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Rojano-Nisimura AM, Grismore KB, Ruzek JS, Avila JL, Contreras LM. The Post-Transcriptional Regulatory Protein CsrA Amplifies Its Targetome through Direct Interactions with Stress-Response Regulatory Hubs: The EvgA and AcnA Cases. Microorganisms 2024; 12:636. [PMID: 38674581 PMCID: PMC11052181 DOI: 10.3390/microorganisms12040636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/08/2024] [Accepted: 03/19/2024] [Indexed: 04/28/2024] Open
Abstract
Global rewiring of bacterial gene expressions in response to environmental cues is mediated by regulatory proteins such as the CsrA global regulator from E. coli. Several direct mRNA and sRNA targets of this protein have been identified; however, high-throughput studies suggest an expanded RNA targetome for this protein. In this work, we demonstrate that CsrA can extend its network by directly binding and regulating the evgA and acnA transcripts, encoding for regulatory proteins. CsrA represses EvgA and AcnA expression and disrupting the CsrA binding sites of evgA and acnA, results in broader gene expression changes to stress response networks. Specifically, altering CsrA-evgA binding impacts the genes related to acidic stress adaptation, and disrupting the CsrA-acnA interaction affects the genes involved in metal-induced oxidative stress responses. We show that these interactions are biologically relevant, as evidenced by the improved tolerance of evgA and acnA genomic mutants depleted of CsrA binding sites when challenged with acid and metal ions, respectively. We conclude that EvgA and AcnA are intermediate regulatory hubs through which CsrA can expand its regulatory role. The indirect CsrA regulation of gene networks coordinated by EvgA and AcnA likely contributes to optimizing cellular resources to promote exponential growth in the absence of stress.
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Affiliation(s)
| | - Kobe B. Grismore
- McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E. Dean Keeton St. Stop C0400, Austin, TX 78712, USA; (K.B.G.); (J.S.R.); (J.L.A.)
| | - Josie S. Ruzek
- McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E. Dean Keeton St. Stop C0400, Austin, TX 78712, USA; (K.B.G.); (J.S.R.); (J.L.A.)
| | - Jacqueline L. Avila
- McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E. Dean Keeton St. Stop C0400, Austin, TX 78712, USA; (K.B.G.); (J.S.R.); (J.L.A.)
| | - Lydia M. Contreras
- Department of Molecular Biosciences, The University of Texas at Austin, 100 East 24th St. Stop A5000, Austin, TX 78712, USA;
- McKetta Department of Chemical Engineering, The University of Texas at Austin, 200 E. Dean Keeton St. Stop C0400, Austin, TX 78712, USA; (K.B.G.); (J.S.R.); (J.L.A.)
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Edward CJ, Smart M, Kotsiopoulos A, Harrison STL. Sulfur oxidation kinetics of Acidithiobacillus caldus and its inhibition on exposure to thiocyanate present in cyanidation tailings wastewater. Res Microbiol 2024; 175:104134. [PMID: 37777032 DOI: 10.1016/j.resmic.2023.104134] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 08/28/2023] [Accepted: 08/30/2023] [Indexed: 10/02/2023]
Abstract
The sulfur oxidation kinetics of an industrial strain of Acidithiobacillus caldus (At. caldus) cultured on elemental sulfur was explored in batch experiments in the absence and presence of thiocyanate (SCN-), a toxin inherent within cyanidation tailings wastewater. The Contois rate expression accurately described At. caldus sulfate generation (R2 > 0.93) and microbial growth (R2 > 0.87). For a culture maintained at 45 °C a maximum specific growth rate (μmax) of 0.105 h-1, sulfate yield from biomass (Ypx) of 4.8 × 10-9 mg SO42-.cell-1, and Contois affinity coefficient (Kx) of 1.56 × 10-8 mg S.cell-1 were established. The presence of SCN- (0 mg/L - 20 mg/L) in the bulk solution inhibited the microbial system competitively. Moreover, SCN- impeded microbial growth differentially; the rate expression was therefore partitioned with respect to SCN- concentration and inhibition constants (Ki) were determined for each region. Adaptation to discrete concentrations of SCN- (1 mg/L and 20 mg/L) improved SCN- tolerance in At. caldus; however, adapted strains exhibited reduced sulfur oxidation potential when cultured under thiocyanate-free conditions relative to the non-adapted control strain. To describe the adapted systems accurately, the Contois affinity coefficient (Kx) was revised to reflect the suspected metabolic decline. The derived Kx values increased in magnitude and affirmed an innate reduction in microbial substrate affinity or substrate adsorption capacity. Inclusion of these updated Kx constants within the rate equation suitably represented the experimental data for both adapted At. caldus strains with R2 > 0.94. Furthermore, the impact of adaptation on the inhibition kinetics and inhibition mechanism associated with SCN- exposure were reviewed. Thiocyanate inhibited sulfur oxidation non-competitively in the adapted strains, and the shift in inhibition mechanism may be attributed to the compromised metabolic state following adaptation.
