tested. However, when the same concentration of nickel (150 mg Ni per 1 kg of dry soil) was added to soil samples, during the vivo assays, almost all of the seeds germinated. Significant inhibition of seed germination was observed when soil samples were treated with at least 400 mg/kg of Ni. No damages were observed on growing seedlings treated with 150, 400, and 800 mg/kg of Ni. Only the highest dose of 1, 600 mg/kg resulted in visible leaf and stem damages and reduced growth on 75% of seedlings. A significant repression of the AT2G16800 gene was observed for the 400, 800, and 1600 mg/kg of nickel treatments compared to the water control with the lowest level of expression observed in samples treated with 800 mg/kg of Ni. Results of this study suggest that P. tremuloides populations will likely be sustainable for long term in sites that are highly contaminated with Ni including mining regions since the bioavailable amount of this metal is usually below 400 mg/kg in Canada.
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Affiliation(s)
- Karolina M Czajka
- Department of Biology, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
| | - Paul Michael
- Biomolecular Sciences Program, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
| | - Kabwe Nkongolo
- Department of Biology, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada.
- Biomolecular Sciences Program, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada.
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Diep P, Mahadevan R, Yakunin AF. Heavy Metal Removal by Bioaccumulation Using Genetically Engineered Microorganisms. Front Bioeng Biotechnol 2018; 6:157. [PMID: 30420950 PMCID: PMC6215804 DOI: 10.3389/fbioe.2018.00157] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 10/09/2018] [Indexed: 11/25/2022] Open
Abstract
Wastewater effluents from mines and metal refineries are often contaminated with heavy metal ions, so they pose hazards to human and environmental health. Conventional technologies to remove heavy metal ions are well-established, but the most popular methods have drawbacks: chemical precipitation generates sludge waste, and activated carbon and ion exchange resins are made from unsustainable non-renewable resources. Using microbial biomass as the platform for heavy metal ion removal is an alternative method. Specifically, bioaccumulation is a natural biological phenomenon where microorganisms use proteins to uptake and sequester metal ions in the intracellular space to utilize in cellular processes (e.g., enzyme catalysis, signaling, stabilizing charges on biomolecules). Recombinant expression of these import-storage systems in genetically engineered microorganisms allows for enhanced uptake and sequestration of heavy metal ions. This has been studied for over two decades for bioremediative applications, but successful translation to industrial-scale processes is virtually non-existent. Meanwhile, demands for metal resources are increasing while discovery rates to supply primary grade ores are not. This review re-thinks how bioaccumulation can be used and proposes that it can be developed for bioextractive applications-the removal and recovery of heavy metal ions for downstream purification and refining, rather than disposal. This review consolidates previously tested import-storage systems into a biochemical framework and highlights efforts to overcome obstacles that limit industrial feasibility, thereby identifying gaps in knowledge and potential avenues of research in bioaccumulation.
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Affiliation(s)
| | | | - Alexander F. Yakunin
- BioZone - Centre for Applied Biosciences and Bioengineering, Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, Canada
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12
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Djeukam CL, Nkongolo K. Expression of Genes Associated with Nickel Resistance in Red Oak (Quercus rubra) Populations from a Metal Contaminated Region. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2018; 100:792-797. [PMID: 29569061 DOI: 10.1007/s00128-018-2328-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 03/19/2018] [Indexed: 06/08/2023]
Abstract
Although many studies have reported mechanisms of resistance to metals in herbaceous species, there is very little information on metal coping strategy in hardwood species such as Quercus rubra. The main objective of this study was to determine the expression of genes associated with nickel resistance in red oak (Q. rubra) populations from metal contaminated and uncontaminated sites in the Northern Ontario. Six genes associated with nickel resistances in model and non-model plants were targeted. Differential expressions of these genes were observed in Q. rubra from all the sites, but association between metal contamination and gene expression was not established. This suggests that the bioavailable amounts of metals found in metal contaminated soils in mining sites in northern Ontario and likely in many mining regions around the world cannot trigger a genetic response in higher plant species.
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Affiliation(s)
| | - Kabwe Nkongolo
- Department of Biology, Laurentian University, Sudbury, ON, P3E 2C6, Canada.
