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Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
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Related Experiment Video

Updated: Sep 1, 2025

Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
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Published on: August 23, 2024

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Microbiomics for enhancing electron transfer in an electrochemical system.

Ayush Singha Roy1, Aparna Sharma2, Bhim Sen Thapa3

  • 1Amity Institute of Biotechnology, Amity University, Mumbai, Maharashtra, India.

Frontiers in Microbiology
|August 15, 2022
PubMed
Summary

Microbial electrochemical systems harness microorganisms to convert chemical energy into electricity. This review explores electron transfer mechanisms and genetic strategies to enhance microbial electrocatalysis for diverse applications.

Keywords:
biofilmelectroactive bacteriagenetic engineeringmicrobial electrochemistryquorum sensingsynthetic biology

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Area of Science:

  • Microbial electrochemistry and bioelectrochemical systems.
  • Biocatalysis and extracellular electron transfer (EET).
  • Environmental biotechnology and biosensor development.

Background:

  • Microbial electrochemical systems (MES) utilize microorganisms to transform chemical energy into electrical energy.
  • This field has seen significant growth due to diverse applications in environmental remediation, energy generation, and biosensing.
  • Electroactive bacteria interact with electrodes via biofilm formation and other mechanisms for electron exchange.

Purpose of the Study:

  • To review the diverse mechanisms of electron exchange in microbiome-induced electron transfer.
  • To highlight proteins and secretory molecules crucial for extracellular electron transfer (EET).
  • To discuss proteomics and genetic engineering strategies for enhancing EET in electroactive bacteria.

Main Methods:

  • Literature review of existing research on microbial electrochemistry and electron transfer mechanisms.
  • Analysis of studies employing proteomics and genetics to understand and improve EET.
  • Examination of advancements in synthetic biology and genetic engineering for EET enhancement.

Main Results:

  • Multiple mechanisms facilitate electron exchange, including biofilm formation, flavins, cytochromes, and cell surface appendages.
  • Proteins and secreted molecules play vital roles in mediating electron transfer between bacteria and electrodes.
  • Proteomics and genetic strategies have shown promise in boosting EET efficiency.

Conclusions:

  • Understanding diverse EET mechanisms is key to optimizing microbial electrochemical systems.
  • Genetic engineering and synthetic biology offer powerful tools to enhance microbial electrocatalytic performance.
  • Further research into EET pathways will drive innovation in sustainable energy and environmental technologies.