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Affiliation(s)
- Catherine J Edward
- Centre for Bioprocess Engineering Research (CeBER), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa.
| | - Mariette Smart
- Centre for Bioprocess Engineering Research (CeBER), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
| | - Athanasios Kotsiopoulos
- Centre for Bioprocess Engineering Research (CeBER), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
| | - Susan T L Harrison
- Centre for Bioprocess Engineering Research (CeBER), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
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3
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Manesh MJH, Willard DJ, Lewis AM, Kelly RM. Extremely thermoacidophilic archaea for metal bioleaching: What do their genomes tell Us? BIORESOURCE TECHNOLOGY 2024; 391:129988. [PMID: 37949149 DOI: 10.1016/j.biortech.2023.129988] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 11/12/2023]
Abstract
Elevated temperatures favor bioleaching processes through faster kinetics, more favorable mineral chemistry, lower cooling requirements, and less surface passivation. Extremely thermoacidophilic archaea from the order Sulfolobales exhibit novel mechanisms for bioleaching metals from ores and have great potential. Genome sequences of many extreme thermoacidophiles are now available and provide new insights into their biochemistry, metabolism, physiology and ecology as these relate to metal mobilization from ores. Although there are some molecular genetic tools available for extreme thermoacidophiles, further development of these is sorely needed to advance the study and application of these archaea for bioleaching applications. The evolving landscape for bioleaching technologies at high temperatures merits a closer look through a genomic lens at what is currently possible and what lies ahead in terms of new developments and emerging opportunities. The need for critical metals and the diminishing primary deposits for copper should provide incentives for high temperature bioleaching.
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Affiliation(s)
- Mohamad J H Manesh
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA
| | - Daniel J Willard
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA
| | - April M Lewis
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA
| | - Robert M Kelly
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA.
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4
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Sarkodie EK, Jiang L, Li K, Yang J, Guo Z, Shi J, Deng Y, Liu H, Jiang H, Liang Y, Yin H, Liu X. A review on the bioleaching of toxic metal(loid)s from contaminated soil: Insight into the mechanism of action and the role of influencing factors. Front Microbiol 2022; 13:1049277. [PMID: 36569074 PMCID: PMC9767989 DOI: 10.3389/fmicb.2022.1049277] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 11/18/2022] [Indexed: 12/12/2022] Open
Abstract
The anthropogenic activities in agriculture, industrialization, mining, and metallurgy combined with the natural weathering of rocks, have led to severe contamination of soils by toxic metal(loid)s. In an attempt to remediate these polluted sites, a plethora of conventional approaches such as Solidification/Stabilization (S/S), soil washing, electrokinetic remediation, and chemical oxidation/reduction have been used for the immobilization and removal of toxic metal(loid)s in the soil. However, these conventional methods are associated with certain limitations. These limitations include high operational costs, high energy demands, post-waste disposal difficulties, and secondary pollution. Bioleaching has proven to be a promising alternative to these conventional approaches in removing toxic metal(loid)s from contaminated soil as it is cost-effective, environmentally friendly, and esthetically pleasing. The bioleaching process is influenced by factors including pH, temperature, oxygen, and carbon dioxide supply, as well as nutrients in the medium. It is crucial to monitor these parameters before and throughout the reaction since a change in any, for instance, pH during the reaction, can alter the microbial activity and, therefore, the rate of metal leaching. However, research on these influencing factors and recent innovations has brought significant progress in bioleaching over the years. This critical review, therefore, presents the current approaches to bioleaching and the mechanisms involved in removing toxic metal(loid)s from contaminated soil. We further examined and discussed the fundamental principles of various influencing factors that necessitate optimization in the bioleaching process. Additionally, the future perspectives on adding omics for bioleaching as an emerging technology are discussed.
