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Camacho D, Frazao R, Fouillen A, Nanci A, Lang BF, Apte SC, Baron C, Warren LA. New Insights Into Acidithiobacillus thiooxidans Sulfur Metabolism Through Coupled Gene Expression, Solution Chemistry, Microscopy, and Spectroscopy Analyses. Front Microbiol 2020; 11:411. [PMID: 32231653 PMCID: PMC7082400 DOI: 10.3389/fmicb.2020.00411] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 02/27/2020] [Indexed: 01/23/2023] Open
Abstract
Here, we experimentally expand understanding of the reactions and enzymes involved in Acidithiobacillus thiooxidans ATCC 19377 S0 andS 2 O 3 2 - metabolism by developing models that integrate gene expression analyzed by RNA-Seq, solution sulfur speciation, electron microscopy and spectroscopy. The A. thiooxidansS 2 O 3 2 - metabolism model involves the conversion ofS 2 O 3 2 - to SO 4 2 - , S0 andS 4 O 6 2 - , mediated by the sulfur oxidase complex (Sox), tetrathionate hydrolase (TetH), sulfide quinone reductase (Sqr), and heterodisulfate reductase (Hdr) proteins. These same proteins, with the addition of rhodanese (Rhd), were identified to convert S0 to SO 3 2 - ,S 2 O 3 2 - and polythionates in the A. thiooxidans S0 metabolism model. Our combined results shed light onto the important role specifically of TetH inS 2 O 3 2 - metabolism. Also, we show that activity of Hdr proteins rather than Sdo are likely associated with S0 oxidation. Finally, our data suggest that formation of intracellularS 2 O 3 2 - is a critical step in S0 metabolism, and that recycling of internally generated SO 3 2 - occurs, through comproportionating reactions that result inS 2 O 3 2 - . Electron microscopy and spectroscopy confirmed intracellular production and storage of S0 during growth on both S0 andS 2 O 3 2 - substrates.
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Affiliation(s)
- David Camacho
- School of Geography and Earth Science, Faculty of Science, McMaster University, Hamilton, ON, Canada
| | - Rodolfo Frazao
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Aurélien Fouillen
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
- Laboratory for the Study of Calcified Tissues and Biomaterials, Faculty of Dentistry, Université de Montréal, Montreal, QC, Canada
| | - Antonio Nanci
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
- Laboratory for the Study of Calcified Tissues and Biomaterials, Faculty of Dentistry, Université de Montréal, Montreal, QC, Canada
| | - B. Franz Lang
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Simon C. Apte
- CSIRO, Land and Water, Lucas Heights, NSW, Australia
| | - Christian Baron
- Department of Biochemistry and Molecular Medicine, Faculty of Medicine, Université de Montréal, Montreal, QC, Canada
| | - Lesley A. Warren
- School of Geography and Earth Science, Faculty of Science, McMaster University, Hamilton, ON, Canada
- Department of Civil and Mineral Engineering, Faculty of Applied Science and Engineering, University of Toronto, Toronto, ON, Canada
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Effects of pH value on the expression of key iron/sulfur oxidation genes during bioleaching of chalcopyrite on thermophilic condition. ANN MICROBIOL 2019. [DOI: 10.1007/s13213-019-01453-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Niu J, Deng J, Xiao Y, He Z, Zhang X, Van Nostrand JD, Liang Y, Deng Y, Liu X, Yin H. The shift of microbial communities and their roles in sulfur and iron cycling in a copper ore bioleaching system. Sci Rep 2016; 6:34744. [PMID: 27698381 PMCID: PMC5048113 DOI: 10.1038/srep34744] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 09/20/2016] [Indexed: 11/16/2022] Open
Abstract
Bioleaching has been employed commercially to recover metals from low grade ores, but the production efficiency remains to be improved due to limited understanding of the system. This study examined the shift of microbial communities and S&Fe cycling in three subsystems within a copper ore bioleaching system: leaching heap (LH), leaching solution (LS) and sediment under LS. Results showed that both LH and LS had higher relative abundance of S and Fe oxidizing bacteria, while S and Fe reducing bacteria were more abundant in the Sediment. GeoChip analysis showed a stronger functional potential for S0 oxidation in LH microbial communities. These findings were consistent with measured oxidation activities to S0 and Fe2+, which were highest by microbial communities from LH, lower by those from LS and lowest form Sediment. Moreover, phylogenetic molecular ecological network analysis indicated that these differences might be related to interactions among microbial taxa. Last but not the least, a conceptual model was proposed, linking the S&Fe cycling with responsible microbial populations in the bioleaching systems. Collectively, this study revealed the microbial community and functional structures in all three subsystems of the copper ore, and advanced a holistic understanding of the whole bioleaching system.
