201
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Outer membrane cytochromes/flavin interactions in Shewanella spp.-A molecular perspective. Biointerphases 2017; 12:021004. [PMID: 28565913 DOI: 10.1116/1.4984007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Extracellular electron transfer (EET) is intrinsically associated with the core phenomena of energy harvesting/energy conversion in natural ecosystems and biotechnology applications. However, the mechanisms associated with EET are complex and involve molecular interactions that take place at the "bionano interface" where biotic/abiotic interactions are usually explored. This work provides molecular perspective on the electron transfer mechanism(s) employed by Shewanella oneidensis MR-1. Molecular docking simulations were used to explain the interfacial relationships between two outer-membrane cytochromes (OMC) OmcA and MtrC and riboflavin (RF) and flavin mononucleotide (FMN), respectively. OMC-flavin interactions were analyzed by studying the electrostatic potential, the hydrophilic/hydrophobic surface properties, and the van der Waals surface of the OMC proteins. As a result, it was proposed that the interactions between flavins and OMCs are based on geometrical recognition event. The possible docking positions of RF and FMN to OmcA and MtrC were also shown.
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202
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Rowe AR, Yoshimura M, LaRowe DE, Bird LJ, Amend JP, Hashimoto K, Nealson KH, Okamoto A. In situ
electrochemical enrichment and isolation of a magnetite-reducing bacterium from a high pH serpentinizing spring. Environ Microbiol 2017; 19:2272-2285. [DOI: 10.1111/1462-2920.13723] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 03/05/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Annette R. Rowe
- Department of Earth Sciences; University of Southern California; Los Angeles CA 90089 USA
| | - Miho Yoshimura
- Department of Applied and Chemical Engineering; University of Tokyo; Tokyo Japan
| | - Doug E. LaRowe
- Department of Earth Sciences; University of Southern California; Los Angeles CA 90089 USA
| | - Lina J. Bird
- Department of Earth Sciences; University of Southern California; Los Angeles CA 90089 USA
| | - Jan P. Amend
- Department of Earth Sciences; University of Southern California; Los Angeles CA 90089 USA
- Department of Biological Sciences; University of Southern California; Los Angeles CA 90089 USA
| | - Kazuhito Hashimoto
- Center for Green Research on Energy and Environmental Materials; National Institute for Material Sciences; Tsukuba Ibaraki 305-0047 Japan
| | - Kenneth H. Nealson
- Department of Earth Sciences; University of Southern California; Los Angeles CA 90089 USA
| | - Akihiro Okamoto
- Center for Green Research on Energy and Environmental Materials; National Institute for Material Sciences; Tsukuba Ibaraki 305-0047 Japan
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203
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Boosting current generation in microbial fuel cells by an order of magnitude by coating an ionic liquid polymer on carbon anodes. Biosens Bioelectron 2017; 91:644-649. [DOI: 10.1016/j.bios.2017.01.028] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/09/2017] [Accepted: 01/13/2017] [Indexed: 12/20/2022]
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204
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Kirchhofer ND, McCuskey SR, Mai C, Bazan GC. Anaerobic Respiration on Self‐Doped Conjugated Polyelectrolytes: Impact of Chemical Structure. Angew Chem Int Ed Engl 2017; 56:6519-6522. [DOI: 10.1002/anie.201701964] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 03/31/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Nathan D. Kirchhofer
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Samantha R. McCuskey
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Cheng‐Kang Mai
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Guillermo C. Bazan
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
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205
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Kirchhofer ND, McCuskey SR, Mai C, Bazan GC. Anaerobic Respiration on Self‐Doped Conjugated Polyelectrolytes: Impact of Chemical Structure. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701964] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nathan D. Kirchhofer
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Samantha R. McCuskey
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Cheng‐Kang Mai
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
| | - Guillermo C. Bazan
- Center for Polymers and Organic Solids, Department of Materials, Chemical Engineering, and Chemistry and Biochemistry University of California, Santa Barbara Santa Barbara CA 93106 USA
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206
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Tan W, Xi B, Wang G, Jiang J, He X, Mao X, Gao R, Huang C, Zhang H, Li D, Jia Y, Yuan Y, Zhao X. Increased Electron-Accepting and Decreased Electron-Donating Capacities of Soil Humic Substances in Response to Increasing Temperature. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:3176-3186. [PMID: 28212017 DOI: 10.1021/acs.est.6b04131] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The electron transfer capacities (ETCs) of soil humic substances (HSs) are linked to the type and abundance of redox-active functional moieties in their structure. Natural temperature can affect the chemical structure of natural organic matter by regulating their oxidative transformation and degradation in soil. However, it is unclear if there is a direct correlation between ETC of soil HS and mean annual temperature. In this study, we assess the response of the electron-accepting and -donating capacities (EAC and EDC) of soil HSs to temperature by analyzing HSs extracted from soil set along glacial-interglacial cycles through loess-palaeosol sequences and along natural temperature gradients through latitude and altitude transects. We show that the EAC and EDC of soil HSs increase and decrease, respectively, with increasing temperature. Increased temperature facilitates the prevalence of oxidative degradation and transformation of HS in soils, thus potentially promoting the preferentially oxidative degradation of phenol moieties of HS or the oxidative transformation of electron-donating phenol moieties to electron-accepting quinone moieties in the HS structure. Consequently, the EAC and EDC of HSs in soil increase and decrease, respectively. The results of this study could help to understand biogeochemical processes, wherein the redox functionality of soil organic matter is involved in the context of increasing temperature.
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Affiliation(s)
| | - Beidou Xi
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University , Lanzhou 730070, China
| | - Guoan Wang
- College of Resources and Environmental Sciences, China Agricultural University , Beijing 100193, China
| | - Jie Jiang
- College of Environmental Science and Engineering, Beijing Forestry University , Beijing 100083, China
| | | | - Xuhui Mao
- School of Resource and Environmental Science, Wuhan University , Wuhan 430079, China
| | | | | | | | | | - Yufu Jia
- College of Resources and Environmental Sciences, China Agricultural University , Beijing 100193, China
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207
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Abstract
In MtrF, an outer-membrane multiheme cytochrome, the 10 heme groups are arranged in heme binding domains II and IV along the pseudo-C2 axis, forming the electron transfer (ET) pathways. Previous reports based on molecular dynamics simulations showed that the redox potential (Em) values for the heme pairs located in symmetrical positions in domains II and IV were similar, forming bidirectional ET pathways [Breuer M, Zarzycki P, Blumberger J, Rosso KM (2012) J Am Chem Soc 134(24):9868-9871]. Here, we present the Em values of the 10 hemes in MtrF, solving the linear Poisson-Boltzmann equation and considering the protonation states of all titratable residues and heme propionic groups. In contrast to previous studies, the Em values indicated that the ET is more likely to be downhill from domain IV to II because of localization of acidic residues in domain IV. Reduction of hemes in MtrF lowered the Em values, resulting in switching to alternative downhill ET pathways that extended to the flavin binding sites. These findings present an explanation of how MtrF serves as an electron donor to extracellular substrates.