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Affiliation(s)
- Emmanuel Konadu Sarkodie
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Luhua Jiang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Kewei Li
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Jiejie Yang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Ziwen Guo
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Jiaxin Shi
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Yan Deng
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Hongwei Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Huidan Jiang
- Hunan Agricultural Biotechnology Research Institute, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Yili Liang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, China
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5
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Li J, Yang H, Tong L, Liu Z, Jin Z, Chen G. Effects of Mineral Salts on the Activity and Composition of a Mixed Culture of Acidophilic Microorganisms. Microbiology (Reading) 2021. [DOI: 10.1134/s0026261722010088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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6
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Importance of Initial Interfacial Steps during Chalcopyrite Bioleaching by a Thermoacidophilic Archaeon. Microorganisms 2020; 8:microorganisms8071009. [PMID: 32640593 PMCID: PMC7409349 DOI: 10.3390/microorganisms8071009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/16/2020] [Accepted: 06/16/2020] [Indexed: 12/28/2022] Open
Abstract
Studies of thermophilic microorganisms have shown that they have a considerable biotechnological potential due to their optimum growth and metabolism at high temperatures. Thermophilic archaea have unique characteristics with important biotechnological applications; many of these species could be used in bioleaching processes to recover valuable metals from mineral ores. Particularly, bioleaching at high temperatures using thermoacidophilic microorganisms can greatly improve metal solubilization from refractory mineral species such as chalcopyrite (CuFeS2), one of the most abundant and widespread copper-bearing minerals. Interfacial processes such as early cell adhesion, biofilm development, and the formation of passive layers on the mineral surface play important roles in the initial steps of bioleaching processes. The present work focused on the investigation of different bioleaching conditions using the thermoacidophilic archaeon Acidianus copahuensis DSM 29038 to elucidate which steps are pivotal during the chalcopyrite bioleaching. Fluorescent in situ hybridization (FISH) and confocal laser scanning microscopy (CLSM) were used to visualize the microorganism–mineral interaction. Results showed that up to 85% of copper recovery from chalcopyrite could be achieved using A. copahuensis. Improvements in these yields are intimately related to an early contact between cells and the mineral surface. On the other hand, surface coverage by inactivated cells as well as precipitates significantly reduced copper recoveries.
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Liu X, Liu H, Wu W, Zhang X, Gu T, Zhu M, Tan W. Oxidative Stress Induced by Metal Ions in Bioleaching of LiCoO 2 by an Acidophilic Microbial Consortium. Front Microbiol 2020; 10:3058. [PMID: 32010108 PMCID: PMC6974807 DOI: 10.3389/fmicb.2019.03058] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Accepted: 12/18/2019] [Indexed: 12/13/2022] Open
Abstract
An acidophilic microbial consortium (AMC) was used to investigate the fundamental mechanism behind the adverse effects of pulp density increase in the bioleaching of waste lithium ion batteries (WLIBs). Results showed that there existed the effect of metal-ion stress on the bio-oxidative activity of AMC. The Li+ and Co2+ accumulated in the leachate were the direct cause for the decrease in lithium and cobalt recovery yields under a high pulp density. In a simulated bioleaching system with 4.0% (w ⋅v-1) LiCoO2, the intracellular reactive oxygen species (ROS) content in AMC increased from 0.82 to 6.02 within 24 h, which was almost three times higher than that of the control (2.04). After the supplementation of 0.30 g⋅L-1 of exogenous glutathione (GSH), the bacterial intracellular ROS content decreased by 40% within 24 h and the activities of intracellular ROS scavenging enzymes, including glutathione peroxidase (GSH-Px) and catalase (CAT), were 1.4- and 2.0-folds higher in comparison with the control within 24 h. In the biofilms formed on pyrite in the bioleaching of WLIBs, it was found that metal-ion stress had a great influence on the 3-D structure and the amount of biomass of the biofilms. After the exogenous addition of GSH, the structure and the amount of biomass of the biofilms were restored to some extent. Eventually, through ROS regulation by the exogenous addition of GSH, very high metal recovery yields of 98.1% Li and 96.3% Co were obtained at 5.0% pulp density.
