Recent progress in metabolic engineering of microbial formate assimilation

Area of Science:

• Biotechnology
• Synthetic Biology
• Metabolic Engineering

Background:

• Formate is a versatile C1 compound producible from CO2 via electrochemical or photochemical methods.
• Microbial assimilation of formate as a sole carbon source offers a sustainable route to high-value chemicals.
• Efficient formate utilization pathways are key to leveraging renewable one-carbon feedstocks.

Purpose of the Study:

• To summarize formate synthesis methods and natural microbial formate utilization pathways.
• To review advances in engineering microbial formate assimilation using metabolic engineering and synthetic biology.
• To present the rational design and experimental validation of novel formate utilization pathways.

Main Methods:

• Literature review of formate synthesis and microbial utilization pathways.
• Analysis of natural formate assimilation pathways, including their pros and cons.
• Application of the comb-FBA algorithm for designing new C1 utilization pathways.
• In vitro experimental validation of the designed GAA pathway.

Main Results:

• The GAA pathway, designed using comb-FBA, achieved a high carbon molar yield of 88% in vitro.
• Natural and engineered pathways for formate assimilation were comprehensively reviewed.
• Progress in utilizing C1 compounds across various microbial hosts and methodologies was discussed.

Conclusions:

• Engineered microbial pathways significantly enhance formate assimilation efficiency.
• Rational pathway design tools like comb-FBA are effective for creating novel C1 metabolic routes.
• Challenges remain in pathway optimization and strain development for industrial formate bioproduction.