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208
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Kirchhofer ND, Rengert ZD, Dahlquist FW, Nguyen TQ, Bazan GC. A Ferrocene-Based Conjugated Oligoelectrolyte Catalyzes Bacterial Electrode Respiration. Chem 2017. [DOI: 10.1016/j.chempr.2017.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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209
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Li SW, He H, Zeng RJ, Sheng GP. Chitin degradation and electricity generation by Aeromonas hydrophila in microbial fuel cells. CHEMOSPHERE 2017; 168:293-299. [PMID: 27810527 DOI: 10.1016/j.chemosphere.2016.10.080] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 10/14/2016] [Accepted: 10/21/2016] [Indexed: 06/06/2023]
Abstract
Chitin is one of the most abundant biopolymers in nature and the main composition of shrimp and crab shells (usually as food wastes). Thus it is essential to investigate the potential of degrading chitin for energy recovery. This study investigated the anaerobic degradation of chitin by Aeromonas hydrophila, a chitinolytic and popular electroactive bacterium, in both fermentation and microbial fuel cell (MFC) systems. The primary chitin metabolites produced in MFC were succinate, lactate, acetate, formate, and ethanol. The total metabolite concentration from chitin degradation increased seven-fold in MFC compared to the fermentation system, as well as additional electricity generation. Moreover, A. hydrophila degraded GlcNAc (the intermediate of chitin hydrolysis) significantly faster (0.97 and 0.94 mM C/d/mM-GlcNAc) than chitin (0.13 and 0.03 mM C/d/mM-GlcNAc) in MFC and fermentation systems, indicating that extracellular hydrolysis of chitin was the rate-limiting step and this step could be accelerated in MFC. Furthermore, more chemicals produced by the addition of exogenous mediators in MFC. This study proves that the chitin could be degraded effectively by an electroactive bacterium in MFC, and our results suggest that this bioelectrochemical system might be useful for the degradation of recalcitrant biomass to recover energy.
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Affiliation(s)
- Shan-Wei Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Hui He
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Raymond J Zeng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Guo-Ping Sheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
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210
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Liu T, Wu Y, Li F, Li X, Luo X. Rapid Redox Processes ofc-Type Cytochromes in A Living Cell Suspension ofShewanella oneidensisMR-1. ChemistrySelect 2017. [DOI: 10.1002/slct.201602021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Tongxu Liu
- Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control; Guangdong Institute of Eco-Environmental and Soil Sciences; Guangzhou 510650 PR China
| | - Yundang Wu
- Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control; Guangdong Institute of Eco-Environmental and Soil Sciences; Guangzhou 510650 PR China
| | - Fangbai Li
- Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control; Guangdong Institute of Eco-Environmental and Soil Sciences; Guangzhou 510650 PR China
| | - Xiaomin Li
- Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control; Guangdong Institute of Eco-Environmental and Soil Sciences; Guangzhou 510650 PR China
| | - Xiaobo Luo
- Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control; Guangdong Institute of Eco-Environmental and Soil Sciences; Guangzhou 510650 PR China
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211
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Sun DZ, Yu YY, Xie RR, Zhang CL, Yang Y, Zhai DD, Yang G, Liu L, Yong YC. In-situ growth of graphene/polyaniline for synergistic improvement of extracellular electron transfer in bioelectrochemical systems. Biosens Bioelectron 2017; 87:195-202. [DOI: 10.1016/j.bios.2016.08.037] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 08/10/2016] [Accepted: 08/13/2016] [Indexed: 01/20/2023]
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212
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SAITO J, HASHIMOTO K, OKAMOTO A. Nanoscale Secondary Ion Mass Spectrometry Analysis of Individual Bacterial Cells Reveals Feedback from Extracellular Electron Transport to Upstream Reactions. ELECTROCHEMISTRY 2017. [DOI: 10.5796/electrochemistry.85.444] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Junki SAITO
- Department of Applied Chemistry, School of Engineering, The University of Tokyo
| | - Kazuhito HASHIMOTO
- Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science
| | - Akihiro OKAMOTO
- Global Research Center for Environment and Energy based on Nanomaterials Science, National Institute for Materials Science
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213
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Extracellular Electron Transfer and Biosensors. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2017; 167:15-38. [PMID: 29071406 DOI: 10.1007/10_2017_34] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This chapter summarizes in the beginning our current understanding of extracellular electron transport processes in organisms belonging to the genera Shewanella and Geobacter. Organisms belonging to these genera developed strategies to transport respiratory electrons to the cell surface that are defined by modules of which some seem to be rather unique for one or the other genus while others are similar. We use this overview regarding our current knowledge of extracellular electron transfer to explain the physiological interaction of microorganisms in direct interspecies electron transfer, a process in which one organism basically comprises the electron acceptor for another microbe and that depends also on extended electron transport chains. This analysis of mechanisms for the transport of respiratory electrons to insoluble electron acceptors ends with an overview of questions that remain so far unanswered. Moreover, we use the description of the biochemistry of extracellular electron transport to explain the fundamentals of biosensors based on this process and give an overview regarding their status of development and applicability. Graphical Abstract.
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214
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Li F, Li Y, Sun L, Li X, Yin C, An X, Chen X, Tian Y, Song H. Engineering Shewanella oneidensis enables xylose-fed microbial fuel cell. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:196. [PMID: 28804512 PMCID: PMC5549365 DOI: 10.1186/s13068-017-0881-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 08/01/2017] [Indexed: 05/22/2023]
Abstract
BACKGROUND The microbial fuel cell (MFC) is a green and sustainable technology for electricity energy harvest from biomass, in which exoelectrogens use metabolism and extracellular electron transfer pathways for the conversion of chemical energy into electricity. However, Shewanella oneidensis MR-1, one of the most well-known exoelectrogens, could not use xylose (a key pentose derived from hydrolysis of lignocellulosic biomass) for cell growth and power generation, which limited greatly its practical applications. RESULTS Herein, to enable S. oneidensis to directly utilize xylose as the sole carbon source for bioelectricity production in MFCs, we used synthetic biology strategies to successfully construct four genetically engineered S. oneidensis (namely XE, GE, XS, and GS) by assembling one of the xylose transporters (from Candida intermedia and Clostridium acetobutylicum) with one of intracellular xylose metabolic pathways (the isomerase pathway from Escherichia coli and the oxidoreductase pathway from Scheffersomyces stipites), respectively. We found that among these engineered S. oneidensis strains, the strain GS (i.e. harbouring Gxf1 gene encoding the xylose facilitator from C. intermedi, and XYL1, XYL2, and XKS1 genes encoding the xylose oxidoreductase pathway from S. stipites) was able to generate the highest power density, enabling a maximum electricity power density of 2.1 ± 0.1 mW/m2. CONCLUSION To the best of our knowledge, this was the first report on the rationally designed Shewanella that could use xylose as the sole carbon source and electron donor to produce electricity. The synthetic biology strategies developed in this study could be further extended to rationally engineer other exoelectrogens for lignocellulosic biomass utilization to generate electricity power.
