Renewable fatty acid ester production in Clostridium

Area of Science:

• Synthetic Biology and Metabolic Engineering
• Industrial Biotechnology
• Renewable Chemical Production

Background:

• Bioproduction of renewable chemicals is crucial for addressing the fossil energy crisis.
• Current challenges include developing microbial strains for high-level production of target biochemicals.
• Natural microbial pathways offer a foundation for improving bioproduction efficiency.

Purpose of the Study:

• To develop an efficient bioproduction process for high-value, easy-recoverable chemical derivatives.
• To engineer microbial strains capable of enhanced biosynthesis of target compounds.
• To assess the economic viability of the developed bioprocess.

Main Methods:

• Leveraged pathways in solventogenic clostridia for co-producing precursor molecules (acyl-CoAs, acids, alcohols).
• Employed rational screening for optimal host strains and enzymes.
• Conducted systematic metabolic engineering, including elimination of putative prophages.

Main Results:

• Developed engineered strains capable of producing 20.3 g/L of butyl acetate.
• Achieved production of 1.6 g/L of butyl butyrate.
• Techno-economic analysis indicated economic competitiveness of the bioprocess.

Conclusions:

• The study successfully demonstrated improved bioproduction efficiency through rational host selection and metabolic engineering.
• The developed microbial chassis efficiently produce high-value, easily separable end products.
• The principles applied may be transferable to other bioproduction processes.