An integrated yeast‐based process for cis, cis‐muconic acid production. Issue 2 (24th November 2021)

• Record Type: Journal Article
• Authors: Wang, Guokun; Tavares, Aline; Schmitz, Simone; França, Lucas; Almeida, Hugo; Cavalheiro, João; Carolas, Ana; Øzmerih, Süleyman; Blank, Lars M.; Ferreira, Bruno S.; Borodina, Irina
• Is Part Of: Biotechnology and bioengineering. Volume 119:Issue 2(2022)
• Page Start: 376
• Page End: 387
• Publication Date: 2021-11-24
• Subjects: fermentation -- metabolic engineering -- purification -- recovery -- Saccharomyces cerevisiae; Biotechnology -- Periodicals; Bioengineering -- Periodicals; 660.6
• DOI: 10.1002/bit.27992
• Languages: English
• ISSNs: 0006-3592

Abstract

Abstract: Cis, cis‐muconic acid (CCM) is a promising polymer building block. CCM can be made by whole‐cell bioconversion of lignin hydrolysates or de novo biosynthesis from sugar feedstocks using engineered microorganisms. At present, however, there is no established process for large‐scale CCM production. In this study, we developed an integrated process for manufacturing CCM from glucose by yeast fermentation. We systematically engineered the CCM‐producing Saccharomyces cerevisiae strain by rewiring the shikimate pathway flux and enhancing phosphoenolpyruvate supply. The engineered strain ST10209 accumulated less biomass but produced 1.4 g/L CCM (70 mg CCM per g glucose) in microplate assay, 71% more than the previously engineered strain ST8943. The strain ST10209 produced 22.5 g/L CCM in a 2 L fermenter with a productivity of 0.19 g/L/h, compared to 0.14 g/L/h achieved by ST8943 in our previous report under the same fermentation conditions. The fermentation process was demonstrated at pilot scale in 10 and 50 L steel tanks. In 10 L fermenter, ST10209 produced 20.8 g/L CCM with a CCM yield of 0.1 g/g glucose and a productivity of 0.21 g/L/h, representing the highest to‐date CCM yield and productivity. We developed a CCM recovery and purification process by treating the fermentation broth with activated carbon at low pH and low temperature, achieving an overall CCM recovery yield of 66.3% and 95.4% purity. In summary, we report an integrated CCM production process employing engineered S. cerevisiae yeast. Abstract : An integrated yeast‐based process for cis, cis‐muconic acid (CCM) production was described. Wang and co‐workers reprogrammed the CCM‐producing yeast S. cerevisiae strain by increasing PEP supply and rewiring the shikimate pathway, established a CCM bioproduction process that was robust in the scale‐up, and developed the first CCM recovery and purification process for yeasts.