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Affiliation(s)
- Feng Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Yuanxiu Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Liming Sun
- Petrochemical Research Institute, PetroChina Company Limited, Beijing, 102206 People’s Republic of China
| | - Xiaofei Li
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Changji Yin
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Xingjuan An
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Xiaoli Chen
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Yao Tian
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
| | - Hao Song
- Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072 China
- SynBio Research Platform, Collaborative Innovation Centre of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 China
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215
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Cherkouk A, Law GTW, Rizoulis A, Law K, Renshaw JC, Morris K, Livens FR, Lloyd JR. Influence of riboflavin on the reduction of radionuclides by Shewanella oneidenis MR-1. Dalton Trans 2016; 45:5030-7. [PMID: 26632613 DOI: 10.1039/c4dt02929a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Uranium (as UO2(2+)), technetium (as TcO4(-)) and neptunium (as NpO2(+)) are highly mobile radionuclides that can be reduced enzymatically by a range of anaerobic and facultatively anaerobic microorganisms, including Shewanella oneidensis MR-1, to poorly soluble species. The redox chemistry of Pu is more complicated, but the dominant oxidation state in most environments is highly insoluble Pu(IV), which can be reduced to Pu(III) which has a potentially increased solubility which could enhance migration of Pu in the environment. Recently it was shown that flavins (riboflavin and flavin mononucleotide (FMN)) secreted by Shewanella oneidensis MR-1 can act as electron shuttles, promoting anoxic growth coupled to the accelerated reduction of poorly-crystalline Fe(III) oxides. Here, we studied the role of riboflavin in mediating the reduction of radionuclides in cultures of Shewanella oneidensis MR-1. Our results demonstrate that the addition of 10 μM riboflavin enhances the reduction rate of Tc(VII) to Tc(IV), Pu(IV) to Pu(III) and to a lesser extent, Np(V) to Np(IV), but has no significant influence on the reduction rate of U(VI) by Shewanella oneidensis MR-1. Thus riboflavin can act as an extracellular electron shuttle to enhance rates of Tc(VII), Np(V) and Pu(IV) reduction, and may therefore play a role in controlling the oxidation state of key redox active actinides and fission products in natural and engineered environments. These results also suggest that the addition of riboflavin could be used to accelerate the bioremediation of radionuclide-contaminated environments.
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Affiliation(s)
- Andrea Cherkouk
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
| | - Gareth T W Law
- Centre for Radiochemistry Research, School of Chemistry, Manchester, M13 9PL, UK
| | - Athanasios Rizoulis
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
| | - Katie Law
- Centre for Radiochemistry Research, School of Chemistry, Manchester, M13 9PL, UK
| | - Joanna C Renshaw
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
| | - Katherine Morris
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
| | - Francis R Livens
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK. and Centre for Radiochemistry Research, School of Chemistry, Manchester, M13 9PL, UK
| | - Jonathan R Lloyd
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
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216
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Vicari F, D'Angelo A, Galia A, Quatrini P, Scialdone O. A single-chamber membraneless microbial fuel cell exposed to air using Shewanella putrefaciens. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.11.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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217
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NapB in excess inhibits growth of Shewanella oneidensis by dissipating electrons of the quinol pool. Sci Rep 2016; 6:37456. [PMID: 27857202 PMCID: PMC5114592 DOI: 10.1038/srep37456] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 10/25/2016] [Indexed: 01/22/2023] Open
Abstract
Shewanella, a group of ubiquitous bacteria renowned for respiratory versatility, thrive in environments where various electron acceptors (EAs) of different chemical and physiological characteristics coexist. Despite being extensively studied, we still know surprisingly little about strategies by which multiple EAs and their interaction define ecophysiology of these bacteria. Previously, we showed that nitrite inhibits growth of the genus representative Shewanella oneidensis on fumarate and presumably some other CymA (quinol dehydrogenase)-dependent EAs by reducing cAMP production, which in turn leads to lowered expression of nitrite and fumarate reductases. In this study, we demonstrated that inhibition of fumarate growth by nitrite is also attributable to overproduction of NapB, the cytochrome c subunit of nitrate reductase. Further investigations revealed that excessive NapB per se inhibits growth on all EAs tested, including oxygen. When overproduced, NapB acts as an electron shuttle to dissipate electrons of the quinol pool, likely to extracellullar EAs, because the Mtr system, the major electron transport pathway for extracellular electron transport, is implicated. The study not only sheds light on mechanisms by which certain EAs, especially toxic ones, impact the bacterial ecophysiology, but also provides new insights into how electron shuttle c-type cytochromes regulate multi-branched respiratory networks.
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218
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Ainsworth EV, Lockwood CWJ, White GF, Hwang ET, Sakai T, Gross MA, Richardson DJ, Clarke TA, Jeuken LJC, Reisner E, Butt JN. Photoreduction of Shewanella oneidensis Extracellular Cytochromes by Organic Chromophores and Dye-Sensitized TiO 2. Chembiochem 2016; 17:2324-2333. [PMID: 27685371 PMCID: PMC5215560 DOI: 10.1002/cbic.201600339] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Indexed: 12/28/2022]
Abstract
The transfer of photoenergized electrons from extracellular photosensitizers across a bacterial cell envelope to drive intracellular chemical transformations represents an attractive way to harness nature's catalytic machinery for solar-assisted chemical synthesis. In Shewanella oneidensis MR-1 (MR-1), trans-outer-membrane electron transfer is performed by the extracellular cytochromes MtrC and OmcA acting together with the outer-membrane-spanning porin⋅cytochrome complex (MtrAB). Here we demonstrate photoreduction of solutions of MtrC, OmcA, and the MtrCAB complex by soluble photosensitizers: namely, eosin Y, fluorescein, proflavine, flavin, and adenine dinucleotide, as well as by riboflavin and flavin mononucleotide, two compounds secreted by MR-1. We show photoreduction of MtrC and OmcA adsorbed on RuII -dye-sensitized TiO2 nanoparticles and that these protein-coated particles perform photocatalytic reduction of solutions of MtrC, OmcA, and MtrCAB. These findings provide a framework for informed development of strategies for using the outer-membrane-associated cytochromes of MR-1 for solar-driven microbial synthesis in natural and engineered bacteria.
