A team of researchers led by Rice University bioscientist Caroline Ajo-Franklin has uncovered how certain bacteria generate electricity by expelling electrons into their surroundings, a process that replaces traditional oxygen-based respiration. Published in Cell, this discovery could pave the way for innovations in clean energy and industrial biotechnology, offering new tools for sustainable technology.
The study reveals that bacteria use naturally occurring compounds called naphthoquinones to transfer electrons externally, a process known as extracellular respiration. This mechanism allows bacteria to thrive in oxygen-deprived environments like deep-sea vents or the human gut. The researchers compared the process to how batteries discharge electric current, highlighting its efficiency and simplicity.
Using advanced computer modeling and laboratory tests, the team confirmed that bacteria could sustain growth by “breathing” through conductive surfaces. This interdisciplinary approach, combining biology and electrochemistry, provides a real-time method to monitor and influence bacterial behavior electronically.
“Our research not only solves a long-standing scientific mystery but also points to a new and potentially widespread survival strategy in nature,” said Ajo-Franklin, emphasizing the broader implications of the findings.
Biki Bapi Kundu, the study’s first author, added, “Naphthoquinones act like molecular couriers, carrying electrons out of the cell so the bacteria can break down food and generate energy.”
The discovery opens doors to practical applications, such as improving wastewater treatment and biomanufacturing by managing electron imbalances more effectively. Additionally, these bacteria could be harnessed for bioelectronic sensors in extreme environments, from medical diagnostics to deep-space exploration.
“It opens the door to building smarter, more sustainable technologies with biology at the core,” Ajo-Franklin noted, suggesting potential parallels to photosynthesis in renewable energy systems.
This groundbreaking research not only deepens our understanding of bacterial metabolism but also offers a foundation for future technologies that leverage nature’s ingenuity. By harnessing the unique capabilities of electricity-generating bacteria, scientists may unlock innovative solutions for clean energy and beyond.
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