Abstract
4-Hydroxyvaleric acid (4-HV) holds promise as a sustainable monomer for biodegradable polyesters and liquid transportation fuels. This study achieved high-level 4-HV production from levulinic acid using an antibiotic-free, substrate-inducible system in Escherichia coli. Enzymes involved in the conversion of levulinic acid to 4-HV were expressed with a bicistronic design of ribosome binding sites. The engineered strain demonstrated a 28% higher productivity compared to its counterpart, reaching a significant concentration of 107 g/L 4-HV with a production rate of 4.5 g/L/h and a molar conversion of 95% from levulinic acid in fed-batch cultivation. Recombinant cells from the initial cultivation were reused for a second round of biotransformation, demonstrating 73% efficiency of fresh cells. The study identified specific factors contributing to decreased system efficiency, including medium conditions, increased ionic strength, and high product concentration. Overall, the reported system and our findings hold significant potential for cost-effective microbial production of 4-HV at scale from levulinic acid.
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Acknowledgements
We would like to acknowledge the financial support from the Basic Science Research Program, funded by the Ministry of Science, ICT and Future Planning (MSIT) through the National Research Foundation of Korea (NRF) (Grant No. NRF RS-2023-00208026). We are also grateful to the Circle Foundation for their support through the 2020 Innovative Science Project.
Funding
1. National Research Foundation of Korea (NRF) (Grant No. NRF RS-2023-00208026). 2. Innovative science project in 2020 of the Circle Foundation.
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C.S-P. conceived and designed the experiments, conducted all procedures, acquired and processed data, and drafted the initial manuscript. R.T. contributed to data processing and provided review. S.K.L. conceptualized and designed the study, validated the data, and critically revised the manuscript. All authors thoroughly reviewed and approved the manuscript's content.
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Sathesh-Prabu, C., Tiwari, R. & Lee, S.K. Enhancing translation efficiency and exploring constraints in high-level 4-hydroxyvaleric acid production from levulinic acid in Escherichia coli. Syst Microbiol and Biomanuf (2024). https://doi.org/10.1007/s43393-024-00258-8
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DOI: https://doi.org/10.1007/s43393-024-00258-8