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Re-assessing viologens for modern bio-electrocatalysis.

Desmond Ato Koomson1, Jake H Nicholson1, Alex P S Brogan1

  • 1Department of Chemistry, King's College London Britannia House London SE1 1DB UK alex.brogan@kcl.ac.uk leigh.aldous@kcl.ac.uk.

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Summary

Viologens act as efficient electron transfer mediators for bio-electrocatalysis, enabling cofactor-free enzymatic reactions. Their reduction potential and solubility are key for optimizing electron transfer in these redox processes.

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Area of Science:

  • Biochemistry
  • Electrochemistry
  • Organic Chemistry

Background:

  • Viologens are organic redox species, 1,1'-disubstituted-4,4'-bipyridinium salts.
  • They can serve as alternatives to NADPH, acting as mediators for redox enzymes.
  • Bio-electrocatalysis utilizes enzymes for catalytic reactions driven by electrochemical processes.

Purpose of the Study:

  • To explore a library of viologens as electron transfer mediators for bio-electrocatalysis.
  • To investigate the relationship between viologen properties and electron transfer efficiency with enzymes.
  • To demonstrate efficient cofactor-free enzymatic catalysis using optimized viologen mediators.

Main Methods:

  • Electrochemical investigations to determine reduction potentials and electron transfer characteristics.
  • Design and synthesis of a viologen library with varied polarities and functional groups.
  • Utilizing the reduction of oxidized glutathione by glutathione reductase as a model system.

Main Results:

  • Reduction potential was identified as the primary factor governing electron transfer between viologens and enzymes.
  • Enhanced solubility of reduced viologens broadened the usable potential window.
  • Achieved highly efficient electron transfer to a flavoenzyme, enabling catalysis without cofactors.

Conclusions:

  • Viologens are versatile mediators for electrochemically-driven enzymatic processes.
  • Tuning viologen solubility and reduction potential optimizes their performance.
  • This work provides a foundation for expanding the use of viologens in bio-electrocatalysis.