Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.360
Publication date: 18th July 2023
Advancements in synthetic biology have pushed the frontier of materials science into the realm of engineering living materials. This presentation focuses on bioengineering strategies for coupling the electronic metabolisms of living cells with electrodes. Building on recent discoveries in the extracellular electron transfer mechanisms of S. oneidensis, our research focuses on the heterologous expression of key cytochromes in a facultative anaerobe (E. coli) [1-2]. We employ a combination of colorimetric and electrochemical techniques to characterize extracellular electron transfer in these engineered microbes. Interestingly, the bioengineered strains exhibit enhancements in both mediated and non-mediated extracellular electron transfer, with the extent varying with the specific combinations of expressed proteins. This platform was used to demonstrate enhanced electricity production for applications such as waste water treatment. Importantly, this work represents the first demonstration of the complete electron conduit from S. oneidensis fo bioeletcricity genertaion in a foreign cell. This demonstartion significantly broadens the range of exoelectrogenic microbes, unlocking new applications in microbial electronics across various fields such as biotechnology, environmental science, chemical synthesis, and energy conversion.
The authors are grateful for support from the Swiss National Science Foundation and the Gebert Ruf Stiftung.
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