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Affiliation(s)
- Xiaocui Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Hao Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Weijin Wu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Xu Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Tingyue Gu
- Department of Chemical and Biomolecular Engineering, Ohio University, Athens, OH, United States
| | - Minglong Zhu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Wensong Tan
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
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8
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Tang D, Gao Q, Zhao Y, Li Y, Chen P, Zhou J, Xu R, Wu Z, Xu Y, Li H. Mg2+ reduces biofilm quantity in Acidithiobacillus ferrooxidans through inhibiting Type IV pili formation. FEMS Microbiol Lett 2019; 365:4835517. [PMID: 29408987 DOI: 10.1093/femsle/fnx266] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 12/06/2017] [Indexed: 11/14/2022] Open
Abstract
Bioleaching is a promising process for 350 million tons of Jinchuan low-grade pentlandite. But high concentration of Mg2+ is harmful to bioleaching microorganisms. Interestingly, biofilm formation can improve leaching rate. Thus, it is actually necessary to investigate the effect of Mg2+ stress on Acidithiobacillus ferrooxidans biofilms formation. In this study, we found that 0.1 and 0.5 M Mg2+ stress significantly reduced the total biomass of biofilm in a dose-dependent manner. The observation results of extracellular polymeric substances and bacteria using confocal laser scanning microscopy showed that the biofilm became thinner and looser under Mg2+ stress. Whereas 0.1 and 0.5 M Mg2+ stress had no remarkable effect on the bacterial viability, the attachment rate of Acidithiobacillus ferrooxidans to pentlandite was reduced by Mg2+ stress. Furthermore, sliding motility, twitching motility and the gene expression level of pilV and pilW were inhibited under Mg2+ stress. These results suggested that Mg2+ reduced biofilm formation through inhibiting pilV and pilW gene expression, decreasing Type IV pili formation and then attenuating the ability of attachment, subduing the active expansion of biofilms mediated by twitching motility. This study provided more information about the effect of Mg2+ stress on biofilm formation and may be useful for increasing the leaching rate in low-grade pentlandit.
