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Electron Transport Chains

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Related Experiment Video

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Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
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Flavin mononucleotide mediated electron pathway for microbial U(VI) reduction.

Yoshinori Suzuki1, Yoshihiro Kitatsuji, Toshihiko Ohnuki

  • 1School of Bioscience and Biotechnology, Tokyo University of Technology, Katakura, Hachioji, Tokyo 192-0982, Japan. yosuzuki@bs.teu.ac.jp

Physical Chemistry Chemical Physics : PCCP
|July 13, 2010
PubMed
Summary

Flavin mononucleotide (FMN) acts as an electron shuttle, mediating the microbial reduction of uranium (U(VI)) to U(IV). This FMN-mediated process accelerates uranium biogeoreduction by Shewanella species, impacting subsurface uranium mobility.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Electrochemistry

Background:

  • Microbial reduction of Uranium (U(VI)) influences uranium's mobility in subsurface environments.
  • Understanding the mechanisms of U(VI) reduction is crucial for predicting uranium migration and developing remediation strategies.

Purpose of the Study:

  • To investigate the electron transfer pathway for U(VI) reduction mediated by flavin mononucleotide (FMN).
  • To elucidate the role of FMN secreted by Shewanella species in the biogeoreduction of uranium.

Main Methods:

  • Cyclic voltammetry (CV) was used to study electron transfer between FMN and U(VI) in buffer solutions.
  • Photo-electrochemical methods with an optically transparent thin-layer electrode (OTTLE) cell were employed for in vitro analysis.
  • In vivo bio-reduction experiments using Shewanella putrefaciens were conducted.

Main Results:

  • CV measurements showed a catalytic U(VI) reduction current in the presence of FMN at its redox potential, absent without FMN.
  • The reduction current of U(VI) increased with higher U(VI) concentrations.
  • Photo-electrochemical analysis confirmed FMN mediates the electro-reduction of U(VI) to U(IV).
  • In vivo experiments demonstrated that FMN addition accelerated the U(VI) bio-reduction rate by Shewanella putrefaciens.

Conclusions:

  • Flavin mononucleotide (FMN) acts as a crucial electron mediator in the electro-reduction of U(VI) to U(IV).
  • Secreted FMN by Shewanella species can catalyze the bio-reduction of U(VI), enhancing uranium remediation potential.