Energetic constraints of metal-reducing bacteria as biocatalysts for microbial electrosynthesis.
AI summary
75% confidenceThe study investigates the energetic constraints of quinone-pool-dependent electron uptake (Q-pool-dependent EEU) in metal-reducing bacteria used for microbial electrosynthesis (MES). Results indicate that this specific electron uptake mechanism is dependent on and limited by intracellular membrane potential (IMF), creating a thermodynamic bottleneck. Consequently, future MES platform designs must account for these limitations when selecting genetically tractable and metabolically flexible bacterial strains.
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Abstract
Our results suggest that Q-pool-dependent EEU is both IMF-dependent and is IMF-limited in a proof-of-concept system. Because microbes that rely on Q-pool-dependent EEU are among the most genetically tractable and metabolically flexible options for MES systems, it is important that we account for this thermodynamic bottleneck in future MES platform designs.
Key findings
- Q-pool-dependent EEU is strictly dependent on the intracellular membrane potential (IMF).
- The rate of Q-pool-dependent EEU is limited by the magnitude of the IMF in proof-of-concept systems.
- Ignoring this thermodynamic bottleneck could hinder the performance of future MES platforms utilizing these bacteria.