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Affiliation(s)
- Jiaojiao Niu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
| | - Jie Deng
- Institute for Environmental Genomics and Department of Botany and Microbiology, University of Oklahoma, Norman 73019, USA
| | - Yunhua Xiao
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
| | - Zhili He
- Institute for Environmental Genomics and Department of Botany and Microbiology, University of Oklahoma, Norman 73019, USA
| | - Xian Zhang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
| | - J. D. Van Nostrand
- Institute for Environmental Genomics and Department of Botany and Microbiology, University of Oklahoma, Norman 73019, USA
| | - Yili Liang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
| | - Ye Deng
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100081, China
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
| | - Huaqun Yin
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
- Key laboratory of Biometallurgy, Ministry of Education, Changsha 410083, China
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Expression of Critical Sulfur- and Iron-Oxidation Genes and the Community Dynamics During Bioleaching of Chalcopyrite Concentrate by Moderate Thermophiles. Curr Microbiol 2015; 71:62-9. [DOI: 10.1007/s00284-015-0817-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 03/05/2015] [Indexed: 10/23/2022]
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Zhou S, Gan M, Zhu J, Li Q, Jie S, Yang B, Liu X. Catalytic effect of light illumination on bioleaching of chalcopyrite. BIORESOURCE TECHNOLOGY 2015; 182:345-352. [PMID: 25722073 DOI: 10.1016/j.biortech.2015.02.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Revised: 02/04/2015] [Accepted: 02/05/2015] [Indexed: 06/04/2023]
Abstract
The influence of visible light exposure on chalcopyrite bioleaching was investigated using Acidithiobacillus ferrooxidans. The results indicated, in both shake-flasks and aerated reactors with 8500-lux light, the dissolved Cu was 91.80% and 23.71% higher, respectively, than that in the controls without light. The catalytic effect was found to increase bioleaching to a certain limit, then plateaued as the initial chalcopyrite concentration increased from 2% to 4.5%. Thus a balanced mineral concentration is highly amenable to bioleaching via offering increased available active sites for light adsorption while eschewing mineral aggregation and screening effects. Using semiconducting chalcopyrite, the light facilitated the reduction of Fe(3+) to Fe(2+) as metabolic substrates for A.ferrooxidans, leading to better biomass, lower pH and redox potential, which are conducive to chalcopyrite leaching. The light exposure on iron redox cycling was further confirmed by chemical leaching tests using Fe(3+), which exhibited higher Fe(2+) levels in the light-induced system.
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Affiliation(s)
- Shuang Zhou
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China
| | - Min Gan
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China
| | - Jianyu Zhu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China.
| | - Qian Li
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China; Universität Duisburg-Essen, Biofilm Centre, Aquatische Biotechnologie, Universitätsstraße 545141 Essen, Germany
| | - Shiqi Jie
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China
| | - Baojun Yang
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha, China; Key Laboratory of Biohydrometallurgy, Ministry of Education, Changsha, China
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Insights into the relation between adhesion force and chalcopyrite-bioleaching by Acidithiobacillus ferrooxidans. Colloids Surf B Biointerfaces 2015; 126:351-7. [DOI: 10.1016/j.colsurfb.2014.11.036] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 11/23/2014] [Accepted: 11/24/2014] [Indexed: 11/23/2022]
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