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Affiliation(s)
- Deping Tang
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China.,The School of Chemical & Biological Engineering, Lanzhou Jiaotong University, West Anning Road No. 88, Lanzhou 730070, PR China
| | - Qiyu Gao
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China
| | - Yang Zhao
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China
| | - Yang Li
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
| | - Peng Chen
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
| | - Jianping Zhou
- Institute of Biology, Gansu Academy of Sciences, South Dingxi Road No. 229, Lanzhou 730000, PR China
| | - Ruixiang Xu
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
| | - Zhengrong Wu
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
| | - Yuandong Xu
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
| | - Hongyu Li
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou 730000, PR China.,Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou 730020, PR China
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9
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Khaleque HN, González C, Kaksonen AH, Boxall NJ, Holmes DS, Watkin ELJ. Genome-based classification of two halotolerant extreme acidophiles, Acidihalobacter prosperus V6 (=DSM 14174 =JCM 32253) and 'Acidihalobacter ferrooxidans' V8 (=DSM 14175 =JCM 32254) as two new species, Acidihalobacter aeolianus sp. nov. and Acidihalobacter ferrooxydans sp. nov., respectively. Int J Syst Evol Microbiol 2019; 69:1557-1565. [DOI: 10.1099/ijsem.0.003313] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Himel N. Khaleque
- 1School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, Australia
- 2CSIRO Land and Water, Floreat, Australia
| | - Carolina González
- 3Center for Bioinformatics and Genome Biology, Fundacion Ciencia y Vida and Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile
| | | | | | - David S. Holmes
- 3Center for Bioinformatics and Genome Biology, Fundacion Ciencia y Vida and Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago, Chile
| | - Elizabeth L. J. Watkin
- 1School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, Perth, Australia
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10
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Castro C, Urbieta MS, Plaza Cazón J, Donati ER. Metal biorecovery and bioremediation: Whether or not thermophilic are better than mesophilic microorganisms. BIORESOURCE TECHNOLOGY 2019; 279:317-326. [PMID: 30755320 DOI: 10.1016/j.biortech.2019.02.028] [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: 11/22/2018] [Revised: 02/03/2019] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
Metal mobilization and immobilization catalyzed by microbial action are key processes in environmental biotechnology. Metal mobilization from ores, mining wastes, or solid residues can be used for recovering metals and/or remediating polluted environments; furthermore, immobilization reduces the migration of metals; cleans up effluents plus ground- and surface water; and, moreover, can help to concentrate and recover metals. Usually these processes provide certain advantages over traditional technologies such as more efficient economical and environmentally sustainable results. Since elevated temperatures typically increase chemical kinetics, it could be expected that bioprocesses should also be enhanced by replacing mesophiles with thermophiles or hyperthermophiles. Nevertheless, other issues like process stability, flexibility, and thermophile-versus-mesophile resistance to acidity and/or metal toxicity should be carefully considered. This review critically analyzes and compares thermophilic and mesophilic microbial performances in recent and selected representative examples of metal bioremediation and biorecovery.
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Affiliation(s)
- C Castro
- CINDEFI (CONICET-CCT LA PLATA UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 47 y 115, (1900), La Plata, Argentina
| | - M S Urbieta
- CINDEFI (CONICET-CCT LA PLATA UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 47 y 115, (1900), La Plata, Argentina.
| | - J Plaza Cazón
- CINDEFI (CONICET-CCT LA PLATA UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 47 y 115, (1900), La Plata, Argentina
| | - E R Donati
- CINDEFI (CONICET-CCT LA PLATA UNLP), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 47 y 115, (1900), La Plata, Argentina
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11
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Low-level thiocyanate concentrations impact on iron oxidation activity and growth of Leptospirillum ferriphilum through inhibition and adaptation. Res Microbiol 2018; 169:576-581. [DOI: 10.1016/j.resmic.2018.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Revised: 10/16/2018] [Accepted: 10/26/2018] [Indexed: 11/30/2022]
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12
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Khaleque HN, Shafique R, Kaksonen AH, Boxall NJ, Watkin EL. Quantitative proteomics using SWATH-MS identifies mechanisms of chloride tolerance in the halophilic acidophile Acidihalobacter prosperus DSM 14174. Res Microbiol 2018; 169:638-648. [DOI: 10.1016/j.resmic.2018.07.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 07/10/2018] [Accepted: 07/11/2018] [Indexed: 02/08/2023]
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13
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Selective copper extraction from sulfate media with N,N-dihexyl-N′-hydroxypyridine-carboximidamides as extractants. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.02.051] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Tufo AE, Porzionato NF, Curutchet G. Effects of pollution and bioleaching process on the mineral composition and texture of contaminated sediments of the Reconquista River, Argentina. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:21368-21384. [PMID: 29090439 DOI: 10.1007/s11356-017-0484-2] [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: 03/23/2017] [Accepted: 10/16/2017] [Indexed: 06/07/2023]
Abstract
In this work, we report on the structural and textural changes in fluvial sediments from Reconquista River´s basin, Argentina, due to processes of contamination with organic matter and remediation by bioleaching. The original uncontaminated matrix showed quartz and phyllosilicates as the main primary mineral constituents and phases of interstratified illite-montmorillonite as secondary minerals. It was found that in contaminated sediments, the presence of organic matter in high concentration causes changes in the specific surface area, particle size distribution, size and distribution of micro and meso, and the morphology of the particles with respect to the uncontaminated sediment. After the bioleaching process, there were even greater changes in these parameters at the level of secondary mineral formation and the appearance of nanoparticles, which were confirmed by SEM. Especially, we found the formation of cementing substances such as gypsum, promoting the formation of macroporous aggregates and the weathering of clay components. Our results indicate that the bioleaching not only decreases the content of metals but also favors the formation of a material with improved characteristics for potential future applications.