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Affiliation(s)
- Emma V. Ainsworth
- School of ChemistryUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
| | - Colin W. J. Lockwood
- School of ChemistryUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
| | - Gaye F. White
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
| | - Ee Taek Hwang
- School of Biomedical SciencesUniversity of LeedsLeedsLS2 9JTUK
| | - Tsubasa Sakai
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
- Present address: Suntory Foundation for Life SciencesKyoto619-0284Japan
| | - Manuela A. Gross
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - David J. Richardson
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
| | - Thomas A. Clarke
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
| | | | - Erwin Reisner
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Julea N. Butt
- School of ChemistryUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorfolkNR4 7TJUK
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219
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Kavanagh P, Botting CH, Jana PS, Leech D, Abram F. Comparative Proteomics Implicates a Role for Multiple Secretion Systems in Electrode-Respiring Geobacter sulfurreducens Biofilms. J Proteome Res 2016; 15:4135-4145. [DOI: 10.1021/acs.jproteome.5b01019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Paul Kavanagh
- School
of Chemistry, National University of Ireland Galway, University Road, Galway, Ireland
| | - Catherine H. Botting
- Biomedical
Sciences Research Complex, University of St. Andrews, North Haugh, Fife KY16 9ST, United Kingdom
| | - Partha S. Jana
- School
of Chemistry, National University of Ireland Galway, University Road, Galway, Ireland
| | - Dónal Leech
- School
of Chemistry, National University of Ireland Galway, University Road, Galway, Ireland
| | - Florence Abram
- Functional
Environmental Microbiology, School of Natural Sciences, National University of Ireland Galway, University Road, Galway, Ireland
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220
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Flavin as an Indicator of the Rate-Limiting Factor for Microbial Current Production in Shewanella oneidensis MR-1. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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221
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Liu T, Yu YY, Chen T, Chen WN. A synthetic microbial consortium of Shewanella
and Bacillus
for enhanced generation of bioelectricity. Biotechnol Bioeng 2016; 114:526-532. [DOI: 10.1002/bit.26094] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 08/23/2016] [Accepted: 08/29/2016] [Indexed: 01/26/2023]
Affiliation(s)
- Ting Liu
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive 637457 Singapore
- Residues and Resource Reclamation Centre; Nanyang Environment and Water Research Institute; Nanyang Technological University; Singapore
| | - Yang-Yang Yu
- School of the Environment; Biofuels Institute; Jiangsu University; Zhenjiang Jiangsu China
| | - Tao Chen
- Key Laboratory of Systems Bioengineering (Ministry of Education); School of Chemical Engineering & Technology; Tianjin University; Tianjin China
| | - Wei Ning Chen
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive 637457 Singapore
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222
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Breuer M, Rosso KM, Blumberger J. Flavin Binding to the Deca-heme Cytochrome MtrC: Insights from Computational Molecular Simulation. Biophys J 2016; 109:2614-2624. [PMID: 26682818 PMCID: PMC4699859 DOI: 10.1016/j.bpj.2015.10.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/20/2015] [Accepted: 10/29/2015] [Indexed: 11/29/2022] Open
Abstract
Certain dissimilatory bacteria have the remarkable ability to use extracellular metal oxide minerals instead of oxygen as terminal electron sinks, using a process known as “extracellular respiration”. Specialized multiheme cytochromes located on the outer membrane of the microbe were shown to be crucial for electron transfer from the cell surface to the mineral. This process is facilitated by soluble, biogenic flavins secreted by the organism for the purpose of acting as an electron shuttle. However, their interactions with the outer-membrane cytochromes are not established on a molecular scale. Here, we study the interaction between the outer-membrane deca-heme cytochrome MtrC from Shewanella oneidensis and flavin mononucleotide (FMN in fully oxidized quinone form) using computational docking. We find that interaction of FMN with MtrC is significantly weaker than with known FMN-binding proteins, but identify a mildly preferred interaction site close to heme 2 with a dissociation constant (Kd) = 490 μM, in good agreement with recent experimental estimates, Kd = 255 μM. The weak interaction with MtrC can be qualitatively explained by the smaller number of hydrogen bonds that the planar headgroup of FMN can form with this protein compared to FMN-binding proteins. Molecular dynamics simulation gives indications for a possible conformational switch upon cleavage of the disulphide bond of MtrC, but without concomitant increase in binding affinities according to this docking study. Overall, our results suggest that binding of FMN to MtrC is reversible and not highly specific, which may be consistent with a role as redox shuttle that facilitates extracellular respiration.
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Affiliation(s)
| | - Kevin M Rosso
- Pacific Northwest National Laboratory, Richland, Washington
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223
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Wu Y, Li F, Liu T, Han R, Luo X. pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.07.122] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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224
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Extracellular electron transfer mechanisms between microorganisms and minerals. Nat Rev Microbiol 2016; 14:651-62. [DOI: 10.1038/nrmicro.2016.93] [Citation(s) in RCA: 850] [Impact Index Per Article: 106.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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225
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Nealson KH, Rowe AR. Electromicrobiology: realities, grand challenges, goals and predictions. Microb Biotechnol 2016; 9:595-600. [PMID: 27506517 PMCID: PMC4993177 DOI: 10.1111/1751-7915.12400] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Electromicrobiology is a subdiscipline of microbiology that involves extracellular electron transfer (EET) to (or from) insoluble electron active redox compounds located outside the outer membrane of the cell. These interactions can often be studied using electrochemical techniques which have provided novel insights into microbial physiology in recent years. The mechanisms (and variations) of outward EET are well understood for two model systems, Shewanella and Geobacter, both of which employ multihaem cytochromes to provide an electron conduit to the cell exterior. In contrast, little is known of the intricacies of inward EET, even in these model systems. Given the number of labs now working on EET, it seems likely that most of the mechanistic details will be understood in a few years for the model systems, and the many applications of electromicrobiology will continue to move forward. But emerging work, using electrodes as electron acceptors and donors is providing an abundance of new types of microbes capable of EET inward and/or outward: microbes that are clearly different from our known systems. The extent of this very diverse, and perhaps widely distributed and biogeochemically important ability needs to be determined to understand the mechanisms, importance, and raison d'etre of EET for microbial biology.
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Affiliation(s)
- Kenneth H Nealson
- Department of Earth Sciences, University of Southern California, Los Angeles, CA, USA
| | - Annette R Rowe
- Department of Earth Sciences, University of Southern California, Los Angeles, CA, USA
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226
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Lu M, Chan S, Babanova S, Bretschger O. Effect of oxygen on the per-cell extracellular electron transfer rate of Shewanella oneidensis MR-1 explored in bioelectrochemical systems. Biotechnol Bioeng 2016; 114:96-105. [PMID: 27399911 PMCID: PMC5132103 DOI: 10.1002/bit.26046] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 07/06/2016] [Indexed: 02/03/2023]
Abstract
Extracellular electron transfer (EET) is a mechanism that enables microbes to respire solid‐phase electron acceptors. These EET reactions most often occur in the absence of oxygen, since oxygen can act as a competitive electron acceptor for many facultative microbes. However, for Shewanella oneidensis MR‐1, oxygen may increase biomass development, which could result in an overall increase in EET activity. Here, we studied the effect of oxygen on S. oneidensis MR‐1 EET rates using bioelectrochemical systems (BESs). We utilized optically accessible BESs to monitor real‐time biomass growth, and studied the per‐cell EET rate as a function of oxygen and riboflavin concentrations in BESs of different design and operational conditions. Our results show that oxygen exposure promotes biomass development on the electrode, but significantly impairs per‐cell EET rates even though current production does not always decrease with oxygen exposure. Additionally, our results indicated that oxygen can affect the role of riboflavin in EET. Under anaerobic conditions, both current density and per‐cell EET rate increase with the riboflavin concentration. However, as the dissolved oxygen (DO) value increased to 0.42 mg/L, riboflavin showed very limited enhancement on per‐cell EET rate and current generation. Since it is known that oxygen can promote flavins secretion in S. oneidensis, the role of riboflavin may change under anaerobic and aerobic conditions. Biotechnol. Bioeng. 2017;114: 96–105. © 2016 The Authors. Biotechnology and Bioengineering Published by Wiley Periodicals, Inc.
