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Electrical-biological hybrid system for CO2 reduction.

Yohei Tashiro1, Shinichi Hirano2, Morgan M Matson3

  • 1Center for Sustainable Resource Science, RIKEN, 1-7-22, Suehiro-cho, Tsurimi-ku, Yokohama, Kanagawa 230-0045, Japan; Department of Chemistry, University of California, One Shields Ave, Davis, CA 95616, USA.

Metabolic Engineering
|March 28, 2018
PubMed
Summary

This study introduces an electrochemical-biological system to fix carbon dioxide (CO2) using engineered Escherichia coli. The hybrid approach enhances CO2 fixation speed, enabling chemical production from electricity and CO2.

Keywords:
CO(2) fixationElectrochemical-biological hybrid systemFormate fixation

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Area of Science:

  • Synthetic Biology
  • Biotechnology
  • Electrochemistry

Background:

  • Biological carbon dioxide (CO2) fixation is often slow.
  • Enhancing CO2 fixation rates is crucial for industrial applications.
  • Electrocatalysis offers a potential method to accelerate CO2 conversion.

Purpose of the Study:

  • To develop an efficient electrochemical-biological hybrid system for CO2 fixation.
  • To engineer Escherichia coli for a novel CO2 and formate fixation pathway.
  • To demonstrate the feasibility of using electricity and CO2 as feedstocks for microbial growth and chemical production.

Main Methods:

  • Constructed a hybrid system integrating electrocatalysis and a genetically engineered metabolic pathway in Escherichia coli.
  • Reduced CO2 to formate using electrocatalysts.
  • Established a synthetic pathway converting formate and CO2 to pyruvate via glycine and L-serine.
  • Utilized E. coli's genetic tractability to optimize pathway parameters and carbon flux.

Main Results:

  • Developed a novel pathway converting two formate and one CO2 into one pyruvate.
  • Achieved sufficient carbon flux to compensate for L-serine auxotrophy in E. coli.
  • Successfully integrated electrocatalysis and biological systems in a single pot.
  • Demonstrated E. coli growth supported by CO2 and electricity.

Conclusions:

  • The developed electrochemical-biological hybrid system effectively fixes CO2 at an enhanced rate.
  • This system holds promise for sustainable chemical production using electricity and CO2.
  • The engineered E. coli strain demonstrates robust performance in the hybrid system.