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Affiliation(s)
- Ana E Tufo
- Instituto de Investigación e Ingeniería Ambiental, and Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Campus Miguelete 25 de Mayo y Francia, San Martín, Provincia de Buenos Aires, Argentina
| | - Natalia F Porzionato
- Instituto de Investigación e Ingeniería Ambiental, and Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Campus Miguelete 25 de Mayo y Francia, San Martín, Provincia de Buenos Aires, Argentina
| | - Gustavo Curutchet
- Instituto de Investigación e Ingeniería Ambiental, and Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Campus Miguelete 25 de Mayo y Francia, San Martín, Provincia de Buenos Aires, Argentina.
- Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia, 1917, Buenos Aires, Argentina.
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Tang D, Duan J, Gao Q, Zhao Y, Li Y, Chen P, Zhou J, Wu Z, Xu R, Li H. Strand-specific RNA-seq analysis of the Acidithiobacillus ferrooxidans transcriptome in response to magnesium stress. Arch Microbiol 2018; 200:1025-1035. [PMID: 29637290 DOI: 10.1007/s00203-018-1503-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/06/2018] [Accepted: 03/10/2018] [Indexed: 12/24/2022]
Abstract
Bioleaching is a promising process for 350 million tons Jinchuan low-grade pentlandite. But, Jinchuan pentlandite has lots of magnesium and high concentration of Mg2+ is harmful to bioleaching microorganisms. Thus, finding a way to improve the adaption of microorganisms to Mg2+ is a key for bioleaching. In the study, we found that oxidizing activity, bioleaching ability and biofilm formation of A.f were inhibited by Mg2+ stress. In addition, we analyzed mRNA and small RNA (sRNA) of Acidithiobacillus ferrooxidans (A.f) under Mg2+ stress by strand-specific RNA-sequencing (ssRNA-seq). After the bioinformatics process, 2475 coding genes were obtained, and there were 33 differential expression genes (DEGs) in 0.1 M-VS-Con, including 28 down-regulated and 5 up-regulated, whereas 52 DEGs were obtained in 0.5 M-VS-Con, including 28 down-regulated and 24 up-regulated. Gene ontology analysis showed most of DEGs were involved in catalytic activity, metabolic process and single-organism process. Furthermore, we identified 636 sRNA and some differential expression sRNA that may respond to Mg2+ stress. Further analysis of DEGs suggested that Mg2+ stress reduced biofilm formation perhaps through inhibiting Type IV Pili-related gene expression and inhibited bacterial activity perhaps through affecting carbon fixation. The study provided the foundation to understand the mechanisms of Mg2+ resistance in A.f and may be helpful to improve bioleaching ability for pentlandit.
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Affiliation(s)
- Deping Tang
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou, 730000, People's Republic of China.,The School of Chemical and Biological Engineering, Lanzhou Jiaotong University, West Anning Road No. 88, Lanzhou, 730070, People's Republic of China
| | - Jiangong Duan
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou, 730000, People's Republic of China
| | - Qiyu Gao
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou, 730000, People's Republic of China
| | - Yang Zhao
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou, 730000, People's Republic of China
| | - Yang Li
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou, 730020, People's Republic of China
| | - Peng Chen
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou, 730020, People's Republic of China
| | - Jianping Zhou
- Institute of Biology, Gansu Academy of Sciences, South Dingxi Road No. 229, Lanzhou, 730000, People's Republic of China
| | - Zhengrong Wu
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou, 730020, People's Republic of China
| | - Ruixiang Xu
- Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou, 730020, People's Republic of China
| | - Hongyu Li
- Institute of Microbiology, School of Life Sciences, Lanzhou University, Tianshui Road No. 222, Lanzhou, 730000, People's Republic of China. .,Institute for Microbial and Biochemical Pharmacy, School of Pharmacy, Lanzhou University, Donggang Road No. 199, Lanzhou, 730020, People's Republic of China.
