Light-driven synthetic microbial consortia: playing with an oxygen dilemma

Area of Science:

• Synthetic biology
• Microbial ecology
• Biotechnology

Background:

• Light-driven synthetic microbial consortia combine photoautotrophs and heterotrophs.
• These consortia demonstrate superior stability, robustness, and task handling compared to axenic cultures.
• Oxygen evolution from photosynthesis is a critical factor influencing consortium function.

Purpose of the Study:

• To investigate the dual role of oxygen produced by photoautotrophs in light-driven microbial consortia.
• To explore strategies for managing oxygen to optimize consortium performance in various applications.
• To enable cost-effective chemical production from CO2 and light using these consortia.

Main Methods:

• Comparative analysis of microbial consortia performance.
• Investigation of oxygen's impact on different metabolic processes.
• Development of approaches to mitigate oxygen's negative effects.

Main Results:

• Oxygen benefits aerobic processes like wastewater treatment and chemical production by enabling efficient respiration.
• Oxygen inhibits anaerobic processes such as biohydrogen and bioelectricity generation by deactivating components and competing for electrons.
• The oxygen produced by photoautotrophs presents a significant challenge for anaerobic applications.

Conclusions:

• Light-driven synthetic microbial consortia offer a promising avenue for sustainable chemical production.
• Managing the oxygen dilemma is crucial for expanding the applications of these consortia.
• Developing versatile strategies to control oxygen levels is essential for practical implementation.