This technology uses engineered Shewanella oneidensis bacteria to rapidly produce highly conductive protein nanowires for sustainable energy, bioelectronics, and sensor applications, offering a scalable, cost-effective, and eco-friendly alternative to synthetic conductive materials.
Background
The field of bioelectronics and sustainable energy harvesting is rapidly evolving, driven by the need for new materials that can efficiently convert biological or environmental energy into usable electrical power. Traditional conductive materials, such as synthetic polymers and metals, are widely used in applications ranging from wearable electronics to biosensors and microbial fuel cells. However, these materials often come with significant drawbacks, including high production costs, limited biocompatibility, and environmental concerns related to their synthesis and disposal. As the global demand for sustainable, high-performance, and environmentally friendly conductive materials grows—especially in markets like wearable computing and energy harvesting—there is an increasing need for innovative solutions that leverage biological systems for material production.
Current approaches to producing biologically derived conductive materials face several technical and practical limitations. For example, the production of protein nanowires using Geobacter sulfurreducens is hindered by the organism’s slow growth rate and the requirement for strict anaerobic conditions, which complicates large-scale manufacturing. Alternative systems, such as E. coli, lack the native secretion signals and cytochrome maturation machinery necessary for efficient post-translational processing and export of functional cytochromes, often necessitating the use of complex plasmids and multi-step purification protocols. These challenges result in low yields, lengthy production times, and increased costs, making it difficult to scale up for industrial or commercial applications. Consequently, there remains a significant unmet need for a robust, scalable, and cost-effective platform capable of producing high-quality, functional protein nanowires suitable for integration into next-generation bioelectronic devices.
Technology Description
This technology is a comprehensive biotechnology platform that leverages Shewanella oneidensis as a microbial chassis for the high-yield production of electrically conductive protein nanowires, specifically engineered variants of the OmcZ cytochrome. The system utilizes native secretion signals, such as the CctA peptide, fused to cytochrome genes to direct efficient export and maturation of the target proteins via Shewanella’s robust cytochrome processing machinery. Co-expression of processing enzymes like the OzpA protease ensures correct post-translational modification, while affinity tags facilitate straightforward purification from culture supernatants. The result is rapid, scalable, and cost-effective production of functional OmcZ nanowires, which self-assemble into nanoscale filaments with exceptional electrical conductivity. These nanowires can be integrated into a variety of advanced materials—ranging from hydrogels and biofilms to non-woven mats and bioelectromagnetic assemblies—enabling applications in energy harvesting, bioelectronics, biosensing, and environmental remediation.
What sets this technology apart is its unique combination of biological efficiency, material performance, and sustainability. Unlike traditional systems that rely on slow-growing or genetically cumbersome microbes, this platform exploits the fast growth and native secretion capabilities of Shewanella, achieving yields and processing speeds unattainable with other hosts. The engineered OmcZ nanowires exhibit electrical conductivities on par with leading synthetic polymers, yet are produced renewably and are inherently biocompatible. The system’s modular design supports rapid engineering and screening of cytochrome variants, allowing for tailored material properties and enhanced device integration. Furthermore, the platform’s scalability and low-cost production make it a compelling alternative to petrochemical-based conductive materials, positioning it at the forefront of sustainable solutions for next-generation energy and electronic technologies.
Benefits
- High-yield, rapid production of functional cytochromes using a fast-growing *Shewanella oneidensis* expression system
- Biologically produced conductive protein nanowires with electrical conductivity comparable to synthetic polymers
- Cost-effective and sustainable alternative to synthetic conductive materials through microbial fermentation
- Scalable production process enabling industrial-scale yields and easy purification from culture supernatants
- Versatile platform supporting engineered cytochrome variants with enhanced conductivity and tailored properties
- Wide range of applications including energy harvesting, wearable electronics, biosensors, and bioremediation
- Improved biocompatibility and environmental stability compared to conventional conductive polymers
- Integration of protein engineering and synthetic biology for rapid development of advanced bioelectronic materials
Commercial Applications
- Wearable bioelectronic devices
- Evaporation-based power generation
- Microbial fuel cells
- Biosensors for medical diagnostics
- Bioremediation of environmental pollutants
Additional Information
This biotechnology platform employs engineered *Shewanella oneidensis* to rapidly produce functional, non-native cytochromes. It fuses native secretion signals to target genes, leveraging the bacterium's inherent maturation and export machinery. The resulting proteins, like OmcZ, self-assemble into electrically conductive nanowires. This system enables high-yield, scalable production for sustainable energy harvesting and advanced bioelectronics, overcoming prior limitations.
Patent PCT/US2026/016230 filed 02/23/26
