Microbial metabolic flexibility guarantees function resilience in response to starvation disturbance

Area of Science:

• Microbial Ecology
• Bioreactor Engineering
• Metabolic Engineering

Background:

• Nutrient limitation and starvation are common challenges in bioreactor operations.
• Understanding microbial system responses to starvation is critical for maintaining bioreactor functionality.

Purpose of the Study:

• To investigate the metabolic response mechanisms of a biofilm community to starvation.
• To elucidate how microbial systems ensure functional resilience under nutrient-limited conditions.

Main Methods:

• Utilized a gaseous toluene biofilter under controlled starvation conditions (interruption of operation).
• Analyzed metabolic characteristics before and after starvation.
• Employed metagenomic sequencing to assess microbial community changes.

Main Results:

• Significant differences in metabolic characteristics were observed post-starvation.
• Dominant carbon source utilization shifted from amino acids/carboxylic acids to esters/carbohydrates.
• Metagenomic data indicated enhanced metabolic stability and flexible energy metabolism.

Conclusions:

• Microbial metabolic adaptation is key to surviving starvation in bioreactors.
• Shifted substrate utilization and flexible metabolism contribute to functional resilience.
• Findings advance the understanding of bioreactor stability and microbial ecosystem responses to stress.