- Biomolecular Sciences Program, Laurentian University, Sudbury, ON, P3E 2C6, Canada.
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13
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Liu B, Wang C, Liu D, He N, Deng X. Hg tolerance and biouptake of an isolated pigmentation yeast Rhodotorula mucilaginosa. PLoS One 2017; 12:e0172984. [PMID: 28253367 PMCID: PMC5333980 DOI: 10.1371/journal.pone.0172984] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 02/13/2017] [Indexed: 11/18/2022] Open
Abstract
A pigmented yeast R1 with strong tolerance to Hg2+ was isolated. Phylogenetic identification based on the analysis of 26S rDNA and ITS revealed R1 is a Rhodotorula mucilaginosa species. R1 was able to grow in the presence of 80 mg/L Hg2+, but the lag phase was much prolonged compared to its growth in the absence of Hg2+. The maximum Hg2+ binding capacity of R1 was 69.9 mg/g, and dead cells could bind 15% more Hg2+ than living cells. Presence of organic substances drastically reduced bioavailability of Hg2+ and subsequently decreased Hg2+ removal ratio from aqueous solution, but this adverse effect could be remarkably alleviated by the simultaneous process of cell propagation and Hg2+ biouptake with actively growing R1. Furthermore, among the functional groups involved in Hg2+ binding, carboxyl group contributed the most, followed by amino & hydroxyl group and phosphate group. XPS analysis disclosed the mercury species bound on yeast cells was HgCl2 rather than HgO or Hg0.
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Affiliation(s)
- Bing Liu
- College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Ecology, Shenzhen University, Shenzhen, China
| | - Chaogang Wang
- College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Ecology, Shenzhen University, Shenzhen, China
| | - Danxia Liu
- College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Ecology, Shenzhen University, Shenzhen, China
| | - Ning He
- Department of Chemical/Biochemical Engineering, Xiamen University, Xiamen, China
| | - Xu Deng
- College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Ecology, Shenzhen University, Shenzhen, China
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14
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Theriault G, Michael P, Nkongolo K. Decrypting the regulation and mechanism of nickel resistance in white birch (Betula papyrifera) using cross-species metal-resistance genes. Genes Genomics 2016. [DOI: 10.1007/s13258-016-0387-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Gogada R, Singh SS, Lunavat SK, Pamarthi MM, Rodrigue A, Vadivelu B, Phanithi PB, Gopala V, Apte SK. Engineered Deinococcus radiodurans R1 with NiCoT genes for bioremoval of trace cobalt from spent decontamination solutions of nuclear power reactors. Appl Microbiol Biotechnol 2015; 99:9203-13. [DOI: 10.1007/s00253-015-6761-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/12/2015] [Accepted: 06/08/2015] [Indexed: 11/30/2022]
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Duprey A, Chansavang V, Frémion F, Gonthier C, Louis Y, Lejeune P, Springer F, Desjardin V, Rodrigue A, Dorel C. "NiCo Buster": engineering E. coli for fast and efficient capture of cobalt and nickel. J Biol Eng 2014; 8:19. [PMID: 25104972 PMCID: PMC4124493 DOI: 10.1186/1754-1611-8-19] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 07/13/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Metal contamination is widespread and results from natural geogenic and constantly increasing anthropogenic sources (mainly mining and extraction activities, electroplating, battery and steel manufacturing or metal finishing). Consequently, there is a growing need for methods to detoxify polluted ecosystems. Industrial wastewater, surface water and ground water need to be decontaminated to alleviate the contamination of soils and sediments and, ultimately, the human food chain. In nuclear power plants, radioactive metals are produced; these metals need to be removed from effluents before they are released into the environment, not only for pollution prevention but also for waste minimization. Many physicochemical methods have been developed for metal removal from aqueous solutions, including chemical coagulation, adsorption, extraction, ion exchange and membrane separation; however, these methods are generally not metal selective. Bacteria, because they contain metal transporters, provide a potentially competitive alternative to the current use of expensive and high-volume ion-exchange resins. RESULTS The feasibility of using bacterial biofilters as efficient tools for nickel and cobalt ions specific remediation was investigated. Among the factors susceptible to genetic modification in Escherichia coli, specific efflux and sequestration systems were engineered to improve its metal sequestration abilities. Genomic suppression of the RcnA nickel (Ni) and cobalt (Co) efflux system was combined with the plasmid-controlled expression of a genetically improved version of a specific metallic transporter, NiCoT, which originates from Novosphingobium aromaticivorans. The resulting strain exhibited enhanced nickel (II) and cobalt (II) uptake, with a maximum metal ion accumulation of 6 mg/g bacterial dry weight during 10 min of treatment. A synthetic adherence operon was successfully introduced into the plasmid carrying the improved NiCoT transporter, conferring the ability to form thick biofilm structures, especially when exposed to nickel and cobalt metallic compounds. CONCLUSIONS This study demonstrates the efficient use of genetic engineering to increase metal sequestration and biofilm formation by E. coli. This method allows Co and Ni contaminants to be sequestered while spatially confining the bacteria to an abiotic support. Biofiltration of nickel (II) and cobalt (II) by immobilized cells is therefore a promising option for treating these contaminants at an industrial scale.
