NDLI: Bioelectrical redox cycling of anthraquinone-2,6-disulfonate coupled to perchlorate reduction

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Proton-coupled electron transfer

Proton-coupled electron transfer: classification scheme and guide to theoretical methods

The role of proton coupled electron transfer in water oxidation

Electrochemical approach to proton-coupled electron transfers: recent advances

Bimolecular proton-coupled electron transfer from tryptophan with water as the proton acceptor

Proton-coupled electron transfer kinetics for the hydrogen evolution reaction of hangman porphyrins

Proton relay and electron flow in the O–O single bond formation in water oxidation by the ruthenium blue dimer

The structure and activation of substrate water molecules in the S₂ state of photosystem II studied by hyperfine sublevel correlation spectroscopy

Electrochemical hydrogen production in aqueous micellar solution by a diiron benzenedithiolate complex relevant to [FeFe] hydrogenases

Electrochemical generation of hydrogen from acetic acid using a molecular molybdenum–oxo catalyst

Using combinations of oxidants and bases as PCET reactants: thermochemical and practical considerations

Post-processing pathways in carbon capture and storage by mineral carbonation (CCSM) towards the introduction of carbon neutral materials

Top ten fundamental challenges of biomass pyrolysis for biofuels

Towards solution processed all-carbon solar cells: a perspective

Conjugated porous polymers for energy applications

Air as the renewable carbon source of the future: an overview of CO₂ capture from the atmosphere

Electrical energy storage for transportation—approaching the limits of, and going beyond, lithium-ion batteries

Pyrolytic conversion of cellulose to fuels: levoglucosan deoxygenation via elimination and cyclization within molten biomass

First implementation of alkaline polymer electrolyte water electrolysis working only with pure water

Nickel oxide functionalized silicon for efficient photo-oxidation of water

Highly stable Si-based multicomponent anodes for practical use in lithium-ion batteries

Growth of ultrathin mesoporous Co₃O₄ nanosheet arrays on Ni foam for high-performance electrochemical capacitors

Comb-shaped polymers to enhance hydroxide transport in anion exchange membranes

A tubular polypyrrole based air electrode with improved O₂ diffusivity for Li–O₂ batteries

Triple-coaxial electrospun amorphous carbon nanotubes with hollow graphitic carbon nanospheres for high-performance Li ion batteries

A cobalt(ii) quaterpyridine complex as a visible light-driven catalyst for both water oxidation and reduction

Superhydrophobic and superoleophilic properties of graphene-based sponges fabricated using a facile dip coating method

Raman spectroscopic monitoring of carbon deposition on hydrocarbon-fed solid oxide fuel cell anodes

Hierarchical TiO₂–Si nanowire architecture with photoelectrochemical activity under visible light illumination

Second-coordination-sphere and electronic effects enhance iridium(iii)-catalyzed homogeneous hydrogenation of carbon dioxide in water near ambient temperature and pressure

Improving the cycling stability of silicon nanowire anodes with conducting polymer coatings

Rechargeable Li–O₂ batteries with a covalently coupled MnCo₂O₄–graphene hybrid as an oxygen cathode catalyst

Exploration of the active center structure of nitrogen-doped graphene-based catalysts for oxygen reduction reaction

High efficiency polymer solar cells based on poly(3-hexylthiophene)/indene-C₇₀ bisadduct with solvent additive

Lithium storage in nitrogen-rich mesoporous carbon materials

Selective oxidation of complex, water-insoluble biomass to formic acid using additives as reaction accelerators

Low effective mass leading to high thermoelectric performance

Bioelectrical redox cycling of anthraquinone-2,6-disulfonate coupled to perchlorate reduction

Impact of Sr segregation on the electronic structure and oxygen reduction activity of SrTi_1−xFe_xO₃ surfaces

Crystallographically preferred oriented TiO₂ nanotube arrays for efficient photovoltaic energy conversion

Enhanced methane yields from anaerobic digestion of Arthrospira maxima biomass in an advanced flow-through reactor with an integrated recirculation loop microbial fuel cell

