System-level characterization of engineered and evolved formatotrophic E. coli strains.

Area of Science:

• Synthetic Biology
• Metabolic Engineering
• Microbial Biotechnology

Background:

• One-carbon compounds like formate are sustainable feedstocks for microbial bioproduction.
• Escherichia coli engineered with the reductive glycine pathway (rGlyP) can grow on formate.
• Previous adaptive laboratory evolution improved growth but not to theoretical optimal yields.

Purpose of the Study:

• To investigate suboptimal biomass yields in formatotrophic E. coli strains.
• To identify metabolic bottlenecks limiting growth on formate.
• To provide insights for improving formatotrophic strain performance.

Main Methods:

• Metabolic modeling was employed to analyze metabolic fluxes.
• Genomic and proteomic analyses were conducted to identify genetic and protein changes.
• Systems-level analysis integrated multi-omics data.

Main Results:

• Several metabolic bottlenecks limiting biomass yield were identified.
• Evolutionary mutations and proteome allocation changes were revealed.
• These factors contributed to improved, yet sub-optimal, growth rates and yields.

Conclusions:

• Understanding these bottlenecks is crucial for optimizing formatotrophic E. coli.
• This study provides key insights for developing high-yield, fast-growing strains.
• The findings advance microbial bioproduction using sustainable C1 feedstocks.