Consolidated microbial production of four-, five-, and six-carbon organic acids from crop residues: Current status and perspectives
2022
Son, Jina | Joo, Jeong Chan | Baritugo, Kei-Anne | Jeong, Seona | Yi, Chi-yŏn | Lim, Hye Jin | Lim, Seo Hyun | Yoo, Jee In | Park, Si Jae
The production of platform organic acids has been heavily dependent on petroleum-based industries. However, petrochemical-based industries that cannot guarantee a virtuous cycle of carbons released during various processes are now facing obsolescence because of the depletion of finite fossil fuel reserves and associated environmental pollutions. Thus, the transition into a circular economy in terms of the carbon footprint has been evaluated with the development of efficient microbial cell factories using renewable feedstocks. Herein, the recent progress on bio-based production of organic acids with four-, five-, and six-carbon backbones, including butyric acid and 3-hydroxybutyric acid (C4), 5-aminolevulinic acid and citramalic acid (C5), and hexanoic acid (C6), is discussed. Then, the current research on the production of C4–C6 organic acids is illustrated to suggest future directions for developing crop-residue based consolidated bioprocessing of C4-C6 organic acids using host strains with tailor-made capabilities.
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