Mediated Electron Transfer
Mediated Electron Transfer - Related Videos
02:48
Ionic Bonding and Electron Transfer
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2020
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. Properties of Ionic...
10:23
Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
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Cited by 4 •
2024
Here we present a protocol for characterizing mediated extracellular electron transfer (EET) in lactic acid bacteria using a three-electrode, two-chamber bioelectrochemical system. We illustrate this method with Lactiplantibacillus plantarum and the redox mediator 1,4-dihydroxy-2-naphthoic acid and provide a thorough description of the electrochemical techniques used to evaluate mediated EET.
10:44
Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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2025
Here, we present a protocol for using organic electrochemical transistors (OECTs) to translate extracellular electron transfer (EET) activity in Shewanella oneidensis into electrical signals. The hybrid OECT system provides enhanced robustness, sensitivity, and potential for rapid, high-throughput testing, making it an effective tool for EET measurements.
06:56
Detection of Horizontal Gene Transfer Mediated by Natural Conjugative Plasmids in E. coli
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Cited by 5 •
2023
Conjugation mediates horizontal gene transfer by mobilizing plasmid DNA across two different cells, facilitating the spread of beneficial genes. This work describes a widely-used method for the efficient detection of conjugative plasmid transfer, based on the use of differential markers in the conjugative plasmid, donor, and recipient to detect transconjugation.
01:24
Electron Carriers
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2019
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons. Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
FAQs
The relative redox potentials of the donor, mediator, and acceptor influence the direction and feasibility of electron movement. A mediator must participate in complementary oxidation and reduction steps, allowing it to receive electrons from one partner and deliver them to another. Evaluating these potentials helps explain whether the desired pathway is thermodynamically compatible and supports rational coupling of biochemical reactions.
The mediator alternates between oxidized and reduced states. It is reduced when it accepts electrons from a donor, then oxidized when it transfers those electrons to an acceptor, or it follows the complementary sequence in the opposite direction. Repeated cycling allows one mediator system to connect otherwise poorly communicating redox partners without being consumed in each individual transfer.
Redox potentials indicate whether electron transfer is favorable, but reaction kinetics determine how rapidly the individual steps occur. Slow mediator reactions can limit the overall process even when the potential relationships are suitable. Examining both factors helps distinguish thermodynamic compatibility from practical transfer performance, which is important when coupling enzymes or proteins to an electrode.
Direct electron transfer requires the donor and acceptor to exchange electrons efficiently through their own interaction. The mediated approach adds an intervening redox component that performs sequential electron-transfer reactions. This distinction is useful in biochemistry because enzymes and proteins may not exchange electrons efficiently with an electrode or another acceptor without an intermediate shuttle.
A typical investigation follows the mediator through its complementary redox steps: first, one reaction partner changes the mediator's oxidation state; next, the mediator reacts with the second partner; finally, the resulting electron flow is assessed through the chosen acceptor or electrode. Researchers then interpret the behavior using redox potentials and reaction kinetics to characterize the coupled process.
It is useful when an enzyme or protein cannot exchange electrons efficiently with an electrode on its own. By linking the biological component to the electrode through a soluble or immobilized mediator, the system can couple biochemical redox activity to an electrochemical readout. This supports biosensor design, bioelectrochemical analysis, and investigation of enzyme behavior.
Mediated electron transfer provides a way to connect enzyme or protein redox reactions with an electrode or another electron acceptor. Researchers can examine how those components participate in electron-transfer processes while considering potential and kinetic constraints. The same coupling principle helps investigate cellular redox pathways, where sequential reactions move electrons between biochemical partners that may not interact efficiently in isolation.