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Affiliation(s)
- Mengqian Lu
- Department of Microbial and Environmental Genomics, J. Craig Venter Institute, 4120 Capricorn Lane, La Jolla, California 92037
| | - Shirley Chan
- Department of Microbial and Environmental Genomics, J. Craig Venter Institute, 4120 Capricorn Lane, La Jolla, California 92037
| | - Sofia Babanova
- Department of Microbial and Environmental Genomics, J. Craig Venter Institute, 4120 Capricorn Lane, La Jolla, California 92037.,Chemical and Biological Engineering, University of New Mexico, Albuquerque, New Mexico
| | - Orianna Bretschger
- Department of Microbial and Environmental Genomics, J. Craig Venter Institute, 4120 Capricorn Lane, La Jolla, California 92037
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227
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Yuan Y, Guo T, Qiu X, Tang J, Huang Y, Zhuang L, Zhou S, Li Z, Guan BO, Zhang X, Albert J. Electrochemical Surface Plasmon Resonance Fiber-Optic Sensor: In Situ Detection of Electroactive Biofilms. Anal Chem 2016; 88:7609-16. [DOI: 10.1021/acs.analchem.6b01314] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yong Yuan
- Guangdong
Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China
| | - Tuan Guo
- Guangdong
Key Laboratory of Optical Fiber Sensing and Communications, Institute
of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Xuhui Qiu
- Guangdong
Key Laboratory of Optical Fiber Sensing and Communications, Institute
of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Jiahuan Tang
- Guangdong
Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China
| | - Yunyun Huang
- Guangdong
Key Laboratory of Optical Fiber Sensing and Communications, Institute
of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Li Zhuang
- Guangdong
Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China
| | - Shungui Zhou
- Guangdong
Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China
| | - Zhaohui Li
- Guangdong
Key Laboratory of Optical Fiber Sensing and Communications, Institute
of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Bai-Ou Guan
- Guangdong
Key Laboratory of Optical Fiber Sensing and Communications, Institute
of Photonics Technology, Jinan University, Guangzhou 510632, China
| | - Xuming Zhang
- Department
of Applied Physics, Hong Kong Polytechnic University, Hong Kong, People’s Republic of China
| | - Jacques Albert
- Department
of Electronics, Carleton University, Ottawa K1S5B6, Canada
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228
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229
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Wang Y, Lv M, Meng Q, Ding C, Jiang L, Liu H. Facile One-Step Strategy for Highly Boosted Microbial Extracellular Electron Transfer of the Genus Shewanella. ACS NANO 2016; 10:6331-6337. [PMID: 27196945 DOI: 10.1021/acsnano.6b02629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
High performance of bacterial extracellular electron transfer (EET) is essentially important for its practical applications in versatile bioelectric fields. We developed a facile one-step approach to dramatically boost the bacterial EET activity 75-fold by exogenous addition of ethylenediamine tetraacetic acid disodium salt (EDTA-2Na, 1 mM) into the electrochemical cells, where the anodic process of microbial EET was monitored. We propose that EDTA-2Na enables both the alternation of the local environment around the c-type cytochromes located on the outer membrane channels (OMCs), which therefore changes the redox behavior of OMCs in mediating the EET process, and the formation of densely packed biofilm that can further facilitate the EET process. As a synergistic effect, the highly boosted bacterial EET activity was achieved. The method shows good generality for versatile bioelectrical bacteria. We envision that the method is also applicable for constructing various bioelectric devices.
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Affiliation(s)
- Yuan Wang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
| | - Meiling Lv
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
| | - Qingan Meng
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
| | - Chunmei Ding
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
| | - Huan Liu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, and ‡International Research Institute for Multidisciplinary Science, Beihang University , Beijing 100191, People's Republic of China
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230
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Hong G, Pachter R. Bound Flavin-Cytochrome Model of Extracellular Electron Transfer in Shewanella oneidensis: Analysis by Free Energy Molecular Dynamics Simulations. J Phys Chem B 2016; 120:5617-24. [PMID: 27266856 DOI: 10.1021/acs.jpcb.6b03851] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Flavins are known to enhance extracellular electron transfer (EET) in Shewanella oneidensis MR-1 bacteria, which reduce electron acceptors through outer-membrane (OM) cytochromes c. Free-shuttle and bound-redox cofactor mechanisms were proposed to explain this enhancement, but recent electrochemical reports favor a flavin-bound model, proposing two one-electron reductions of flavin, namely, oxidized (Ox) to semiquinone (Sq) and semiquinone to hydroquinone (Hq), at anodic and cathodic conditions, respectively. In this work, to provide a mechanistic understanding of riboflavin (RF) binding at the multiheme OM cytochrome OmcA, we explored binding configurations at hemes 2, 5, 7, and 10. Subsequently, on the basis of molecular dynamics (MD) simulations, binding free energies and redox potential shifts upon RF binding for the Ox/Sq and Sq/Hq reductions were analyzed. Our results demonstrated an upshift in the Ox/Sq and a downshift in the Sq/Hq redox potentials, consistent with a bound RF-OmcA model. Furthermore, binding free energy MD simulations indicated an RF binding preference at heme 7. MD simulations of the OmcA-MtrC complex interfacing at hemes 5 revealed a small interprotein redox potential difference with an electron transfer rate of 10(7)-10(8)/s.
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Affiliation(s)
- Gongyi Hong
- Air Force Research Laboratory , Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, United States
| | - Ruth Pachter
- Air Force Research Laboratory , Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio 45433, United States
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231
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Okamoto A, Tokunou Y, Saito J. Cation-limited kinetic model for microbial extracellular electron transport via an outer membrane cytochrome C complex. Biophys Physicobiol 2016; 13:71-76. [PMID: 27924259 PMCID: PMC5042175 DOI: 10.2142/biophysico.13.0_71] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 04/23/2016] [Indexed: 12/01/2022] Open
Abstract
Outer-membrane c-type cytochrome (OM c-Cyt) complexes in several genera of iron-reducing bacteria, such as Shewanella and Geobacter, are capable of transporting electrons from the cell interior to extracellular solids as a terminal step of anaerobic respiration. The kinetics of this electron transport has implications for controlling the rate of microbial electron transport during bioenergy or biochemical production, iron corrosion, and natural mineral cycling. Herein, we review the findings from in-vivo and in-vitro studies examining electron transport kinetics through single OM c-Cyt complexes in Shewanella oneidensis MR-1. In-vitro electron flux via a purified OM c-Cyt complex, comprised of MtrA, B, and C proteins from S. oneidensis MR-1, embedded in a proteoliposome system is reported to be 10- to 100-fold faster compared with in-vivo estimates based on measurements of electron flux per cell and OM c-Cyts density. As the proteoliposome system is estimated to have 10-fold higher cation flux via potassium channels than electrons, we speculate that the slower rate of electron-coupled cation transport across the OM is responsible for the significantly lower electron transport rate that is observed in-vivo. As most studies to date have primarily focused on the energetics or kinetics of interheme electron hopping in OM c-Cyts in this microbial electron transport mechanism, the proposed model involving cation transport provides new insight into the rate detemining step of EET, as well as the role of self-secreted flavin molecules bound to OM c-Cyt and proton management for energy conservation and production in S. oneidensis MR-1.