Low-cost and large-scale synthesis of alkaline earth metal germanate nanowires as a new class of lithium ion battery anode material

Design criteria for electrochemical shock resistant battery electrodes

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Bioelectrical redox cycling of anthraquinone-2,6-disulfonate coupled to perchlorate reduction

Content Provider	Royal Society of Chemistry (RSC)
Author	Coates, John D. Clark, Iain C. Carlson, Hans K. Iavarone, Anthony T.
Copyright Year	2012
Abstract	Electrochemical reactors can be used to deliver electrons to bacteria with soluble, redox-active shuttles, and this has been proposed for both biosynthetic and bioremediation purposes. In the case of perchlorate reduction in bioelectrical reactors, very little is known about the mechanism of shuttle oxidation, although this understanding is important for treatment system design and scaleup. In this work, electrochemical, physiological, and proteomic experiments were performed to investigate anthrahydroquinone-2,6-disulfonate (AH2DS) oxidation by Azospira suillum PS under perchlorate reducing conditions. In inoculated bioelectrical reactors with AH2DS as the sole electron donor, only small amounts of cathodic current were observed. However, acetate addition resulted in a rapid increase in cathodic current, concomitant with acetate oxidation. This effect was not seen with nitrate as the terminal electron acceptor or when cells were lysed. We hypothesized that co-utilization of electron donors was a result of normal organotrophic perchlorate reduction, in addition to non-enzymatic reactions between AH2DS and intermediates (chlorite, oxygen) of the pathway. These reactions are expected to result in the production of reactive oxygen species (ROS) and toxicity, which was confirmed in batch growth experiments. Shotgun proteomics revealed significantly increased tandem spectral peptide counts of a diheme c-type cytochrome peroxidase; again, only when perchlorate, acetate, and AH2DS were present. Homologs of this protein relieve oxidative stress by reducing hydrogen peroxide to water. This work highlights the fact that oxidation of inorganic electron donors can occur non-enzymatically, as well as the challenge of targeting a specific metabolism with chemical shuttles that are highly reactive.
Starting Page	7970
Ending Page	7978
Page Count	9
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	5
Issue Number	7
Journal	Energy & Environmental Science
DOI	10.1039/c2ee21594b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Bacteria Bioremediation Perchlorate Electrochemistry Azospira Redox Partial current Nitrate Electron acceptor Organotroph Chlorite Oxygen Reactive oxygen species Shotgun proteomics Peptide Peroxidase Protein Oxidative stress Hydrogen peroxide Metabolism
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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Bioelectrical redox cycling of anthraquinone-2 , 6-disulfonate coupled to perchlorate reduction †

Physiology and Biotechnological Applications of Microbial (Per)chlorate Reduction

Preferential Use of the Perchlorate over the Nitrate in the Respiratory Processes Mediated by the Bacterium Azospira sp. OGA24

A novel perchlorate- and nitrate-reducing bacterium, Azospira sp. PMJ

Biocatalytic perchlorate reduction: kinetics and effects of groundwater characteristics

Genetics and Genomics of Perchlorate Reduction and Reactive Chlorine Species

Environmental biotechnology description of the novel perchlorate-reducing bacteria.

Functional Redundancy in Perchlorate and Nitrate Electron Transport Chains and Rewiring Respiratory Pathways to Alter Terminal Electron Acceptor Preference

Kinetics of chlorite dismutase in a perchlorate degrading reactor sludge

Bioelectrical redox cycling of anthraquinone-2,6-disulfonate coupled to perchlorate reduction

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Bioelectrical redox cycling of anthraquinone-2 , 6-disulfonate coupled to perchlorate reduction †

Physiology and Biotechnological Applications of Microbial (Per)chlorate Reduction

Preferential Use of the Perchlorate over the Nitrate in the Respiratory Processes Mediated by the Bacterium Azospira sp. OGA24

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Bioelectrical redox cycling of anthraquinone-2,6-disulfonate coupled to perchlorate reduction