Electrons selective uptake of a metal-reducing bacterium Shewanella oneidensis MR-1 from ferrocyanide
Copyright © 2019 Elsevier B.V. All rights reserved..
The extracellular electron transfer of Shewanella oneidensis MR-1 (MR-1) has been extensively studied due to the importance of the biosensors and energy applications of bioelectrochemical systems. However, the oxidation of metal compounds by MR-1, which represents the inward extracellular electron transfer from extracellular electron donors into the microbe, is barely understood. In this study, MR-1 immobilized on an electrode electrocatalyzes the oxidation of [Fe(CN)6]4- to [Fe(CN)6]3- efficiently and selectively. The selectivity depends on midpoint potential and overall charge(s) of redox molecules. Among 12 investigated redox molecules, the negatively charged molecules with high midpoint potentials, i.e., [Ru(CN)6]4- and [Fe(CN)6]4-, show strong electrocatalysis. Neither reference bacteria (Escherichia coli K-12 nor Streptococcus mutans) electrocatalyze the oxidation of [Fe(CN)6]4-. The electrocatalysis decays when MR-1 is covered with palladium nanoparticles presumptively involved with cytochromes c. However, cytochromes c MtrC and OmcA on MR-1 do not play an essential role in this process. The results support a model that [Fe(CN)6]4- donor electrons to MR-1 by interacting with undiscovered active sites and the electrons are subsequently transferred to the electrode through the mediating effect of [Fe(CN)6]4-/3-. The selective electron uptake by MR-1 provides valuable and fundamental insights of the applications of bioelectrochemical systems and the detection of specific redox molecules.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:142 |
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| Enthalten in: |
Biosensors & bioelectronics - 142(2019) vom: 01. Okt., Seite 111571 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zheng, Zhiyong [VerfasserIn] |
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| Links: |
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| Themen: |
5TWQ1V240M |
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| Anmerkungen: |
Date Completed 31.01.2020 Date Revised 31.01.2020 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.bios.2019.111571 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM300550723 |
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| 520 | |a Copyright © 2019 Elsevier B.V. All rights reserved. | ||
| 520 | |a The extracellular electron transfer of Shewanella oneidensis MR-1 (MR-1) has been extensively studied due to the importance of the biosensors and energy applications of bioelectrochemical systems. However, the oxidation of metal compounds by MR-1, which represents the inward extracellular electron transfer from extracellular electron donors into the microbe, is barely understood. In this study, MR-1 immobilized on an electrode electrocatalyzes the oxidation of [Fe(CN)6]4- to [Fe(CN)6]3- efficiently and selectively. The selectivity depends on midpoint potential and overall charge(s) of redox molecules. Among 12 investigated redox molecules, the negatively charged molecules with high midpoint potentials, i.e., [Ru(CN)6]4- and [Fe(CN)6]4-, show strong electrocatalysis. Neither reference bacteria (Escherichia coli K-12 nor Streptococcus mutans) electrocatalyze the oxidation of [Fe(CN)6]4-. The electrocatalysis decays when MR-1 is covered with palladium nanoparticles presumptively involved with cytochromes c. However, cytochromes c MtrC and OmcA on MR-1 do not play an essential role in this process. The results support a model that [Fe(CN)6]4- donor electrons to MR-1 by interacting with undiscovered active sites and the electrons are subsequently transferred to the electrode through the mediating effect of [Fe(CN)6]4-/3-. The selective electron uptake by MR-1 provides valuable and fundamental insights of the applications of bioelectrochemical systems and the detection of specific redox molecules | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Bioelectrochemical systems | |
| 650 | 4 | |a Cytochromes c | |
| 650 | 4 | |a Electrocatalysis | |
| 650 | 4 | |a Extracellular electron transfer | |
| 650 | 4 | |a Ferrocyanide | |
| 650 | 4 | |a Shewanella | |
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| 700 | 1 | |a Wu, Ranran |e verfasserin |4 aut | |
| 700 | 1 | |a Mølager Christensen, Hans E |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Feng |e verfasserin |4 aut | |
| 700 | 1 | |a Zhang, Jingdong |e verfasserin |4 aut | |
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