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Affiliation(s)
- Akihiro Okamoto
- Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan; Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshihide Tokunou
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Junki Saito
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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232
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Jangir Y, French S, Momper LM, Moser DP, Amend JP, El-Naggar MY. Isolation and Characterization of Electrochemically Active Subsurface Delftia and Azonexus Species. Front Microbiol 2016; 7:756. [PMID: 27242768 PMCID: PMC4876122 DOI: 10.3389/fmicb.2016.00756] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 05/05/2016] [Indexed: 11/29/2022] Open
Abstract
Continental subsurface environments can present significant energetic challenges to the resident microorganisms. While these environments are geologically diverse, potentially allowing energy harvesting by microorganisms that catalyze redox reactions, many of the abundant electron donors and acceptors are insoluble and therefore not directly bioavailable. Extracellular electron transfer (EET) is a metabolic strategy that microorganisms can deploy to meet the challenges of interacting with redox-active surfaces. Though mechanistically characterized in a few metal-reducing bacteria, the role, extent, and diversity of EET in subsurface ecosystems remains unclear. Since this process can be mimicked on electrode surfaces, it opens the door to electrochemical techniques to enrich for and quantify the activities of environmental microorganisms in situ. Here, we report the electrochemical enrichment of microorganisms from a deep fractured-rock aquifer in Death Valley, CA, USA. In experiments performed in mesocosms containing a synthetic medium based on aquifer chemistry, four working electrodes (WEs) were poised at different redox potentials (272, 373, 472, 572 mV vs. SHE) to serve as electron acceptors, resulting in anodic currents coupled to the oxidation of acetate during enrichment. The anodes were dominated by Betaproteobacteria from the families Comamonadaceae and Rhodocyclaceae. A representative of each dominant family was subsequently isolated from electrode-associated biomass. The EET abilities of the isolated Delftia strain (designated WE1-13) and Azonexus strain (designated WE2-4) were confirmed in electrochemical reactors using WEs poised at 522 mV vs. SHE. The rise in anodic current upon inoculation was correlated with a modest increase in total protein content. Both genera have been previously observed in mixed communities of microbial fuel cell enrichments, but this is the first direct measurement of their electrochemical activity. While alternate metabolisms (e.g., nitrate reduction) by these organisms were previously known, our observations suggest that additional ‘hidden’ interactions with external electron acceptors are also possible. Electrochemical approaches are well positioned to dissect such extracellular interactions that may be prevalent in the subsurface.
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Affiliation(s)
- Yamini Jangir
- Department of Physics and Astronomy, University of Southern California, Los Angeles CA, USA
| | - Sarah French
- Department of Physics and Astronomy, University of Southern California, Los Angeles CA, USA
| | - Lily M Momper
- Department of Biological Sciences, University of Southern California, Los Angeles CA, USA
| | - Duane P Moser
- Division of Earth and Ecosystem Sciences, Desert Research Institute, Las Vegas NV, USA
| | - Jan P Amend
- Department of Biological Sciences, University of Southern California, Los AngelesCA, USA; Department of Earth Sciences, University of Southern California, Los AngelesCA, USA
| | - Mohamed Y El-Naggar
- Department of Physics and Astronomy, University of Southern California, Los AngelesCA, USA; Department of Biological Sciences, University of Southern California, Los AngelesCA, USA; Department of Chemistry, University of Southern California, Los AngelesCA, USA
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233
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Jorge AB, Hazael R. Use ofShewanella oneidensisfor Energy Conversion in Microbial Fuel Cells. MACROMOL CHEM PHYS 2016. [DOI: 10.1002/macp.201500477] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- A. Belen Jorge
- Materials Research Institute; School of Engineering and Materials Sciences; Queen Mary University of London; Mile End Rd E1 4NS United Kingdom
| | - Rachael Hazael
- Christopher Ingold Building; Department of Chemistry; University College London; 20 Gordon Street WC1H 0AJ United Kingdom
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234
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Johnson JE, Savalia P, Davis R, Kocar BD, Webb SM, Nealson KH, Fischer WW. Real-Time Manganese Phase Dynamics during Biological and Abiotic Manganese Oxide Reduction. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:4248-58. [PMID: 27018915 PMCID: PMC5502836 DOI: 10.1021/acs.est.5b04834] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Manganese oxides are often highly reactive and easily reduced, both abiotically, by a variety of inorganic chemical species, and biologically during anaerobic respiration by microbes. To evaluate the reaction mechanisms of these different reduction routes and their potential lasting products, we measured the sequence progression of microbial manganese(IV) oxide reduction mediated by chemical species (sulfide and ferrous iron) and the common metal-reducing microbe Shewanella oneidensis MR-1 under several endmember conditions, using synchrotron X-ray spectroscopic measurements complemented by X-ray diffraction and Raman spectroscopy on precipitates collected throughout the reaction. Crystalline or potentially long-lived phases produced in these experiments included manganese(II)-phosphate, manganese(II)-carbonate, and manganese(III)-oxyhydroxides. Major controls on the formation of these discrete phases were alkalinity production and solution conditions such as inorganic carbon and phosphate availability. The formation of a long-lived Mn(III) oxide appears to depend on aqueous Mn(2+) production and the relative proportion of electron donors and electron acceptors in the system. These real-time measurements identify mineralogical products during Mn(IV) oxide reduction, contribute to understanding the mechanism of various Mn(IV) oxide reduction pathways, and assist in interpreting the processes occurring actively in manganese-rich environments and recorded in the geologic record of manganese-rich strata.
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Affiliation(s)
- Jena E. Johnson
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, United States
- Corresponding Author:
| | - Pratixa Savalia
- University of Southern California, Los Angeles, California 90089, United States
| | - Ryan Davis
- Stanford Synchrotron Radiation Lightsource, Menlo Park, California 94025, United States
| | - Benjamin D. Kocar
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Samuel M. Webb
- Stanford Synchrotron Radiation Lightsource, Menlo Park, California 94025, United States
| | - Kenneth H. Nealson
- University of Southern California, Los Angeles, California 90089, United States
| | - Woodward W. Fischer
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, United States
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235
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Xu S, Jangir Y, El-Naggar MY. Disentangling the roles of free and cytochrome-bound flavins in extracellular electron transport from Shewanella oneidensis MR-1. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.03.074] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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236
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Peng L, Zhang XT, Yin J, Xu SY, Zhang Y, Xie DT, Li ZL. Geobacter sulfurreducens adapts to low electrode potential for extracellular electron transfer. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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237
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Zhao C, Ding C, Lv M, Wang Y, Jiang L, Liu H. Hydrophilicity boosted extracellular electron transfer in Shewanella loihica PV-4. RSC Adv 2016. [DOI: 10.1039/c5ra24369f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A superhydrophilic electrode enables the drastically boosted bacterial EET activity ofShewanella loihicaPV-4. It is proposed that a hydrophilic electrode favors the reduced state of OMCs, and consequently both the EET activity and cell proliferation are highly facilitated.
