Metabolic Engineering of <i>Saccharomyces cerevisiae</i> for Conversion of Formate and Acetate into Free Fatty Acids

Abstract

The ever-increasing global energy demand, juxtaposed with critical concerns about greenhouse gas emissions, emphatically underscores the urgency to pivot toward sustainable and eco-friendly energy alternatives. Tapping into microbial metabolism for clean energy generation stands out as a particularly promising avenue in this endeavor. Given this backdrop, we delved deeply into the metabolic engineering potential of Saccharomyces cerevisiae, thereby aiming for the bioconversion of formate and acetate—both CO2 derivatives—into free fatty acids (FFAs) as precursors for biofuel production. Our study not only elucidated the metabolic pathways within S. cerevisiae that are tailored for efficient formate and acetate utilization but also shone a light on the meticulous optimization strategies that amplify FFA synthesis. The engineered strains, under refined conditions, exhibited up to an 8-fold increase in an FFA titer, thus reaching a production level of 6.6 g/L, which showcases the potential of microbial metabolism in clean energy generation. Our findings offer a promising step toward harnessing microbial metabolism for sustainable energy production, thereby bridging the gap between waste carbon utilization and greener fuel alternatives.

Keywords

• free fatty acids
• <i>Saccharomyces cerevisiae</i>
• formate and acetate
• metabolic engineering
• fed-batch fermentation