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Solar-Driven Methanogenesis through Microbial Ecosystem Engineering on Carbon Nitride.

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This study enhances semi-biological photosynthesis by co-culturing Methanosarcina barkeri with Geobacter sulfurreducens. This microbial partnership boosts electron transfer for efficient carbon dioxide conversion into sustainable fuels.

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Area of Science:

  • Biotechnology
  • Microbial Ecology
  • Sustainable Chemistry

Background:

  • Semi-biological photosynthesis uses synthetic photosensitizers and microbial catalysts for sustainable fuel production from CO2.
  • Inefficient photoexcited electron transfer to microbes limits CO2 utilization and catalytic performance in biohybrid systems.

Purpose of the Study:

  • To engineer a biological solution for sluggish electron uptake in methanogens.
  • To improve the efficiency of semi-biological photosynthesis using microbial co-cultures.

Main Methods:

  • Co-culturing Methanosarcina barkeri (M. barkeri) with Geobacter sulfurreducens KN400 (KN400), an electron transport specialist.
  • Utilizing KN400's multiheme c-type cytochromes (c-Cyts) and electrically conductive protein filaments (e-PFs) for enhanced extracellular electron transfer (EET).
  • Integrating the M. barkeri-KN400 co-culture with a carbon nitride photosensitizer for photocatalysis.

Main Results:

  • KN400's c-Cyts and e-PFs efficiently transferred photoexcited electrons from carbon nitride to M. barkeri.
  • Enhanced electron uptake by M. barkeri led to improved methanogenesis from CO2.
  • The biohybrid system demonstrated remarkable long-term stability and selectivity in solar-driven chemical production.

Conclusions:

  • Co-culturing M. barkeri with KN400 provides an effective biological engineering strategy to overcome electron transfer limitations in semi-biological photosynthesis.
  • Direct interspecies electron transfer (DIET) between microbes and synthetic photosensitizers offers a novel ecosystem engineering approach for solar chemistry.
  • This work advances the development of efficient and stable biohybrid catalysts for sustainable fuel and chemical synthesis.