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Affiliation(s)
- Chen Zhao
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- P. R. China
| | - Chunmei Ding
- College of Polymer Science and Engineering
- Sichuan University
- Chengdu 610065
- P. R. China
| | - Meiling Lv
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- P. R. China
| | - Yuan Wang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- P. R. China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- P. R. China
| | - Huan Liu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education
- School of Chemistry and Environment
- Beihang University
- Beijing 100191
- P. R. China
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238
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Nakanihi S, Okamoto A, Hashimoto K. ELECTROCHEMISTRY 2016; 84:93-98. [DOI: 10.5796/electrochemistry.84.93] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] Open
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239
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Yao Y, Huang X. Ferrous ion regulated extracellular electron transfer: towards self-suppressed microbial iron(iii) oxide reduction. Chem Commun (Camb) 2016; 52:3324-7. [DOI: 10.1039/c5cc09887d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Here, by using an electrochemical strategy, we demonstrated that ferrous ions are capable of regulating the bacterial EET process in a certain potential range where the conduction-band edge of natural abundant iron(iii) oxides is located.
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Affiliation(s)
- Yonghua Yao
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- School of Environment
- Tsinghua University
- Beijing 100084
- China
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240
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YAMADA T, KAWAICHI S, MATSUYAMA A, YOSHIDA M, MATSUSHITA N, NAKAMURA R. Extracellular Electron Transfer of Pseudomonas stutzeri Driven by Lithotrophic and Mixotrophic Denitrification. ELECTROCHEMISTRY 2016. [DOI: 10.5796/electrochemistry.84.312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Tetsuya YAMADA
- Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Satoshi KAWAICHI
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science
| | - Akihisa MATSUYAMA
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science
| | - Minoru YOSHIDA
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science
| | - Nobuhiro MATSUSHITA
- Department of Chemistry and Materials Science, Graduate School of Science and Engineering, Tokyo Institute of Technology
| | - Ryuhei NAKAMURA
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science
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241
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Kalathil S, Pant D. Nanotechnology to rescue bacterial bidirectional extracellular electron transfer in bioelectrochemical systems. RSC Adv 2016. [DOI: 10.1039/c6ra04734c] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Advanced nanostructured electrode materials largely improve the bacterial bidirectional extracellular electron transfer in bioelectrochemical systems.
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Affiliation(s)
- Shafeer Kalathil
- Division of Biological and Environmental Science & Engineering
- King Abdullah University of Science and Technology
- Thuwal 23955-6900
- Saudi Arabia
| | - Deepak Pant
- Separation and Conversion Technology
- VITO – Flemish Institute for Technological Research
- 2400 Mol
- Belgium
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242
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Sun H, Xu S, Zhuang G, Zhuang X. Performance and recent improvement in microbial fuel cells for simultaneous carbon and nitrogen removal: A review. J Environ Sci (China) 2016; 39:242-248. [PMID: 26899662 DOI: 10.1016/j.jes.2015.12.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 12/03/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
Microbial fuel cells (MFCs) have become a promising technology for wastewater treatment accompanying electricity generation. Carbon and nitrogen removal can be achieved by utilizing the electron transfer between the anode and cathode in an MFC. However, large-scale power production and high removal efficiency must be achieved at a low cost to make MFCs practical and economically competitive in the future. This article reviews the principles, feasibility and bottlenecks of MFCs for simultaneous carbon and nitrogen removal, the recent advances and prospective strategies for performance improvement, as well as the involved microbes and electron transfer mechanisms.
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Affiliation(s)
- Haishu Sun
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Shengjun Xu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Guoqiang Zhuang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Xuliang Zhuang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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243
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White GF, Edwards MJ, Gomez-Perez L, Richardson DJ, Butt JN, Clarke TA. Mechanisms of Bacterial Extracellular Electron Exchange. Adv Microb Physiol 2016; 68:87-138. [PMID: 27134022 DOI: 10.1016/bs.ampbs.2016.02.002] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The biochemical mechanisms by which microbes interact with extracellular soluble metal ions and insoluble redox-active minerals have been the focus of intense research over the last three decades. The process presents two challenges to the microorganism. Firstly, electrons have to be transported at the cell surface, which in Gram-negative bacteria presents an additional problem of electron transfer across the ~6nm of the outer membrane. Secondly, the electrons must be transferred to or from the terminal electron acceptors or donors. This review covers the known mechanisms that bacteria use to transport electrons across the cell envelope to external electron donors/acceptors. In Gram-negative bacteria, electron transfer across the outer membrane involves the use of an outer membrane β-barrel and cytochrome. These can be in the form of a porin-cytochrome protein, such as Cyc2 of Acidithiobacillus ferrooxidans, or a multiprotein porin-cytochrome complex like MtrCAB of Shewanella oneidensis MR-1. For mineral-respiring organisms, there is the additional challenge of transferring the electrons from the cell to mineral surface. For the strict anaerobe Geobacter sulfurreducens this requires electron transfer through conductive pili to associated cytochrome OmcS that directly reduces Fe(III)oxides, while the facultative anaerobe S. oneidensis MR-1 accomplishes mineral reduction through direct membrane contact, contact through filamentous extensions and soluble flavin shuttles, all of which require the outer membrane cytochromes MtrC and OmcA in addition to secreted flavin.
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Affiliation(s)
- G F White
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - M J Edwards
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - L Gomez-Perez
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - D J Richardson
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - J N Butt
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom
| | - T A Clarke
- School of Biological Sciences and School of Chemistry, University of East Anglia, Norwich, United Kingdom.
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244
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In Situ Analysis of a Silver Nanoparticle-Precipitating Shewanella Biofilm by Surface Enhanced Confocal Raman Microscopy. PLoS One 2015; 10:e0145871. [PMID: 26709923 PMCID: PMC4692441 DOI: 10.1371/journal.pone.0145871] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 12/09/2015] [Indexed: 11/19/2022] Open
Abstract
Shewanella oneidensis MR-1 is an electroactive bacterium, capable of reducing extracellular insoluble electron acceptors, making it important for both nutrient cycling in nature and microbial electrochemical technologies, such as microbial fuel cells and microbial electrosynthesis. When allowed to anaerobically colonize an Ag/AgCl solid interface, S. oneidensis has precipitated silver nanoparticles (AgNp), thus providing the means for a surface enhanced confocal Raman microscopy (SECRaM) investigation of its biofilm. The result is the in-situ chemical mapping of the biofilm as it developed over time, where the distribution of cytochromes, reduced and oxidized flavins, polysaccharides and phosphate in the undisturbed biofilm is monitored. Utilizing AgNp bio-produced by the bacteria colonizing the Ag/AgCl interface, we could perform SECRaM while avoiding the use of a patterned or roughened support or the introduction of noble metal salts and reducing agents. This new method will allow a spatially and temporally resolved chemical investigation not only of Shewanella biofilms at an insoluble electron acceptor, but also of other noble metal nanoparticle-precipitating bacteria in laboratory cultures or in complex microbial communities in their natural habitats.