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Affiliation(s)
- Alexandre Duprey
- iGEM team INSA Lyon, Plateforme de Biologie de Synthèse, Département Biosciences, INSA Lyon, 69621 Villeurbanne Cedex, France.,Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon I, CNRS, MAP, UMR5240, Villeurbanne F-69621, France
| | - Viviane Chansavang
- iGEM team INSA Lyon, Plateforme de Biologie de Synthèse, Département Biosciences, INSA Lyon, 69621 Villeurbanne Cedex, France
| | - Franck Frémion
- iGEM team INSA Lyon, Plateforme de Biologie de Synthèse, Département Biosciences, INSA Lyon, 69621 Villeurbanne Cedex, France
| | - Clémence Gonthier
- iGEM team INSA Lyon, Plateforme de Biologie de Synthèse, Département Biosciences, INSA Lyon, 69621 Villeurbanne Cedex, France
| | - Yoann Louis
- Université de Lyon, INSA-Lyon, LGCIE, Villeurbanne F-69621, France
| | - Philippe Lejeune
- Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon I, CNRS, MAP, UMR5240, Villeurbanne F-69621, France
| | - Fanny Springer
- Université de Lyon, INSA-Lyon, LGCIE, Villeurbanne F-69621, France
| | | | - Agnès Rodrigue
- Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon I, CNRS, MAP, UMR5240, Villeurbanne F-69621, France
| | - Corinne Dorel
- Université de Lyon, INSA-Lyon, LGCIE, Villeurbanne F-69621, France
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Won SW, Kotte P, Wei W, Lim A, Yun YS. Biosorbents for recovery of precious metals. BIORESOURCE TECHNOLOGY 2014; 160:203-212. [PMID: 24565873 DOI: 10.1016/j.biortech.2014.01.121] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 01/27/2014] [Accepted: 01/30/2014] [Indexed: 06/03/2023]
Abstract
Biosorption is a promising technology not only for the removal of heavy metals and dyes but also for the recovery of precious metals (PMs) from solution phases. The biosorptive recovery of PMs from waste solutions and secondary resources is recently getting paid attractive attention because their price is increasing or fluctuating, their available deposit is limited and maldistributed, and high-tech industries need more consumption of PMs. The biosorbents for recovery of PMs require specifications which differ from those for the treatment of wastewaters containing heavy metals and dyes. In this review, the previous works on biosorbents and biosorption for recovery of PMs were summarized. Especially, we discuss and suggest the required specifications of biosorbents for recovery of PMs and strategies to give the required properties to the biosorbents. We believe this review will provide useful information to scientists and engineers and hope to give insights into this research frontier.
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Affiliation(s)
- Sung Wook Won
- Department of Marine Environmental Engineering and Institute of Marine Industry, Gyeongsang National University, 38 Cheondaegukchi-gil, Tongyeong, Gyeongnam 650-160, Republic of Korea
| | - Pratap Kotte
- School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Wei Wei
- School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Areum Lim
- Department of Bioprocess Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea
| | - Yeoung-Sang Yun
- School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea; Department of Bioprocess Engineering, Chonbuk National University, Jeonju, Jeonbuk 561-756, Republic of Korea.
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