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Published on: October 6, 2019
Expression and Engineering of Conductive Cytochrome Nanowires
Eric R Szmuc1, Xiaomeng Liu2,3, Marcel Lopez Reed4
1Department of Molecular Biosciences, University of Texas at Austin, TX, US.
Biorxiv : the Preprint Server for Biology
|August 1, 2026
Summary
Researchers engineered protein nanowires for sustainable electronics. They developed a new production method and created enhanced conductivity variants, paving the way for advanced biological electronic materials.
Area of Science:
- Biotechnology
- Materials Science
- Microbiology
Background:
- Electrically conductive protein nanowires from bacteria are promising sustainable electronic materials.
- Challenges in expression, purification, and genetic manipulation have hindered their study and engineering.
Purpose of the Study:
- To establish a heterologous host and in vitro assembly strategy for producing and engineering Geobacter sulfurreducens OmcZ nanowires.
- To enhance the conductivity and understand the structural organization of OmcZ nanowires.
Main Methods:
- Utilized Shewanella oneidensis as a heterologous host for OmcZ nanowire production.
- Developed an in vitro assembly strategy for high-purity nanowire preparations.
- Employed systematic protein engineering and cryo-electron microscopy for structural and functional analysis.
Main Results:
- Achieved efficient production and purification of OmcZ nanowires.
- Engineered a chimeric nanowire (OmcZ+) with a ~3.5-fold increase in bulk conductivity.
- Observed novel nanowire architectures and identified key structural elements for conductivity.
- Demonstrated high power generation in devices using engineered nanowires in various saline environments.
Conclusions:
- Established a versatile platform for producing, analyzing, and engineering cytochrome nanowires.
- Demonstrated the potential of engineered OmcZ variants for high-performance biological electronic devices.
- Provided a foundation for developing programmable biological electronic materials.