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245
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Zhang X, Liu H, Wang J, Ren G, Xie B, Liu H, Zhu Y, Jiang L. Facilitated extracellular electron transfer of Shewanella loihica PV-4 by antimony-doped tin oxide nanoparticles as active microelectrodes. NANOSCALE 2015; 7:18763-18769. [PMID: 26505239 DOI: 10.1039/c5nr04765j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dissimilatory metal reducing bacteria are capable of extracellular electron transfer (EET) to insoluble metal oxides as external electron acceptors for their anaerobic respiration, which is recognized as an important energy-conversion process in natural and engineered environments, such as in mineral cycling, bioremediation, and microbial fuel/electrolysis cells. However, the low EET efficiency remains one of the major bottlenecks for its practical application. We report firstly that the microbial current generated by Shewanella loihica PV-4 (S. loihica PV-4) could be greatly improved that is up to ca. 115 fold, by adding antimony-doped tin oxide (ATO) nanoparticles in the electrochemical reactor. The results demonstrate that the biocompatible, electrically conductive ATO nanoparticles acted as active microelectrodes could facilitate the formation of a cells/ATO composite biofilm and the reduction of the outer membrane c-type cytochromes (OM c-Cyts) that are beneficial for the electron transfer from cells to electrode. Meanwhile, a synergistic effect between the participation of OM c-Cyts and the accelerated EET mediated by cell-secreted flavins may play an important role for the enhanced current generation in the presence of ATO nanoparticles. Moreover, it is worth noting that the TCA cycle in S. loihica PV-4 cells is activated by adding ATO nanoparticles, even if the potential is poised at +0.2 V, thereby also improving the EET process. The results presented here may provide a simple and effective strategy to boost the EET of S. loihica PV-4 cells, which is conducive to providing potential applications in bioelectrochemical systems.
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Affiliation(s)
- Xiaojian Zhang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, PR China.
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246
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Yuan Y, Shin H, Kang C, Kim S. Wiring microbial biofilms to the electrode by osmium redox polymer for the performance enhancement of microbial fuel cells. Bioelectrochemistry 2015; 108:8-12. [PMID: 26599210 DOI: 10.1016/j.bioelechem.2015.11.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 11/11/2015] [Accepted: 11/11/2015] [Indexed: 12/29/2022]
Abstract
An osmium redox polymer, PAA-PVI-[Os(4,4'-dimethyl-2,2'-bipyridine)2Cl]+/2+ that has been used in enzymatic fuel cells and microbial sensors, was applied for the first time to the anode of single-chamber microbial fuel cells with the mixed culture inoculum aiming at enhancing performance. Functioning as a molecular wire connecting the biofilm to the anode, power density increased from 1479 mW m(-2) without modification to 2355 mW m(-2) after modification of the anode. Evidence from cyclic voltammetry showed that the catalytic activity of an anodic biofilm was greatly enhanced in the presence of an osmium redox polymer, indicating that electrons were more efficiently transferred to the anode via co-immobilized osmium complex tethered to wiring polymer chains at the potential range of -0.3 V-+0.1 V (vs. SCE). The optimum amount of the redox polymer was determined to be 0.163 mg cm(-2).
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Affiliation(s)
- Yong Yuan
- Guangdong Key laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China
| | - Hyosul Shin
- Department of Chemistry, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju 561-756, South Korea
| | - Chan Kang
- Department of Chemistry, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju 561-756, South Korea.
| | - Sunghyun Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, South Korea.
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247
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Yang Y, Wu Y, Hu Y, Cao Y, Poh CL, Cao B, Song H. Engineering Electrode-Attached Microbial Consortia for High-Performance Xylose-Fed Microbial Fuel Cell. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01733] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Yun Yang
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, 637457, Singapore
- Singapore
Centre on Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
| | - Yichao Wu
- Singapore
Centre on Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
- School
of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 637798, Singapore
| | - Yidan Hu
- Singapore
Centre on Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
| | - Yingxiu Cao
- Key
Laboratory of Systems Bioengineering (Ministry of Education), SynBio
Research Platform, Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China
| | - Chueh Loo Poh
- School
of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, 637457, Singapore
| | - Bin Cao
- Singapore
Centre on Environmental Life Sciences Engineering, Nanyang Technological University, 60 Nanyang Drive, 637551, Singapore
- School
of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 637798, Singapore
| | - Hao Song
- Key
Laboratory of Systems Bioengineering (Ministry of Education), SynBio
Research Platform, Collaborative Innovation Center of Chemical Science
and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P.R. China
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248
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Ishii T, Kawaichi S, Nakagawa H, Hashimoto K, Nakamura R. From chemolithoautotrophs to electrolithoautotrophs: CO2 fixation by Fe(II)-oxidizing bacteria coupled with direct uptake of electrons from solid electron sources. Front Microbiol 2015; 6:994. [PMID: 26500609 PMCID: PMC4593280 DOI: 10.3389/fmicb.2015.00994] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/07/2015] [Indexed: 11/22/2022] Open
Abstract
At deep-sea vent systems, hydrothermal emissions rich in reductive chemicals replace solar energy as fuels to support microbial carbon assimilation. Until recently, all the microbial components at vent systems have been assumed to be fostered by the primary production of chemolithoautotrophs; however, both the laboratory and on-site studies demonstrated electrical current generation at vent systems and have suggested that a portion of microbial carbon assimilation is stimulated by the direct uptake of electrons from electrically conductive minerals. Here we show that chemolithoautotrophic Fe(II)-oxidizing bacterium, Acidithiobacillus ferrooxidans, switches the electron source for carbon assimilation from diffusible Fe2+ ions to an electrode under the condition that electrical current is the only source of energy and electrons. Site-specific marking of a cytochrome aa3 complex (aa3 complex) and a cytochrome bc1 complex (bc1 complex) in viable cells demonstrated that the electrons taken directly from an electrode are used for O2 reduction via a down-hill pathway, which generates proton motive force that is used for pushing the electrons to NAD+ through a bc1 complex. Activation of carbon dioxide fixation by a direct electron uptake was also confirmed by the clear potential dependency of cell growth. These results reveal a previously unknown bioenergetic versatility of Fe(II)-oxidizing bacteria to use solid electron sources and will help with understanding carbon assimilation of microbial components living in electronically conductive chimney habitats.
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Affiliation(s)
- Takumi Ishii
- Department of Applied Chemistry, School of Engineering, The University of Tokyo Tokyo, Japan
| | - Satoshi Kawaichi
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science Saitama, Japan
| | - Hirotaka Nakagawa
- Department of Applied Chemistry, School of Engineering, The University of Tokyo Tokyo, Japan
| | - Kazuhito Hashimoto
- Department of Applied Chemistry, School of Engineering, The University of Tokyo Tokyo, Japan
| | - Ryuhei Nakamura
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science Saitama, Japan
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249
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TerAvest MA, Ajo‐Franklin CM. Transforming exoelectrogens for biotechnology using synthetic biology. Biotechnol Bioeng 2015; 113:687-97. [DOI: 10.1002/bit.25723] [Citation(s) in RCA: 112] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 08/09/2015] [Indexed: 12/13/2022]
Affiliation(s)
- Michaela A. TerAvest
- California Institute for Quantitative BiosciencesUniversity of CaliforniaBerkeleyCalifornia94720
| | - Caroline M. Ajo‐Franklin
- Physical Biosciences DivisionLawrence Berkeley National LaboratoryBerkeleyCalifornia94720
- Materials Science DivisionLawrence Berkeley National LaboratoryBerkeleyCalifornia94720
- Synthetic Biology InstituteLawrence Berkeley National LaboratoryBerkeleyCalifornia94720
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250
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Isobutanol production from an engineered Shewanella oneidensis MR-1. Bioprocess Biosyst Eng 2015; 38:2147-54. [DOI: 10.1007/s00449-015-1454-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 08/07/2015] [Indexed: 10/23/2022]
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