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Khaleque HN, Corbett MK, Ramsay JP, Kaksonen AH, Boxall NJ, Watkin ELJ. Complete genome sequence of Acidihalobacter prosperus strain F5, an extremely acidophilic, iron- and sulfur-oxidizing halophile with potential industrial applicability in saline water bioleaching of chalcopyrite. J Biotechnol 2017; 262:56-59. [PMID: 28986293 DOI: 10.1016/j.jbiotec.2017.10.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 10/01/2017] [Indexed: 11/17/2022]
Affiliation(s)
- Himel N Khaleque
- School of Biomedical Sciences and Curtin Health Innovation Research Institute, Curtin University, Perth, Australia; CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Melissa K Corbett
- School of Biomedical Sciences and Curtin Health Innovation Research Institute, Curtin University, Perth, Australia
| | - Joshua P Ramsay
- School of Biomedical Sciences and Curtin Health Innovation Research Institute, Curtin University, Perth, Australia
| | - Anna H Kaksonen
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Naomi J Boxall
- CSIRO Land and Water, 147 Underwood Avenue, Floreat, WA 6014, Australia
| | - Elizabeth L J Watkin
- School of Biomedical Sciences and Curtin Health Innovation Research Institute, Curtin University, Perth, Australia.
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Donati ER, Castro C, Urbieta MS. Thermophilic microorganisms in biomining. World J Microbiol Biotechnol 2016; 32:179. [PMID: 27628339 DOI: 10.1007/s11274-016-2140-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/12/2016] [Indexed: 10/21/2022]
Abstract
Biomining is an applied biotechnology for mineral processing and metal extraction from ores and concentrates. This alternative technology for recovering metals involves the hydrometallurgical processes known as bioleaching and biooxidation where the metal is directly solubilized or released from the matrix for further solubilization, respectively. Several commercial applications of biomining can be found around the world to recover mainly copper and gold but also other metals; most of them are operating at temperatures below 40-50 °C using mesophilic and moderate thermophilic microorganisms. Although biomining offers an economically viable and cleaner option, its share of the world´s production of metals has not grown as much as it was expected, mainly considering that due to environmental restrictions in many countries smelting and roasting technologies are being eliminated. The slow rate of biomining processes is for sure the main reason of their poor implementation. In this scenario the use of thermophiles could be advantageous because higher operational temperature would increase the rate of the process and in addition it would eliminate the energy input for cooling the system (bioleaching reactions are exothermic causing a serious temperature increase in bioreactors and inside heaps that adversely affects most of the mesophilic microorganisms) and it would decrease the passivation of mineral surfaces. In the last few years many thermophilic bacteria and archaea have been isolated, characterized, and even used for extracting metals. This paper reviews the current status of biomining using thermophiles, describes the main characteristics of thermophilic biominers and discusses the future for this biotechnology.
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Affiliation(s)
- Edgardo Rubén Donati
- CINDEFI (CCT LA PLATA-CONICET, UNLP), Facultad de Ciencias Exactas (UNLP), 47 y 115, (1900) La Plata, Buenos Aires, Argentina.
| | - Camila Castro
- CINDEFI (CCT LA PLATA-CONICET, UNLP), Facultad de Ciencias Exactas (UNLP), 47 y 115, (1900) La Plata, Buenos Aires, Argentina
| | - María Sofía Urbieta
- CINDEFI (CCT LA PLATA-CONICET, UNLP), Facultad de Ciencias Exactas (UNLP), 47 y 115, (1900) La Plata, Buenos Aires, Argentina
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